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Coaxial dual lumen catheter

  • US 5,480,380 A
  • Filed: 06/23/1994
  • Issued: 01/02/1996
  • Est. Priority Date: 03/16/1993
  • Status: Expired due to Term
First Claim
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1. A dual lumen catheter comprising:

  • outer tube material and inner tube material;

    a main portion extending axially between proximal and distal ends and having a selected first cross-sectional area, the main portion of the catheter including respective main portions of the outer tube material and the inner tube material and defining an annular intake lumen between the main portions of the inner and outer tube materials and a main part of a return lumen defined by the inner tube material, the main portion of the outer tube material terminating at the distal end of the main portion of the catheter in a converging tapered portion, and the main portion of the catheter having a plurality of side openings in the outer tube material adjacent the distal end of the main portion of the catheter, the openings being spaced around the main portion of the catheter to provide access into the intake lumen;

    a tubular transition portion made of both outer and inner tube materials blended together integrally, and having a second cross-section smaller than said first cross-sectional area, the transition portion extending distally from said tapered portion;

    a tip portion made up exclusively of outer tube material and extending distally from the transition portion and being a continuation of the transition portion whereby the tip portion and the transition portion define a tip section which includes a return lumen part which, together with said main part of the return lumen, forms a return lumen having substantially constant cross-section;

    a connector attached to the proximal ends of the inner and outer tube materials; and

    intake and return tubes attached to the connector for continuous fluid communication with the respective intake and return lumens whereby the catheter can be used for procedures requiring dual flow through a single catheter.

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