Catheter and balloon catheter

Abstract

To provide a catheter wherein, even if an outer layer is pulled in the axial direction (front end direction and rear end direction), the outer layer is unlikely to be separated from an inner layer; and a balloon catheter. Provided is a catheter 1 wherein an outer layer 40 has a protrusion 50 provided at the location of a recess 24 in the inner layer 10, the protrusion 50 extending through a gap 25to a deeper position than a reinforcement layer (coil body) 30 and also extending axially. As a result of this configuration, the joint strength between the inner layer 10 and the outer layer 40 is increased, and an anchor effect by which the protrusion 50 of the outer layer 40 engages with the reinforcement layer 30 (coil body) 30 reduces the possibility of separation of the outer layer 40 fromthe inner layer 10 occurring when the outer layer 40 is pulled axially (front end direction and rear end direction) at a narrowed section or a closed section during the insertion of the catheter 1 into a blood vessel, a bile duct, a pancreas duct, etc.

Description

technical field [0001] The present invention relates to a catheter and a balloon catheter used for diagnosing or treating a stenosis or blockage formed in a blood vessel or a digestive organ. Background technique [0002] When a stenosis or blockage is formed in a blood vessel, bile duct, pancreatic duct, etc., the flow of blood, bile (biliary fluid), pancreatic juice, etc. becomes poor. As a method of diagnosing or treating such a narrowed portion or blocked portion, a method of diagnosing or treating a catheter is widely practiced. [0003] Generally, a catheter includes a tubular inner layer, an outer layer covering the outer periphery of the inner layer, and a reinforcing layer disposed between the inner layer and the outer layer. Since the inner layer and the outer layer of the catheter are bonded via the reinforcing layer, it is difficult to increase the bonding strength between the inner layer and the outer layer. [0004] As a method to solve this problem, there is...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that when the outer layer is stretched toward the front end by the constricted portion or the clogged portion, the outer layer is easily peeled off from the inner layer.

Therefore, when the catheter is inserted into a curved blood vessel, bile duct, pancreatic duct, etc., stress is concentrated on the junction of the protruding part of the inner layer and the outer layer due to the bending of the catheter, and there is still the problem that the outer layer is easily peeled off from the inner layer.

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