Tesis sobre el tema "Flexible endoscopy"
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Mutschler, Klaus [Verfasser] y Roland [Akademischer Betreuer] Zengerle. "Needle-free trans-endoscopic micro injection for flexible endoscopy". Freiburg : Universität, 2017. http://d-nb.info/1168145686/34.
Texto completoHale, Melissa F. "Magnetically assisted capsule endoscopy : a viable alternative to conventional flexible endoscopy of the stomach?" Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/14282/.
Texto completoMertens, Benjamin. "Bringing 3D and quantitative data in flexible endoscopy". Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209275.
Texto completoIn this thesis, a contribution to more a robust 3D reconstruction endoscopic device is proposed. Structured light technique is used and implemented using a diffractive optical element. Two patterns are developed and compared: the first is based on the spatial-neighbourhood coding strategy, the second on the direct-coding strategy. The latter is implemented on a diffractive optical element and used in an endoscopic 3D reconstruction device. It is tested in several conditions and shows excellent quantitative results but the robustness against bad visual conditions (occlusions, liquids, specular reflection,) must be improved.
Based on this technology, an endoscopic ruler is developed. It is dedicated to answer endoscopists lack of measurement system. The pattern is simplified to a single line to be more robust. Quantitative data show a sub-pixel accuracy and the device is robust in all tested cases. The system has then been validated with a gastroenterologist to measure polyps. Compared to literature in this field, this device performs better and is more accurate.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Despott, Edward. "Advancing minimally invasive aspects of flexible gastrointestinal endoscopy". Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/25139.
Texto completoGong, Feng. "Design, development and testing of miniature instruments for flexible endoscopy". Thesis, University College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322407.
Texto completoHan, Zhimin. "Hyperspectral endoscopy imaging: system development, clinical evaluation, and further application". Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55026.
Texto completoNishime, Thalita Mayumi Castaldelli. "Development and characterization of extended and flexible plasma jets /". Guaratinguetá, 2019. http://hdl.handle.net/11449/190654.
Texto completoResumo: Nos últimos anos, tem intensificado o emprego de plasmas em pressão atmosférica para diferentes aplicações. Com o desenvolvimento dos jatos de plasma em pressão atmosférica, alguns tratamentos precisos, como no campo biomédico ou em específicos processamentos de superfícies, tornaram-se mais frequentes. No entanto, a aplicação de plasma à objetos irregulares, dentro de tubos ou mesmo dentro de órgãos ocos é limitada quando se utilizam configurações convencionais de jatos de plasma. Portanto, essas limitações podem ser superadas com o desenvolvimento de jatos de plasma alongados ou gerados remotamente. Neste trabalho, duas configurações de jato de plasma longo visando diferentes campos de aplicação foram aperfeiçoadas e caracterizadas. Inicialmente foi desenvolvido um jato de plasma endoscópico (plasma endoscope) operando em configuração de descarga por barreira dielétrica (DBD) com dimensões milimétricas, versátil ao acoplamento em endoscópios típicos. Este jato de plasma pode operar com hélio ou neônio e conta com um canal externo e concêntrico de gás que permite a introdução de uma cortina de gás eletronegativo ao redor da pluma de plasma. A cortina de proteção a gás preserva a forma do jato de plasma quando operado dentro de cavidades fechadas. As dificuldades advindas do desenvolvimento deste foram investigadas quando diferentes gases foram testados como cortina de proteção dele, dentre estes, o dióxido de carbono se mostrou uma boa opção evitando a formação de descargas ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The use of atmospheric pressure plasmas for different purposes has increased in recent years. With the development of atmospheric pressure plasma jets, some precise treatments such as in the biomedical field or specific surface processing became more often. However, the delivery of plasma to irregular shaped objects, inside tubes or even hollow organs is limited with the use of conventional plasma jet configurations. Therefore, those limitations can be surpassed with the development of elongated or remotely generated plasma jets. In this work, two extended plasma jet configurations aiming at different application fields were further developed and characterized. Firstly, an endoscopic plasma jet (plasma endoscope) operating with a dielectric barrier discharge (DBD) configuration in millimeter dimensions that can be coupled to a typical endoscope was developed. This plasma jet can operate with helium or neon and counts with an external concentric shielding gas channel that provides the introduction of an electronegative gas curtain around the plasma plume. The shielding gas allows the preservation of the plasma jet shape when operated inside closed cavities. The construction difficulties arisen from the use of different feed and shielding gases were explored. Carbon dioxide was proven to be a good option for the curtain gas around the plasma plume avoiding the formation of parasitic discharges inside the shielding gas tube and the endoscopic housing. When operated with neon, th... (Complete abstract click electronic access below)
Doutor
Cauche, Nicolas. "Conception et modélisation d'une plateforme flexible d'endoscopie digestive". Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/247639.
