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Academic literature on the topic 'Prothèses internes – Analyse'
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Journal articles on the topic "Prothèses internes – Analyse"
Rol, Morgane, Luc Favard, and Julien Berhouet. "Analyse des facteurs influençant la rotation interne de l’épaule après mise en place d’une prothèse inversée." Revue de Chirurgie Orthopédique et Traumatologique 105, no. 8 (December 2019): 989–93. http://dx.doi.org/10.1016/j.rcot.2019.10.007.
Full textDissertations / Theses on the topic "Prothèses internes – Analyse"
Dumoulin, Christine. "Analyse et modélisation de comportements mécaniques des endoprothèses." Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX22093.
Full textAmblard, Anne. "Contribution à l'étude du comportement d'une endoprothèse aortique abdominale : analyse des endofuites de type I." Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0088/these.pdf.
Full textAbdominal aortic aneurysm disease is a degenerative process whose ultimate event is the rupture of the vessel wall. The endovascular approach suffers from problems such as endoleaks. We develop a non-invasive methodology to observe the contact between the endoprosthesis and the aorta wall. On the one hand, this study provides an evaluation of the stresses generated by the blood flow. As blood is a non-Newtonian fluid, we use the Phan-Thien and Tanner model, resulting from the polymer rheology. The application of this model gives the parietal shear stress and the first normal stress difference. On the other hand, we develop an axisymmetric finite-element model of the complete system. This model takes into account the viscoelastic behaviour of the aorta. Plast2, an explicit dynamic finite element code, is used to simulate the behavior of the system. The system is subject to hydrostatic pressure and to the stresses generated by the blood flow. A coupled fluid-structure interaction is achieved
Lethimonnier, Franck. "Evaluation des cardiopathies ischémiques par IRM quantification du flux et de la réserve coronaire : visualisation des sténoses par angiographie 3D : étude du retentissement fonctionnel par analyse de la fonction ventriculaire gauche." Angers, 1999. http://www.theses.fr/1999ANGE0508.
Full textBénard, Nicolas. "Analyse de l'écoulement physiologique dans un stent coronarien : Application à la caractérisation des zones de resténose pariétale." Phd thesis, Université de Poitiers, 2005. http://tel.archives-ouvertes.fr/tel-00012134.
Full textNotre étude vise donc à établir numériquement (à l'aide du logiciel Star-CD) et expérimentalement (par PIV et PSV) la topologie de l'écoulement intra stent, mais aussi à quantifier les niveaux de contraintes pariétales au sein du design, en écoulement newtonien et non newtonien. En préambule, une synthèse bibliographique des réponses des cellules constitutives de la paroi artérielle à différents niveaux de contrainte de cisaillement est proposée. La connaissance de ces réponses différenciées des cellules endothéliales et musculaires lisses permet alors de proposer une estimation des régions favorables à la resténose, via le calcul des contraintes de cisaillement qui leurs sont appliquées.
Notre étude paramétrique bidimensionnelle a permis de démontrer la prépondérance de la hauteur des branches sur les risques de resténose. Les résultats tridimensionnels permettent d'estimer les lieux d'une activité mitogénique potentiellement anormale, ainsi que le caractère non newtonien et quasi-stationnaire de l'écoulement intravasculaire au niveau de la paroi artérielle.
Yu, Boning. "Analyse de la fatigue, homogénéisation et optimisation de structures architecturées en titane obtenues par fabrication additive." Electronic Thesis or Diss., Reims, 2023. http://www.theses.fr/2023REIMS024.
Full textIn the design of lattice structures, understanding the material's elastic modulus and its fatigue performance is crucial to ensure the long-term stability of implants within the human body. The study of elastic modulus is particularly important as it effectively avoids stress shielding phenomena and enhances the load trans-fer capacity of the material. Additionally, the fatigue performance of implants during repetitive stress motion inside the human body is also of utmost significance.This study analyzed the elastic deformation behavior and high-cycle compression fatigue behavior of the mapped lattice structure of a rhombic dodecahedron used in medical bone im-plants fabricated through electron beam melting. The research developed analytical and finite element models to estimate the compressive elastic modulus and Poisson's ratios of mapped cellular rhombic dodecahedron structures with and without border constraints. The mapping function x→αx was used to map strut coordinates, causing changes to strut section and position while maintaining porosity. The study investigated compressive elastic modulus, Poisson's rati-os, high-cycle compression-compression fatigue response, and the effect of cryogenic treatment on Ti6Al4V samples.The mechanical properties of the Ti6Al4V rhombic dodecahedron lattice structure showed significant improvement as the mapping ratio α decreased. The equivalent elastic modulus of the cell is related to the number of periodic arrays of single cells under the condition of no boundary constraints. The modulus value increases monotonically with the number of cells and the diameter of the struts, but the range of increase approaches a limit as the number of cells tends to infinity.The influence of cryogenic treatment on the mechanical properties of the specimens and the fatigue fracture mechanism of the struts were analyzed through microstructure characterization. Cryogenic treatment enhanced elastic modulus, compressive strength, and fatigue performance, but increased accumulated strain along the compression direction after fatigue failure. The mi-crostructure of Ti6Al4V material revealed the presence of α-Ti clusters and a strong texture, which influenced mechanical properties. Cryogenic treatment caused lattice distortion, grain refinement, and increased grain boundaries, improving plasticity and fatigue performance while reducing creep resistance.The analysis of mapped cellular rhombic dodecahedron structures introduced the mapping ratio α and developed analytical and finite element models to estimate elastic modulus and Poisson's ratios. The models considered changes in strut section and position. The analytical model showed promising predictions of elastic modulus and accurately reflected the effective elastic modulus of a homogeneous body. Fatigue life prediction involved determining maxi-mum local stress, applying mean stress correction, and establishing the relationship between fatigue life of the homogeneous block and the life of the first fatigue-fractured strut. A nonline-ar relationship was observed between fatigue life and mapping ratio α, with the smallest map-ping ratio showing the best performance. The model provided accurate predictions and offered an alternative approach to predicting fatigue life based on testing results, saving costs.Overall, this research successfully analyzed the mechanical properties, microstructure, and performance of Ti6Al4V base material and mapped cellular rhombic dodecahedron structures, providing valuable insights for understanding and predicting their behavior
Wilfinger, Claudia-Antonella. "Fabrication of full soft diamond implants for functional rehabilitation." Electronic Thesis or Diss., Université Gustave Eiffel, 2023. http://www.theses.fr/2023UEFL2025.
