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Pump

  • US 4,925,377 A
  • Filed: 05/27/1988
  • Issued: 05/15/1990
  • Est. Priority Date: 12/05/1985
  • Status: Expired due to Term
First Claim
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1. A blood pump for connection to the blood circulatory system of a living being, comprising a pump chamber having an inlet opening at one end and an outlet opening at the opposite end, a first non-return valve located in said pump chamber adjacent its inlet opening for permitting a blood flow solely in the direction into said pump chamber through said inlet opening, a second non-return valve located in said pump chamber adjacent said outlet opening for permitting a blood flow solely in the direction out from said pump chamber through said outlet opening, said first and second non-return valves being mutually spaced as seen in the direction of extension of said pump chamber between said inlet opening and said outlet opening and each of said first and second non-return valves being individually reciprocatingly movable in said direction of extension and the volume of said pump chamber enclosed between said first and second non-return valves being variable and commensurate with the mutual spacing of said first and second non-return valves in said direction of extension, and individual controllable drive means for reciprocatingly moving said first and second non-return valve means, respectively, independently of one another in accordance with a controllable and variable pattern of mutual displacement, whereby blood can be pumped from said inlet opening to said outlet opening with a net flow variable in a controlled manner down to substantially zero without creation of a complete standstill of the blood in the pump and without creation of a sub-pressure at the inlet opening.

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