Journal articles: 'Prosthesis simulator'

1

Copeland, Christopher, Mukul Mukherjee, Yingying Wang, Kaitlin Fraser, and Jorge M. Zuniga. "Changes in Sensorimotor Cortical Activation in Children Using Prostheses and Prosthetic Simulators." Brain Sciences 11, no. 8 (July 27, 2021): 991. http://dx.doi.org/10.3390/brainsci11080991.

Full text

Abstract:

This study aimed to examine the neural responses of children using prostheses and prosthetic simulators to better elucidate the emulation abilities of the simulators. We utilized functional near-infrared spectroscopy (fNIRS) to evaluate the neural response in five children with a congenital upper limb reduction (ULR) using a body-powered prosthesis to complete a 60 s gross motor dexterity task. The ULR group was matched with five typically developing children (TD) using their non-preferred hand and a prosthetic simulator on the same hand. The ULR group had lower activation within the primary motor cortex (M1) and supplementary motor area (SMA) compared to the TD group, but nonsignificant differences in the primary somatosensory area (S1). Compared to using their non-preferred hand, the TD group exhibited significantly higher action in S1 when using the simulator, but nonsignificant differences in M1 and SMA. The non-significant differences in S1 activation between groups and the increased activation evoked by the simulator’s use may suggest rapid changes in feedback prioritization during tool use. We suggest that prosthetic simulators may elicit increased reliance on proprioceptive and tactile feedback during motor tasks. This knowledge may help to develop future prosthesis rehabilitative training or the improvement of tool-based skills.

APA, Harvard, Vancouver, ISO, and other styles

2

Joyce, T. J., and A. Unsworth. "NeuFlex metacarpophalangeal prostheses tested in vitro." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 219, no. 2 (February 1, 2005): 105–10. http://dx.doi.org/10.1243/095441105x9192.

Full text

Abstract:

This paper describes the testing of three single-piece silicone NeuFlex metacarpophalan-geal prostheses in a finger function simulator and describes the resulting modes of prosthesis failure. In all cases, failure was due to imminent fracture of the prosthesis across the pivot of the central hinge section. This result is in contrast with previous in-vitro and in-vivo experience with single-piece silicone Swanson and Sutter metacarpophalangeal prostheses, which both tend to fracture at the junction of the distal stem and the hinge. In comparison with earlier in-vitro simulator tests of the Sutter metacarpophalangeal prosthesis, the NeuFlex prostheses showed a greater longevity before fracture. To date, no other reports of fracture of the NeuFlex metacarpophalangeal prosthesis have been reported, either in vitro or in vivo.

APA, Harvard, Vancouver, ISO, and other styles

3

Ayub, Rafi, Dario Villarreal, Robert D. Gregg, and Fan Gao. "Evaluation of transradial body-powered prostheses using a robotic simulator." Prosthetics and Orthotics International 41, no. 2 (July 28, 2016): 194–200. http://dx.doi.org/10.1177/0309364616650077.

Full text

Abstract:

Background: Transradial body-powered prostheses are extensively used by upper-limb amputees. This prosthesis requires large muscle forces and great concentration by the patient, often leading to discomfort, muscle fatigue, and skin breakdown, limiting the capacity of the amputee to conduct daily activities. Since body-powered prostheses are commonplace, understanding their optimal operation to mitigate these drawbacks would be clinically meaningful. Objectives: To find the optimal operation of the prosthesis where the activation force is minimized and the grip force is maximized. Study design: Experimental design. Methods: A computer-controlled robotic amputee simulator capable of rapidly testing multiple elbow, shoulder, and scapular combinations of the residual human arm was constructed. It was fitted with a transradial prosthesis and used to systematically test multiple configurations. Results: We found that increased shoulder flexion, scapular abduction, elbow extension, and the placement of the ring harness near the vertebra C7 correlate with higher gripper operation efficiency, defined as the ratio of grip force to cable tension. Conclusion: We conclude that force transmission efficiency is closely related to body posture configuration. These results could help guide practitioners in clinical practice as well as motivate future studies in optimizing the operation of a body-powered prosthesis. Clinical relevance The results from this study suggest that clinicians ought to place the ring harness inferior and to the sound side of the vertebra prominens in order to maximize grip efficiency. The results will also help clinicians better instruct patients in body posture during prosthesis operation to minimize strain.

APA, Harvard, Vancouver, ISO, and other styles

4

Qin, Wenlong, Ming Cong, Dong Liu, and Xiang Ren. "A robotic chewing simulator supplying six-axis mandibular motion, high occlusal force, and a saliva environment for denture tests." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 235, no. 7 (March 24, 2021): 751–61. http://dx.doi.org/10.1177/09544119211005601.

Full text

Abstract:

Six-axis motion is essential for the evaluation of the wear failure modes of dental prostheses with complete teeth morphologies, and a high occlusal force capacity is vital for static clenching and dynamic bruxism. Additionally, the saliva environment influences abrasive particles and crack growth. The present research was aimed at the development of a six-axis masticatory and saliva simulator with these capacities. The masticatory simulator was designed based on a six-axis parallel mechanism, and the saliva simulator consisted of a saliva circuit and a temperature control loop. A control system of the masticatory and saliva simulators was constructed. The operating interface includes a centric occlusal position search, a static test, a dynamic test, a saliva supply, and data reporting. The motion and force performances of the masticatory simulator were evaluated. The flow rate and temperature change of the saliva simulator were calculated. For the occlusal position-searching, the driving amplitude is linear with the moving variables during minor one-axis motion. For the static tests, the force capacity of the driving chain is 3540 N, while for the dynamic tests, the force capacity is 1390 N. The flow rate of the saliva is 0.18–51.84 mL/min, and the saliva can effectively wet the prosthesis without the risk of overflow. Moreover, the saliva temperature can increase from room temperature (23°C) to body temperature (37°C) in about 6 min. The proposed DUT-2 simulator with six-axis motion, high force, and a salvia environment provides an in vitro testing approach to validate numerical simulation results and explain the clinical failure modes of prostheses. The centric occlusal position-searching, static tests, and dynamic tests could therefore be executed using a single testing machine. Moreover, the proposed device is more compact than previously reported six-axis masticatory simulators, including the Bristol simulator and DUT-1 simulator.

APA, Harvard, Vancouver, ISO, and other styles

5

Wentink, Eva C., Eline J. Talsma-Kerkdijk, Hans S. Rietman, and Peter Veltink. "Feasibility of error-based electrotactile and auditive feedback in prosthetic walking." Prosthetics and Orthotics International 39, no. 3 (February 11, 2014): 255–59. http://dx.doi.org/10.1177/0309364613520319.

Full text

Abstract:

Background and aim: Several studies have shown that feedback in upper-leg prostheses is possible, but slow or difficult to interpret. In this study, electrotactile and auditive error-based feedback, only giving feedback when an undesired event occurs, were tested for its use in upper-leg prosthesis when provided during a perturbation. Technique: A total of nine healthy subjects walked on a prosthetic simulator which was disturbed at the end of the swing phase. They received either no feedback, electrotactile feedback, or auditive feedback at the time of the perturbation. Discussion: The reaction time of the subjects only improved by 40 ms when using auditory feedback, compared to the no-feedback condition. No changes in reaction time were found in the electrotactile feedback condition. Considering perturbation detection was not taken into account in this study, this improvement is not enough for practical applications in upper-leg prosthesis. Clinical relevance Many transfemoral amputees are insecure about their prosthesis, are afraid of falling, or actually fall. Providing feedback specifically during a perturbation may prevent them from falling, or at least give them a chance to react.

APA, Harvard, Vancouver, ISO, and other styles

6

McGrath, Michael Paul, Jianliang Gao, Jinghua Tang, Piotr Laszczak, Liudi Jiang, Dan Bader, David Moser, and Saeed Zahedi. "Development of a residuum/socket interface simulator for lower limb prosthetics." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 231, no. 3 (February 6, 2017): 235–42. http://dx.doi.org/10.1177/0954411917690764.

