We are proudly a Ukrainian website. Our country was attacked by Russian Armed Forces on Feb. 24, 2022.
You can support the Ukrainian Army by following the link: https://u24.gov.ua/.
Even the smallest donation is hugely appreciated!
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Mechanical ablation".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Articoli di riviste sul tema "Mechanical ablation":
1
Nijland, Hendricus, Jinwen Zhu, Thomas C. Kwee, Ding-Jun Hao e Paul C. Jutte. "Mechanical bone strength decreases considerably after microwave ablation–Ex-vivo and in-vivo analysis in sheep long bones". PLOS ONE 18, n. 10 (12 ottobre 2023): e0292177. http://dx.doi.org/10.1371/journal.pone.0292177.
Background Bone metastases are on the rise due to longer survival of cancer patients. Local tumor control is required for pain relief. Microwave ablation (MWA) is a technique for minimally invasive local tumor treatment. Tumor tissue is destroyed by application of local hyperthermia to induce necrosis. Given the most common setting of palliative care, it is generally considered beneficial for patients to start mobilizing directly following treatment. No data on mechanical strength in long bones after MWA have been published so far. Materials and methods In- and ex-vivo experiments on sheep tibias were performed with MWA in various combinations of settings for time and power. During the in-vivo part sheep were sacrificed one or six weeks after ablation. Mechanical strength was examined with a three-point bending test for ablations in the diaphysis and with an indentation test for ablations in the metaphysis. Results MWA does not decrease mechanical strength in the diaphysis. In the metaphysis strength decreased up to 50% six weeks after ablation, which was not seen directly after ablation. Conclusion MWA appears to decrease mechanical strength in long bone metaphysis up to 50% after six weeks, however strength remains sufficient for direct mobilization. The time before normal strength is regained after the remodeling phase is not known.
2
Asghar, Muhammad, Nadeem Iqbal, Sadia Sagar Iqbal, Mohsin Farooq e Tahir Jamil. "Ablation and thermo-mechanical tailoring of EPDM rubber using carbon fibers". Journal of Polymer Engineering 36, n. 7 (1 settembre 2016): 713–22. http://dx.doi.org/10.1515/polyeng-2015-0337.
Abstract Carbon fibers (CFs) are incorporated into ethylene propylene diene monomer (EPDM) rubber to fabricate charring elastomeric ablative composites for ultrahigh temperature applications. Ablation characteristics of the ablative composites were evaluated using ASTM E285-08. Variant content incorporation of short CFs in the basic composite formulation reduced the backface temperature acclivity and the ablation rate rose up to 48% and 78%, correspondingly. Thermal stability and endothermic capability were improved with increasing short fiber contents in the rubber matrix. Experimental thermal conductivity measurement results elucidate that thermal conductivity reduces 60% at 473 K with 6 wt% addition of the fibers. A remarkable improvement was scrutinized in the tensile strength and rubber hardness with increasing fiber to matrix ratio. Scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDS) analysis of the composite specimens revealed the uniform dispersion of CFs within the host matrix, formation of voids during ablation, char-reinforcement interaction and composition of the charred ablators and the impregnated fibers.
3
Xu, Yi Hua, Chun Bo Hu, Zhuo Xiong Zeng e Yu Xin Yang. "Research on Mechanical Model of EPDM Insulation Charring Layer". Applied Mechanics and Materials 152-154 (gennaio 2012): 57–63. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.57.
The coupling effect of physics, chemistry and mechanics is through charring layer in the process of ablation of the insulation material. Description of the structure and mechanical properties of charring layer is the critical factor to numerical computation for foretelling the ablation of insulation material. The characteristic of charring layer structure of EPDM insulation at sorts of ablating condition were analyzed, and based on characteristic of porous medium of charring layer, the mechanical model with porosity as parameter was modeled by using theory of solid porous medium. According to the intensity determination of charring layer, the coefficient of intensity model was determined, then, the failure criterion of charring layer was set up, which can provide the mechanical parameters of charring layer for numerical computation to foretell the ablation of insulation material.
4
McDermott, Ryan M., Jitendra S. Tate e Joseph H. Koo. "Exploration of a new affordable thermal protection system utilizing 2.5D silica/polysiloxane composite". Journal of Composite Materials 56, n. 5 (22 dicembre 2021): 685–98. http://dx.doi.org/10.1177/00219983211038622.
