Blood pump apparatus

摘要

A blood pump apparatus includes a housing having a blood inlet port and blood outlet port, a pump unit including an impeller that rotates within the housing, and an impeller rotational torque generation section. The housing includes a plurality of magnetic members embedded between the impeller and the impeller rotational torque generation section for transmitting a magnetically attractive force generated by the impeller rotational torque generation section to an impeller body. The pump device includes a non-contact bearing mechanism for rotating the impeller without contacting with the inner surface of the housing when the impeller is rotated by the impeller rotational torque generation section.

主权项

1. A blood pump apparatus comprising:
a housing including a blood inlet port through which blood enters the housing and a blood outlet port through which blood exits the housing; the housing comprising a first housing member and a second housing member configured so that a blood chamber is formed between the first and second housing members, the blood chamber fluidly communicating with the blood inlet and the blood outlet; an impeller rotatably positioned in the blood chamber to feed blood, and a plurality of first magnetic material members integrated with the impeller so that the impeller and the plurality of magnetic material members rotate together as a unit within the blood chamber in the housing, the impeller possessing oppositely facing surfaces each of which faces a respective inner surface of the housing; a motor stator positioned adjacent the housing to generate a magnetically attractive force to rotate the impeller; a plurality of spaced apart magnetic members each positioned in a respective recess in the second housing member so that the magnetic members are located between the impeller and the motor stator for directly transmitting the magnetically attractive force generated by the motor stator to the magnetic material members of the impeller; and a non-contact bearing mechanism for rotating the impeller without the impeller contacting the inner surface of the housing when the impeller is rotated by the motor stator, the non-contact bearing mechanism comprising at least one of; i) a plurality of spaced apart grooves provided on at least one of said oppositely facing surfaces of the impeller or at least one of said inner surfaces of the housing; and ii) a second magnetic material member in the impeller, an electromagnet in the first housing member to attract the second magnetic material member, and a position sensor mounted in the first housing member to detect a position of the impeller.