Full text

Abstract:

Mechanical coupling at the interface between lower limb residua and prosthetic sockets plays an important role in assessing socket fitting and tissue health. However, most research lab–based lower limb prosthetic simulators to-date have implemented a rigid socket coupling. This study describes the fabrication and implementation of a lower limb residuum/socket interface simulator, designed to reproduce the forces and moments present during the key loading phases of amputee walking. An artificial residuum made with model bones encased in silicone was used, mimicking the compliant mechanical loading of a real residuum/socket interface. A 6-degree-of-freedom load cell measured the overall kinetics, having previously been incorporated into an amputee’s prosthesis to collect reference data. The developed simulator was compared to a setup where a rigid pylon replaced the artificial residuum. A maximum uniaxial load of 850 N was applied, comparable to the peak vertical ground reaction force component during amputee walking. Load cell outputs from both pylon and residuum setups were compared. During weight acceptance, when including the artificial residuum, compression decreased by 10%, while during push off, sagittal bending and anterior–posterior shear showed a 25% increase and 34% decrease, respectively. Such notable difference by including a compliant residuum further highlighted the need for such an interface simulator. Subsequently, the simulator was adjusted to produce key load cell outputs briefly aligning with those from amputee walking. Force sensing resistors were deployed at load bearing anatomic locations on the residuum/socket interface to measure pressures and were compared to those cited in the literature for similar locations. The development of such a novel simulator provides an objective adjunct, using commonly available mechanical test machines. It could potentially be used to provide further insight into socket design, fit and the complex load transfer mechanics at the residuum/socket interface, as well as to evaluate the structural performance of prostheses.

APA, Harvard, Vancouver, ISO, and other styles

7

Joyce, T. J., and A. Unsworth. "The design of a finger wear simulator and preliminary results." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 214, no. 5 (May 1, 2000): 519–26. http://dx.doi.org/10.1243/0954411001535552.

Full text

Abstract:

A dual-cycle finger wear simulator has been designed, manufactured and commissioned. The simulator interspersed dynamic flexion-extension motion under light load with a heavier static ‘pinch’ load to a test prosthesis immersed in a lubricant heated to 37°C. A validation test was undertaken on a size 2 Swanson prosthesis, leading to prosthesis failure in less than 1 million cycles. A second test was carried out on a Durham metacarpophalangeal prosthesis. After 4.8 million cycles a total wear factor for the joint of 0.60 × 10−6 mm3/N m was calculated, with no cracks or damage visible. Both test results compare well with earlier tests undertaken on the Stokoe finger wear simulator.

APA, Harvard, Vancouver, ISO, and other styles

8

Prabhakar, Prashanth P., Qingshan Chen, Fredrick Schultz, Jean Yves Lazennec, and Kai-Nan An. "AUTOMATED RANGE-OF-MOTION DEVICE FOR TOTAL HIP ARTHROPLASTY PROSTHESIS." Journal of Musculoskeletal Research 10, no. 03 (September 2006): 151–55. http://dx.doi.org/10.1142/s0218957706001790.

Full text

Abstract:

Hip simulators are regularly used by researchers to assess total hip arthroplasty (THA) implants, range of motion, stability, and alignment of acetabular cup and stem. Previous papers have described three types of simulators: three-dimensional protractors, biaxial rocking motion (BRM) protractors, and single-axis prosthetic range-of-motion (PROM) devices. We have developed a new hip simulator in which the ROM device is completely automated in three independent axes (elevation, internal/external rotation, and plane of elevation). Coupled with the simulator, we used a FaroArm Gold Series coordinate measuring machine (CMM) to accurately align the implant components. The results show that the methodology and alignment setup are accurate and repeatable. With this simulator and digitizer, we are able to study the characteristics of numerous THA implants at various orientations of the pelvis, acetabular cup, stem, and femur.

APA, Harvard, Vancouver, ISO, and other styles

9

Weber, Patrick, Christian Schröder, Jens Schwiesau, Sandra Utzschneider, Arnd Steinbrück, Matthias F. Pietschmann, Volkmar Jansson, and Peter E. Müller. "Increase in the Tibial Slope Reduces Wear after Medial Unicompartmental Fixed-Bearing Arthroplasty of the Knee." BioMed Research International 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/736826.

Full text

Abstract:

Introduction. Unicompartmental arthroplasty of the knee in patients with isolated medial osteoarthritis gives good results, but survival is inferior to that of total knee prosthesis. Knees may fail because positioning of the prosthesis has been suboptimal. The aim of this study was to investigate the influence of the tibial slope on the rate of wear of a medial fixed-bearing unicompartmental knee arthroplasty.Materials and Methods. We simulated wear on a medial fixed-bearing unicompartmental knee prosthesis (Univation) in vitro with a customised, four-station, and servohydraulic knee wear simulator, which exactly reproduced the walking cycle (International Organisation for Standardisation (ISO) 14243-1:2002(E)). The medial prostheses were inserted with 3 different posterior tibial slopes: 0°, 4°, and 8° (n= 3 in each group).Results. The wear rate decreased significantly between 0° and 4° slope from 10.4 (SD 0.62) mg/million cycles to 3.22 (SD 1.71) mg/million cycles. Increasing the tibial slope to 8° did not significantly change the wear rate.Discussion. As an increase in the tibial slope reduced the wear rate in a fixed-bearing prosthesis, a higher tibial slope should be recommended. However, other factors that are influenced by the tibial slope (e.g., the tension of the ligament) must also be considered.

APA, Harvard, Vancouver, ISO, and other styles

10

Cunningham, John P., Paul Nuyujukian, Vikash Gilja, Cindy A. Chestek, Stephen I. Ryu, and Krishna V. Shenoy. "A closed-loop human simulator for investigating the role of feedback control in brain-machine interfaces." Journal of Neurophysiology 105, no. 4 (April 2011): 1932–49. http://dx.doi.org/10.1152/jn.00503.2010.

Full text

Abstract:

Neural prosthetic systems seek to improve the lives of severely disabled people by decoding neural activity into useful behavioral commands. These systems and their decoding algorithms are typically developed “offline,” using neural activity previously gathered from a healthy animal, and the decoded movement is then compared with the true movement that accompanied the recorded neural activity. However, this offline design and testing may neglect important features of a real prosthesis, most notably the critical role of feedback control, which enables the user to adjust neural activity while using the prosthesis. We hypothesize that understanding and optimally designing high-performance decoders require an experimental platform where humans are in closed-loop with the various candidate decode systems and algorithms. It remains unexplored the extent to which the subject can, for a particular decode system, algorithm, or parameter, engage feedback and other strategies to improve decode performance. Closed-loop testing may suggest different choices than offline analyses. Here we ask if a healthy human subject, using a closed-loop neural prosthesis driven by synthetic neural activity, can inform system design. We use this online prosthesis simulator (OPS) to optimize “online” decode performance based on a key parameter of a current state-of-the-art decode algorithm, the bin width of a Kalman filter. First, we show that offline and online analyses indeed suggest different parameter choices. Previous literature and our offline analyses agree that neural activity should be analyzed in bins of 100- to 300-ms width. OPS analysis, which incorporates feedback control, suggests that much shorter bin widths (25–50 ms) yield higher decode performance. Second, we confirm this surprising finding using a closed-loop rhesus monkey prosthetic system. These findings illustrate the type of discovery made possible by the OPS, and so we hypothesize that this novel testing approach will help in the design of prosthetic systems that will translate well to human patients.

APA, Harvard, Vancouver, ISO, and other styles

11

Xiang, Hua Zhong, Lan Chen, Yi Wang Bao, and Yi Ni Chang. "Data Acquisition and Control System of Hip Joint Simulator Based on LabVIEW and DSP." Key Engineering Materials 492 (September 2011): 459–62. http://dx.doi.org/10.4028/www.scientific.net/kem.492.459.

