Compliance variation following the change of longitudinal stretch ratio. A study on femoral artery and vein in a rabbit model / 生物医学工程学杂志

ABSTRACT

This study was aimed to establish a rabbit model of bridging artery defect with autogenous vein under equal arterial and venous compliances by selecting an appropriate anastomosing tension based on assessing the influence of vessel's longitudinal strain on compliance. The exponential form P = M1 x [eM2(v-v0)-1] was employed to fit the blood pressure-unit volume curves under different stretch ratios(lambda) obtained from real curves on 13 femoral arteries and 12 veins whose uniaxial loading tests at longitudinal directions had been performed, then the quantic M = a1 lambda 5 + a2 lambda 4 + a3 lambda 3 + a lambda 2 + a5 lambda + a6 was done to fit M-lambda data. Results showed the differential form dv/dp = 1/(M1 x M2 + 11.78 M2) derived from P = M1 x [eM2(v-v0)-1], and lambda reflected the relationship between compliance and stretch ratio (or longitudinal tension) under average artery pressure 11.78 KPa well. It was found that under longitudinal tension 1.19 g, the arterial and venous compliances were equal(0.031 microliter/KPa) while the respective stretch ratios were 1.32 and 1.67.