Ablative materials are used as thermal protection systems (TPS) for reentry vehicles and solid rocket motor (SRM) nozzle applications. Phenolic and cyanate ester are the state-of-the-art (SOTA) resin systems used in many of the ablative composites today, including MX-2600 (silica/phenolic) from Cytec Solvay Group. While these ablatives have worked well, more demanding requirements drive the need for affordable lightweight advanced composites capable of handling high heat fluxes with minimal mass loss. These advanced ablative composites result in lighter reentry heat shields and solid rocket motors, increasing payload capabilities of spacecraft and rockets. Molding compound made of aerospace grade 99% SiO2 fabric and polysiloxane resin showed considerable improvement over MX-2600 in ablation properties in recent studies. In order to meet increased mechanical strength demands, NASA recently developed an ablative composite using a 3D quartz woven/cyanate ester composite material designed for the Orion spacecraft. While 3D woven composites provide excellent out-of-plane mechanical and ablation properties, they are very expensive, which limits their application. This research explores needle-punched silica fabric, sometimes referred to as 2.5D, which provides similar out-of-plane mechanical benefits to 3D woven composites in a more flexible VARTM manufacturing process at a much lower cost. The needle-punched silica fabric was infiltrated with polysiloxane resin and mechanical tests were performed. The needle-punched composites showed an increase of 181% in flexural strength, 27% in interlaminar shear strength, 2% in tensile strength, and 13% in compressive strength. In aerothermal ablation tests, the 2.5D out-performed the 2D laminate in char yield, mass loss, and recession rate; and in char yield and mass loss (%), the 2.5D out-performed the industry standard MX-2600 molding compound. The increased out-of-plane strength and char yield make it a promising and affordable ablative candidate for ablation performance with enhanced mechanical properties.
5
Mancia, Lauren, Eli Vlaisavljevich, Nyousha Yousefi, Adam Maxwell, Geoffrey W. Siegel, Zhen Xu e Eric Johnsen. "Focused ultrasound ablation of solid tumors: Feasibility of planning tissue-selective treatments." Journal of Clinical Oncology 38, n. 15_suppl (20 maggio 2020): e15600-e15600. http://dx.doi.org/10.1200/jco.2020.38.15_suppl.e15600.
e15600 Background: Focused ultrasound (FUS) is a noninvasive, nonionizing, repeatable local ablative therapy that induces mechanical fractionation or thermal necrosis of a variety of solid tumors including hepatocellular carcinoma, prostate cancer, and desmoid fibromatosis. Recent feasibility studies in animal models have demonstrated the possibility of designing focused ultrasound treatments that are selective (e.g. spare healthy tissue, nerves, and blood vessels) due to differences in tissue and tumor mechanical properties. Given wide variation in individual tumor and patient characteristics, mechanics-based predictions of ablation zone features in different tissues under a range of FUS device settings are needed to permit personalized treatment planning. Methods: A finite difference computational method is used to simulate FUS ablation of tissues with variable mechanical properties (shear moduli of 0.6 – 200 kPa) under different FUS sonication parameters (frequency and peak pressure). The model calculates strain fields contributing to tissue ablation in FUS treatments which are used to predict ablation zone radii and boundary characteristics. Simulation predictions in model tissues are then compared to histology obtained from FUS-treated porcine tissue samples with similar mechanical properties. Results: The mechanical properties of model tissues and FUS treatment parameters have distinct effects on predicted minimum ablation zone radii. For example, smaller ablation zone radii are achieved in stiffer vessel wall than liver under given FUS sonication parameters. In each tissue, lower frequency and higher peak pressure FUS sonication predict a larger ablation zone. Combined variation of sonication frequency and peak pressure are found to achieve wider variation in ablation zone radius than previously achieved with frequency variation alone. Predicted ablation zone radii and boundary characteristics are consistent with the observed histology of FUS-treated tissues. Conclusions: Results show that simulations accounting for tissue mechanical properties and device settings can predict tissue selectivity and ablation zone characteristics observed in FUS procedures. This study demonstrates the potential of using noninvasive measurements of tissue and tumor properties obtained, for example, via shear wave elastography, in combination with micromechanical tissue ablation simulations to develop personalized, selective focused ultrasound treatments for solid tumors.
6
Wang, Wentao, Lisheng Zhou, Yang Li, Peng Li, Guohui Chen e Shishan Yang. "Study on the Ablation Properties of Nano-graphite Modified EPDM Insulators". Journal of Physics: Conference Series 2133, n. 1 (1 novembre 2021): 012019. http://dx.doi.org/10.1088/1742-6596/2133/1/012019.
Abstract To improve the anti-ablative property of EPDM-based composites, nano-graphite powder as anti-ablation filler was introduced to optimize the EPDM insulation material formulas. Characterization of anti-ablation performance showed that the composite at the nano-graphite content of 10phr exhibited the best anti-ablation and mechanical performances, such as: a linear ablation rate of 0.062 mm/s, a mass ablation rate of 0.048 g/s, tensile strength of 5.69 MPa and Elongation at break of 391.2%. The nano-graphite was proven to be an effective material which is beneficial to improve the anti-ablation of the EPDM composites.
7
Fite, Brett Z., James Wang, Pejman Ghanouni e Katherine W. Ferrara. "A Review of Imaging Methods to Assess Ultrasound-Mediated Ablation". BME Frontiers 2022 (2 maggio 2022): 1–17. http://dx.doi.org/10.34133/2022/9758652.
