Medical balloon catheter

• US 7,247,147 B2
• Filed: 11/08/2001
• Issued: 07/24/2007
• Est. Priority Date: 11/09/2000
• Status: Expired due to Term

• Current Assignee: Kaneka Corporation
• Original Assignee: Kaneka Corporation
• Inventors: Fukaya, Kohei, Hashiba, Masato, Nishide, Takuji
• Primary Examiner(s): Thanh; Loan H.
• Application Number:
  US10/415,997
• Publication Number:
  US 20040116957A1
• Time in Patent Office: 2,084 Days
• Field of Search: 604/96.01, 604/103, 604/103.04, 604/523, 604/915, 604/917, 606/192, 606/194
• US Class Current: 604/103.1
• CPC Class Codes: A61M 25/0045 multi-layered, e.g. coated coating materials A61L29/08
• CPC Class Codes: A61M 25/0054 with regions for increasing flexibility
• CPC Class Codes: A61M 25/104 used for angioplasty

Abstract

The medical balloon catheter of the present invention comprises a catheter shaft composed of a distal end shaft and a proximal end shaft and a balloon on the distal end of the distal end shaft, wherein the proximal end shaft is composed of a single member and the distal end portion of the proximal end shaft is lower in rigidity than the other parts thereof. The present invention also provides a medical balloon catheter having a structure in which a tube for passing a guidewire inside thereof is arranged so as to pass inside the balloon and the balloon and tube are fused together in the vicinity of the distal end of the catheter, wherein the ratio of the outer diameter of the small-diameter portion on the distal end side of the tube to the outer diameter of the proximal end portion is no less than 0.85.

Claims

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.

2. 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 Shore hardness of the material constituting at least that part of the small-diameter portion on the distal end side in said tube which is fused to the balloon is less than the Shore hardness of the material constituting the balloon, 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.

3. 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 flexural modulus of elasticity of the material constituting at least that part of the small-diameter portion on the distal end side in said tube which is fused to the balloon is less than the flexural modulus of elasticity of the material constituting the balloon, 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.

4. 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 melting point of the material constituting at least that part of the small-diameter portion on the distal end side in said tube which is fused to the balloon is lower than the melting point of elasticity of the material constituting the balloon, 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 a tube for passing a guidewire inside thereof, wherein the 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.

5. 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 part of the small-diameter portion on the distal end side in said tube which is fused to the balloon is composed of a polyester elastomer having hard segments and soft segments in a molecule and a ratio of the soft segments is higher than 13%, 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 a tube for passing a guidewire inside thereof, wherein the 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.

6. 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 part of the small-diameter portion on the distal end side in said tube which is fused to the balloon is composed of a polyamide elastomer having hard segments and soft segments in a molecule and a ratio of the soft segments is higher than 14%, 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 a tube for passing a guidewire inside thereof, wherein the 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.