Bidirectionally controllable saline-perfusion renal artery radiofrequency ablation catheter

Abstract

The invention discloses a bidirectionally controllable saline-perfusion renal artery radiofrequency ablation catheter. The catheter comprises an ablation electrode tip, a cannula, and a control handle provided with a control valve connected successively. The ablation electrode tip or the cannula is provided with a saline infusion hole. Two sides of the rear end of the ablation electrode tip are connected with two traction filaments. A fixed pulley is arranged in the control handle. The two traction filaments are wound around the fixed pulley and then connected with the control valve. The control valve of the invention can control the bidirectional bending of the ablation electrode tip. The ablation electrode tip can enter a distorted or angled renal artery without catheter rotation. Besides, a bidirectional control mode can guarantee a good adherence to a blood vessel wall in a multipoint ablation process of the ablation electrode tip, and therefore has an advantage of strong control performance. In addition, continuous saline perfusion can prevent the ablation electrode tip temperature from being too high, and avoid impedance increase caused by ablation position incrustation, thereby effectively removing the renal artery sympathetic nerve and improving the ablation security.

Description

technical field [0001] The invention relates to a two-way controllable saline perfusion renal artery radiofrequency ablation catheter, which belongs to the technical field of medical devices. Background technique [0002] Hypertension is a common and frequently-occurring disease, and the prevalence of hypertension in adults over the age of 18 is close to 20%. Although there are many drugs for the treatment of hypertension, there are still some people who cannot reach the target blood pressure. The results of multiple clinical trials have shown that removing renal sympathetic nerves can achieve the purpose of treating hypertension, but so far, there are still no mature methods and devices for removing renal sympathetic nerve fibers. Early studies used surgical resection of renal sympathetic nerves. Although the purpose of lowering blood pressure could be achieved, the surgical injury was large and there were many complications. In recent years, the method of radiofrequency ...

AI Technical Summary

Problems solved by technology

[0003] The ablation electrode tip of the currently used radiofrequency ablation catheter is controlled by a single pull wire, which can only be bent in one direction. Injury to blood vessels; Second, in multi-point renal artery ablation, poor rotation of the electrode tip may result in poor apposition to the vessel wall, affecting the ablation effect

[0004] In addition, the renal artery radiofrequency ablation catheters on the market are all non-saline perfusion. During the renal artery ablation process, the temperature of the ablation electrode tip of the catheter will continue to rise, and the blood around the ablation electrode tip will coagulate, resulting in the formation of scabs at the ablation site and causing impedance. increase, affecting the depth of ablation, making it incomplete to remove the sympathetic nerves of the renal arteries

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