Ultrasound ablation techniques are minimally invasive alternatives to surgical resection and have rapidly increased in use. The response of tissue to HIFU ablation differs based on the relative contributions of thermal and mechanical effects, which can be varied to achieve optimal ablation parameters for a given tissue type and location. In tumor ablation, similar to surgical resection, it is desirable to include a safety margin of ablated tissue around the entirety of the tumor. A factor in optimizing ablative techniques is minimizing the recurrence rate, which can be due to incomplete ablation of the target tissue. Further, combining focal ablation with immunotherapy is likely to be key for effective treatment of metastatic cancer, and therefore characterizing the impact of ablation on the tumor microenvironment will be important. Thus, visualization and quantification of the extent of ablation is an integral component of ablative procedures. The aim of this review article is to describe the radiological findings after ultrasound ablation across multiple imaging modalities. This review presents readers with a general overview of the current and emerging imaging methods to assess the efficacy of ultrasound ablative treatments.
8
Yin, Jian, Hong Bo Zhang, Xiang Xiong e Hui Jin Tao. "Ablation Behaviors of 3D Fine Woven Pierced Carbon/Carbon Composites". Advanced Materials Research 1033-1034 (ottobre 2014): 864–68. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.864.
The ablation behaviors of 3D fine woven pierced carbon/carbon (C/C) composites were tested on an arc heater and their ablation morphologies were observed by scanning electron microscopy (SEM). It shows that ablation of 3D fine woven pierced C/C composites tends to start at interfaces, defects and pores. Cracks mainly yield at the boundaries of carbon fiber bundles, interfaces of carbon fiber felts during the ablating processes. The ablation properties of 3D C/C composites in parallel direction are better than that in vertical direction. In addition, the work indicates that the ablation process is mainly controlled by mechanical denudation.
9
Li, Dong, Hong Xia Chen, Zhu Chen, Yang Li, Shu Xin Wu e Ji Gui Wang. "Mechanical and Ablative Properties of Polyacrylonitrile(PAN)/RTV Silicone Internal Insulating Composites". Advanced Materials Research 399-401 (novembre 2011): 403–6. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.403.
The polyacrylonitrile short fibers/ room temperature vulcanizing silicone rubber (PAN/RTV silicone) composites were prepared by mechanical mixing method and vulcanization at room temperature for 7 days as internal insulator. The effects of the content of fiber on the mechanical and ablative performances for the composites were investigated. The results show that with increasing content of PAN fiber filled, the tensile strength increases, the break elongation decreases, and the ablation rate(Rt) of PAN/silicone composites decreases rapidly at first, then increases. When PAN fiber content is 10phr, the ablation rate(Rt) is 0.06mm/s.
10
Kuttiwong, Keeratikarn, e Jantrawan Pumchusak. "Improvement of Thermal and Ablative Properties of Phenolic Resin by SiC and MMT". Key Engineering Materials 707 (settembre 2016): 8–12. http://dx.doi.org/10.4028/www.scientific.net/kem.707.8.
In this work, the improvement of thermal and ablative properties of the phenolic resin by the addition of silicon carbide (SiC) and montmorillonite (MMT) were studied. The phenolic composites were fabricated by hot compression. The thermal stabilities, mechanical properties and ablative properties of the neat phenolic resin and the SiC/MMT phenolic composites were examined using a Lloyd universal testing machine, thermogravimetric analysis (TGA) and ablation tests (an oxyacetylene torch), respectively. Mass ablation rates were measured after flame exposure. The results showed that SiC/MMT provided the higher thermal stabilities and lower ablation rates to the phenolic resin.
In order to investigate the thermal stress and expansion as well as the associated strain effect on material properties caused by high temperature and large temperature gradient, a two-way thermo-mechanical coupling solver is developed. This solver integrates a new structural response module to the Kentucky Aerothermodynamics and Thermal response System (KATS) framework. The structural solver uses a finite volume approach to solve either hyperbolic equations for transient solid mechanics, or elliptic equations for static solid mechanics. Then, based on the same framework, a quasi-static approach is used to couple the structural response and thermal response to estimate the thermal expansion and stress within Thermal Protection System (TPS) materials.
To better capture the thermal expansion and study its impacts on material properties such as conductivity and porosity, a moving mesh scheme is also developed and incorporated into the solver. Grid deformation is transferred among different modules in the form of variations of geometric parameters and strain effects. By doing so, a bi-direction information loop is formed to accomplish the two-way strong thermo-mechanical coupling.
Results revealed that the thermal stress experienced during atmospheric re-entry concentrates in a banded area at the edge of the pyrolysis zone and its magnitude can be large enough to cause the failure of the TPS. In addition, thermal expansion causes the whole structure to deform and the changes in material properties. Results also indicated that the impacts coming from structural response should not be ignored in thermal response.
