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Percutaneous venous cannula for cardiopulmonary bypass

  • US 4,808,163 A
  • Filed: 07/29/1987
  • Issued: 02/28/1989
  • Est. Priority Date: 07/29/1987
  • Status: Expired due to Fees
First Claim
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1. A venous cannula for performing full or substantially full cardiopulmonary bypass comprisinga. a cannula having an opening at its distal end and a plurality of openings positioned around and through the cannula at its distal portion;

  • b. expansion means integrally formed adjacent the distal end of said cannula, said expansion means being adapted to dilate the walls of a vascular space and space said walls away from said openings, said expansion means having memory hysteresis, whereby said expansion means has a natural repose comprising an expanded orientation; and

    c. a stylet slidably positioned within said cannula and having a diameter slightly larger than said opening in the distal end of said cannula;

    said stylet having a tapered distal end adapted to extend through said opening in the distal end of said cannula whereby the degree of engagement of the stylet with the periphery of the opening at the distal end of said cannula controls the expansion and contraction of said expansion means.

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