S022025 血管内ガイドワイヤーシミュレータの研究 : 血管と血管内治療デバイスの形状類似性がガイドワイヤー先端の接触力に及ぼす影響([S022-02]循環器系医療機器(2))

Abstract

In intravacular surgery,a guidewire tip often damage blood vessel.This study aims to investigate factors about the contact force of the guidewire tip.In this study,using the numerical analysis,the relationship between the contact force of the guidewire tip and deformed during insertion,was investigated.Laglange method for contact analysis to estimate an accurate contact force was adopted.Guidewires and blood vessels were modeled by short segments connected with spring.To quantify the shape of guidewire and blood vessel model,Fourier descriptor that a curve is expressed in frequency domain was used.The error between contact force curve and a factor curve was calculated.In this study,six factors were considered.We defined that,when the error factor is small,the factor was deep relationship to the contact force.Error function about the angle between guidewire angle and vessel wall was 4.35 X10^<-3>.Error function about shape difference of the guidewire between original and inserted guidewire was 9.94 X10^<-4>,this factor was the smallest.As a result,shape difference of the guidewire between the original and inserted guidewire was found to have the deepest relationships contact force.This factor was found to has very strong correlation(r=0.972 ±0.030) to the strain energy of the guidewire.This result,suggest that it is possible to estimate the contact force even if blood vessel shape is unknown.