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Method and apparatus for cardiac blood flow assistance

  • US 5,964,694 A
  • Filed: 06/24/1997
  • Issued: 10/12/1999
  • Est. Priority Date: 04/02/1997
  • Status: Expired due to Term
First Claim
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1. An intravascular microaxial flow pump, comprising:

  • a cylindrical drive unit of preselected outer diameter having an electric motor disposed therein driving a shaft distally extending therefrom wherein such shaft is supported by bearing located at the extreme proximal end of said drive unit and the extreme distal end of said drive unit;

    a cylindrical pump housing rigidly attached to said drive unit having essentially the same preselected outer diameter and oriented to be coaxially and distally disposed with respect to said drive unit;

    an impeller rotatably disposed within said pump housing, driven by said drive shaft, and operative to draw fluid into and through said housing and over drive unit;

    a first pressure sensor positioned on said drive unit so as to sense discharge pressure and generate a first signal indicative thereof;

    a second pressure sensor positioned on said pump housing so as to sense inlet pressure and generate a second signal indicative thereof; and

    a controller, configured for receiving said first signal generated by said first sensor and said second signal generated by said second sensor, processing said signals, and controlling the supply of power to said motor in accordance with such processed signals.

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