CARDIAC ASSIST CENTRIFUGAL PUMP

摘要

A cardiac assist centrifugal pump (10) used for pumping human blood that may be surgically implanted in a patient or used extracorporeally. The pump (10) consists of two chambers (30 and 32) isolated from each other, one houses an electric motor (34) the other an impeller (42). The impeller (42) is rotatably fastened to the floor of the impeller chamber (30) by a stabilizing pin (48) used to eliminate float and other irregular motion of the impeller (42) which may cause damage to the blood cells. A face seal (62) is used to prevent blood collecting in low flow areas of the impeller (42) which may cause blood clots to form. A magnetic coupler (40 and 44) is used to transfer the motor's rotational power to the impeller (42) and to assist in maintaining the sealing integrity of the face seal (62) over prolonged and continuous operation of the pump (10).