[Bridging artery defect with autogenous vein under required anastomosing tension--a theoretical analysis based on...

This study was aimed to establish a rabbit model of bridging artery defect with autogenous vein under required tension by selecting and appropriate length of graft. The uniaxial loading test in longitudinal direction was performed using 14 femoral arteries and 14 femoral veins. The tension(F)-strain(lambda) curve was measured and the exponential form F = m1 * [em2(lambda-1)-1] was employed to fit the curve. The results showed that with the range of 35.0 mm actual isolated length (AIL), the exponential form Fa = 0.22[e5.75(lambda a-1)-1] and Fv = 6.15 * 10(-3) [e7.89(lambda v-1)-1] could well fit the experimental data of rabbit's femoral artery and vein respectively. Therefore to make sure the required anastomosing tension F, the length of vein graft(LVG) should qualify the equation: (LVG/1.64) x lambda v + [(AIL - ADL)/1.58] x lambda a = AIL while 1.65 and 1.58 are the physiological stretch ratio of artery and vein, lambda v and lambda a stand for that of vein and artery under tension F, respectively.