Surgery – Cardiac augmentation
Patent
1988-08-08
1990-03-13
Pellegrino, Stephen C.
Surgery
Cardiac augmentation
415900, 417356, 623 3, 604151, A61B 1900
Patent
active
049080121
ABSTRACT:
An implantable ventricular assist system uses a small high-speed axial flow blood pump which may be grafted into the patient's circulatory system. The pump includes a blood tube in which the pump rotor and stator are coaxially contained, and a motor stator surrounding the blood duct. A permanent magnet motor rotor is integral with the pump rotor. Purge fluid for the hydrodynamic bearings of the device and power for the motor are preferably percutaneously introduced from extracorporeal sources worn by the patient. The purge fluid is introduced into the pump stator blades. This construction avoids the creation of discontinuities in the blood path wall due to the routing of drive power and/or fluid supply elements through the blood path wall. The described construction greatly reduces the size of the implant needed for a given blood flow rate and enhances its physiological compatibility with the body. Specifically, the system of this invention minimizes the risk of infection by reducing vibration, minimizing the size of the percutaneous conduit, and directing most of the heat generated by the pump into the blood.
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Henig, The Washington Post, "Tiny Pump Gives Heart a Big Rest," 01/31/89.
Isaacson et al., Conference: Proceedings of the First Annual International Motorcon '81 Conference, Chicago, Il., Jun. 10-13, 1981.
Butler Kenneth C.
Moise John C.
Wampler Richard K.
Lewis Ralph
Nimbus Medical, Inc.
Pellegrino Stephen C.
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