2
Walsh, Conor James. "Image-guided robots for dot-matrix tumor ablation". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61613.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010. Cataloged from PDF version of thesis. Includes bibliographical references (p. 203-208). Advances in medical imaging now provides detailed images of solid tumors inside the body and miniaturized energy delivery systems enable tumor destruction through local heating powered by a thin electrode. However, the use of thermal ablation as a first line of treatment is limited due to the difficulty in accurately matching a desired treatment and a limited region of active heating around an electrode. The purpose of this research is to identify and quantify the current limitations of image-guided interventional procedures and subsequently develop a procedure and devices to enable accurate and efficient execution of image-based interventional plans and thus ablation of a tumor of any shape with minimal damage to surrounding tissue. Current limitations of probe placement for ablation therapy were determined by a detailed retrospective study of 50 representative CT-guided procedures. On average, 21 CT scans were performed for a given procedure (range 11-38), with the majority devoted to needle orientation and insertion (mean number of scans was 54%) and trajectory planning (mean number of scans was 19%). A regression analysis yielded that smaller and deeper lesions were associated with a higher number of CT scans for needle orientation and insertion; highlighting the difficulty in targeting. Another challenge identified was repositioning the instrument distal tip within tissue. The first robot is a patient-mounted device that aligns an instrument along a desired trajectory via two motor-actuated concentric, crossed, and partially nested hoops. A carriage rides in the hoops and grips and inserts an instrument via a two degree-of-freedom friction drive. An imagebased point-and-click user interface relates appropriate clicks on the medical images to robot commands. Mounting directly on the patient provides a sufficiently stable and safe platform for actuation and eliminates the need to compensate for chest motion; thereby reducing the cost and complexity compared to other devices. Phantom experiments in a realistic clinical setting demonstrated a mean targeting accuracy of 3.5 mm with an average of five CT scans. The second robot is for repositioning the distal tip of a medical instrument to adjacent points within tissue. The steering mechanism is based on the concept of substantially straightening a pre-curved Nitinol stylet by retracting it into a concentric outer cannula, and re-deploying it at different axial and rotational cannula positions. The proximal end of the cannula is attached to the distal end of a screw-spline that enables it to be translated and rotated with respect to the casing. Translation of the stylet relative to the cannula is achieved with a second concentric, nested smaller diameter screw that is constrained to rotate with the cannula. The robot mechanism is compatible with the CT images, light enough to be supported on a patient's chest or attached to standard stereotactic frames. Targeting experiments in a gelatin phantom demonstrated a mean targeting error of 1.8 mm between the stylet tip and that predicted with a kinematic model. Ultimately, these types of systems are envisioned being used together as part of a highly dexterous patient-mounted positioning platform that can accurately perform ablation of large and irregularly shaped tumors inside medical imaging machines - offering the potential to replace expensive and traumatic surgeries with minimally invasive out-patient procedures. by Conor James Walsh. Ph.D.
3
Chang, I.-Ta. "Excimer Laser Ablation of Polymer-Clay Nanocomposites". University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1333995807.
Payne, Barry. "The role of chromophore on pulsed laser ablation of biological tissue". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43315.
Karim, Nejad Aliabadi Parya. "Development of thermoelectric cooling system for tissue ablation". Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7536/.
There is growing interest in the use of cryosurgical treatment for the ablation of cancerous and diseased tissue. This thesis describes experimental and numerical investigation of the thermoelectric devices to be utilized in development of the cryosurgical probe for generating freezing and rewarming temperature required for tissue ablation. Thermoelectric cooling devices were used in this research due to being compact, noiseless with no moving parts and no circulating refrigerant. A novel three-dimensional model of human living tissue including metabolic heat, perfusion of blood and variation of tissue properties with temperature has been developed to determine thermal behaviour of tissue during cryosurgery process and predict the cooling requirement of the cryosurgical probe using COMSOL Multiphysics 5.2 software. COMSOL Multiphysics was used for the first time to develop three dimensional model of single stage and multistage thermoelectric devices and to predict the temperature difference across the thermoelectric modules at different input of electrical power. It is concluded that three stage thermoelectric module is capable of generating the temperature of the 213 K for cancer tissue ablation. The laboratory prototype of the cryosurgical probe was developed to investigate the performance of three stage thermoelectric device and the minimum temperature of the approximately 240 K were achieved in the experimental test. A circular hollow pin fin with lower thermal resistance was developed in SolidWorks flow simulation 2015 software and introduced as a suitable heat exchanger to be used in the laboratory prototype.
7
Lv, Wener. "A novel means of cardiac catheter guidance for ablation therapy of ventricular tachycardia". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87978.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014. Cataloged from PDF version of thesis. Includes bibliographical references (pages 118-123). This work presents a system for identifying the site of origin of ventricular tachycardia (VT) and guiding a catheter to that site in order to deliver radio-frequency (RF) ablation therapy. Myocardial infarction (MI), also known as ischemic heart disease, is one of the most common pathophysiologic substrates for the development of ventricular tachycardia (VT). Implantable cardioverter defibrillators (ICDs) have been found to be successful in terminating VT but do not prevent the initiation of the arrhythmia. Alternatively, the radiofrequency (RF) ablation procedure has been recently used as a potentially curative therapy by delivering a high-frequency current at the arrhythmia site in order to disrupt the re-entrant circuit and to prevent the arrhythmia from occurring. However, RF ablation of VT presents a great challenge. The origin of the arrhythmia may be anywhere in the ventricles, and existing techniques used to locate the site require that patients be maintained in VT for 30 to 45 minutes, which leads to blood pressure collapse in 90% of the patients. Recently, we have developed a novel guidance system for the ablative treatment of VT. This system employs an Inverse Solution Guidance Algorithm (ISGA) based upon a single equivalent moving dipole (SEMD) model for the generation of body surface potentials and is able to localize both the arrhythmia site and the ablation catheter in real-time. With the proposed system VT need be induced and maintained for only a few seconds. This system has been shown in our tank experiment and in vivo animal studies to be highly accurate, low cost and reliable. An optimization analysis of the system is also included in this thesis for the purpose of further reducing the cost and surgical risk of the RF ablative therapy. by Wener Lv. Ph. D.