Full text

Abstract:

Hip joint simulator is a device, which is used to investigate the mechanical and frictional wear properties of the biological prosthesis under simulating physiological environment of human hip joint. The simulator is very useful for the final clinical application of the prosthesis. In this research, a data acquisition and control system, which was based on the Digital Signal Processor (DSP) and LabVIEW serial communication technology, was designed for the hip joint simulator. In order to monitoring the simulating mode of motion and stress state of prosthesis, the pressure stepping motor and the angle stepping motor were controlled by the micro-stepping step motor controllers. The angular displacement and pressure signals were collected by the sensors, respectively. Thus, the motion and stress state curves were abtained. This system provided a more accurate platform for in vitro study of the tribological properties of hip joint prosthesis.

APA, Harvard, Vancouver, ISO, and other styles

12

Medeiros, Everton C. "Design and Evaluation of a Hip Joint Implant Wear Simulator." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (August 31, 2021): 989–94. http://dx.doi.org/10.22214/ijraset.2021.37531.

Full text

Abstract:

Abstract: Every year a high number of total hip arthroplasty is reported worldwide and an increase in this number is expected. Several factors may cause hip wear, such as osteoarthritis, obesity, traffic accidents and sport practicing. Wear is a concern when considering hip prostheses, since a prosthesis presents finite life that in many cases is shorter than patient life, and leads to substitution. Also, research is constant and new developments have to be tested, which leads to the necessity of testing devices that reproduce real conditions of hip joint implant functioning. This work describes a low-cost device, according to the ISO 12242. The equipment was built, a set of three commercially available prostheses was tested and the results show wear values coherent with those found in literature. It was found a value of wear rate of (13.30 ± 3,81) mg/106 cycles; wear factor found was (0.41 ± 0,09) x 10-6 mm3 /Nm. After testing, the device was evaluated and no component presented significant wear. Keywords: Hip joint simulator; Prostheses; Wear; Arthroplasty; Test machine.

APA, Harvard, Vancouver, ISO, and other styles

13

Wetherell, R. G., A. Unsworth, and A. A. Amis. "The Function of Bipolar Hip Prostheses—A Laboratory Study Using Cadaveric Acetabula." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 206, no. 1 (March 1992): 37–42. http://dx.doi.org/10.1243/pime_proc_1992_206_259_02.

Full text

Abstract:

Cadaveric acetabula were mounted in a hip simulator and the friction developed in each during articulation with a series of metal femoral head prostheses of differing sizes was measured. In a separate study, assembled Hastings bipolar hip prostheses were subjected to weight-bearing forces in the same acetabula and their self-righting mechanism was observed. The self-righting mechanism was found to function efficiently, in most cases overcoming the combined friction of the inner and outer articulations of the Hastings hip. However, during motion in the hip simulator a wide variation of friction was observed between different acetabula and within the same acetabulum with differing head size. In several cases this acetabular friction was found to be less than the friction in the inner articulation of the Hastings bipolar hip prosthesis, and this may explain some cases of reported failure of biarticular function.

APA, Harvard, Vancouver, ISO, and other styles

14

Safaeepour, Zahra, Ali Esteki, Farhad Tabatabai Ghomshe, and Mohammad E. Mousavai. "Design and development of a novel viscoelastic ankle-foot prosthesis based on the human ankle biomechanics." Prosthetics and Orthotics International 38, no. 5 (February 14, 2014): 400–404. http://dx.doi.org/10.1177/0309364613505108.

Full text

Abstract:

Background and aim: In the present study, a new approach was applied to design and develop a viscoelastic ankle-foot prosthesis. The aim was to replicate the intact ankle moment–angle loop in the normal walking speed. Technique: The moment–angle loop of intact ankle was divided into four parts, and the appropriate models including two viscoelastic units of spring-damper mechanism were considered to replicate the passive ankle dynamics. The developed prototype was then tested on a healthy subject with the amputee gait simulator. The result showed that prosthetic ankle moment–angle loop was similar to that of intact ankle with the distinct four periods. Discussion: The findings suggest that the prototype successfully provided the human ankle passive dynamics. Therefore, the viscoelastic units could imitate the four periods of a normal gait. Clinical relevance The novel viscoelastic foot prosthesis could provide natural ankle dynamics in a gait cycle. Applying simple but biomechanical approach is suggested in conception of new designs for prosthetic ankle-foot mechanisms.

APA, Harvard, Vancouver, ISO, and other styles

15

Barber, Samuel R., Elliott D. Kozin, Matthew R. Naunheim, Rosh Sethi, Aaron K. Remenschneider, and Daniel G. Deschler. "3D-printed tracheoesophageal puncture and prosthesis placement simulator." American Journal of Otolaryngology 39, no. 1 (January 2018): 37–40. http://dx.doi.org/10.1016/j.amjoto.2017.08.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Romkema, Sietske, Raoul M. Bongers, and Corry K. van der Sluis. "Intermanual Transfer in Training With an Upper-Limb Myoelectric Prosthesis Simulator: A Mechanistic, Randomized, Pretest-Posttest Study." Physical Therapy 93, no. 1 (January 1, 2013): 22–31. http://dx.doi.org/10.2522/ptj.20120058.

Full text

Abstract:

BackgroundIntermanual transfer may improve prosthetic handling and acceptance if used in training soon after an amputation.ObjectiveThe purpose of this study was to determine whether intermanual transfer effects can be detected after training with a myoelectric upper-limb prosthesis simulator.DesignA mechanistic, randomized, pretest-posttest design was used.ParticipantsA total of 48 right-handed participants (25 women, 23 men) who were able-bodied were randomly assigned to an experimental group or a control group.InterventionThe experimental group performed a training program of 5 days' duration using the prosthesis simulator. To determine the improvement in skill, a test was administered before, immediately after, and 6 days after training. The control group only performed the tests. Training was performed with the unaffected arm, and tests were performed with the affected arm (the affected arm simulating an amputated limb). Half of the participants were tested with the dominant arm and half with the nondominant arm.MeasurementsInitiation time was defined as the time from starting signal until start of the movement, movement time was defined as the time from the beginning of the movement until completion of the task, and force control was defined as the maximal applied force on a deformable object.ResultsThe movement time decreased significantly more in the experimental group (F2,92=7.42, P=.001, ηG2=.028) when compared with the control group. This finding is indicative of faster handling of the prosthesis. No statistically significant differences were found between groups with regard to initiation time and force control. We did not find a difference in intermanual transfer between the dominant and nondominant arms.LimitationsThe training utilized participants who were able-bodied in a laboratory setting and focused only on transradial amputations.ConclusionsIntermanual transfer was present in the affected arm after training the unaffected arm with a myoelectric prosthesis simulator, and this effect did not depend on laterality. This effect may improve rehabilitation of patients with an upper-limb amputation.

APA, Harvard, Vancouver, ISO, and other styles

17

Saikko, V., P. Paavolainen, M. Kleimola, and P. Slätis. "A Five-Station Hip Joint Simulator for Wear Rate Studies." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 206, no. 4 (December 1992): 195–200. http://dx.doi.org/10.1243/pime_proc_1992_206_291_02.

Full text

Abstract:

The aim of the work has been the development of a hip joint simulator for comparative wear rate studies of long duration. A five-station apparatus has been designed, constructed and tested. Five total hip joints can be tested at the same time in identical conditions. The flexion-extension motion and the superior-inferior component of the joint contact force are incorporated. The motion is electromechanical and the loading pneumatic. The angle and load waveforms are fixed and simulate level walking. For accurate wear measurements each station employs a control prosthesis. The conditions of the control prosthesis in regard to loading, exposure to lubricant and environment temperature (37 ± 1°C) are identical to those of the test prosthesis. The acetabular cups can be readily removed for periodic wear measurements and reassembled in exactly the original position. Extensive tests have shown that the simulator is a practical and reliable instrument in the wear rate studies of various designs of total hip joint.

