Metallurgical analysis of aneurysm and microvascular clips

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Abstract
The design of an aneurysm clip and the choice of its component materials require complex considerations of corrosion resistance, biocompatibility, desired performance and manufacturing practicalities. This study analyzed 10 different types of aneurysm in patients and microvascular clips for chemical composition and metallurigical characteristics. The opening force of each clip was determined with a spring guage. All components of 4 multicomponent clips (3 aneurysm clips and 1 microvascular clip were manufactured from 17-7PH stainless stell, a strong precipitation-hardening grade of good general corrosion resistance. Two multicomponent clips (1 aneurysm clip and 1 microvascular clip) each contained 3 components manufactured from different alloys. In an implanted clip, an increased rate of corrosion may result from electrolytic reaction between components composed of different alloys. The 17-7PH stainless stell is a popular alloy for use in vascular clips, but it has several drawbacks. PH15-7Mo is another precipitation-hardening stainless stell, but contains molybdenum, which renders it potentially more resistant to corroison than 17-7PH.

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