Multipolar open radiofrequency ablation catheter

Abstract

A multipolar open radiofrequency ablation catheter is used for sympathetic nerve removal in renal arteries, comprising: a control handle; a catheter body, one end of which is fixed to the control handle; an open frame, including at least one tendon that can be elastically deformed, each One end of the rib is fixed to the other end of the catheter tube body, and the rib extends outwardly from the other end of the catheter tube body in a divergent shape, and electrodes are arranged on each rib, and each electrode can be used to extract nerve electrical signals and ablate , each electrode is connected with a wire, the wire extends along the frame, extends through the catheter tube body to the control handle, and is electrically connected to the control handle; the storage sheath, the catheter tube body passes through the storage sheath, and one end of the storage sheath is connected to the control handle The handle; the storage sheath can move relative to the catheter tube body, so that the other end of the storage sheath moves on the open frame, so that the open frame can elastically contract and be stored in the storage sheath and released from the storage sheath. The radiofrequency ablation catheter has the advantages of simple operation, short operation time, accurate and controllable ablation, and the like.

Description

technical field [0001] The invention relates to an electrode catheter, in particular to a radio frequency ablation catheter for sympathetic nerve removal in renal arteries. 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] The latest animal and clinical experimental data prove that the radiofrequency ablation of the renal sympathetic nerve with percutaneous catheter can significantly...

AI Technical Summary

Problems solved by technology

However, the tightness of electrode adhesion cannot be adjusted, and the design of monitoring the ablation temperature cannot be implemented, so it is difficult to ensure the degree of ablation, and there are risks such as failure to achieve curative effect when the degree of ablation is too shallow, or perforation caused by the degree of ablation; WO2010129661 and WO2008061152 also adopted multi-stage ablation, The same degree of adhesion is difficult to guarantee

The single-point ablation of WO2007121309 and WO2010078175 is difficult to accurately select the ablation site and determine the curative effect in time, and it is necessary to adjust the position of the catheter tip electrode to achieve effective abutment, which requires high operation

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