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Catheter having two coaxial lumens
| Details |
Inventors: Markel, David F.; Madison, Anthony J.; Roberts, David E.; Harkins, William R.;
Assignee: Medical Components, Inc. (Harleysville, PA)
Primary Examiner: Grieb; William H.
Assistant Examiner:
Attorney, Agent or Firm: Eilberg; William H.
A double-lumen catheter is made of two generally coaxial tubes. The tubes are joined, at their distal ends, by a sleeve inserted between the tubes, the sleeve being bonded to both tubes. The inner and outer tubes are connected, respectively, at their proximal ends, to first and second hubs. The hubs are bonded together. The distal ends of the tubes may be formed into a tapered tip, preferably having a rounded edge. The proximal ends of the tubes can be connected to external fluid devices. The invention also includes a method of making the catheter. According to this method, inner and outer tubes are separately formed, and the proximal end of each tube is connected to a hub. Then, the inner tube is threaded into the outer tube, until the distal ends of the tubes are near each other. A sleeve is inserted between the tubes, at the distal end, and the sleeve is then bonded to both tubes. The hubs are also bonded together. Thus, the tubes are firmly joined to each other, but only at their distal and proximal ends. The outer tube has a plurality of holes, located around its circumference, at the distal end, to provide access to the outer lumen. The distal tip provides an exit port for the inner lumen. The catheter can also be provided with a dilator/stylet which is initially inserted within the inner lumen, and which is withdrawn after the catheter has been inserted into a patient. |
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DETAILED DESCRIPTION The catheter of the present invention includes a generally cylindrical inner tube inserted within a generally cylindrical outer tube.
The tubes are preferably formed of a thermosensitive plastic material.
A generally cylindrical sleeve is inserted between the tubes, at their distal ends, and is bonded to both the inner tube and the outer tube.
The distal end is preferably formed into a tip, such as a tapered tip, although the edge of the tip is preferably rounded, and is not, by itself, capable of puncturing the skin.
The inner tube defines a generally cylindrical inner lumen which exits at the distal end, through the tip.
The outer tube and inner tube define a generally annular outer lumen which exits through holes formed in the outer tube, also near the distal end.
Because the cross-section of the outer lumen is annular, these holes can be disposed around more than half the circumference of the outer tube.
The catheter further includes hubs, affixed respectively to the exterior surfaces of the inner and outer tubes, near their proximal ends.
The outer lumen hub extends beyond the proximal end of the outer tube, so that the outer lumen hub can be bonded to the inner lumen hub.
Both hubs define means for connecting the lumens to external fluid devices.
The invention also includes a method of making the coaxial double-lumen catheter.
According to the method, the inner and outer tubes are separately formed, and are connected to hubs at their proximal ends.
A plurality of holes are punched in the outer tube, near its distal end.
Then, the inner tube is threaded into the outer tube, such that the distal ends of the two tubes become aligned, or nearly aligned.
A small cylindrical sleeve is inserted, at the distal end, between the two tubes, and is bonded to the tubes.
The hubs are bonded to each other.
The distal end may be formed into a tip, while maintaining an opening for the inner (distal) lumen.
It is therefore an object of the invention to provide a double-lumen coaxial catheter
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