Patent ID: 7247147
Filing Date: 2007-07-24
Classification: A61M

Abstract:
1. A medical balloon catheter composed of a plurality of tubes and a balloon, this catheter having a structure in which a tube formed to have an outer diameter on a distal end side is consistently smaller along the entire length thereof than that on a proximal end side and serving as a tube for passing a guidewire inside thereof is arranged so as to pass inside the balloon and the balloon and the small-diameter portion on the distal end side in said tube are fused together in the vicinity of the distal end of the catheter, wherein a ratio of the outer diameter of the small-diameter portion on the distal end side in said tube to the outer diameter of the proximal end portion, (outer diameter of the small-diameter portion on the distal end side)/(outer diameter of the proximal end portion), is no less than 0.85, wherein the outer diameter of the small-diameter portion on the distal end side in said tube is no more than 0.52 mm, wherein a proximal end of an X ray impermeable ring is abutted against and permanently fixed to the boundary portion of the proximal end side and the small-diameter portion on the distal end side of the tube for passing a guidewire inside thereof, wherein a tube constituting the outer surface of the catheter is composed of a material that can be fused with the balloon and is fused and arranged on the proximal end side of the balloon.