A cryoablation catheter

Abstract

The invention relates to a freezing ablation catheter. The freezing ablation catheter comprises a conveying unit and a freezing unit. The conveying unit comprises a sheathing canal and a circulation loop which is arranged in the sheathing canal in the axial direction, and the freezing unit is arranged on the far-end portion of the sheathing canal. The freezing unit comprises a balloon and directional bending pieces, the far-end portion of the circulation loop is arranged in the balloon, the far end of the circulation loop is fixedly connected with the far end of the balloon, the directional bending pieces are connected to the far-end portion of the circulation loop in a sleeved mode, and the change of the shape of the balloon drives the directional bending pieces to bend so that the distance between the circulation loop and the inner wall of the balloon can be controlled. It can be avoided that a refrigerant is directly ejected in the balloon, the cooling rate and the freezing temperature of a freezing ablation area are effectively controlled, and the freezing performance of the freezing ablation catheter is improved.

Description

technical field [0001] The invention belongs to the field of cryoablation, in particular to a cryoablation catheter. Background technique [0002] With the prolongation of life expectancy in our country, the prevalence of hypertension in the elderly has reached 40% to 60%. Although there are more and more safe and effective drugs, the treatment status of hypertension is still poor. According to the "China Cardiovascular Disease Report 2005" data released in 2006, the current awareness rate, treatment rate and control rate of hypertension in my country are only 30.6%, 24.7% and 6.1%, respectively, and the prevention and treatment of hypertension in my country is still at a low level. Therefore, the timely and effective treatment of hypertension is a problem that needs the common attention of the whole society. According to the seventh report (JNC7) of the United States Joint National Committee on the Prevention, Detection, Evaluation and Treatment of Hypertension in 2003, the...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN201520045658 has a cryoablation balloon catheter with a guide wire lumen. Its basic principle is to block the renal artery through the balloon, block the blood flow, and then release the cold energy from the helical structure in the middle area of ​​the balloon, so as to achieve the effect of the renal artery. Perform ablation. Although the catheter can perform cryoablation on 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 blockage time is too long, it may cause ischemic necrosis of the kidney

[0005] 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