A new type of inferior vena cava filter and its animal experiment

1IntroductionPul monary embolism(PE),also called lung embolism,is the clinical pathological physiological syn-drome of the dyshemia in the lung caused by thrombus or other kinds of embolus clogging the pul monaryartery andits branches.In75%-90%of the cases,pul monary artery embolus hasits sourceinthe veinsinlower li mbs and the cavitas pelvis.The thrombus amotioes fromthe vein andis sent to the cor dextrumbybloodstream.At last it reaches the pul monary artery andthus pul monary embolismcomes …

A new type of inferior vena cava filter and its animal experiment

This article explains the definition of pulmonary embolism as well as its causes and elaborates on a new type of inferior vena cava filter(VCF)we have developed. Shaped like a waistdrum, the VCF is mainly made of TiNi shape memory alloy-wire. It has a subulate wire frame which can intercept the thrombus on each side. Its medial body is made up of straight shape memory alloy-wire . Every pillar is bound by several shape memory alloy springs. This type of inferior vena cava filter has a good resistance to fatigue and is hard to be broken. Through animal experiments its framework has been proved to be lasting. Neither deformation nor fragmentation happened when the VCF had been kept in the body for a long time. The thrombus interception efficiency of our VCF is higher than imported VCFs. The filter is unfavorable for thrombosis. After implantation, the IVC was completely unimpeded and no displacement occurred. Moreover the VCF did little damage to the Wall of vein. Neither IVC perforation nor haematoma occurred after the operation.