Multi-electrode ablation catheter

Abstract

The invention relates to a multi-electrode ablation catheter which comprises a catheter, electrodes distributed on the catheter, a wire connected onto the electrodes to transmit signals and radio frequency energy and a handle used for adjusting the shape of the catheter. The electrodes comprise basket-shaped electrodes and head electrodes arranged at the farthest end of the catheter. The catheter comprises a basket-shaped section with the basket-shaped electrodes, a flexible transition section and a main body section coupled to the handle, wherein the basket-shaped section is formed by a center catheter and a plurality of branch catheters evenly distributed around the center catheter and connected with the center catheter at two ends. The basket-shaped electrodes are formed by electrodes distributed on the branch catheters, and contracting, base state and stretching of the branch catheters relative to the center catheter are achieved by controlling the handle. The catheter can be contracted to conveniently enter the renal artery vessel to be transferred to the position nearby a target spot of a complex structure, the catheter can extend after the catheter reaches the place to cling to the vessel wall completely, protrusions are not formed in the middle, the problem that the vessel is irritated to be narrow due to the fact that a certain position is ablated too much is solved, and blood flow of the renal artery is not affected.

Description

technical field [0001] The invention relates to the technical field of medical instruments. More specifically, the present invention provides a multi-electrode ablation catheter. Background technique [0002] Refractory hypertension, also known as refractory hypertension, refers to hypertension that cannot be effectively controlled by lifestyle modification and 3 or more antihypertensive drugs (including a diuretic). Experimental data prove that hypertension is related to the high excitability of renal sympathetic nerves in patients. Blocking renal sympathetic nerves can not only reduce blood pressure, but also have an impact on chronic organ-specific diseases with excessive activation of sympathetic nerves; blocking renal sympathetic nerves can also improve Left ventricular hypertrophy and insulin resistance. [0003] Congestive heart failure (CHF) is a condition that occurs when the heart is damaged and blood flow to the body's organs is reduced. If blood flow is suffic...

AI Technical Summary

Problems solved by technology

The safety of the multi-electrode open type entering the renal artery is not guaranteed, and it is not easy to control its bidirectional movement in the renal artery

[0009] The international patent application with the publication number WO2011 / 060339A1 introduces a four-electrode ablation catheter, which can realize the ablation of four targets at one time, but cannot achieve accurate ablation for the renal artery ostium and the complicated renal artery vessel position

[0010] The Chinese patent application with the application number 200610150659.0 and the publication number CN1947810A introduces a wire basket electrode catheter for the ablation of the pulmonary vein ostium. This catheter cannot be used for the ablation of the renal sympathetic nerve at the renal artery because the electrode of the catheter is too dense and thus very prone to renal artery stenosis

In addition, the protrusion in the middle of the electrode section of the catheter is too large, which will cause too much damage to the renal artery

[0011] The international patent application with the publication number WO2007 / 003058 discloses an ablation catheter that uses a balloon to expand four electrodes. The four electrodes of the ablation catheter are on the same plane, which is likely to cause stenosis during ablation in the renal artery. , the expanded balloon will block the blood flow of the renal artery, which will have a certain impact on the kidney

[0012] The multi-electrode ablation catheter developed by the prior art as mentioned above cannot adapt to targets with complex structures and can easily cause arterial stenosis during ablation

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