How T V, al-Shukri S
Institute of Medical and Dental Bioengineering, University of Liverpool.
Proc Inst Mech Eng H. 1991;205(4):243-9. doi: 10.1243/PIME_PROC_1991_205_300_02.
An in vitro study was conducted to measure the pressure distributions in knitted polyester axillobifemoral bypass grafts under steady and pulsatile flow of a Newtonian fluid. The relationship between pressure drop and flowrate was determined across the outflow branches of two types of axillobifemoral grafts. Pressure losses were greater across the 90 degrees side branch of the T-type graft than in the Y-type graft at all Reynolds numbers studied. Mean pulsatile pressure drops in the T graft were greater than those measured in steady flow at the same Reynolds number. Estimates of the likely in vivo pressure drops are made under resting and exercise flow conditions. It is suggested that the Y graft is less likely to have a significant effect on blood supply to the lower limbs, even at high blood flowrates.
进行了一项体外研究，以测量在牛顿流体的稳定流和脉动流下，针织聚酯腋双股旁路移植物中的压力分布。确定了两种类型腋双股移植物流出分支上的压降与流量之间的关系。在所研究的所有雷诺数下，T型移植物90度侧支的压力损失大于Y型移植物。T型移植物中的平均脉动压降大于在相同雷诺数下稳定流中测得的压降。在静息和运动血流条件下对体内可能的压降进行了估计。结果表明，即使在高血流量下，Y型移植物对下肢血液供应产生显著影响的可能性较小。
