Dual lumen coaxial catheter
First Claim
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.
0 Assignments
0 Petitions
Accused Products
Abstract
A dual lumen catheter is provided having an elongate body defining coaxial intake and return lumens and a junction containing a proximal end of the body with parts of the lumens in the junction constrained in side-by-side relationship. First and second connecting tubes are engaged in the junction and extend generally longitudinally away from the main body. The junction provides fluid continuity between the first connecting tube and the intake lumen and between the second connecting tube and the return lumen to permit the catheter to be used for simultaneous dual flow. The distal end of the catheter includes a conical transition portion at which the exterior diameter of the dual lumen main catheter section is smoothly reduced to that of an open-ended, single lumen cylindrical tip section of lesser diameter.
-
Citations
20 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A dual lumen catheter comprising:
-
a. an elongate body defining coaxial intake and return lumens; b. a junction containing a proximal end of said elongate body with parts of said intake lumen and said return lumen in said junction constrained in side-by-side relationship; and c. a first connecting tube and a second connecting tube engaged in said junction and extending generally longitudinally away from said elongate body;
said junction providing fluid continuity between said first connecting tube and said intake lumen, and between said second connecting tube and said return lumen, thereby permitting said catheter to be used for simultaneous dual flow. - View Dependent Claims (14, 15)
-
-
16. 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; and c. a transition portion at which said distal end of said inner tube is nonremovably secured to said distal end of said outer tube, said transition portion comprising materials from each of said inner tube and said outer tube blended into an integral structure, 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. - View Dependent Claims (17, 18, 19, 20)
-
Specification