8
Simsek, Bugra. "Ablation Modeling Of Thermal Protection Systems Of Blunt-nosed Bodies At Supersonic Flight Speeds". Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615414/index.pdf.
The objective of this thesis is to predict shape change due to ablation and to find temperature distribution of the thermal protection system of a supersonic vehicle under aerodynamic heating by using finite element method. A subliming ablative is used as thermal protection material. Required material properties for the ablation analyses are found by using DSC (Differential Scanning Calorimetry) and TGA (Thermogravimetric Analysis) thermal analysis techniques. DSC is a thermal analysis technique that looks at how a material' s specific heat capacity is changed by temperature and TGA is a technique in which the mass of a substance is monitored as a function of temperature. Moreover, oxyacetylene ablation tests are conducted for the subliming ablative specimens and measured recession values are compared with the analytically calculated values. Maximum difference between experimental results and analytical results is observed as 3% as seen in Table 7. For the finite element analyses, ANSYS Software is used. A numerical algorithm is developed by using programming language APDL (ANSYS Parametric Design Language) and element kill feature of ANSYS is used for simulation of ablation process. To see the effect of mesh size and time step on the solution of analyses, oxyacetylene test results are used. Numerical algorithm is also applied to the blunt-nosed section of a supersonic rocket which is made from subliming ablative material. Ablation analyses are performed for the nose section because nose recession is very important for a rocket to follow the desired trajectory and nose temperature is very important for the avionics in the inner side of the nose. By using the developed algorithm, under aerodynamic heating, shape change and temperature distribution of the nose section at the end of the flight are obtained. Moreover, effects of ablation on the trajectory of the rocket and on the flow around the rocket are examined by Missile DATCOM and CFD (computational fluid dynamics) analysis tools.
9
Dilwith, Jason. "Feasibility Study of Laser Ablation using Long Pulsed 300W, CW Single Mode Fiber Laser". NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-06132005-191622/.
Many applications now require micro sized holes that are difficult to produce with conventional methods. The entrance of lasers in the industry has brought about a better method for producing these holes. However the ultra-short pulse lasers that are normally used are extremely expensive and require many pulses to remove the material due to the small amount of energy they deposit. The objective of this research is to examine the feasibility of laser ablation using a 300W, CW Single Mode fiber laser which has high continuous power output for each pulse and has excellent beam quality. The results show that laser ablation occurs when a 100mm lens is used with pulse durations at 40 microseconds or below. Using one 18 microsecond pulse, a blind hole of 43.6 microns in diameter and 23.6 microns in depth with an aspect ratio of 0.54 can be created with little heat affected zone. This performance is comparable to nanosecond lasers, but with much higher hole depth per pulse. It was also found that the pulse duration must be short enough so that the ablating effect of the initial spike of an enhanced pulse is not nullified due to melting. At longer pulse durations (50 microseconds or more), raised surfaces are created instead of holes.
10
Ortiz, Luis G. "Design of a chemical sampling and analysis system using excimer laser ablation and quartz microcolumns". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43422.
Caricato, Anna Paola, e Ion N. Mihailescu. Pulsed Laser Ablation: Advances and Applications in Nanoparticles and Nanostructuring Thin Films. Jenny Stanford Publishing, 2018.
Caricato, Anna Paola, e Ion N. Mihailescu. Pulsed Laser Ablation: Advances and Applications in Nanoparticles and Nanostructuring Thin Films. Jenny Stanford Publishing, 2018.
Caricato, Anna Paola, e Ion N. Mihailescu. Pulsed Laser Ablation: Advances and Applications in Nanoparticles and Nanostructuring Thin Films. Jenny Stanford Publishing, 2018.
Wolf, Farrah J., e Jason Iannuccilli. Percutaneous Thermal Ablation: Hydrodissection and Balloon Displacement to Protect Adjacent Non-Target Critical Structures. A cura di S. Lowell Kahn, Bulent Arslan e Abdulrahman Masrani. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199986071.003.0071.