APA, Harvard, Vancouver, ISO, and other styles

18

Liu, C., S. M. Green, N. D. Watkins, P. J. Gregg, and A. W. McCaskie. "A preliminary hip joint simulator study of the migration of a cemented femoral stem." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 217, no. 2 (February 1, 2003): 127–35. http://dx.doi.org/10.1243/09544110360579349.

Full text

Abstract:

A hip joint simulator that can be used to evaluate the outcome of the cemented total hip replacement has been designed, manufactured and evaluated. The simulator produces motion of a cemented hip construct in the extension/flexion plane, with a socket to rotate internal/externally. At the same time a dynamic loading cycle is applied to the construct. A validation test was performed on a cemented femoral stem within a novel composite femur. The study demonstrates the value of using a hip joint simulator to evaluate the outcome of the cemented hip construct. A complex migration pattern of the cemented hip prosthesis with respect to load cycling was observed, demonstrated in vitro comparable prosthesis migration behaviour, both the stem migration and migration patterns, to that found clinically.

APA, Harvard, Vancouver, ISO, and other styles

19

Shishido, Takaaki, Kengo Yamamoto, Ian C. Clarke, T. Masaoka, M. Manaka, and Toshiyuki Tateiwa. "Comparison of the Results of a Simulator Study and Retrieval Implants in Ceramic THA." Key Engineering Materials 309-311 (May 2006): 1277–80. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.1277.

Full text

Abstract:

In simulator studies, the Biolox-forte hip prosthesis were run for 5 million cycles (Mc) using 50% new born calf serum for both the standard test (STD) mode and the micro-separation test (MSX) mode. Wear measurements were carried out every 0.5 Mc. The wear patterns were mapped and observed by SEM. In a clinical study, the OstealTM hip prostheses which were implanted for 15 to 19 years and 17 year BioloxTM hip prostheses were analyzed. According to the same technique as the simulator study, the wear patterns were analyzed using SEM. The steady-state wear rates for alumina THR ranged from 0.16 to 0.65 mm3/Mc in the MSX mode and 0.011 mm3/Mc in the STD mode. The MSX simulator mode produced two narrow wear scars (stripes) of dull appearance on the ball. In the SEM analysis, the stripe scars showed mild wear after 5 Mc duration. In the Biolox and the Osteal retrieval alumina ball, the stripe scars showed severe wear. The Osteal retrievals had one grade lower wear in the main worn area than the Biolox retrievals on SEM analysis. The stripe wear and its location in the retrieval balls were seen in the simulator study. The area and wear severity of the stripe wear were influenced by the quality of alumina, design of THA and various actual motions in patients.

APA, Harvard, Vancouver, ISO, and other styles

20

Li, Will X. Y., Ray C. C. Cheung, Yao Xin, Dong Song, and Theodore W. Berger. "An FPGA-Based High-Performance Neural Ensemble Spiking Activity Simulator Utilizing Generalized Volterra Kernel and Complexity Analysis." Journal of Circuits, Systems and Computers 25, no. 01 (November 15, 2015): 1640004. http://dx.doi.org/10.1142/s0218126616400041.

Full text

Abstract:

Neural information is represented and transmitted among neuronal units by a series of all-or-none “neural codes”. During the process of neural prosthesis design, generally, a large amount of “neural codes” need to be captured and analyzed, which brings about an important discipline, known as neuroinformatics. However, in neuroinformatics study, this coding process, also termed as “spiking activity”, is not straightforward for prediction. It is owing to the high nonlinearity and dynamic property involved in generation of the neuronal spikes. In this paper, a novel generalized Volterra kernel-based neural spiking activity simulator is introduced for prediction of the neural codes in mammalian hippocampal region. High-performance VLSI architecture is established for the simulator based on high-order Volterra kernels involving cross-terms. The effectiveness and efficiency of the simulator are proven in experimental settings. This simulator has the potential to serve as a core functional unit in future hippocampal cognitive neural prosthesis.

APA, Harvard, Vancouver, ISO, and other styles

21

Haverkate, Liz, Gerwin Smit, and Dick H. Plettenburg. "Assessment of body-powered upper limb prostheses by able-bodied subjects, using the Box and Blocks Test and the Nine-Hole Peg Test." Prosthetics and Orthotics International 40, no. 1 (October 21, 2014): 109–16. http://dx.doi.org/10.1177/0309364614554030.

Full text

Abstract:

Background: The functional performance of currently available body-powered prostheses is unknown. Objective: The goal of this study was to objectively assess and compare the functional performance of three commonly used body-powered upper limb terminal devices. Study design: Experimental trial. Methods: A total of 21 able-bodied subjects ( n = 21, age = 22 ± 2) tested three different terminal devices: TRS voluntary closing Hook Grip 2S, Otto Bock voluntary opening hand and Hosmer Model 5XA hook, using a prosthesis simulator. All subjects used each terminal device nine times in two functional tests: the Nine-Hole Peg Test and the Box and Blocks Test. Results: Significant differences were found between the different terminal devices and their scores on the Nine-Hole Peg Test and the Box and Blocks Test. The Hosmer hook scored best in both tests. The TRS Hook Grip 2S scored second best. The Otto Bock hand showed the lowest scores. Conclusion: This study is a first step in the comparison of functional performances of body-powered prostheses. The data can be used as a reference value, to assess the performance of a terminal device or an amputee. Clinical relevance The measured scores enable the comparison of the performance of a prosthesis user and his or her terminal device relative to standard scores.

APA, Harvard, Vancouver, ISO, and other styles

22

Su, Jian, Jian-Jun Wang, Shi-Tong Yan, Min Zhang, Hui-Zhi Wang, Ning-Ze Zhang, Yi-Chao Luan, and Cheng-Kung Cheng. "In Vitro Analysis of Wearing of Hip Joint Prostheses Composed of Different Contact Materials." Materials 14, no. 14 (July 7, 2021): 3805. http://dx.doi.org/10.3390/ma14143805.

Full text

Abstract:

Cobalt-chromium-molybdenum alloy (CoCrMo) and ceramic are the two most common materials for the femoral head in hip joint prostheses, and the acetabular liner is typically made from ultra-high molecular weight polyethylene (UHMWPE), highly cross-linked polyethylene (XLPE), or highly cross-linked polyethylene blended with Vitamin E (VEXLPE). The selection of suitable materials should consider both wear performance and cost-effectiveness. This study compared the wear rate between different friction pairs using a hip joint simulator and then recommended a suitable prosthesis based on the corresponding processing technology and cost. All wear simulations were performed in accordance with ISO 14242, using the same hip joint simulator and same test conditions. This study found that when using the same material for the femoral head, the XLPE and VEXLPE liners had a lower wear rate than the UHMWPE liners, and the wear rate of the XLPE liners increased after blending with Vitamin E (VEXLPE). There was no significant difference in the wear rate of XLPE when using a CoCrMo or ceramic head. Considering the wear rate and cost-effectiveness, a CoCrMo femoral head with an accompanying XLPE liner is recommended as the more suitable combination for hip prostheses.

APA, Harvard, Vancouver, ISO, and other styles

23

Romkema, Sietske, Raoul M. Bongers, and Corry K. van der Sluis. "Intermanual Transfer Effect in Young Children After Training in a Complex Skill: Mechanistic, Pseudorandomized, Pretest-Posttest Study." Physical Therapy 95, no. 5 (May 1, 2015): 730–39. http://dx.doi.org/10.2522/ptj.20130490.