Texto completoDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Choi, JungHun. "Design and Development of a Minimally Invasive Endoscope: Highly Flexible Stem with Large Deflection and Stiffenable Exoskeleton Structure". Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/26218.
Texto completoPh. D.
Ducourthial, Guillaume. "Développement d'un endomicroscope multiphotonique compact et flexible pour l'imagerie in vivo haute résolution de tissus biologiques non marqués". Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0004/document.
Texto completoMultiphoton microscopy is an essential investigative tool in cell and tissue biology. Its extension to endoscopy is the subject of intensive research for applications in neuroscience (brain imaging of small animals) or clinical (early diagnosis, help for biopsy). This manuscript focuses on the development of an endomicroscope with multiphoton unprecedented performance. This device is powered by a standard titanium-sapphire oscillator. Then comes a pre-compensation module of linear and nonlinear distortions occurring in the endoscopic fiber. This module provides compressed pulses of 39 fs at the direct output of 5 meters long innovative double-clad air-silica microstructured fiber which is optimized for multiphoton excitation (polarization maintaining central core of 3.4 µm) and the collection of the signal produced by biological targets. At the end of the fiber, there is an endoscopic probe, 2.2 mm in diameter and 37 mm long, composed of a micro fiber scanning system and an achromatic micro-objective with a working distance greater than 400 µm. The spatial resolution of the device is 0.83 µm and the acquisition is done simultaneously on two spectral channels at 8 frames/s. The device has recorded in vivo images without label of the tubules and the renal capsule, respectively by two-photon excitation fluorescence of flavins and second harmonic generation of collagen, with 30 mW on the tissues and 300 µm below the surface of the organ
Hou, Yingfan. "Apport de la combinaison de méthodes de mesure de formes tridimensionnelles dans le contexte de l'endoscopie flexible". Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2255/document.
Texto completoThe techniques of three dimensional shapes reconstruction are widely used in many fields, particularly in the industrial or medical field. And in these areas, non-contact measurement techniques are particularly studied, mainly because they don't damage the measured object. This work therefore falls within this context and in particular in the case of endoscopic devices of surface coordinate measuring by optical methods. ln the medical field, this type of instrument can be applied to 3D colonoscopy or minimally invasive surgery to the surface in the form of biological tissues. In this thesis, methods based on active or passive stereo vision are the principle, which will be studied and integrated into a miniaturized device. Different measurement modes will be incorporated simultaneously into a single miniaturized instrument to help increase measurement performance: the instrument can adjust its measurement principle to the texture of the object or also to the orientation of measured surfaces more generally to the context of the measurement. This thesis is based on an algorithmic study and instrumental integration of these different measurement modes into a single miniaturized endoscopic instrument. The study of the measurement modes stereovision was conducted in three phases. First, it is the influence of the orientation of the measured objects' surface in a case of active stereovision being analyzed. And a technique of switching between the projection and acquisition in an active stereovision system by bistable actuation is proposed, which allows to adapt the measurement to the orientation of the measured surfaces. Finally, the study is oriented towards the ability to switch from one active stereovision mode to one passive stereovision mode, always by bistable actuator operation, the passive stereovision mode is particularly suitable for highly textured objects. Thus, three measurement modes are made in the new system: two modes of active stereovision (reversing capture and projection channels) and a mode of passive stereovision. To achieve three-dimensional reconstruction, two active methods (phase shift and Fourier Transform) and a passive method are studied. Different performance measurements are obtained according to methods selected: a more accurate measuring result is obtained by the phase shift methods; a high measurement speed is obtained by the Fourier transform methods or by passive methods. The instrumental development is also described in this thesis. After optical modeling and mechanical design of the measuring system, a prototype of the endoscopic instrument is manufactured with various specific devices such as a DMD (Digital Micromirror Deviee),images guides and bistable electromagnetic actuators. The experimental validation of the three-dimensional measurement is performed mainly on mechanical objects (such as details measurement on a coin), both active and passive method methods are well tested and compared. Finally, an artificial colon is measured by this system to be placed in a medical application context
Caravaca, Mora Oscar Mauricio. "Development of a novel method using optical coherence tomography (OCT) for guidance of robotized interventional endoscopy". Thesis, Strasbourg, 2020. http://www.theses.fr/2020STRAD004.
