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Design and Experimental Study of Polymer-Encased Active Surgical Needle
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Conference paper
Date
2019-10-19
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Mechanical Engineering
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DOI
http://dx.doi.org/10.34944/dspace/8154
Abstract
Nitinol or shape memory alloy wires have gained increased usage in medical devices like steerable catheters, needles, prosthetics, orthodontics and stents because of their bio-compatibility and high strain for a low specific actuation force. Their application in designing active biomedical devices come from its shape memory effect and pseudo-elasticity properties, which are both related to the change in the temperature of these wires. When the temperature of these wires increases and reaches above their phase transformation temperature from martensitic to austenitic phase, they deform and contract to their trained shape. There have been recent studies on the deformation of nitinol wires for bending surgical needles. The bending serves mainly for obstacle avoidance and precise targeting of treatment region in tissues during needle insertion. In addition, to prevent heat generated in Nitinol wires from escaping into tissue and damaging them, research focusing on the insulation and the packaging of the needle with biocompatible polymer is also needed. Investigating the relationship between the power supplied to the Nitinol wires, the temperature increase, and the corresponding bending of polymer encased needle is crucial to predict and to control the trajectory of these active needles during insertion into a tissue.
Description
Presented at the 2019 Biomedical Engineering Society (BMES) Annual Meeting, which took place October 16-19, 2019, in Philadelphia, PA.
Citation
Acharya, S., Zhao, Y., Gao, W., Ren, F., & Hutapea, P. (2019, October 16-19). Design and Experimental Study of Polymer-Encased Active Surgical Needle [Conference presentation abstract]. 2019 Biomedical Engineering Society (BMES) Annual Meeting, Philadephia, PA.
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