Balloon catheter for coronary artery balloon dilatation and preparation method of balloon catheter

Abstract

The invention discloses a balloon catheter for coronary artery balloon dilatation and a preparation method of the balloon catheter. The balloon catheter and the preparation method aim to achieve that proximal push force is transferred to the distal end, so that balloon inflating and contracting time are shortened. An inflatable balloon is connected with a liquid flowing chamber, the distal end of a proximal catheter body of the liquid flowing chamber is connected with a distal catheter body, the strength of the proximal catheter body is larger than that of the distal catheter body, the distal end of the proximal catheter body is provided with a U-shaped notch, an inner tube is arranged in the inflatable balloon and the distal catheter body, the distal end of the inner tube is connected with the distal end of the inflatable balloon to form a guide wire inlet, and an opening of the proximal end connected on the side wall of the proximal end of the distal catheter body forms a guide wire outlet. The preparation method includes the steps of manufacturing of all parts and assembly welding. Compared with the prior art, the balloon catheter and the preparation method have the advantages that inflating and deflating time of the balloon are shorter as liquid or gas flow is large; and since the strength of a distal metal tube is smaller than that of a proximal metal tube, and elasticity of the distal metal tube is larger than that of the proximal metal tube, distal conveyance of the catheter is facilitated when the catheter extends into a bend position of a blood vessel.

Description

technical field [0001] The invention relates to a medical device and a preparation method thereof, in particular to a catheter for interventional treatment of coronary heart disease and a preparation method thereof. Background technique [0002] PTCA (Percutaneous transluminal coronary angioplasty, percutaneous transluminal coronary angioplasty, or coronary balloon dilatation) balloon catheter is a common clinical device for coronary artery stenosis caused by coronary atherosclerosis. It cooperates with guide catheters, guide wires and other instruments to complete the expansion of coronary stenosis. When used in combination with stents, it can complete the stent delivery and release operation after the expansion of coronary stenosis, so as to increase the inner diameter of coronary arteries, thereby Improve myocardial blood supply, relieve symptoms and reduce the occurrence of acute myocardial infarction. Today, almost all intracoronary vascular treatments are based on thi...

AI Technical Summary

Problems solved by technology

The proximal body and distal body of these balloon dilatation catheters adopt a single-strength metal tube structure and a polymer material tube structure respectively, resulting in bending blood vessels at the distal end. During the advancement of the balloon catheter, the proximal thrust is transmitted to the The transmission performance and controllability of the remote end are not good

In addition, the inner diameter of the proximal body of these catheters is relatively small, about 0.45mm, and a transition core wire is provided at the junction of the proximal body and the distal body of the catheter, and the transition core wire is fixed inside the distal outlet of the proximal body. Makes the distal outlet cross-sectional area of ​​the proximal body smaller, resulting in longer balloon inflation and deflation times

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