Catheter and balloon catheter

Abstract

[Problem to be Solved] An object of the present invention is to provide a catheter that does not reduce the thickness of an inner tube in a welded part and reduces the risk of penetration of a guide wire through the welded part. [Solution] In catheters 10, 10a, and 10b and a balloon catheter 10c, a protective film 40, 40a, or 40b made of a resin having higher heat resistance than a first inner tube 50 is interposed between an outer tube 30 and the first inner tube 50. Even if the first inner tube 50 is made of a soft thermoplastic resin, this configuration does not reduce the thickness of the first inner tube 50 in the welded part 100 and can reduce the risk of penetration of the guide wire, which is inserted into the first inner tube 50 by an operator, through the first welded part 110, 110a, 110b, or 110c to the walls of a blood vessel, a bile duct, a pancreatic duct, and so on from the first inner tube 50 near the outer tube 30.

Description

technical field [0001] The invention relates to a catheter and a balloon catheter, aiming at improving the blood vessel selectivity of a guide wire at a branch point. Background technique [0002] Once narrowed or blocked parts are formed in blood vessels, bile ducts, pancreatic ducts, etc., the flow of blood, bile (biliary fluid), pancreatic juice, etc. will become poor. Conventionally, a treatment method in which a guide wire is inserted into a stenosis or an occlusion, and then a balloon catheter following the guide wire is used to dilate the stenosis or occlusion has been widely practiced. [0003] Generally, the closer to the end of blood vessels, bile ducts, pancreatic ducts, etc., the more branch points there are for thick tubes (trunks) and thin tubes (branches). Therefore, for the guide wire, blood vessel selectivity that can change the advancing direction from the thick tube (trunk) to the thin tube (branch) at the branch point is sought. Nevertheless, the more t...

AI Technical Summary

Problems solved by technology

Therefore, when the operator inserts the first guide wire into the first inner tube, the tip of the first guide wire can easily pierce the welded portion where the film thickness of the tube has become thinner.

As a result, there is a problem that the first guide wire protrudes from the outer tube side of the first inner tube to the wall of the blood vessel, bile duct, pancreatic duct, etc. at the welded portion; The second inner tube side of an inner tube enters the interior of the second inner tube, and the second guidewire cannot be inserted into the second inner tube

In addition, in the catheter of Patent Document 2, since the first inner tube is formed of a metal helix, there is also the following problem: the frictional resistance between the first inner tube and the first guide wire becomes large, and the first guide wire is inserted into the first guide wire. inner tube becomes difficult

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