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There is no excerpt because this is a protected post. You may download our presentation where we give results from recent in-vitro tests and advanced finite element analysis simulations as an example of a comprehensive and self-consistent engineering methodology for understanding therapeutic applications of RF tissue ablation. .
Radial force behavior is one of many engineering design criteria important to the design of implantable medical devices such as stents. Interpretation and extrapolation of bench-top data to predict in-vivo performance necessitates a thorough understanding of influence parameters such as boundary conditions and material uncertainty. An integrated modeling and test validation approach is needed to [...] You can download the brochure for this special symposium that brings together state-of-the-art developments in clinical imaging techniques, computer modeling, medical device testing and materials characterization with a focus on medical implants, their design and the Experimental Mechanics underlying device interaction with the human body. You can download a presentation of emerging transcatheter devices and technologies that I put together from the engineering design perspective that includes AAA solutions, fenestrated grafts, embolic protection devices, vena cava filters, stents, closure devices coronary sinus devices and percutaneous heart valves and repair technologies. The transformation behavior of Nitinol under uniaxial tension and four-point bending was investigated. A novel sample geometry produced from drawn tubing was used to observe the differences caused by localized phase transformation effects between the two types of loading and between samples with different process and load histories. Phase shifted moiré interferometry was used to [...] There is no excerpt because this is a protected post.
Nitinol is well suited to the design constraints imposed by medical device applications, however, only modest progress has so far been made regarding long term predictions of the structural integrity of such components. Challenges in predicting long term reliability of superelastic NiTi medical components include the consequences of manufacturing tolerances, uncertainty with regard to in vivo [...]
In this paper, we present a research methodology to characterize the effects of crystallographic orientation and grain size on the deformations and transformations in Nitinol. The approach involves a combination of full-field strain measurements using Moiré interferometry and finite element modeling. We explore the effects of localized stress raisers such as notches and grain boundaries, and [...] The mechanical properties of Nitinol stents are normally evaluated experimentally due to complexities resulting from large deformations and material nonlinearity. Despite difficulties associated with Finite Element Analysis (FEA), the success of computational analysis in combination with experimental study leads to better understanding of stent performance. This paper compares experimentally evaluated radial resistive forces of a [...] |
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