Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1996-05-22
1997-12-02
Thorpe, Timothy
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
417244, 417366, 417356, 41742312, 4174235, 415900, 310 905, 310216, F04B 4906
Patent
active
056928823
ABSTRACT:
A rotary blood pump includes a pump housing for receiving a flow straightener, a rotor mounted on rotor bearings and having an inducer portion and an impeller portion, and a diffuser. The entrance angle, outlet angle, axial and radial clearances of blades associated with the flow straightener, inducer portion, impeller portion and diffuser are optimized to minimize hemolysis while maintaining pump efficiency. The rotor bearing includes a bearing chamber that is filled with cross-linked blood or other bio-compatible material. A back emf integrated circuit regulates rotor operation and a microcomputer may be used to control one or more back emf integrated circuits. A plurality of magnets are disposed in each of a plurality of impeller blades with a small air gap. A stator may be axially adjusted on the pump housing to absorb bearing load and maximize pump efficiency.
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Aber Gregory S.
Akkerman James W.
Bacak James W.
Benkowski Robert J.
Bozeman, Jr. Richard J.
Barr Hardie R.
Thai Xuan M.
The United States of America as represented by the Administrator
Thorpe Timothy
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