Surgery – Blood drawn and replaced or treated and returned to body – Constituent removed from blood and remainder returned to body
Patent
1996-04-30
1998-10-13
Weiss, John G.
Surgery
Blood drawn and replaced or treated and returned to body
Constituent removed from blood and remainder returned to body
128DIG3, 422 44, A61M 3700
Patent
active
058205799
ABSTRACT:
Pulsatile cardiopulmonary flow closely approximating a natural heartbeat is generated in a heart-lung machine by using a proportioning valve to partly convey blood in the machine's cardiopulmonary circuit to the arterial supply line, and to partly recycle that blood into the cardiopulmonary circuit upstream of the arterial pump. The relative proportions of conveying and recycling are varied in accordance with a waveform approximating the waveform of a human heartbeat.
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Medtronic Inc.
O Ki Yong
Weiss John G.
Weissenberger Harry G.
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