Abstract
A magnet coupling type centrifugal pump for Percutaneous V-A Bypass was developed and evaluated in IN VITRO and EX VIVO. A newly designed centrifugal pump is a ”straight path centrifugal pump(SPC. Pump)”, which has a rotating disk with six blood paths and a coupling magnet. Each blood path of the disk is almost straight. Priming volume of the pump is only 46cc. Under pump rotational speed of 2500 rpm, output pressure of the pump was 560mmHg. Generation and growth of gaseous cavitation was not seen under negative pressure about 200mmHg. Hemolysis tests were performed with fresh bovine blood at flow rate of 3L/min against pressure load of 400 mmHg. Hemolysis of the SPC. Pump was approximately 30% lower than the cone type centrifugal pump. We performed the 29 hours V-A bypass experiment using a mongrel dog. At the end of the experiment, there was no apparant thrombus formation in the pump.