Full text

Abstract:

BackgroundIntermanual transfer implies that motor skills learned on one side of the body transfer to the untrained side. This effect was previously noted in adults practicing with a prosthesis simulator.ObjectiveThe study objective was to determine whether intermanual transfer is present in children practicing prosthetic handling.DesignA mechanistic, pseudorandomized, pretest-posttest design was used.SettingThe study was conducted in a primary school in the Netherlands.ParticipantsThe participants were children who were able-bodied (N=48; 25 boys, 23 girls; mean age=5.1 years) and randomly assigned to an experimental group or a control group.InterventionThe experimental group performed 5 training sessions using a prosthesis simulator on the training arm. Before (pretest), immediately after (posttest), and 6 days after (retention test) the training program, their ability to handle the prosthesis with the contralateral (test) arm was measured. The control group only performed the tests. Half of the children performed the tests with the dominant hand, and the other half performed the tests with the nondominant hand.MeasurementsDuring the tests, movement time and control of force were measured.ResultsAn interaction effect of group by test was found for movement time. Post hoc tests revealed significant improvement in the experimental group between the posttest and the retention test. No force control effect was found.LimitationsOnly children who were able-bodied were included. Measurements should have been masked and obtained without tester interference. The fact that 4 children whose results were slower than the mean result discontinued training may have biased the findings.ConclusionsThe intermanual transfer effect was present in 5-year-old children undergoing training in prosthetic handling. After training of one hand, children's movement times for the other, untrained hand improved. This finding may be helpful for training children who are novice users of a prosthesis.

APA, Harvard, Vancouver, ISO, and other styles

24

WIŚNIEWSKI, Tomasz, Adrian MRÓZ, Janusz MAGDA, and Agnieszka WIELOWIEJSKA-GIERTUGA. "STAND FOR TRIBOLOGICAL TESTING OF HIP ENDOPROSTHESES." Tribologia 270, no. 6 (December 31, 2016): 167–77. http://dx.doi.org/10.5604/01.3001.0010.6936.

Full text

Abstract:

The paper presents a new construction of hip-joint simulator. The SBT-01.2 simulator is designed for conducting tribological testing of hip endoprostheses based on ISO 14242-1, which specifies the requirements for the range of motion and load characteristics of the friction pair (femoral head vs. acetabular cup) during one test cycle. The construction of the simulator is based on the anatomical structure of the human hip joint. The prosthesis acetabulum is mounted in the upper part of the mounting head while maintaining the inclination angle relative to the axis of the socket to the direction of the loading force. The head of the prosthesis is mounted on a pin embedded in the bottom, movable base. After placing a special sleeve on the lower base, liquid lubricant is applied on the head-cup tribological system. The employed software enables continuous control, online visualization, and data recording. During testing, parameters such as lubricant temperature, instantaneous loading force, friction torque, and the number of cycles are recorded.

APA, Harvard, Vancouver, ISO, and other styles

25

Kim, Su Young, Junho Ko, Seong-wook Jang, Yon-Sik Yoo, and Yoon Sang Kim. "A prosthesis insertion training simulator for reverse total shoulder arthroplasty." Journal of Digital Contents Society 20, no. 1 (January 31, 2019): 15–20. http://dx.doi.org/10.9728/dcs.2019.20.1.15.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Leonard, L., D. M. Sirkett, I. J. Langdon, G. Mullineux, D. G. Tilley, P. S. Keogh, J. L. Cunningham, et al. "Engineering a new wrist joint replacement prosthesis—a multidisciplinary approach." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 216, no. 9 (September 1, 2002): 1297–302. http://dx.doi.org/10.1243/095440502760291844.

Full text

Abstract:

The wrist joint is highly complex and there remain unresolved problems to be overcome in designing a successful wrist joint prosthesis. Consequently, the results of total wrist joint replacements have been poor compared to those for hip and knee joint replacements. A multidisciplinary team of orthopaedic surgeons and engineers is working at Bath to tackle some of the key issues in the engineering of a new wrist joint prosthesis. Following a brief background to the work being undertaken by the group, this paper describes two ongoing research activities. Firstly, an assessment is being made of the optimum geometry for a wrist replacement through the use of a geometric constraint modeller. The second activity is the development of a mechanical simulator to assess wrist prosthesis function and loading. A computer algorithm controls articulation of the wrist using cables that mimic normal wrist tendons. This system allows for full movement of the hand and can also simulate external loading. The forces transmitted at the prosthesis/bone interfaces can be monitored using sensors attached adjacent to the prosthesis.

APA, Harvard, Vancouver, ISO, and other styles

27

Spinelli, M., S. Affatato, M. K. Harman, and J. D. DesJardins. "Bi-unicondylar knee prosthesis functional assessment utilizing force-control wear testing." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 224, no. 7 (December 28, 2009): 813–21. http://dx.doi.org/10.1243/09544119jeim726.

Full text

Abstract:

Recent in vivo studies have identified variations in knee prosthesis function depending on prosthesis geometry, kinematic conditions, and the absence/presence of soft-tissue constraints after knee replacement surgery. In particular, unicondylar knee replacements (UKR) are highly sensitive to such variations. However, rigorous descriptions of UKR function through experimental simulation studies, performed under physiological force-controlled conditions, are lacking. The current study evaluated the long-term functional performance of a widely used fixed-bearing unicompartmental knee replacement, mounted in a bi-unicondylar configuration (Bi-UKR), utilizing a force-controlled knee simulator during a simulated (ISO 14243) walking cycle. The wear behaviour, the femoral—tibial kinematics, and the incurred damage scars were analysed. The wear rates for the medial and the lateral compartments were 10.27 ± 1.83 mg/million cycles and 4.49 ± 0.53 mg/million cycles, respectively. Although constant-input force-controlled loading conditions were maintained throughout the simulation, femoral—tibial contact point kinematics decreased by 65 to 68 per cent for average anterior/posterior travel and by 58 to 74 per cent for average medial/lateral travel with increasing cycling time up to 2 million cycles. There were no significant differences in damage area or damage extent between the medial and the lateral compartments. Focal damage scars representing the working region of the femoral component on the articular surface extended over a range of 16—21 mm in the anterior—posterior direction. Kinematics on the shear plane showed slight variations with increasing cycling time, and the platform exhibited medial pivoting over the entire test. These measures provide valuable experimental insight into the effect of the prosthesis design on wear, kinematics, and working area. These functional assessments of Bi-UKR under force-controlled knee joint wear simulation show that accumulated changes in the UKR articular conformity manifested as altered kinematics both for anterior/posterior translations and internal/external rotations.

APA, Harvard, Vancouver, ISO, and other styles

28

Naidu, Sanjiv H., and Alex Radin. "Isoelastic Distal Ulnar Head Prosthesis: An In Vitro Joint Simulator Study." Journal of Hand Surgery 34, no. 3 (March 2009): 409–14. http://dx.doi.org/10.1016/j.jhsa.2008.11.031.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Brummitt, K., and C. S. Hardaker. "Estimation of Wear in Total Hip Replacement Using a Ten Station Hip Simulator." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 210, no. 3 (September 1996): 187–90. http://dx.doi.org/10.1243/pime_proc_1996_210_411_02.

Full text

Abstract:

The results of hip simulator tests on a total of 16 total hip joints, all of them 22.25 mm Charnley designs, are presented. Wear at up to 6.75 million cycles was assessed by using a coordinate measuring machine. The results gave good agreement with clinical estimates of wear rate on the same design of joint replacement from a number of sources. Good agreement was also obtained when comparison was made with the published results from more sophisticated simulators. The major source of variation in the results was found to occur in the first million cycles where creep predominates. The results of this study support the use of this type of simplified simulator for estimating wear in a total hip prosthesis. The capability to test a significant number of joints simultaneously may make this mechanism preferable to more complex machines in many cases.

APA, Harvard, Vancouver, ISO, and other styles

30

Frey, Martin, Jens Hoogen, Rainer Burgkart, and Robert Riener. "Physical Interaction with a Virtual Knee Joint—The 9 DOF Haptic Display of the Munich Knee Joint Simulator." Presence: Teleoperators and Virtual Environments 15, no. 5 (October 1, 2006): 570–87. http://dx.doi.org/10.1162/pres.15.5.570.

