Development of an Electrical Energy Convertor for Circulatory Devices

摘要

Significant progress has been made improving ferro-fluid seals with 64 and 40 million cycles achieved on motor shaft seals and actuation arm seals. Assembly of lubricant filled convertors to begin using these seals. Seal tests conducted with new seal testing unit and actuation pad tests to begin with 400 cycle per minute pad testing unit. Life tests achieved 80,056,800 and 63,640,400 cycles. Convertor components except bearings have achieved 152,073,600 and 123,720,000 cycles. In-vitro tests include lubrication corrosion of convertor housing, Mod. X pump bladder and influence inflow pressure on pump output. Failure analysis indicate techniques for achieving two year life expectancy. Improved and larger cam follower bearings designed and in fabrication by New Hampshire. Improved energy convertor motors received which achieved 61.64% efficiency in mid-physiologic range. Gould P-50 pressure transducer with flange used routinely in left ventricular pressure measurements. Extended in-vivo tests of 1,000 hours are providing definitive information on best synchronization logic by the use of extended testing of each logic change. Titanium housings for energy convertor completed for future in-vivo tests.