The Effect of Platinum Content on the Multi-Physical Performance of Superelastic Nitinol Drawn Filled Tube (DFT~R) for Neurovascular and Other Medical Devices

摘要

On account of its relative biocompatibility and superelasticity, nitinol is an excellent choice for many self-expandable medical devices. One concern in clinical application is the low visibility in thin sections, often under 0.20 mm, of the material under X-ray fluoroscopy during surgical procedures. Efforts have been made to help increase this radiopacity while still maintaining the superelasticity and shape memory effect of nitinol [1,2]. To help resolve this issue. Fort Wayne Metals (FWM) developed a product called Nitinol Drawn Filled Tube (NiTi-DFT?), which comprises a radiopaque core with a superelastic sheath. Standard offerings include 10% to 40% platinum fill ratios, by cross-sectional area. Here we examine in brief the thermal and mechanical response of varied platinum fill ratios of NiTi-DFT?-Pt composite wire compared to that of solid nitinol round wire. This paper serves as an extension of the work done by Schaffer and Gordon at SMST 2003 [3].