Cardioplegia monitoring system, flow cell cassette, variable ratio valve, and method
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United States of America Patent
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Nov 17, 1998
Grant Date -
N/A
app pub date -
Jul 24, 1996
filing date -
Jul 24, 1996
priority date (Note) -
Expired
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Abstract
A system and method for delivery of cardioplegic solution to the heart of a patient incorporates novel venturi flow cells individually adapted for insertion in the blood and crystalloid solution lines together with transducers for measuring a pressure drop across each venturi flow cell and transmitting it to a microprocessor to calculate flow rate for display on a monitor. The novel self-venting and self-priming transducers and venturi flow cells are incorporated in a disposable cassette. The transducers in the disposable cassette are removably snap connected to a hand set or plug housing which communicates with the computer or microprocessor and monitor. A novel variable ratio valve permits infinitely variable ratios of blood and crystalloid solution.
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