US-12623063-B2 - Balloon for balloon catheter

Abstract

Disclosed is a balloon for a balloon catheter that can prevent kinking or buckling of the balloon and elongation of the balloon in the longitudinal direction. A balloon ( 2 ) for a balloon catheter has a balloon body ( 20 ); the balloon body ( 20 ) has an inflating part ( 20 e ), a distal sleeve part ( 25 ), and a proximal sleeve part ( 21 ); the distal sleeve part ( 25 ) has a fixed part ( 25 f ) fixed to the shaft ( 3 ); the balloon ( 2 ) has a reinforcing part ( 60 ) disposed on an inner surface of the distal sleeve part ( 25 ) at a part of a circumferential direction of the distal sleeve part ( 25 ); the reinforcing part ( 60 ) is located proximal to a distal end of the fixed part ( 25 f ); and the balloon ( 2 ) does not have the reinforcing part ( 60 ) on an inner surface of the proximal sleeve part ( 21 ).

Inventors

• Masahiro Kojima
• Masato TSUEDA
• Yoshinori Nakano
• Takahisa HAMABUCHI

Assignees

• KANEKA CORPORATION

Dates

Publication Date

20260512

Application Date

20210816

Priority Date

20201116

Claims (9)

1. 1 . A balloon for a balloon catheter, comprising: a balloon body having an inflating part, a distal sleeve part located distal to the inflating part, and a proximal sleeve part located proximal to the inflating part, the distal sleeve part having a fixed part configured to be fixed to a shaft; and a reinforcing part disposed on an inner surface of the distal sleeve part so that the reinforcing part extends in a longitudinal axis direction of the distal sleeve part and partially covers the inner surface of the distal sleeve part in a circumferential direction of the distal sleeve part, wherein the reinforcing part is disposed proximal to a distal end of the fixed part.
2. 2 . The balloon for a balloon catheter according to claim 1 , wherein the inflating part has a straight tubular part and a distal tapered part located distal to the straight tubular part, so that the distal tapered part is located between the straight tubular part and the distal sleeve part in a longitudinal axis direction of the inflating part, and the reinforcing part is further disposed on an inner surface of the distal tapered part so that the reinforcing part partially covers the inner surface of the distal tapered part in a circumferential direction of the distal tapered part and extends along the inner surface of the distal tapered part in a section from a position of 0% to a position of 10% of the distal tapered part in a longitudinal axis direction of the distal tapered part, where a distal end of the distal tapered part is defined as the position of 0%, and a proximal end of the distal tapered part is defined as a position of 100% in the longitudinal axis direction of the distal tapered part.
3. 3 . The balloon for a balloon catheter according to claim 2 , wherein the reinforcing part continuously extends from the distal sleeve part to the distal tapered part in a longitudinal axis direction of the balloon body.
4. 4 . The balloon for a balloon catheter according to claim 2 , wherein the reinforcing part is made of resin.
5. 5 . The balloon for a balloon catheter according to claim 2 , wherein the reinforcing part is made of metal.
6. 6 . The balloon for a balloon catheter according to claim 1 , wherein the reinforcing part is made of resin.
7. 7 . The balloon for a balloon catheter according to claim 1 , wherein the reinforcing part is made of metal.
8. 8 . The balloon for a balloon catheter according to claim 1 , wherein the inflating part has a straight tubular part and a distal tapered part located distal to the straight tubular part, so that the distal tapered part is located between the straight tubular part and the distal sleeve part in a longitudinal axis direction of the inflating part; the reinforcing part is not disposed on an inner surface of the distal tapered part in a section from a position of 70% to a position of 100% of the distal tapered part in a longitudinal axis direction of the distal tapered part, where a distal end of the distal tapered part is defined as a position of 0%, and a proximal end of the distal tapered part is defined as the position of 100% in the longitudinal axis direction of the distal tapered part.
9. 9 . The balloon for a balloon catheter according to claim 1 , wherein the balloon does not have a reinforcing part on an inner surface of the proximal sleeve part.

