Balloon dilatation catheter

Abstract

The invention relates to a balloon dilatation catheter for an interventional therapy technology. The balloon dilatation catheter comprises an ultra-soft head end 1, a dilation balloon part 2, a distal-end rod body 4, a proximal-end rod body 5 and a Luer joint 6, wherein an inner tube 3 for guiding a guide wire to pass is arranged in the catheter, and a development ring for marking the effective length of a dilation balloon is pressed on the inner tube. The balloon of the balloon dilatation catheter adopts a secondary stretching process for forming, and a balloon cone and the wall thickness of a connecting neck can further become thinner through second stretching; the connection between the balloon and the distal-end rod body is as follows: the balloon connecting neck is arranged at the inside and the distal-end rod body is arranged at the outside; and simultaneously, the distal-end rod body of the balloon dilatation catheter comprises two sections, namely a proximal-end rod body connecting section with a larger outer diameter and a balloon connecting section with a smaller outer diameter. The dilation balloon part of the balloon dilatation catheter and the balloon connecting section of the distal-end rod body in the balloon dilatation catheter disclosed by the invention have smaller diameters, thereby ensuring that a whole conveying system catheter has the ability of traversing blood vessels or lesion parts with smaller diameters.

Description

Technical field: [0001] The invention relates to a balloon dilation catheter for interventional therapy technology, which belongs to the field of balloon dilation catheters for interventional therapy in the medical field. Background technique: [0002] Coronary artery balloon dilatation is the basis of all current interventional treatment techniques for coronary heart pain. The process is to use X-ray angiography and video to monitor the balloon dilation catheter entering the aorta from the small artery in the human body with the assistance of a guiding catheter and a guiding wire. , eventually reaching the blocked coronary artery. The proximal end of the catheter is connected to a dilation pump, and by applying pressure to the dilation pump, the contrast agent is delivered through the lumen of the catheter to the balloon at the distal end of the catheter, and the blocked lesion is expanded by the expansion of the balloon, until it reaches a predetermined size Afterwards, t...

AI Technical Summary

Problems solved by technology

In the current production process of balloon dilatation catheters, the balloon is generally formed by blowing up. The balloon forming process is as follows: first process the mold with the shape of the balloon, and then pass the balloon forming tube through the balloon forming mold And keep it straight, seal one end of the balloon forming tubing, and pass high-purity nitrogen gas into the other end, the pressure of the high-purity nitrogen gas introduced gradually increases, and at the same time, gradually increase the temperature of the balloon forming mold until it reaches the predetermined temperature The balloon is molded with pressure, and kept for a certain period of time to finalize the balloon, and then the mold is opened to take out the balloon, and the balloon is further annealed to make its size stable. The single wall thickness is generally 4 to 8 times the wall thickness of the main part of the balloon, which makes the diameter of the connecting neck part of the balloon larger, with high hardness and poor flexibility, which ultimately affects the passing performance of the entire balloon dilation catheter; secondly , in the current technology, the distal rods used are generally tubes with equal diameters, that is, the diameters of the distal outer tubes on both sides of the guide wire entrance are the same, and there are also vertebral tubes with varying diameters, but the production process of such tubes is very complicated , resulting in an increase in cost; in addition, in terms of the connection between the balloon and the distal rod body, the current technology uses a connection method in which the distal rod body is inside and the proximal connection neck of the balloon is outside, which also results in the connection of the neck part Large diameter and high hardness are not conducive to passing through curved blood vessels and complex lesions

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