Full text

Abstract:

In specific fields, medical education at many universities is rather theoretical and the amount of practical training is limited. A significant improvement can be achieved using virtual reality training stations with lifelike visual, acoustic, tactile, and kinesthetic feedback. Particularly, when simulating procedures that require direct contact with the patient body, a realistic haptic simulation addressing tactile and kinesthetic senses can be essential for the acceptance of virtual simulation stations. A purely passive phantom may provide realistic haptic feedback, but its properties cannot be changed over time. This paper presents the haptic display of the Munich Knee Joint Simulator, which was developed to improve training and education of physical knee joint examinations. The haptic interface comprises a combination of passive phantom segments providing realistic tactile sensations, and strong actuators generating highly dynamic kinesthetic force feedback. A 3 degree of freedom (DOF) manipulator was developed in this study to drive the thigh prosthesis and one 6 DOF industrial robot was used to actuate the shank prosthesis. Both manipulators are driven by hybrid admittance-impedance controllers capable of simulating the complex dynamics of the thigh and the shank. Both actuators are equipped with a 6 DOF force torque sensor and they are virtually coupled by an analytical knee joint model. The proposed setup is capable of simulating a mechanical stiffness as high as 80 kN/m in the translatory DOF and simultaneously allows free motion in the rotatory DOF. Experimental tests of the simulator with orthopedic physicians proved the usability of the proposed concept.

APA, Harvard, Vancouver, ISO, and other styles

31

Tiré, Jan, Jan Victor, Patrick De Baets, and Matthias Verstraete. "Control of the boundary conditions of a dynamic knee simulator." International Journal Sustainable Construction & Design 6, no. 2 (July 7, 2015): 7. http://dx.doi.org/10.21825/scad.v6i2.1125.

Full text

Abstract:

At Ghent University a dynamic knee simulator to analyse the kinematics of a human knee has been developed. The rig is designed to perform tests on a mechanical hinge or on a human knee (with or without a prosthesis). The rig has one degree of freedom in a hip joint and four degrees of freedom in an ankle joint. There is currently one actuator that simulates the quadriceps forces. Two additional actuators are proposed in this paper to simulate the hamstrings forces. The magnitude and phase of the forces varies significantly during the movement (e.g. cycling or squatting). Literature indicates that the maximum muscle forces do not exceed 2000 N. An inverse dynamic analysis, using the musculoskeletal software AnyBody, is proposed to determine the evolution of these forces during the studied movements.

APA, Harvard, Vancouver, ISO, and other styles

32

Rusu, Lucian, Cosmina Vigaru, and Dan Ioan Stoia. "Determination of Mastication Forces in Case of Total Dental Prosthesis." Key Engineering Materials 638 (March 2015): 145–50. http://dx.doi.org/10.4028/www.scientific.net/kem.638.145.

Full text

Abstract:

In whole wide world, lots of individuals lose teeth from different causes. In these cases, in first phase, a dental implant is the best solution. In some cases, as the last solution, a dental prosthesis is needed. To correct these disorders, rehabilitation treatments with adequate dentures, either fixed or removable, are indicated. [6] The forces that appear during mastication are influenced by occlusion type and space distribution of teeth. In case of persons that have a dental prosthesis the forces that occurred during mastication can be reduced if the dental prosthesis is correctly generated. A mastication simulator is any device that reproduces the conditions present during the process of chewing in order to reconstruct the complicated process of mastication outside the body. [5] The aim of this paper is to produce a device that can simulate the mastication and use it to determinate the mastication forces that appears during the mastication of different foods types. On the device that was build can be placed different dental prosthesis. [2] Using the device adjustment facilities we are able to simulate any type of occlusion. Using this device, a mechanical testing equipment and different types of food we are able to determinate the vertical force that occur. Base on these results we will be able to determinate if the dental prosthesis was correctly produced.

APA, Harvard, Vancouver, ISO, and other styles

33

Chadwell, Alix, Natalie Chinn, Laurence Kenney, Zoë J. Karthaus, Daniek Mos, and Gerwin Smit. "An evaluation of contralateral hand involvement in the operation of the Delft Self-Grasping Hand, an adjustable passive prosthesis." PLOS ONE 16, no. 6 (June 17, 2021): e0252870. http://dx.doi.org/10.1371/journal.pone.0252870.

Full text

Abstract:

The Delft Self-Grasping Hand is an adjustable passive prosthesis operated using the concept of tenodesis (where opening and closing of the hand is mechanically linked to the flexion and extension of the wrist). As a purely mechanical device that does not require harnessing, the Self-Grasping Hand offers a promising alternative to current prostheses. However, the contralateral hand is almost always required to operate the mechanism to release a grasp and is sometimes also used to help form the grasp; hence limiting the time it is available for other purposes. In this study we quantified the amount of time the contralateral hand was occupied with operating the Self-Grasping Hand, classified as either direct or indirect interaction, and investigated how these periods changed with practice. We studied 10 anatomically intact participants learning to use the Self-Grasping Hand fitted to a prosthesis simulator. The learning process involved 10 repeats of a feasible subset of the tasks in the Southampton Hand Assessment Procedure (SHAP). Video footage was analysed, and the time that the contralateral hand was engaged in grasping or releasing was calculated. Functionality scores increased for all participants, plateauing at an Index of Functionality of 33.5 after 5 SHAP attempts. Contralateral hand involvement reduced significantly from 6.47 (first 3 attempts) to 4.68 seconds (last three attempts), but as a proportion of total task time remained relatively steady (increasing from 29% to 32%). For 9/10 participants most of this time was supporting the initiation of grasps rather than releases. The reliance on direct or indirect interactions between the contralateral hand and the prosthesis varied between participants but appeared to remain relatively unchanged with practice. Future studies should consider evaluating the impact of reliance on the contralateral limb in day-to-day life and development of suitable training methods.

APA, Harvard, Vancouver, ISO, and other styles

34

Lin, Xiangli. "Neurophysiology Based on Deep Neural Network under Artificial Prosthesis Vision." Journal of Physics: Conference Series 2074, no. 1 (November 1, 2021): 012083. http://dx.doi.org/10.1088/1742-6596/2074/1/012083.

Full text

Abstract:

Abstract With the vigorous development of electronic technology and computer technology, as well as the continuous advancement of research in the fields of neurophysiology, bionics and medicine, the artificial visual prosthesis has brought hope to the blind to restore their vision. Artificial optical prosthesis research has confirmed that prosthetic vision can restore part of the visual function of patients with non-congenital blindness, but the mechanism of early prosthetic image processing still needs to be clarified through neurophysiological research. The purpose of this article is to study neurophysiology based on deep neural networks under simulated prosthetic vision. This article uses neurophysiological experiments and mathematical statistical methods to study the vision of simulated prostheses, and test and improve the image processing strategies used to simulate the visual design of prostheses. In this paper, based on the low-pixel image recognition of the simulating irregular phantom view point array, the deep neural network is used in the image processing strategy of prosthetic vision, and the effect of the image processing method on object image recognition is evaluated by the recognition rate. The experimental results show that the recognition rate of the two low-pixel segmentation and low-pixel background reduction methods proposed by the deep neural network under simulated prosthetic vision is about 70%, which can significantly increase the impact of object recognition, thereby improving the overall recognition ability of visual guidance.

APA, Harvard, Vancouver, ISO, and other styles

35

Yan, Gongxing, Jialing Li, Hui Xie, and Minggui Zhou. "Adaptive Control System of Intelligent Lower Limb Prosthesis Based on 5G Virtual Reality." Wireless Communications and Mobile Computing 2022 (March 18, 2022): 1–12. http://dx.doi.org/10.1155/2022/4572503.