Description

TECHNICAL FIELD The present invention relates to a balloon catheter for a balloon catheter. BACKGROUND ART One treatment for diseases such as angina pectoris and myocardial infarction caused by narrowing of blood vessels is angioplasty, in which a balloon catheter is used to dilate the narrowed area. In addition, various types of balloon catheters have been proposed for the purpose of dilating the narrowed part of body cavities other than blood vessels such as trachea and gastrointestinal tract. Treatment using balloon catheters is widely used because it is a minimally invasive therapy that does not require open chest surgery like bypass surgery. Balloon catheters are often inserted away from the lesion to be treated. For example, when delivering a balloon catheter to the heart, the balloon catheter is mainly inserted through the femoral artery or arteries of the wrist or upper arm. Therefore, for safe treatment, the balloon catheter is required to easily travel in the desired direction while following the curved narrow body cavity from the insertion point to the lesion. For example, Patent document 1 discloses a balloon catheter having improved trackability (the ability of the balloon to follow the meandering blood vessel) by employing a multilayer structure of a base material and a coating layer more flexible than the base layer to provides strength and flexibility. Patent document 2 discloses a balloon catheter with a tip having a tapered shape and a distal tapered part having a continuously thinned wall thickness for the purpose of making the tip more flexible and smaller in diameter. Patent document 3 discloses a balloon catheter with a tip made of flexible resin. RELATED ART DOCUMENT Patent Document Patent Document 1: JP 2005-246097 APatent Document 2: JP 2008-264569 APatent Document 3: WO 2017/158735 SUMMARY OF THE INVENTION Problems to be Solved by the Invention In order to safely perform a desired treatment using a balloon catheter, the balloon catheter is required to be easily delivered to the desired treatment site while following the body cavity according to the surgeon's manipulation. However, although the above balloons have certain strength and flexibility to improve trackability to some extent, there was room for improvement in terms of preventing a balloon from kinking, buckling, and elongating in the longitudinal axis direction of the balloon. Accordingly, the objective of the present invention is to provide a balloon for a balloon catheter that can prevent kinking and buckling of the balloon and elongation of the balloon in the longitudinal axis direction and can be easily operated. Means for Solving the Problems One embodiment of a balloon for a balloon catheter of the present invention that can solve the above problems has a balloon body having an inflating part, a distal sleeve part located distal to the inflating part, and a proximal sleeve part located proximal to the inflating part, the distal sleeve part having a fixed part that is to be fixed to a shaft; and has a reinforcing part disposed on an inner surface of the distal sleeve part at a part of a circumferential direction of the distal sleeve part, wherein the reinforcing part is disposed proximal to a distal end of the fixed part; and the balloon does not have the reinforcing part on an inner surface of the proximal sleeve part. Preferably, in the above-described balloon for a balloon catheter, the inflating part has a straight tubular part and a distal tapered part located distal to the straight tubular part; a distal end of the distal tapered part is termed as a position of 0%, and a proximal end of the distal tapered part is termed as a position of 100% in a longitudinal axis direction of the inflating part; and the balloon has the reinforcing part disposed on an inner surface of the distal tapered part at a part of a circumferential direction of the distal tapered part in a section from the position of 0% to a position of 10% of the distal tapered part. Preferably, in the above-described balloon for a balloon catheter, the reinforcing part in the distal sleeve part and the reinforcing part in the distal tapered part extend continuously in a longitudinal axis direction of the balloon body. Preferably, in the above-described balloon for a balloon catheter, the reinforcing part is made of resin. Preferably, in the above-described balloon for a balloon catheter, the reinforcing part is made of metal. Effects of the Invention The above-described balloon for a balloon catheter can prevent kinking of the balloon or buckling in the longitudinal axis direction during catheter operation such as delivery of the balloon catheter or treatment operation, and can also prevent elongation of the balloon in the longitudinal axis direction such as when introducing fluid such as pressurized fluid into the balloon to inflate the balloon. In addition, when inflating or deflating the balloon by introducing or discharging the fluid into or out of