Balloon catheter
A balloon catheter having a distal-end tip which, even if caught in a stenosis, will not break apart from a distal end of an inner shaft of the balloon catheter when the balloon catheter is forcibly rotated or pulled by an operator. The distal-end tip of the balloon catheter is fixed to the distal end of the inner shaft, and a connecting tube covers an outer surface of the distal end of the inner shaft and a proximal end of the distal-end tip. An inwardly protruding portion of the connecting tube is embedded into the distal-end tip. This creates an anchoring effect and increases a welding area between an outer surface of the distal-end tip and an inner surface of the connecting tube, thereby reducing a risk that the distal-end tip will break apart from the distal end of the inner shaft.
1. A balloon catheter comprising:
a balloon;
an inner shaft fixed to a distal end of the balloon;
a distal-end tip fixed to and in direct contact with a distal end of the inner shaft; and
a connecting tube covering an outer surface on the distal end of the inner shaft and an outer surface of a proximal end of the distal-end tip,
wherein:
the connecting tube has an inwardly protruding portion that is embedded into the distal-end tip, and
a proximal end of the connecting tube is in direct contact with the balloon.
2. The balloon catheter according to claim 1 , wherein the connecting tube is made of a resin having a greater stiffness than the distal-end tip and a lower stiffness than the inner shaft.
3. The balloon catheter according to claim 2 , wherein the inwardly protruding portion is in contact with the distal end of the inner shaft.
4. The balloon catheter according to claim 2 , wherein the proximal end of the connecting tube covers the distal end of the balloon.
5. The balloon catheter according to claim 1 , wherein the inwardly protruding portion is in contact with the distal end of the inner shaft.
6. The balloon catheter according to claim 5 , wherein the proximal end of the connecting tube covers the distal end of the balloon.
7. The balloon catheter according to claim 1 , wherein the proximal end of the connecting tube covers the distal end of the balloon.
8. The balloon catheter according to claim 1 , wherein a sum of a thickness of the connecting tube and a thickness of the distal-end tip is constant in a longitudinal direction.
9. The balloon catheter according to claim 1 , wherein the inwardly protruding portion protrudes inwardly along an entire circumference of the connecting tube.
10. The balloon catheter according to claim 1 , wherein the connecting tube has a plurality of inwardly protruding portions.
11. The balloon catheter according to claim 10 , wherein the plurality of inwardly protruding portions is longitudinally provided on the connecting tube.