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Hydraulically actuated cardiac prosthesis and method of actuation

  • US 4,369,530 A
  • Filed: 05/19/1981
  • Issued: 01/25/1983
  • Est. Priority Date: 05/19/1981
  • Status: Expired due to Fees
First Claim
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1. An implantable hydraulic actuation system for supplying motive power to a blood pumping chamber having a flexible portion comprising:

  • an actuation fluid reservoir;

    actuation fluid pumping means in fluid communication with said reservoir for providing intermittent pulses of actuation fluid;

    an actuation chamber having an actuation fluid inlet path in fluid communication with said pumping means, and a separate actuation fluid outlet path in fluid communication with said reservoir;

    said actuation chamber being adapted to cause displacement of the flexible portion of said blood pumping chamber in response to changes in volume of actuation fluid in said actuation chamber; and

    valve means associated with said actuation chamber adapted to close or open said actuation fluid outlet path primarily in response to forces which vary as a function of actuation fluid flow through said actuation fluid inlet path.

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