Texto completoThere exists an unmet clinical need to provide doctors with a new method that streamlines minimally invasive endoscopic treatment of colorectal cancer to single operator procedures assisted by in-situ and real-time accurate tissue characterization for informed treatment decisions. A promising solution to this problem has been developed at the ICube laboratory, in which the flexible interventional endoscope (Karl Storz) was completely robotized, so allowing a single operator to independently telemanipulate the endoscope and two insertable therapeutic instruments with a joint control unit. However, the robot-assisted flexible endoscope is subject to the same diagnostic accuracy limitations as standard endoscopy systems. It has been demonstrated that endoscopic optical coherence tomography (OCT) has a good potential for imaging disorders in the gastrointestinal tract and differentiating healthy tissue from diseased. Neither OCT, nor the robotized endoscope can solve the limitations of current standard of care for colon cancer management alone. Combining these two technologies and developing a new platform for early detection and treatment of cancer is the main interest of this work, with the aim of developing a state-of-the-art OCT imaging console and probe integrated with the robotized endoscope. The capabilities of this new technology for imaging of the interior of the large intestine were tested in pre-clinical experiments showing potential for improvement in margin verification during minimally invasive endoscopic treatment in the telemanipulation mode
Weber, Niklas [Verfasser] y Hans [Akademischer Betreuer] Zappe. "Highly flexible micro-bench system for endoscopic micro-probes = Hoch flexibles Mikrobank-System für endoskopische Mikrosonden". Freiburg : Universität, 2013. http://d-nb.info/1123476020/34.
Texto completoCabras, Paolo. "3D Pose estimation of continuously deformable instruments in robotic endoscopic surgery". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAD007/document.
Texto completoKnowing the 3D position of robotized instruments can be useful in surgical context for e.g. their automatic control or gesture guidance. We propose two methods to infer the 3D pose of a single bending section instrument equipped with colored markers using only the images provided by the monocular camera embedded in the endoscope. A graph-based method is used to segment the markers. Their corners are extracted by detecting color transitions along Bézier curves fitted on edge points. These features are used to estimate the 3D pose of the instrument using an adaptive model that takes into account the mechanical plays of the system. Since this method can be affected by model uncertainties, the image-to-3d function can be learned according to a training set. We opted for two techniques that have been improved : Radial Basis Function Network with Gaussian kernel and Locally Weighted Projection. The proposed methods are validated on a robotic experimental cell and in in-vivo sequences
Ott, Laurent. "Compensation des mouvements physiologiques en endoscopie flexible : application à la chirurgie transluminale". Strasbourg, 2009. http://www.theses.fr/2009STRA6233.
Texto completoTransluminal surgery, also called NOTES (Natural Orifice Transluminal Endoscopic Surgery), consists of accessing the peritoneal cavity by passing through a natural orifice and then to make an opening in an inner wall to accomplish treatments. Conventional flexible endoscopes used nowadays to perform these procedures have a distal bending tip controlled by two navigation wheels located on the handle. They also provide a visual feedback from an optical system (CCD camera) embedded at the tip of the endoscope. These tools are quite awkward for the surgeons as the control interface is non intuitive and the visibility is poor. In order to supply a robotic assistance to the praticians during flexible endoscopy interventions, we have developed an automated positioning system of the endoscope tip. The objective is to realize a virtual link between the tip of the endoscope and an anatomical target despite the physiological motions, the interaction of the instruments with the environment and the manually controlled forward/backward motion of the endoscope. The pratician can thereby focus on the manipulation of the endoscopic tools while the bending section compensate the occurring disturbances. The virtual link between the tip and the anatomical target is performed using a 2D visual servoing scheme in association with the selection of relevant visual features
HARMON, AMY L. "PEDIATRIC DYSPHAGIA: A RETROSPECTIVE STUDY OF PATIENTS RECEIVING FLEXIBLE ENDOSCOPIC EVALUATION OF SWALLOWING (FEES)". University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1022258117.
Texto completoHarmon, Amy L. "Pediatric dysphagia a retrospective study of patients receiving flexible endoscopic evaluation of swallowing (FEES) /". Cincinnati, Ohio : University of Cincinnati, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1022258117.
Texto completoKatkam, Rajender. "Dual field of view optical system for colonoscope". Thesis, The University of Arizona, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1564291.
