Medical cryoablation catheter

Abstract

The present invention discloses a medical cryoablation catheter and belongs to the field of medical treatment. Main points of a technical scheme are as follows: the medical cryoablation catheter mainly comprises a conveying unit and a freezing unit, the conveying unit comprises a sheathing canal and a circulation loop arranged in the sheathing canal in an axial direction, the freezing unit is arranged at a far end of the sheathing canal, the freezing unit comprises a balloon and a directional bending piece, a far end of the circulation loop is arranged in the balloon, the far end of the circulation loop is fixedly connected with a far end of the balloon, the directional bending piece is connected to the far end of the circulation loop in a sleeving mode, shape changes of the balloon drivethe directional bending piece to bend, so that distance between the circulation loop and an inner wall of the balloon is controllable; and a refrigerant can be prevented from being directly sprayed into the balloon, a cooling rate and a freezing temperature of a freezing ablation area are effectively controlled, and a freezing performance of the freezing ablation catheter is improved.

Description

technical field [0001] The invention belongs to the medical field, in particular to a medical cryoablation catheter. Background technique [0002] Patent No.: CN201520045658 discloses a cryoablation balloon catheter with a guide wire lumen. The basic principle is to block the renal artery through the balloon to block the blood flow, and then release the cold energy from the helical structure in the middle area of ​​the balloon, thereby To achieve ablation of the renal artery, although the catheter can cryoablate the renal artery, it is necessary to block the renal artery and block the blood flow to improve the freezing performance of the catheter. If the blocking time is too long, it may cause renal ischemia Sexual necrosis. [0003] Most of the existing cryoablation products are structures in which the refrigerant is directly injected into the balloon or diffused from the center of the cold source in the balloon, but the structure of directly injecting refrigerant into the...

AI Technical Summary

Problems solved by technology

[0002] Patent No.: CN201520045658 discloses a cryoablation balloon catheter with a guide wire lumen. The basic principle is to block the renal artery through the balloon to block the blood flow, and then release the cold energy from the helical structure in the middle area of ​​the balloon, thereby To achieve ablation of the renal artery, although the catheter can cryoablate the renal artery, it is necessary to block the renal artery and block the blood flow to improve the freezing performance of the catheter. If the blocking time is too long, it may cause renal ischemia necrosis

[0003] Most of the existing cryoablation products are structures in which the refrigerant is directly injected into the balloon or diffused from the center of the cold source in the balloon, but the structure of directly injecting refrigerant into the balloon is likely to cause the balloon to burst, and the risk factor Too high; while the cooling rate of the structure in the balloon centered on the cold source diffuses outward is too slow, and the cooling energy consumption is too large

Images