Radio frequency ablation (RFA) catheter system for denervation of renal sympathetic nerves

Abstract

The invention provides a radio frequency ablation (RFA) catheter system for denervation of sympathetic nerves in renal arteries. The system comprises an ablation catheter, a control handle, a guiding catheter and an ablation generating device and can be provided or not provided with an independent guiding catheter control handle, wherein the ablation catheter is formed by a catheter body section and an ablation section from near end to far end in sequence. The system is characterized in that the front end of the catheter body section also comprises a controllable bending section; the controllable bending section is connected with the control handle by the catheter body section; at least two independent structures are installed on the ablation section; and an ablation head is installed on at least one independent structure. The system can carry out multipoint ablation simultaneously, monitors the ablation effect during operation in real time, and has better mechanical stability.

Description

technical field [0001] The invention relates to a medical device, in particular to a radiofrequency ablation catheter system for treating hypertension and entering into the renal artery to block the sympathetic nerve of the kidney. Background technique [0002] Hypertension is a common clinical disease and frequently-occurring disease. According to the latest data, the number of hypertensive patients in China has exceeded 200 million, and the number of patients is increasing year by year, and the age of onset is gradually advancing. Heart, brain, kidney and other important organ complications caused by high blood pressure have a high mortality rate and disability rate, which seriously endanger human health. There are about 30 to 40 million patients with resistant hypertension in my country. In the future, with the aging of the population and the increase in obesity and diabetes, the number of patients with resistant hypertension will further increase, which will bring great ...

AI Technical Summary

Problems solved by technology

Aiming at the problem that the ablation catheter of Ardian Company cannot perform multi-point ablation, US 2012 / 0116392 A1, US 2012 / 0029510 A1, CN 201110117776.8, CN201110327772.2 achieve multi-point simultaneous ablation by setting radio frequency ablation electrodes on multiple electrode rods respectively The purpose of CN 102198015A is to realize multi-point simultaneous ablation by installing multiple radio-frequency electrodes on a spiral electrode rod according to predetermined positions. The ablation electrode is not tightly attached to the blood vessel wall, which makes the radio frequency ablation electrode easy to move during ablation, resulting in too large ablation range and causing unnecessary damage to the patient; in order to make multiple radio frequency ablation electrodes closely adhere to the blood vessel wall at the same time, US 2012 / 0101413A1 adopts the scheme of setting an expansion balloon in the spiral electrode rod. By filling the balloon with liquid, the radiofrequency ablation electrode can be closely attached to the blood vessel wall, but the renal blood flow will be blocked when the balloon is expanded. If the ablation time is long, it will easily lead to renal ischemia and unnecessary complications; in order to avoid renal blood flow being blocked, US 2012 / 0029512 A1 replaces the balloon with a wire tennis ball, although it solves the problem of renal blood flow The problem of being blocked, but the operation is far less convenient than the balloon; in addition, the course of the human renal artery varies greatly, and the above-mentioned design schemes of multiple radiofrequency ablation electrodes are difficult to apply when the course of the renal artery varies, thus limiting the People on sympathetic therapy

Secondly, Ardian's single radio frequency lead catheter and the guidance control of the above-mentioned multiple radio frequency ablation lead catheters are not accurate enough, which makes the applicable population small, so it cannot well meet the clinical requirements.

Thirdly, it is difficult to monitor the ablation effect in real time for Ardian’s single radiofrequency electrode catheter and the above-mentioned multiple radiofrequency ablation electrode catheters, so it is difficult to detect the curative effect during the operation, which increases the risk of secondary surgery for patients

The previous ablation catheters were mainly controlled by a wire-controlled structure, but the wire-controlled structure was not easy to operate and the structure was relatively complicated. The present invention provides a catheter control system with a simpler structure

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