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PRESSURE REGULATING CONTROLLER

  • US 3,731,680 A
  • Filed: 10/21/1971
  • Issued: 05/08/1973
  • Est. Priority Date: 10/21/1971
  • Status: Expired due to Term
First Claim
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1. In a method for extra-corporeal hemodialysis wherein blood is pumped through venous tubing from a patient into a dialysis assembly having means for effecting dialysis of waste materials from the blood and into a dialysis fluid flowing through the dialysis assembly, with further means for passing dialyzed blood through a debubbler prior to return through a venous tubing to the patient, the improvement which comprises:

  • A. providing a pressure indicating means for the debubbler;

    B. generating a signal responsive to the pressure in thE debubbler;

    C. monitoring the indicated pressure signal of the debubbler;

    D. amplifying said signal;

    E. applying clamping pressure on the venous tubing in response to a falling pressure signal from the debubbler to provide an increase of pressure in the venous tubing;

    F. removing clamping pressure on the venous tubing in response to an increasing pressure signal from the debubbler;

    G. actuating a pump disabling and terminating means upon a zero signal from said pressure indicating means; and

    H. providing an alarm sensor and transmitter for terminating operation of the pump.

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