Balloon expanding renal artery sympathetic nerve ablation catheter

Abstract

A balloon expanding renal artery sympathetic nerve ablation catheter comprises spiral electrodes, a balloon, an outer catheter and a functional handle, wherein the spiral electrodes are a pair of electrodes in parallel and are fixed on the outer surface of the balloon, the electrodes can be tightly attached to the blood vessel wall after the balloon is full to carry out double-electrode ablation on the sympathetic nerves on the blood vessel, a plurality of temperature sensors are connected below the electrodes, and the temperature of an ablation area can be monitored in the ablation process in real time. Micropores are formed in the balloon, and cool saline filling cooling can be carried out on the blood vessel tissue outside the ablation area in the ablation process to avoid excessive ablation. One end of the outer catheter can be bent freely, and thus operation and control in the blood vessel can be carried out conveniently. The functional handle can control the bending of the outer catheter, the moving of the balloon relative to the outer catheter and is connected with an external ablation device. According to the balloon expanding renal artery sympathetic nerve ablation catheter, the double-electrode ablation is carried out, ablation points are connected in a spiral mode, and all the sympathetic nerves of the renal artery are isolated effectively. Meanwhile, the ablation temperature is controllable, and due to the fact that the contact between the electrodes and the blood is isolated by the balloon, the purpose of ablating the sympathetic nerves of the renal artery can be achieved with low energy.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a renal artery sympathetic nerve ablation catheter for interventional treatment of hypertension. Background technique [0002] Refractory hypertension refers to the inability to reach the target blood pressure despite the highest tolerated dose of drug therapy (combination therapy of three antihypertensive drugs including diuretics). These patients are at high risk for major cardiovascular events. [0003] In April 2009, Krum et al. reported a new technique of percutaneous catheter renal sympathetic nerve radiofrequency ablation for the treatment of refractory hypertension. This method cuts off the sympathetic nerve of the kidney through radiofrequency ablation without affecting the innervation of other abdominal, pelvic or lower extremity nerves, and achieves the purpose of reducing blood pressure while avoiding serious complications. In November 2010, a prospective, randomized ...

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Problems solved by technology

And the study found no surgery-related complications or adverse events, and the postoperative renal function of the patient was in good condition

[0004] As a new technology, there is still a lack of matching equipment, and there are many problems in the current clinical products. The more clinically used product is the Symplicity ablation system of Medtronic Company. Because there is only one electrode for ablation, the operation Complicated, long radiofrequency ablation time and other issues

[0005] CN102274074A discloses a multi-polar open radiofrequency ablation catheter. One end of the catheter is an open structure. When the renal artery is ablated to the sympathetic nerve, it is prone to the problem that it cannot be closely attached to the inner wall of the blood vessel, resulting in the possibility of ablation failure. At the same time, the ablation point Discontinuous, prone to problems such as incomplete sympathetic nerve ablation and poor ablation effect

CN201469401U discloses a helical renal artery sympathetic radiofrequency ablation electrode catheter. The electrode is a helical structure with a simple design and is difficult to operate. It also has the problem of not being able to closely fit the inner wall of the blood vessel, resulting in the risk of ablation failure

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