Catheter having two coaxial lumens
First Claim
1. A double-lumen catheter, comprising:
- a) a generally cylindrical inner tube having interior and exterior surfaces,b) a generally cylindrical outer tube having interior and exterior surfaces, the outer tube being arranged around the inner tube such that the inner and outer tubes are substantially coaxial, the inner tube defining an inner lumen having a generally circular cross-section, the inner and outer tubes defining an outer lumen having a generally annular cross-section, the tubes having a proximal end and a distal end,c) a generally cylindrical sleeve inserted between the tubes at the distal end, the sleeve being bonded to the inner tube and to the outer tube,d) a first hub formed around the exterior surface of the proximal end of the inner tube,e) a second hub formed around the exterior surface of the proximal end of the outer tube, the second hub extending beyond the outer tube in the proximal direction, wherein the first and second hubs are bonded together, andf) means for connecting the lumens to fluid conveying devices.
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Accused Products
Abstract
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.
277 Citations
31 Claims
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1. A double-lumen catheter, comprising:
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a) a generally cylindrical inner tube having interior and exterior surfaces, b) a generally cylindrical outer tube having interior and exterior surfaces, the outer tube being arranged around the inner tube such that the inner and outer tubes are substantially coaxial, the inner tube defining an inner lumen having a generally circular cross-section, the inner and outer tubes defining an outer lumen having a generally annular cross-section, the tubes having a proximal end and a distal end, c) a generally cylindrical sleeve inserted between the tubes at the distal end, the sleeve being bonded to the inner tube and to the outer tube, d) a first hub formed around the exterior surface of the proximal end of the inner tube, e) a second hub formed around the exterior surface of the proximal end of the outer tube, the second hub extending beyond the outer tube in the proximal direction, wherein the first and second hubs are bonded together, and f) means for connecting the lumens to fluid conveying devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A double-lumen catheter comprising a pair of generally coaxial tubes, the tubes defining independent inner and outer lumens, the tubes having distal ends and proximal ends, the tubes being joined at their distal ends by a sleeve located between the tubes, the sleeve being bonded to both of the tubes, each of the tubes being bonded, respectively, at their proximal ends, to first and second hubs, the hubs being bonded to each other.
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22. A method of making a double-lumen coaxial catheter, the method comprising the steps of:
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a) forming an outer tube, the outer tube having a distal end and a proximal end, the outer tube having interior and exterior surfaces, b) punching at least one hole near the distal end of the outer tube, c) attaching a hub to the exterior surface of the outer tube, near the proximal end of the outer tube, such that the hub projects beyond the outer tube, d) forming an inner tube, the inner tube having a distal end and a proximal end, the inner tube having interior and exterior surfaces, e) attaching a hub to the exterior surface of the inner tube, near the proximal end of the inner tube, f) threading the inner tube into the outer tube, such that the inner tube moves from the proximal end towards the distal end of the outer tube, until the inner tube reaches the vicinity of the distal end of the outer tube, g) inserting a generally cylindrical sleeve between the inner and outer tubes, at their distal ends, h) bonding the sleeve to both the inner and outer tubes, and i) bonding the hubs of the tubes to each other. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A method of making a double-lumen coaxial catheter, comprising the steps of:
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a) providing an inner tube having distal and proximal ends, and having at least one hole near the distal end, b) connecting a first hub to the proximal end of the inner tube, c) providing an outer tube having distal and proximal ends, the outer tube having a diameter greater than that of the inner tube, d) connecting a second hub to the proximal end of the outer tube, e) threading the inner tube into the outer tube such that the distal end of the inner tube is positioned near the distal end of the outer tube, f) bonding the inner and outer tubes together at their distal ends, and g) bonding the first and second hubs together. - View Dependent Claims (29, 30)
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31. A method of making a double-lumen coaxial catheter, comprising the steps of:
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a) providing an inner tube having distal and proximal ends, and having at least one hole near the distal end, and an outer tube having distal and proximal ends, the outer tube having a diameter greater than that of the inner tube, b) threading the inner tube into the outer tube such that the distal end of the inner tube is positioned near the distal end of the outer tube, c) connecting a hub to the proximal ends of the tubes, in such a manner that the hub comprising means for holding the inner tube within the outer tube, and d) bonding the inner and outer tubes together at their distal ends.
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Specification