Selection of materials for ventricular assist pump development and fabrication.

摘要: A study was undertaken to select 2 of the most promising bladder materials from a list 8 carefully chosen polymers. The polymers for testing included wide spectrum urethanes, as well polyester resin and millable polyolefin rubber. following were studied: Adiprene LW-500, Avcothane 51, Biomer, Hexsyn, Hytrel 4055, Mobay 240313, Pellethane 2103-80 AE, Tecoflex HR. selection process based on test matrix which divided into segmented steps, each logical sequel its predecessor, increasing technical complexity. Hydrolytic stability, flexure endurance, fabricability, tissue compatibility, hemocompatibility chronic compatibility evaluated, forming basis acceptance/rejection criteria. As result this search, biomaterials identified suitable use in conventionally flocked bladders; Biomer Both HR bladders have demonstrated impressive results circulatory analog loop endurance tests, with surpassing 50 million flexes date, (the longest running bladders) exceeding 150 flexes. Tests are continuing.