Blood pump with sterile motor housing

A blood pump, comprising:

• a motor stator element having a substantially cylindrical central cavity and an electrical connection;
• a disposable pump housing including an impeller chamber having a fluid inlet and a fluid outlet, a stator chamber for receiving said motor stator, a cap member for selectively sealing said stator within said stator chamber, a rotor chamber for receiving a rotor element therein, and a seal disposed between said impeller chamber and said rotor chamber, said rotor chamber being received completely within said substantially cylindrical cavity of said motor stator and substantially sealed off from said stator chamber and said impeller chamber via said seal;
• and
• a sterile pump assembly having an impeller disposed within said impeller chamber, a substantially cylindrical magnetic rotor disposed within said rotor chamber and coupled to said impeller, and a shaft extending between said rotor and said impeller;
• wherein said motor stator may be received within said stator chamber of said pump housing said the cap member thereafter secured to completely enclose and isolate said motor stator element.

A blood pump, comprising:

• a reusable motor stator element having a substantially cylindrical central cavity and an electrical connection;
• a disposable pump element having an impeller coupled to a substantially cylindrical magnetic rotor which is configured to fit within the substantially cylindrical central cavity of the motor stator element;
• and
• a cap member having a fluid tight connection for connecting the cap member to the pump element to completely enclose and isolate the motor stator element within a pump housing formed by the pump element and the cap member, wherein the pump element includes a first locating element and the motor stator element includes a second locating element which engages the first locating element to fix a relative position of the pump element and the motor stator element.

A blood pump, comprising:

• a motor stator element having a substantially cylindrical central cavity and an electrical connection;
• a disposable pump housing including an impeller chamber having a fluid inlet and a fluid outlet, a stator chamber for receiving said motor stator, a cap member for selectively sealing said stator within said stator chamber, a rotor chamber for receiving a rotor element therein, and a flexible sterile sleeve extending from the disposable pump housing over the cap member, wherein said rotor chamber is dimensioned to be received within said substantially cylindrical cavity of said motor stator and is substantially sealed off from said stator chamber and said impeller chamber;
• and
• a pump assembly having an impeller disposed within said impeller chamber, and a substantially cylindrical magnetic rotor disposed within said rotor chamber and coupled to said impeller;
• wherein said motor stator may be received within said stator chamber of said pump housing and the cap member thereafter secured to completely enclose and isolate said motor stator element.

A sterile blood pump assembly, comprising:

• a blood pump having a blood inlet, a blood outlet, and an impeller for pumping blood from the inlet to the outlet, the impeller coupled to a magnetic rotor element;
• a motor stator element configured to be received in the blood pump with the magnetic rotor element of the blood pump received within a coil winding of the motor stator element, wherein the motor stator element rotates the magnetic rotor element and the impeller of the blood pump element;
• and
• a sterile housing surrounding the motor stator element and isolating the motor stator element from a surrounding environment, wherein the blood pump element includes a first locating element and the motor stator element includes a second locating element which engages the first locating element to fix a relative position of the blood pump element and the motor stator element.

A method of pumping blood during heart surgery, the method comprising:

• providing a sterile pump housing including an impeller chamber, a rotor chamber, a stator chamber, and a cap member;
• providing a sterile pump assembly within said sterile pump housing, said sterile pump assembly including an impeller disposed within said impeller chamber, and a magnetic rotor disposed within said rotor chamber and coupled to said impeller;
• isolating a motor stator within said sterile pump housing by disposing said motor stator within said stator chamber and securing said cap member, said motor stator being completely sealed from said rotor chamber and said impeller chamber;
• placing the sterile pump housing within a sterile surgical field;
• and
• activating said motor stator to magnetically drive said rotor and said impeller and thereby pump a patient's blood by rotation of said impeller.