Durability Testing of Components for the Jarvik 2000 Completely Implantable Axial Flow Left Ventricular Assist Device

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Abstract
A cable-lead tester and real time bearing tester have been developed with provisions to test future implantable electronics, transcutaneous energy transfer system (TETS), and related interconnect cabling designs. The cable/lead tester, used in 1997 to test a previously considered implantable bellows-connector-cabling system, can test up to 10 samples at a time. X-Y-Z-theta motions are applied to the proximal end of the test specimen with its distal end fixed. The real time bearing tester is of a mock loop configuration with the bearings under test housed in a fully functional, Good Manufacturing Practices assembled axial pump. A simulated left ventricular pulsatile preload is applied to the inflow of the axial pump, while its outflow is subjected to an 80 mmHg aortic afterload by pumping into a fixed height tube with no outflow restriction. The heated blood bath saline used in this system is UV sterilized and mechanically filtered by use of a commercial salt water conditioning system attached external to the main preload fluid reservoir. The cable-lead tester and real time bearing tester design include provisions to house a complete Jarvik 2000 left ventricular assist device (Transicoil Medical, Norristown, PA) for in vitro system testing.

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