Expandable catheter for delivery of fluids
First Claim
1. A fluid delivery catheter for insertion into a body lumen, said catheter expandable along most of its length inside the body from a smaller diameter used during insertion to a larger diameter by the pressure of said fluid, said expansion being smaller at the point said catheter is inserted into said lumen than at other points of expansion.
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Abstract
A multi lumen catheter is made from a number of thin walled flexible tubes bonded together to form an inner lumen. The inner lumen can withstand vacuum when the outside tubes are pressurized. During insertion the tubes are compressed and collapsed. The tubes expand by the pressure of the pumped fluid. At the point the catheter enters the body the expansion is restricted to a smaller diameter than the rest of the catheter.
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Citations
20 Claims
- 1. A fluid delivery catheter for insertion into a body lumen, said catheter expandable along most of its length inside the body from a smaller diameter used during insertion to a larger diameter by the pressure of said fluid, said expansion being smaller at the point said catheter is inserted into said lumen than at other points of expansion.
- 2. A cardiac assist device comprising a blood delivery catheter and a pump, said catheter having a highly flexible sleeve surrounding a less flexible inner tube, said inner tube used for suction and said sleeve expanding along most of its length when pressurized by the blood.
- 3. A multi-lumen catheter for the delivery of fluids into the body having at least one suction lumen and one pressure lumen and in which the ability of said suction lumen to withstand vacuum is created by pressurizing said pressure lumen.
Specification