Texto completoThe present dual field of view flexible colonoscope can provide both forward view and radial or backward view of the colon to improve detection of cancerous polyps. The colonoscope has its own illumination that illuminates the parts of the colon viewed by imaging optics. The optical system, limited only by the diffraction effects at the exit pupil over the entire visible spectrum, can provide high resolution and is suitable for color imaging. The flexible colonoscope has an on-board sensor at the proximal end of the colonoscope to improve resolution. The proximal end of colonoscope measures only 8 mm in diameter and 20 mm in length. The present colonoscope has the potential to be scaled down to as small as 6 mm inner diameter from the present 8 mm.
Matthias, Steffen Felix [Verfasser]. "A flexible endoscopic structured light 3-D sensor: Design, models and image processing / Steffen Felix Matthias". Garbsen : TEWISS - Technik und Wissen GmbH, 2019. http://d-nb.info/1187277967/34.
Texto completoMatthias, Steffen [Verfasser]. "A flexible endoscopic structured light 3-D sensor: Design, models and image processing / Steffen Felix Matthias". Garbsen : TEWISS - Technik und Wissen GmbH, 2019. http://nbn-resolving.de/urn:nbn:de:101:1-2019052812071833963147.
Texto completoMelo, Luciano Cavalheiro. "Videolaparoscopia flexível por acesso único via fossa paralombar utilizando cânula óptica longa com espiral na exploração abdominal de equinos em estação". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/165388.
Texto completoLaparoscopy is a minimally invasive surgical technique by using a laparoscope inserted through the abdominal wall where it is visually possible to inspect visceral surfaces and peritoneum, and to perform surgical procedures. Up to now, diagnostic laparoscopy in standing horses through the paralumbar fossa requires two procedures to be performed (one on each side of the animal) in order to significantly see the peritoneal cavity, in addition of using specific laparoscope. With the purpose to develop a diagnostic laparoscopy in standing horses through a single access, a trocarless threaded visual cannula 60 cm length was designed with the aim to promote higher safety to laparoscopic access (radial penetration without trocar and under visualization), and support to a flexible endoscope so that a significant exploration of both dorsal abdominal hemispheres through only one of the paralumbar fossa is possible to perform. Six mature horses were used: three males and three females. Food was withheld for 24 to 30 hours before surgery. Blood samples to perform complete blood count and fibrinogen metering were obtained in D-Pre, D4, and D7. The horses were sedated with detomidine hydrochloride, followed by local anesthesia blockade with lidocaine hydrochloride infused in the muscle and subcutaneous tissue at the incision place in the center of the paralumbar fossa. The surgical procedure started with a skin incision of nearly 2 cm length. Muscle layers of the region were moved away through clockwise cannula rotation and the distancing of the tissues were followed by images produced by the flexible endoscope and played on the monitor. After the peritoneum perforation, the cavity exploration was started. After the ipsilateral side exploration to the access site, the transposing of the set cannula/endoscope was performed ventrally to the rear portion of the descending colon followed by the contralateral side exploration. When the examination was finished, the set was removed through counterclockwise cannula rotation and the skin incision was stitched to the subcutaneous. Moving the cannula among the abdominal organs was shown to be safe; however, spleen iatrogenic injury in two animals was highlighted by minor local hemorrhage. The majority of the abdominal structures described in the literature was possible to identify through the laparoscopic procedure in standing horses by single access. There was subcutaneous emphysema formation adjoining the surgical wounds in five of the six animals. The hematological parameters of the animals were kept in the limits established for the species, with exception of total leucocytes, segmented neutrophils and fibrinogen which showed small variations. The proposed approach was shown to be feasible and has the potential to make the procedure faster, more practical and safe and less invasive and expensive, fostering the diagnostic laparoscopy application in the equine species.
Merini, Luciana Paula. "Modelo de cânula vaginal na endoscopia transluminal por orifícios naturais (NOTES) pelo acesso transvaginal com extração ovariana (NOSE) em éguas hígidas". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/168826.