This chapter describes techniques that may be utilized to protect soft tissue structures and vessels that lie less than 1 cm from the planned ablation zone from thermal injury. Hydrodissection with dextrose 5% in water combined with non-ionic contrast material may be used as a means of providing mechanical displacement. Alternatively, an angioplasty balloon inflated with air may be used to provide both physical displacement and thermal insulation. This chapter provides an overview of the percutaneous image-guided thermal ablation technique as well as clinical examples, including microwave ablation of a renal cell carcinoma and radiofrequency ablation of a hepatocellular carcinoma, utilizing hydrodissection and balloon displacement techniques.
7
Clavin, Paul, e Geoff Searby. Combustion Waves and Fronts in Flows: Flames, Shocks, Detonations, Ablation Fronts and Explosion of Stars. Cambridge University Press, 2016.
Clavin, Paul, e Geoff Searby. Combustion Waves and Fronts in Flows: Flames, Shocks, Detonations, Ablation Fronts and Explosion of Stars. Cambridge University Press, 2016.
Clavin, Paul, e Geoff Searby. Combustion Waves and Fronts in Flows: Flames, Shocks, Detonations, Ablation Fronts and Explosion of Stars. Cambridge University Press, 2016.
Sanders, Prashanthan, Pierre Jaïs, Glenn D. Young, Frédéric Sacher, Martin Rotter, Mélèze Hocini, Li-Fern Hsu et al. "Atrial Mechanical Function after Atrial Fibrillation Ablation". In Catheter Ablation of Atrial Fibrillation, 225–32. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444300185.ch16.
Crossman, Samuel Henry, Mitra Amiri Khabooshan, Sebastian-Alexander Stamatis, Celia Vandestadt e Jan Kaslin. "Mechanical Ablation of Larval Zebra Fish Spinal Cord". In Methods in Molecular Biology, 47–56. New York, NY: Springer US, 2023. http://dx.doi.org/10.1007/978-1-0716-3585-8_3.
Auth, David C. "Introduction: Angioplasty with High Speed Rotary Ablation". In Restenosis after Intervention with New Mechanical Devices, 275–88. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2650-2_17.
Bertrand, Michel E., Jean M. Lablanche, Fabrice Leroy, Christophe Bauters, Peter De Jaegere, Patrick W. Serruys, Jurgen Meyer, Ulrich Dietz e Raimund Erbel. "Percutaneous Transluminal Coronary Rotary Ablation with Rotablator: European Experience". In Restenosis after Intervention with New Mechanical Devices, 289–96. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2650-2_18.
Peterson, Kirk L., Isabel Rivera, Martin McDaniel, John Long, Allan Bond e Mikki Bhargava. "Percutaneous Transluminal Coronary Rotational Ablation: Serial Follow-up by Quantitative Angiography". In Restenosis after Intervention with New Mechanical Devices, 313–28. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2650-2_20.
Avishek, Shubhamshree, e Sikata Samataray. "Sensitivity Analysis of Critical Parameters Affecting the Efficacy of Microwave Thermal Ablation on Lungs". In Lecture Notes in Mechanical Engineering, 293–303. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4795-3_28.
Baumbach, Andreas, Karl K. Haase e Karl R. Karsch. "Direct Laser Ablation of Coronary Atherosclerotic Plaque in Humans — The German Experience". In Restenosis after Intervention with New Mechanical Devices, 485–95. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2650-2_29.
Esenaliev, R. O., R. Jahn, V. S. Letokhov, W. Neu, R. Nyga e B. Tschirner. "Mechanical and Acoustic Effects Induced by Laser Ablation of Biological Tissue". In Laser in der Medizin / Laser in Medicine, 306. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-93548-0_67.
Yock, Paul G., Peter J. Fitzgerald, Krishnankutty Sudhir, Victor K. Hargrave e Thomas A. Ports. "Ultrasound Guidance for Catheter-based Plaque Removal and Ablation Techniques: Potential Impact on Restenosis". In Restenosis after Intervention with New Mechanical Devices, 97–110. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2650-2_6.
Vignoles, G. L., J. Lachaud, Y. Aspa e M. Quintard. "Effective Surface Recession Laws for the Physico-Chemical Ablation of C/C Composite Materials". In Mechanical Properties and Performance of Engineering Ceramics and Composites V, 351–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470944127.ch33.
Anzalone, R., B. W. Barr, R. R. Upadhyay e O. A. Ezekoye. "Use of a Quasi-Steady Ablation Model for Design Sensitivity With Uncertainty Propagation". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63677.
Sensitivity analysis and design calculations are often best performed using low-order models. This work details work done on adding complementary pieces to a low-order, quasi-steady-state ablation model to facilitate uncertainty propagation. The quasi-steady-state ablation model is a one-dimensional, quasi-steady-state, algebraic ablation model that uses finite-rate surface chemistry and equilibrium pyrolysis-gas-production submodels to predict surface recession rate. The material response model is coupled to a film-transfer boundary layer model to enable the computation of heat and mass transfer from an ablating surface. For comparison to arc jet data, a simple shock heated gas model is coupled. A coupled model consisting of submodels for the shock heated gases, film heat and mass transfer, and material response is exercised against recession rate data for surface and in-depth ablators. Comparisons are made between the quasi-state-state ablation model and the unsteady ablation code, Chaleur, as well as to other computations for a graphite ablator in arcjet facilities. The simple models are found to compare reasonably well to both the experimental results and the other calculations. Uncertainty propagation using a moment based method is presented. The results of this study are discussed, and conclusions about the utility of the method as well as the properties of the ablation code are drawn.
