FLOATING ROTOR AXIAL FLOW BLOOD PUMP

提出了一种独特的微型轴流式血泵设计方案 其不需要中心轴承结构。 没有旋转密封或 清洗液的要求。 植入的泵/马达的体积为36 cc，重约120克。 几个非常初步的测试 血液中这一基本概念的不同模型表明， 没有机械接触。 流量足以满足慢性 LVAS也得到了证实。 溶血结果高于 尽管与其他器械Nimbus相比， 已经成功地发展，必须实现的减少不是， 太好了 考虑到这一点以及与之相关的广泛设计灵活性， 概念，达到可接受的溶血水平应该是可能的。 该应用程序的具体目标侧重于优化基本设计， 台架试验证明泵具有流量、溶血和耐久性 性能特征足以满足慢性LVAS血泵的要求。 一 微型泵，结合了这些优点与这样一个优雅的简单 设计将是一项重大的技术创新。 该泵可以 被纳入一个小的，相对便宜的完全植入式 LVAS将广泛应用于大约17000至35000名患者， 需要永久性心血管辅助的患者。

A unique design concept for miniature axial flow blood pumps is presented that requires no center bearing structure. There is no rotating seal or requirement for a purge fluid. The implanted pump/motor has a volume of 36 cc and weighs approximately 120 gm. Very preliminary tests of several different models of this basic concept in blood show that pump rotors run smoothly without mechanical contact. Flow capacity adequate for a chronic LVAS was also demonstrated. Hemolysis results were higher than what would be acceptable for a chronic pump, although compared to other devices Nimbus has successfully developed, the reduction that must be achieved is not that great. Considering this and the wide design flexibility associated with the concept, achieving acceptable hemolysis levels should be possible. The application's specific aims focus on optimizing the basic design and by bench tests demonstrating a pump that has flow, hemolysis, and endurance performance characteristics adequate for a chronic LVAS blood pump. A miniature pump that combines these virtues with such an elegantly simple design would represent a significant technical innovation. The pump could be incorporated into a small, comparatively inexpensive totally implantable LVAS that would have wide applications to some 17000 to 35000 patients per year who need permanent cardiovascular assistance.