Texto completoThe technique of Natural Orifice Transluminal Endoscopic Surgery (NOTES), by definition, concerns the introduction of an endoscope in the abdominal cavity through an intentional perforation of a viscera (for ex., stomach, recto, vagina) and performs an intra-abdominal exploration and/or operation. The surgical incision performed through the NOTES technique has the benefit of being used to remove resected specimens (NOSE) from the abdominal cavity through a standard laparoscopy or through NOTES. The present study had the purpose to check the practicality of the vaginal cannula in performing transvaginal access to the abdominal cavity through the NOTES technique in standing healthy mares and assess the vaginal access as an canal extraction of specimens (NOSE) in mares subjected to laparoscopic ovariectomy. Six healthy mares were used for both surgical procedures. The food was withheld between 24 to 30 hours before surgery. They were sedated with detomidine hydrochloride and to perform the low epidural, lidocaine hydrochloride was used. The vaginal incision was performed dorsally to the cervix at 12 o’clock position using threaded round tip vaginal cannula and performed under indirect viewing through a flexible endoscope inserted in the cannula. The ovaries were removed through the vagina in four of the six mares used in the experiment. From the four mares, three were required to manually increase the colpotomy for manual intracavitary seizure of the ovaries and their removal. In two of the animals, the ovaries had to be cut and removed through the flank, increasing the incision of the laparoscopic working channel. The procedure to create the access to the abdominal cavity through the vagina to perform the NOTES technique and the specimen extraction technique through NOSE subjected to laparoscopic ovariectomy in healthy mares did not demonstrate high difficulties in its execution nor post-surgical complications, confirming the practicality of the two techniques in the equine species.
Liu, Ning. "Modélisation Hamiltonienne à ports et commande distribuée de structures flexibles : application aux endoscopes biomédicaux à actionneurs à base de polymère électro-actif". Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCD054.
Texto completoThis thesis deals with the multiphysical modeling and the distributed control of flexible structures actuated by Ionic Polymer Metal Composite (IPMC) actuators. We firstly propose a model for the IPMC actuator using infinite dimensional port-Hamiltonian formulations in order to tackle the multiphysical and multiscale couplings. Lagrange multipliers are used to handle the mechanical constraints appearing in the actuator. The mechanical structure of the flexible structure is then modeled in 1D with beam models and in 2D with a thin shell model. Secondly, two structure preserving discretization methods are presented and extended to infinite dimensional dissipative port-Hamiltonian system with distributed input. The proposed IPMC actuator model is then discretized using the structure preserving finite differences method on staggered grids and validated on experimental data. Thirdly, we propose an in-domain distributed control law on a simplified model i.e. the vibrating string actuated with patches, that allows to shape the total energy of the system and to inject damping in order to stabilize the overall system with predefined performances
Satoh, Asako Kaneoka. "Laryngeal sensory testing using flexible endoscopy". Thesis, 2016. https://hdl.handle.net/2144/19552.
Texto completo2017-11-07T00:00:00Z
Kukuk, Markus [Verfasser]. "A model-based approach to intraoperative guidance of flexible endoscopy / von Markus Kukuk". 2002. http://d-nb.info/967537665/34.
Texto completoAltanbagana, Zolzaya. "ZA Medical Ultrafiltration for Flexible Endoscope Reprocessor Business Plan in Mongolia". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/t346f6.
Texto completo國立臺北科技大學
管理學院外國學生專班(IMBA)
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ZA - Medical is a start-up guided by Zolzaya Altanbagana, graduate of the International Business Administration at the National Taipei University of Technology. The start-up is a young company that one want to make a difference in order to contribute to make the world more beautiful. This is done among others by the implementation of the by Kate Raworth Donut Economy thought. With the first innovation of the company, is deployed on the saving energy and water combined with a pursuit of honesty rewards for stakeholders. In addition, a contribution is made to patient safety during endoscopic interventions. The above comes directly from the moonshot from Zolzaya. This research brings the market from chart endoscopy and the problems that occur in that market. An endoscope is a snake-shaped camera that allows in the body of the human can be looked at. The endoscopes are used after use washed with tap water and chemicals in special washing machines. The water filter that is used ensures still too often for problems. Through the usual microfiltration (MF) modules or UV lamps to be replaced with a filtration technique called ultrafiltration (UF), the start-up ensures it is excluded that water bacteria from the pipe network on a washed endoscope can end.
Guiqiu, Liao. "Analysis and correction of OCT images for the control of robotic flexible endoscopes". Doctoral thesis, 2022. https://hdl.handle.net/11562/1084166.
Texto completo"Research, Design and Validation of a Cognitive Aid to Support the Reprocessing of Flexible Endoscopes". Master's thesis, 2011. http://hdl.handle.net/2286/R.I.9363.
Texto completoDissertation/Thesis
M.S. Applied Psychology 2011
Pisegna, Jessica Maxham. "Rethinking residue, an investigation of pharyngeal residue on flexible endoscopic evaluation of swallowing: the past, present, and future directions". Thesis, 2017. https://hdl.handle.net/2144/20892.
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