2
Wang, Yeqing, Olesya I. Zhupanska e Crystal L. Pasiliao. "Verification of a Manual Mesh Moving Finite Element Analysis Procedure for Modeling Ablation in Laminated Composite Materials". In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70623.
One of the prevalent approaches to model ablation problems is to use the UMESHMOTION subroutine and the Arbitrary Lagrangian-Eulerian (ALE) adaptive remesh algorithm in ABAQUS (i.e., a commercial, general purpose Finite Element Analysis (FEA) software). However, the approach is not applicable for ablation problems when the material removal proceeds from one material domain to another, such as for ablations of laminated composite materials when the surface recedes from one laminate layer to another layer with different material orientations. In this paper, a novel procedure, based on manual mesh moving FEA with ABAQUS, is proposed to solve the ablation problems for laminated composite materials. The proposed procedure is verified by comparing the predictions of temperature and ablation histories of a two-dimensional isotropic panel (i.e., with single material domain) with those obtained using the traditional UMESHMOTION+ALE method. In addition, a case study is presented to demonstrate the successful application of the proposed procedure for the prediction of the thermal and ablation response of a laminated carbon fiber reinforced epoxy matrix (CFRP) composite panel subjected to a high-intensity and short-duration radiative heat flux.
3
Wang, Yeqing, Daniel Diaz e David W. Hahn. "Ablation Characteristics of Nanosecond Laser Pulsed Ablation of Aluminum". In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87635.
This research presents laser ablation characteristics of an aluminum alloy after nanosecond pulsed laser ablation (PLA) with a 1064 nm Nd:YAG laser. White light interferometry and scanning electron microscopy were used to establish relationships between laser ablation characteristics and the number of pulses at different beam energies. Laser ablation features studied in this research are crater profiles, radii and depth, and extent of surface damage. An extensive damaged area around the laser ablation crater was found and is believed to be produced by the laser-induced plasma generated during PLA. Spectroscopic analysis showed that there is a correlation between the plasma formation threshold and the initiation of the plasma-affected area, and laser ablation at different angles of incidence between the beam and the sample showed a correlation between the plasma shape and the shape of the damaged area around the ablation crater. However, the variables influencing the occurrence of the plasma-affected and the extent of plasma-induced damage are not yet fully recognized and understood.
4
Girard, Bruno, Kresimir Franjic, Martin Cloutier, David Wilson, Cameron M. L. Clokie, Brian C. Wilson e R. J. Dwayne Miller. "Bone surgery with femtosecond laser compared to mechanical instruments: healing studies". In High-Power Laser Ablation 2006, a cura di Claude R. Phipps. SPIE, 2006. http://dx.doi.org/10.1117/12.669606.
Ulucakli, M. Erol, e Evan P. Sheehan. "Treatment of Arrhythmias by Radiofrequency Ablation". In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63360.
Radiofrequency ablation may be described as a thermal strategy to destroy tissue by increasing its temperature and causing irreversible cellular injury. Radiofrequency ablation is a relatively new modality which has found use in a wide range of medical applications and gained acceptance. RF ablation has been used to destroy tumors in the liver, prostate, breasts, lungs, kidneys, bones, and eyes. One of the early clinical applications was its use in treating supraventricular arrhythmias by selectively destroying cardiac tissue. Radiofrequency ablation has become established as the primary modality of transcatheter therapy for the treatment of symptomatic arrhythmias. Radiofrequency catheter ablation of cardiac arrhythmias was investigated using a finite-element based solution of the bioheat transfer equation. Spatial and temporal temperature profiles in the cardiac tissue were visualized.
6
Ulucakli, M. Erol. "Radiofrequency Catheter Ablation of Cardiac Arrhythmias". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64809.
Radiofrequency ablation could be described as a thermal strategy to destroy a tissue by increasing its temperature and causing anirreversible cellular injury. Radiofrequency ablation is a relatively new modality which has found use in a wide range of medical applications and gained acceptance. RF ablation has been used in destroying tumors in liver, prostate, breast, lung, kidney, bones, and the eye. One of the early applications in clinical setting was its use in treating supraventricular arrhythmias by selectively destroying cardiac tissue. Radiofrequency ablation has become established as the primary modality of transcatheter therapy for the treatment of symptomatic arrhythmias. Radiofrequency catheter ablation of cardiac arrhythmias were investigated using a finite-element based solution of bioheat transfer equation. Spatial and temporal temperature profiles in the cardiac tissue were visualized.
7
Bakshi, Saurabh, Sijia Guo e Xiaoning Jiang. "Multi-Frequency Focused Ultrasound for Tissue Ablation". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64076.
