Catheter of composite structure

Abstract

The invention discloses a catheter of composite structure. The catheter comprises a high-molecular pipe on the outer layer, a tubular woven net or spring net on the middle layer and a smooth inner layer. The high-molecular pipe on the outer layer is made of nylon, nested polyetheramide elastomer, polyurethane or silicone rubber; the wall thickness of the far end of the woven net or spring net on the middle layer is smaller than or equal to the wall thickness of a woven net body or spring net body; the inner layer is made of polytetrafluoroethylene or high-density polyethylene or nested polyetheramide elastomer containing a friction coefficient reducing additive. Compared with a conventional plastic catheter, the composite catheter has the advantages that the same mechanical performance requirement is met, and the wall thickness can be greatly reduced; the passing performance, folding resistance and controllability of the composite catheter are greatly improved, the composite catheter can be pushed to deeper and smaller blood vessels under the same conditions, and the operative successful rate is increased.

Description

technical field [0001] The invention relates to a medical catheter and belongs to the technical field of medical appliances. Background technique [0002] Medical catheter is a general term for lumen products that connect the inside and outside of the human body, and can be made of different materials such as metal, plastic, and rubber. It is widely used as a pathway in interventional surgery, drainage, drug administration, blood transmission, and auxiliary introduction of other medical devices. Conventional interventional catheters are made of softer plastic. In the operation of interventional therapy, if some blood vessels are relatively curved and the lumen is narrow, it is very difficult to push the conventional catheter into the distal blood vessel. The proximal and middle sections of the catheter are often bent or even broken, or the distal end of the catheter is knotted. These are all plastic The axial and radial mechanical properties of the catheter itself are not ...

AI Technical Summary

Problems solved by technology

[0004] 1) When the bending radius of the blood vessel is small, this kind of catheter is prone to bending, and the metal wire of the severely bent catheter will be exposed and directly contact the blood vessel. The silk catheter will cause damage to the intima of the blood vessel, and in severe cases, it will puncture the blood vessel and endanger the life of the patient

[0005] Conventional practice to reduce the appearance of "ruth" is to use a very high wall thickness outer tube, but the disadvantage is that the wall thickness of the finished tube is increased, and the advantage of the tube with metal braid is lost

[0006] 2) The metal wire used to make the woven mesh often has surface attachments that are difficult to observe with the naked eye. The outer surface of the catheter that uses the woven mesh with the attachment will have bulges. When the catheter passes through a blood vessel with a small bending radius or with In the case of blood vessels with severe plaques, the catheter is prone to canton, which increases the difficulty of surgery, and in severe cases, surgery cannot be performed

[0008] 3) For vascular intervention, especially for cerebrovascular intervention, the inner diameter of the distal vessel becomes smaller and the vessel wall is thinner. However, the distal end of the interventional catheter used in clinical practice is too rigid, which often compresses and shifts the placed guide wire, which is not conducive to perform surgery

Paradoxically, the use of smaller braided wires also reduces the push performance of the finished catheter, which is not conducive to surgical implementation.

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