Full textThe development of new biomedical technologies permits to help people suffering from the loss of motor or cognitive functions to partially recover from their loss. Neural study highlighted the electrical nature of brain signals, leading to the fabrication of implants interfacing with them. The recording and stimulation of different parts of the central nervous system were made possible through implants. Nevertheless, introducing a foreign object into the human body is not without consequences, as materials used to fabricate implants should be stiff enough to endure the body’s attacks but should not harm the surrounding tissues. Given these requirements, a material has recently gained attention: diamond. It can be synthetized in labs and used in conventional microtechnology processes to fabricate diamond-based devices. Diamond can either be an electrical insulator in its “natural” state, meaning a simple carbon lattice, or acquire a metallic-like conduction if doped enough with boron. The excellent biocompatibility of the carbonated crystal places it as a serious candidate in terms of electrode material. The chemical, electrochemical and mechanical properties, guarantee an inert, solid and reliable material. The PhD work was focused around diamond material, to fabricate a full-diamond implant. This means that intrinsic polycrystalline diamond was used as a protection layer of the device, while the electrodes sites were made of boron-doped conductive diamond (BDD). The obtained device was designed to record signals from the brain. To do this, the control of the structuring of diamond is essential to be able to use it within microtechnological processes. It was chosen to make localized growths of diamond, both intrinsic and doped, using aluminum nitride (AlN) as a masking layer. The growth rate, the chemical composition and the analysis of the surface condition confirmed the good handling of the diamond process. Another key point to consider when fabricating the implants is the choice of materials that will carry the electrical signals. The development of the conductive layer was done by combining titanium nitride (TiN) and platinum (Pt) to take advantage of both materials. The encapsulation of platinum by TiN resulted in conductive tracks capable of withstanding the growth conditions of diamond without any damage. Following the fabrication of the diamond implants, characterization must be performed. Two electrochemical analysis procedures were therefore used to examine the BDD electrodes and probe the material: cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The tests confirmed the presence of BDD at the electrode locations, good intrinsic diamond passivation, and low impedance at 1 kHz compared to implants with BDD-only electrodes. After ensuring proper functioning and reliability of the device, the implants were tested in vivo on rodents to probe their visual pathways. A craniotomy was performed on rats (at the Vision Institute) and mice (at EPFL) in order to place the electrodes on their visual cortex. The purpose of this surgical procedure is to make an acute recording of visual evoked potentials (VEPs), which are triggered by visual stimuli. The experiment was successful as the diamond implants were able to record VEPs in different experimental settings in both laboratories. These preliminary results pave the way for the future generation of diamond neural implants to ensure a reliable and stable chronic device
Demanget, Nicolas. "Analyse des performances mécaniques des endoprothèses aortiques par simulation numérique : Application au traitement des anévrismes tortueux." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2012. http://tel.archives-ouvertes.fr/tel-00784008.
Full textPerrin, David. "Vers un outil d'aide à la décision pour le traitement des anévrismes par endochirurgie." Thesis, Saint-Etienne, EMSE, 2015. http://www.theses.fr/2015EMSE0807/document.
Full textAbdominal aortic aneurysm is a pathology which needs to be treated by surgery when its diameter reaches 5.5cm, due to high risk of rupture that is often lethal. Endovascular repair consists in deploying a stent-graft inside the aneurysmal sac to exclude it from the blood flow. However, the drawback of this surgery is the relatively important post-operative complication rate at long-term, requiring costly secondary interventions. The origin of these complications is mainly related to mechanics and therefore, they could be prevented thanks to numerical simulation.The objective of this thesis is to elaborate a simulation methodology to deploy in silico stent-grafts in patient-specific aneurysms. The ultimate goal is to provide practioners with a computer aided decision tool to improve their pre-operative planning.A methodology was developed to simulate the deployment of bifurcated stent-grafts, composed of several modules, in patient-specific aortic aneurysms, whatever their geometry. Finite-element analyses were performed on several clinical cases from real patients, some of them which were highly tortuous and complex for practioners to achieve an accurate preoperative planning. The methodology was validated by comparing numerical results with the position of the stents in the post-operative scans.The ability of finite-element analyses to simulate stent-graft deployment in patient-specific aortic aneurysm geometries was proved in this thesis. Simulations have great potential for adapting stent-grafts to each patient and for anticipating possible post-operative complications at the stage of pre-operative planning