Balloon catheter and method of production thereof
First Claim
1. A balloon catheter having:
- a catheter shaft with a double-tube structure comprising an outer tube and an inner tube through which a guide wire is passed, located at least in proximity of a distal end portion of the catheter, an inflation lumen through which a pressure fluid is passed being provided between said inner tube and said outer tube; and
a balloon disposed at the distal end portion of said catheter shaft and capable of being inflated, deflated, and wrapped by said pressure fluid, wherein an end of said balloon on a proximal side is joined in proximity to the distal end portion of said outer tube, while the other end of said balloon on the distal side is joined in proximity to the distal end portion of said inner tube, and a guide tube having an outside diameter smaller than the inside diameter of said outer tube and having an inside diameter larger than the outside diameter of said inner tube is disposed at least at the distal end portion of said outer tube being fixedly attached thereto so as to form a double-tube with said outer tube, and said inner tube is not fixed, but movably extends concentrically through the interior of said guide tube in the axial direction.
1 Assignment
0 Petitions
Accused Products
Abstract
It is an object of the present invention to provide a balloon catheter in which the inner tube is prevented from slackening after balloon inflation, improving the rewrapping of the balloon, discontinuity in the rigidity of the joined portions of the outer tube and the balloon is lessened, which prevents breakage, and the catheter advances through blood vessels better and passes more easily through narrow segments, preventing the catheter from “accordioning” and enhancing insertion force transmission. The balloon catheter pertaining to the present invention has a catheter shaft (1) with a double-tube structure comprising an outer tube (4) and an inner tube (5), and a balloon (3) disposed at the distal end portion of this catheter shaft (1). A guide tube (11) having an outside diameter smaller than the inside diameter of the outer tube (4) and having an inside diameter larger than the outside diameter of the inner tube (5) is disposed at least at the distal end portion of the outer tube (4) so as to form a double-tube with the outer tube (4), and the inner tube (5) is not fixed, but passes through the interior of the guide tube (11) in the axial direction.
198 Citations
32 Claims
-
1. A balloon catheter having:
-
a catheter shaft with a double-tube structure comprising an outer tube and an inner tube through which a guide wire is passed, located at least in proximity of a distal end portion of the catheter, an inflation lumen through which a pressure fluid is passed being provided between said inner tube and said outer tube; and
a balloon disposed at the distal end portion of said catheter shaft and capable of being inflated, deflated, and wrapped by said pressure fluid, wherein an end of said balloon on a proximal side is joined in proximity to the distal end portion of said outer tube, while the other end of said balloon on the distal side is joined in proximity to the distal end portion of said inner tube, and a guide tube having an outside diameter smaller than the inside diameter of said outer tube and having an inside diameter larger than the outside diameter of said inner tube is disposed at least at the distal end portion of said outer tube being fixedly attached thereto so as to form a double-tube with said outer tube, and said inner tube is not fixed, but movably extends concentrically through the interior of said guide tube in the axial direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
Specification