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Dual lumen coaxial catheter

  • US 5,976,103 A
  • Filed: 06/23/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 09/26/1991
  • Status: Expired due to Term
First Claim
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1. A dual lumen catheter comprising:

  • a. an outer tube having a proximal end and a distal end;

    b. an inner tube having a proximal end and a distal end and defining therewithin a return lumen, said inner tube being smaller in outer cross-sectional area than the inner cross-sectional area of said outer tube, said inner tube being disposed within said outer tube to define between the outside of said inner tube and the inside of said outer tube an intake lumen having an annular cross section;

    c. a transition portion at said distal end of said inner tube and said distal end of said outer tube, said transition portion fixing said inner tube centrally within said outer tube to maintain said annular cross section of said intake lumen between said inner tube and said outer tube;

    d. a junction containing said proximal ends of said outer tube and said inner tube, part of said inner tube adjacent said proximal end of said outer tube being positioned in contact with the inside wall of said outer tube, so that said intake lumen at said proximal end of said outer tube has a generally U-shaped cross section; and

    e. a first connecting tube and a second connecting tube engaged in said junction, said junction providing fluid continuity between said first connecting tube and said intake lumen and between said second connecting tube and said return lumen, thereafter permitting said catheter to be used for simultaneous dual flow.

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