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Cannulae having reduced flow resistance

  • US 7,445,592 B2
  • Filed: 06/10/2004
  • Issued: 11/04/2008
  • Est. Priority Date: 06/10/2004
  • Status: Active Grant
First Claim
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1. A percutaneous cannula for the exchange of blood within a patient'"'"'s vasculature, the cannula comprising:

  • a main cannula portion comprising a proximal portion, a distal portion, a first lumen, and a second lumen extending through the proximal portion, the first lumen having a first perimeter at a location within the proximal portion and a second perimeter at a location within the distal portion, the second perimeter being greater than the first perimeter; and

    a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising;

    a discharge opening configured to discharge blood externally to the cannula; and

    a redirecting member configured to direct blood flow being discharged through the discharge opening along the cannula toward the proximal portion of the main cannula portion.

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