catheter

Abstract

The present invention aims to provide a catheter capable of efficiently transmitting an operator's pushing force to the distal end and reducing the risk of being caught in curved parts such as blood vessels, bile ducts, and pancreatic ducts. The structure is as follows: When the catheter (10) is inserted into the curved part of the blood vessel, bile duct, pancreatic duct, etc., the catheter (10) responds to the external force (1, 2, 3, 4) acting on the curved part of the blood vessel, bile duct, pancreatic duct, etc. , the second core wire (80) can be moved to the most suitable position. Therefore, the mutual interference between the first core wire (70) and the second core wire (80) can be reduced, the catheter (10) cannot be bent along blood vessels, bile ducts, and pancreatic ducts, and the first core wire (70) and the second core wire (80) ) either or both parties are discounted.

Description

technical field [0001] The present invention relates to a catheter capable of efficiently transmitting an operator's pushing force to a catheter tip, and capable of bending along curved portions of blood vessels, bile ducts, pancreatic ducts, and the like. Background technique [0002] When blood vessels, bile ducts, pancreatic ducts, etc. are narrowed or blocked, the flow of blood, bile (biliary fluid), pancreatic juice, etc. will become poor. Conventionally, in order to treat a stenosis or an occlusion, treatment using a catheter has been widely performed. In order for the catheter to reach the stenosis or occlusion, it is necessary for the operator to efficiently transmit the pushing force toward the distal end of the catheter to the distal end of the catheter, and to prevent the catheter from getting caught in the bends of blood vessels, bile ducts, and pancreatic ducts. [0003] Among them, as a method of increasing the pressing force toward the distal end of the cathe...

AI Technical Summary

Problems solved by technology

[0004] However, in the catheters of Patent Document 1 and Patent Document 2, since the core wire is fixed to another member (for example, an outer tube, an inner tube, or a hypotube, etc.), the core wire has almost no degree of freedom.

Therefore, when the catheter is inserted into blood vessels, bile ducts, pancreatic ducts, etc., the core wire cannot move to the most suitable position along the bends of the blood vessels, bile ducts, pancreatic ducts, etc., and the core wire may be folded or stuck in the middle of the blood vessel, bile duct, etc. , Pancreatic duct and other bending parts, and the catheter cannot reach the narrowed part or occluded part

In particular, in the case of arranging a plurality of core wires, although the axial rigidity can be improved, when the catheter is inserted into a curved portion of a blood vessel, bile duct, pancreatic duct, etc., the plurality of core wires interfere with each other, and the catheter cannot follow the blood vessel, bile duct, pancreatic duct, etc. The bile duct, pancreatic duct, etc. are bent and cannot reach the stricture or occlusion.

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