In this study, the effectiveness of tissue ablation was investigated using multi-frequency high intensity focused ultrasound (HIFU) transducers (950 kHz, 1.5 MHz). Temperature rise and lesion volume were recorded when chicken tissue was ablated by focused ultrasound (FUS) with controlled ultrasound power and exposure time using single frequency and multi-frequency modes. It was found that multi-frequency tissue ablation gives a higher maximum temperature accompanied by a faster rise, and a larger ablation lesion volume, compared with single frequency ablation, under the same input conditions of electrical power, exposure time and depth of focus. Also, it was concluded that the same desired tissue temperature and ablation lesion conditions can be attained by using less power for the multi-frequency ablation. These findings are promising because the multi-frequency ultrasound ablation using FUS with a greater frequency difference could result in promising imaging guided effective therapy using one multi-frequency probe.
8
Yu, Kaihong, Ren Takahashi e Makoto Ohta. "Development of the Working Fluid With Blood Viscosity for Evaluating Ablation Catheter in In Vitro System". In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65975.
The purpose of this study was to develop a working fluid with the proper viscosity to mimic blood flow to evaluate an ablation catheter. We proposed a working fluid that matches the blood viscosity, using glycerol-saline solution or xanthan gum (XG)-saline solution. We compared the two solution mixtures at various concentrations (for glycerol-saline solution, 10%, 30%, and 50%; for XG-saline solution, 0.10%, 0.11%, 0.12%, and 0.13%) by measuring their temperature dependence on viscosity. To test the developed working fluids, RF ablations were performed with both solutions, and the flow around the catheter during ablation was observed by particle image velocimetry (PIV) method. In addition, to test the efficacy of the solution mixtures, myocardium was observed after it was soaked separately in the two solution mixtures. The viscosity of both kinds of solution mixtures increased at higher concentrations and decreased with increasing temperatures. At 37°C, the viscosities of 50% glycerol-saline solution and 0.11%–0.13% XG-saline solution were 3–4 mPa·s, a value that is similar to the viscosity of blood. The upward flow resulting from heat convection by ablation was observed around the catheter in the PIV analysis using an in vitro model without flow. The solution mixture with the higher viscosity flowed at a lower velocity around the catheter, and the myocardium soaked in 50% glycerol-saline solution shrunk into a black and tough tissue. On the other hand, the myocardium soaked in XG-saline solution showed no change in color or shape. In conclusion, the XG-saline solution is a superior option for evaluating ablation catheters.
9
Satish, Vellavalapalli, Jatin Kumar e Ramjee Repaka. "Analysis of Ablation Volume Produced During Microwave Ablation of Breast Cancerous Lesion Using Fourier and Non-Fourier Models". In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10800.
Abstract The present article aims to compare the change in the temperature and ablation volume during Microwave ablation procedure. The microwave ablation process is carried out using Fourier and non-Fourier bioheat transfer models in the computational domain of breast tumor. The above models have been considered with the relaxation time known as thermal delay during ablation procedure at constant power and frequency. The above objective has been carried out on a heterogeneous three compartment Breast model using COMSOL-Multiphysics software, with inbuilt bioheat transfer and electromagnetic waves Physics interfaces. The simulation results show that the ablation volume is slightly greater while using Fourier bioheat transfer model as compared to the non-Fourier bioheat transfer model. Further, the temperature distribution also shows that there is a slight variation initially at the start of the ablation, i.e., Fourier heat transfer model shows nearly 2°C more temperature as compared to the non Fourier model and becomes equal as the time increases. The present study helps in establishing the better clinical procedure of Microwave Ablation technique.
10
Gosse, Ryan, e Edward Alyanak. "Micro-Mechanical Ablation of Carbon-Carbon Materials". In 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-1564.
Rapporti di organizzazioni sul tema "Mechanical ablation":
1
Hogenes, Annemiek, Christiaan Overduin, Cornelis Slump, Cornelis van Laarhoven, Jurgen Fütterer, Richard ten Broek e Martijn Stommel. The Influence of Irreversible Electroporation Parameters on the Size of the Ablation Zone and Thermal Effects: a Systematic Review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, marzo 2022. http://dx.doi.org/10.37766/inplasy2022.3.0161.
Review question / Objective: The aim of this study was to review the effect of irreversible electroporation (IRE) parameter settings on the size of the ablation zone and occurrence of thermal effects. Information sources: A search was performed in PubMed (also including MEDLINE), Web of Science, Embase, Institute of Electrical and Electronics Engineers (IEEE) Xplore Digital Library and American Society of Mechanical Engineers (ASME) Digital Collection. Of all conference abstracts of which no full text article was present in the title and abstract search, a web-based search (Google Scholar, ResearchGate, author and co-author name(s) in Embase) was done to investigate whether a full text article was available. A manual search of the reference lists of relevant (included) articles was performed to find articles which were not found by the initial search. The corresponding author was approached by e-mail (in case the contact details were available) when the full text of a relevant abstract (e.g. conference abstract) could not be found to verify whether the results were published as full text. The study was excluded when the full text could not be found or provided.
