Experimental Investigation on the Effects of Different Electrolytic Polishing Solutions on Nitinol Cardiovascular Stents
Source abstract
Abstract
Nitinol has become a new type of biomedical material due to its shape memory effect, super elasticity, and good biocompatibility. At present, nitinol cardiovascular stents are mainly made by laser cutting, but the surface quality after laser cutting is poor, which causes thermal damage, residual stress, heat-affected zone, and recast layer. This situation seriously affects the function of cardiovascular stents and human metabolism and causes health hazards. This study compares three methods using acid–acid, acid–alcohol, and alcohol–salt electrolytic polishing solutions to improve the surface integrity of nitinol cardiovascular stents. The best polishing solution composition is determined through experiments, and the change of surface roughness is examined to find the best electrolytic polishing method. Experiments show that the outer diameter of the stent is reduced by about 220 μm after electrolytic polishing, which ensures the complete removal of the heat-affected zone and the recast layer. In the alcohol-salt electrolyte, a cardiovascular stent with the smallest surface roughness (1.84 nm) can be obtained using 16 V voltage and electrolytic polishing for 20 min.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Bone Tissue Engineering Materials · Shape Memory Alloy Transformations · Advanced Machining and Optimization Techniques
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References (40)
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