Full text

Abstract:

With the rapid development of computer science and technology in our country, especially the advent of the 5G network era, the emergence of smart prostheses makes it possible for disabled, injured, or amputee people with lower limbs to walk and exercise like normal people. However, due to the different selection of prosthetic materials, the final lower limb prostheses produced will also have different performance differences. How to select prosthetic materials to optimize the performance of the intelligent lower limb prosthesis is the focus of extensive discussion in the medical community. For this reason, this article takes the research of the adaptive control system of intelligent lower limb prosthesis based on 5G virtual reality as the research object. By using the current advanced 5G communication technology and virtual reality technology, a high-performance intelligent lower limb prosthesis is produced. Provide assistance with basic walking and motor abilities in daily life of patients with lower limb disabilities. This article first gives a systematic theoretical introduction to 5G virtual reality technology, expounds the current status of patients with lower limb disabilities, and proposes to use intelligent lower limb prosthetics to replace healthy lower limbs to solve the basic walking and sports needs of disabled patients in daily life and then use 5G virtual reality technology. The selection of human knee joints and ankle joints and structural system design were carried out. Finally, it was decided to use the four-bar linkage structure as the knee joint structure of the three-dimensional modeling of the intelligent lower limb prosthesis. At the end of this article, the application and simulation of the intelligent lower limb prosthesis to the human body were also carried out. The results of the experiment found that after 45 weeks of wearing exercises, the gait of the intelligent lower limb prosthesis is consistent with the expected effect whether it is walking on level ground and up and down the stairs or uphill. Due to the strong adaptiveness of the intelligent lower limb prosthesis sexual control, it can well assist the basic life movement ability of patients with lower limb disabilities.

APA, Harvard, Vancouver, ISO, and other styles

36

Seo, Ji-Hyeon, Hyuk-Jin Lee, Dong-Wook Seo, Dong-Kyu Lee, Oh-Won Kwon, Moon-Kyu Kwak, and Kang-Ho Lee. "A Prosthetic Socket with Active Volume Compensation for Amputated Lower Limb." Sensors 21, no. 2 (January 8, 2021): 407. http://dx.doi.org/10.3390/s21020407.

Full text

Abstract:

Typically, the actual volume of the residual limb changes over time. This causes the prosthesis to not fit, and then pain and skin disease. In this study, a prosthetic socket was developed to compensate for the volume change of the residual limb. Using an inflatable air bladder, the proposed socket monitors the pressure in the socket and keeps the pressure distribution uniform and constant while walking. The socket has three air bladders on anterior and posterior tibia areas, a latching type 3-way pneumatic valve and a portable control device. In the paper, the mechanical properties of the air bladder were investigated, and the electromagnetic analysis was performed to design the pneumatic valve. The controller is based on a hysteresis control algorithm with a closed loop, which keeps the pressure in the socket close to the initial set point over a long period of time. In experiments, the proposed prosthesis was tested through the gait simulator that can imitate a human’s gait cycle. The active volume compensation of the socket was successfully verified during repetitive gait cycle using the weight loads of 50, 70, and 90 kg and the residual limb model with a variety of volumes. It was confirmed that the pressure of the residual limb recovered to the initial state through the active control. The pressure inside the socket had a steady state error of less than 0.75% even if the volume of the residual limb was changed from −7% to +7%.

APA, Harvard, Vancouver, ISO, and other styles

37

Seo, Ji-Hyeon, Hyuk-Jin Lee, Dong-Wook Seo, Dong-Kyu Lee, Oh-Won Kwon, Moon-Kyu Kwak, and Kang-Ho Lee. "A Prosthetic Socket with Active Volume Compensation for Amputated Lower Limb." Sensors 21, no. 2 (January 8, 2021): 407. http://dx.doi.org/10.3390/s21020407.

Full text

Abstract:

Typically, the actual volume of the residual limb changes over time. This causes the prosthesis to not fit, and then pain and skin disease. In this study, a prosthetic socket was developed to compensate for the volume change of the residual limb. Using an inflatable air bladder, the proposed socket monitors the pressure in the socket and keeps the pressure distribution uniform and constant while walking. The socket has three air bladders on anterior and posterior tibia areas, a latching type 3-way pneumatic valve and a portable control device. In the paper, the mechanical properties of the air bladder were investigated, and the electromagnetic analysis was performed to design the pneumatic valve. The controller is based on a hysteresis control algorithm with a closed loop, which keeps the pressure in the socket close to the initial set point over a long period of time. In experiments, the proposed prosthesis was tested through the gait simulator that can imitate a human’s gait cycle. The active volume compensation of the socket was successfully verified during repetitive gait cycle using the weight loads of 50, 70, and 90 kg and the residual limb model with a variety of volumes. It was confirmed that the pressure of the residual limb recovered to the initial state through the active control. The pressure inside the socket had a steady state error of less than 0.75% even if the volume of the residual limb was changed from −7% to +7%.

APA, Harvard, Vancouver, ISO, and other styles

38

Jin, Li, Peter G. Adamczyk, Michelle Roland, and Michael E. Hahn. "The Effect of High- and Low-Damping Prosthetic Foot Structures on Knee Loading in the Uninvolved Limb Across Different Walking Speeds." Journal of Applied Biomechanics 32, no. 3 (June 2016): 233–40. http://dx.doi.org/10.1123/jab.2015-0143.

Full text

Abstract:

Lower limb amputation has been associated with secondary impairments such as knee osteoarthritis in the uninvolved limb. Greater knee loading in the frontal plane has been related to severity and rate of progression in knee osteoarthritis. Reduced push-off work from the involved limb can increase uninvolved limb knee loading. However, little is known about specific effects that prosthetic foot damping may have on uninvolved limb loading. We hypothesized that uninvolved limb peak knee internal abduction moment (IAM) and loading rates would be greater when using a high-damping foot compared with a low-damping foot, across walking speeds. Eight healthy, young subjects walked in a prosthesis simulator boot using the experimental feet. Greater uninvolved limb first peak IAM (+16% in fast speed, P = .002; +11% in slow speed, P = .001) and loading rates (+11% in fast speed, P = .003) were observed when using the high-damping foot compared with low-damping foot. Within each foot, uninvolved limb first peak IAM and loading rates had a trend to increase with increased walking speed. These findings suggest that damping properties of prosthetic feet are related to uninvolved limb peak knee IAM and loading rates.

APA, Harvard, Vancouver, ISO, and other styles

39

OHNO, Mitsutaka, Mitsugu TODO, Hidehiko HIGAKI, and Hiromasa MIURA. "2108 Deep flexion analysis of knee joint replaced by artificial prosthesis using virtual simulator." Proceedings of The Computational Mechanics Conference 2010.23 (2010): 278–79. http://dx.doi.org/10.1299/jsmecmd.2010.23.278.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Affatato, S., A. Leardini, W. Leardini, S. Giannini, and M. Viceconti. "Meniscal wear at a three-component total ankle prosthesis by a knee joint simulator." Journal of Biomechanics 40, no. 8 (January 2007): 1871–76. http://dx.doi.org/10.1016/j.jbiomech.2006.08.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Endo, Takao, Kenta Hozumi, Masakazu Hirota, Hiroyuki Kanda, Takeshi Morimoto, Kohji Nishida, and Takashi Fujikado. "The influence of visual field position induced by a retinal prosthesis simulator on mobility." Graefe's Archive for Clinical and Experimental Ophthalmology 257, no. 8 (May 30, 2019): 1765–70. http://dx.doi.org/10.1007/s00417-019-04375-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Ueno, Masaru, H. Amino, Hironobu Oonishi, Ian C. Clarke, and V. Good. "Wear of Alumina on Alumina Total Hip Prosthesis -Effect of Lubricant on Hip Simulator Test-." Key Engineering Materials 192-195 (September 2000): 561–64. http://dx.doi.org/10.4028/www.scientific.net/kem.192-195.561.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

TAKANO, Yasuju, Masaru UENO, Kazuo KIGUCHI, Syuya IDE, Mineko FUJIMIYA, Daisuke SUZUKI, Masaaki MAWATARI, and Takao HOTOKEBUCHI. "0943 Mechanical Evaluation of Complete Flexion Type Total Knee Prosthesis with Passive Knee Motion Simulator." Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2009.22 (2010): 355. http://dx.doi.org/10.1299/jsmebio.2009.22.355.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Owa, A. O., H. O. Gbejuade, and C. Giddings. "A middle-ear simulator for practicing prosthesis placement for otosclerosis surgery using ward-based materials." Journal of Laryngology & Otology 117, no. 6 (June 2003): 490–92. http://dx.doi.org/10.1258/002221503321892361.

