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Apparatus and method for withdrawing an optimum amount of blood per unit of time from a donor

  • US 5,045,057 A
  • Filed: 05/30/1989
  • Issued: 09/03/1991
  • Est. Priority Date: 06/01/1988
  • Status: Expired due to Fees
First Claim
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1. An apparatus for withdrawing an optimum amount of blood (Qo) per unit of time from a donor comprising:

  • a. a blood connection means for connecting the apparatus to the vascular system of the donor having an inlet open to said vascular system and an outlet;

    b. blood flow conduit means for conducting blood withdrawn from the donor by way of said blood connection means, having an inlet connected to said outlet of said blood connection means and an outlet;

    c. a blood pump connected to the outlet of said blood flow conduit means for withdrawing blood from the donor through said blood flow conduit means, said pump being connected to a power source so as to be energized by it;

    d. blood flow rate (Q) measuring means cooperating with said blood pump to obtain an electric signal representing the flow rate of blood through said blood pump which is supplied to a flow rate output connection;

    e. a pressure transducer for measuring the blood pressure (PA), connected to said blood flow conduit means between said blood connection means and said blood pump, said pressure transducer converting PA into an electric signal supplied to a transducer output connection;

    f. a control device connected to said transducer output connection, said blood flow rate measuring means output connection, and said power source of said blood pump for controlling Q through said blood pump in response to PA and Q, wherein said control device comprises means for adjusting Q through said blood pump to Qo at which the change in pressure (Δ

    PA) resulting from a particular change in the flow rate remains less than a maximum allowable value (Δ

    PA)m.

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