The Study on the Creep of Fetus Umbilical Cord Vein Properties
Donghui Xu · Journal of Biomedical Engineering Research · 2012
To provide the creep properties index for the clinical application of making the umbilical cord as small diameter graft material.Taking the natural childbirth normal fetuses' umbilical vein sample that the age was in 22~28,the gestational age was in 38~40 weeks,and then put ten samples of the proximal placenta segment and the distal placenta segment respectively on the electronic universal testing machine to do the creep test.The human body′s temperature was simulated at 36.5±0.5℃,and the stress was applied to the sample with 0.01MPa/s stress increases speed,the setting time was 7 200 s.100 data were collected,then the normalized analysis method was used to calculate the two samples' normalized creep equation.The creep curves of two groups′ samples were changed with logarithmic relationship,the creeps of proximal placenta segment and the distal placenta segment of fetus umbilical cord vein at 7200s had significant difference(P0.05).The proximal placenta segment and the distal placenta segment of fetus umbilical cord vein have different creep properties.