Full text

Abstract:

Complications following stapedectomy are the most common cause of litigation involving otological cases in the USA. Manipulation and placement of the prosthesis during a stapedectomy may have a profound effect on the final hearing results. Concerns have been raised over the reduced number of cases, training of residents, and the maintenance of the necessary skills to achieve consistently good results.Temporal bone dissection is an important adjunct to developing the required skills to perform stapedectomies. However the reduced availability of specimens limits their use for teaching or practising the procedure.In order to circumvent these problems an inexpensive and easily constructed middle-ear simulator has been developed based on materials readily available in any ENT ward. It is believed that this might help trainees develop the necessary skills to master the procedure.

APA, Harvard, Vancouver, ISO, and other styles

45

Sera, Toshihiro, Yuya Iwai, Takaharu Yamazaki, Tetsuya Tomita, Hideki Yoshikawa, Hisahi Naito, Takeshi Matsumoto, and Masao Tanaka. "Strain measurements of the tibial insert of a knee prosthesis using a knee motion simulator." Journal of Orthopaedics 14, no. 4 (December 2017): 495–500. http://dx.doi.org/10.1016/j.jor.2017.08.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Saikko, V. "A 12-Station Anatomic Hip Joint Simulator." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 219, no. 6 (June 1, 2005): 437–48. http://dx.doi.org/10.1243/095441105x34419.

Full text

Abstract:

A novel 12-station hip joint simulator with an anatomic position of the prosthesis was designed and built. The motion of the simulator consists of flexion-extension and abduction-adduction. The load is of the double-peak type. The validation test was done with three similar 28 mm CoCr-polyethylene joints in diluted calf serum lubricant for 3.3 × 106 cycles. The bearing surfaces of the polyethylene cups were burnished, the CoCr heads were undamaged, the wear particles were in the 0.1-1 μm size range, and the mean wear factor of the polyethylene cups was 5.7 × 10−7 mm3/N m. These essential observations were in good agreement with clinical findings. In addition, three similar 50 mm CoCR/CoCr joints, representing the contemporary large-diameter metal-on-metal articulation were tested. The wear of the CoCr/CoCr joints was calculated from the Co and Cr concentrations of the used lubricant quantified with atomic absorption spectroscopy. The bearing surfaces of the CoCr/CoCr jonits showed mild criss-cross scratching only. The average wear factor of polyethylene cups was 275 times that of the CoCr/CoCr joints. The tribological behaviour of the large-dia. CoCr/CoCr appeared to be dominated by fluid film lubrication, as indicated by very low frictional heating and wear, making it tribologically superior to the conventional CoCr/polyethylene, and therefore very interesting clinically. In conclusion, the simulator proved to be a valid, reliable, practical, economical, and easy-to-operate tool for wear studies of various hip replacement designs.

APA, Harvard, Vancouver, ISO, and other styles

47

Rajah, Jefferson K., William Chernicoff, Christopher J. Hutchison, Paulo Gonçalves, and Birgit Kopainsky. "Enabling Mobility: A Simulation Model of the Health Care System for Major Lower-Limb Amputees to Assess the Impact of Digital Prosthetics Services." Systems 11, no. 1 (January 3, 2023): 22. http://dx.doi.org/10.3390/systems11010022.

Full text

Abstract:

The World Health Organization estimates that 5 to 15% of amputees in any given population have access to a prosthesis. This figure is likely to worsen as the amputee population is expected to double by 2050, straining the limited capacity of prosthetics services. Without proper and timely prosthetic interventions, amputees with major lower-limb loss experience adverse mobility outcomes, including the loss of independence, lowered quality of life, and decreased life expectancy. Presently, the use of digital technology in prosthetics (e.g., 3D imaging, digital processing, and 3D printed sockets) is contended as a viable solution to this problem. This paper uses system dynamics modeling to assess the impact of digital prosthetics service provision. Our simulation model represents the patient-care continuum and digital prosthetics market system, providing a feedback-rich causal theory of how digital prosthetics impacts amputee mobility and the corollary socio-health-economic outcomes over time. With sufficient resources for market formation and capacity expansion for digital prosthetics services, our work suggests an increased proportion of prosthesis usage and improved associated health-economic outcomes. Accordingly, our findings could provide decision support for health policy to better mitigate the accessibility problem and bolster the social impact of prosthesis usage.

APA, Harvard, Vancouver, ISO, and other styles

48

Bolotov, Denis D., Sergey M. Starikov, and Yana N. Zakharova. "Application of suspension systems with rigid elastic elements in the physical rehabilitation of patients with amputation defects of the lower extremities." Russian Journal of Physiotherapy, Balneology and Rehabilitation 20, no. 4 (July 4, 2022): 315–23. http://dx.doi.org/10.17816/rjpbr107370.

Full text

Abstract:

BACKGROUND: Exercise on suspension systems (gravitational neuromuscular activation) is a highly effective means of physical rehabilitation for patients with various pathologies. Modernization of these products through the use of rigid elastic slings or equipping standard simulators with elastic elements expands the capabilities of this type of equipment, allows you to master new types of exercises, positively affecting the strength, tone and endurance of muscle groups. AIMS: to study the impact of the inclusion of suspension systems with rigid elastic elements (slings) in physical rehabilitation programs for patients with amputation stumps at the hip level. MATERIAL AND METHODS: Twelve patients were tested before and after repeated prosthetics in the conditions of the FB MSE Clinic, which, due to the use of suspension systems, including elastic elements, not only increased strength, endurance and coordination relationships of muscles, but also changed the structure of their walking. The active part of the course of physical rehabilitation with the inclusion of suspension systems with elastic elements was less than two weeks. Setting the patient the task of increasing the speed of movement on the prosthesis in the long term, in the near future we focused exclusively on the correctness of the step structure and subjective sensations. RESULTS: The technical improvement of suspension systems due to elastic elements increases the convenience of their use, the speed of mastering by patients and the degree of efficiency, determining a high percentage of achieving the planned result. Inclusion in the course of training on the simulator with the use of elastic slings allows the patient to master and confidently perform various complexly coordinated movements, including squats, to participate in new types of game activities, which contributes to an increase in his adaptation and socialization in society. Subjectively, patients note greater strength of muscle groups that have undergone additional stress on these systems, improved coordination of movements and endurance when walking on a prosthesis as a whole, as well as a sense of "correctness" of walking, which is confirmed by clinical examination methods and the results of biomechanical tests (increased pace and speed of walking with a decrease in the duration of the step cycle). CONCLUSIONS: Suspension systems are most useful for the prevention and elimination of atrophy of the muscles that support the movement of the pelvic girdle, in comparison with conventional dynamic training and walking on a prosthesis. Modifications of suspension systems by including elastic elements in them allow functional training not only using static, but also dynamic exercises, expanding their application possibilities in medical and complex rehabilitation, adaptive physical culture and adaptive sports.

APA, Harvard, Vancouver, ISO, and other styles

49

Boujelbene, M., S. Dhouibi, M. Kharrat, and M. Dammak. "Analysis of the Biotribological Behavior for the Stainless Steel/Polyethylene Contact Using a Knee Prosthesis Simulator." Journal of Bionic Engineering 9, no. 1 (March 2012): 59–64. http://dx.doi.org/10.1016/s1672-6529(11)60097-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

NAITO, Hisashi, Kazunori Hase, Takenobu INOUE, Takanori AIKAWA, Nobuya YAMASAKI, and Motoi SUWA. "Development of a Simulator for Human Walking with Hip Disarticulation Prosthesis using Neuro-Musculo-Skeletal Model." Proceedings of the JSME annual meeting 2004.5 (2004): 155–56. http://dx.doi.org/10.1299/jsmemecjo.2004.5.0_155.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Prosthesis simulator'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles