Cryoablation catheter and cryoablation device with mapping function

Abstract

The invention relates to the field of cryoablation, in particular to a cryoablation catheter with a mapping function. The cryoablation catheter comprises a far-end tube, an ablation balloon and a mapping balloon, wherein the far-end tube is a far-end section of the catheter; the ablation balloon is mounted at the end of the far-end tube and used for cryoablation; and the mapping balloon is locatedat the front end of the ablation balloon and has expansion and contraction functions, and a plurality of mapping electrodes are arranged on the surface of the mapping balloon. The invention aims to provide the cryoablation catheter which can improve the mapping effect of cryoballoon ablation for atrium diseases.

Description

technical field [0001] The invention relates to the field of cryoablation, in particular to a cryoablation catheter with a mapping function. Background technique [0002] Radiofrequency ablation catheters or cryoablation catheters have been widely used clinically to treat arrhythmias in the atrium, such as atrial premature contraction, atrial flutter, bypass tachycardia, atrial fibrillation, and AV node reentry tachycardia , Ventricular arrhythmias in the ventricle, such as premature ventricular contractions, ventricular tachycardia, ventricular fibrillation, and heart diseases such as long-term QT ​​syndrome. [0003] For the treatment of most arrhythmias, radiofrequency ablation is safe and effective, but radiofrequency ablation still has limitations and disadvantages. Radiofrequency energy can destroy the structure and integrity of endothelium and tissue, and easily lead to the formation of thrombus and embolism. Excessive heat in radiofrequency can cause an increase in...

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Problems solved by technology

[0004] In order to achieve a deeper ablation depth, higher ablation energy will be used clinically, which will often cause local overheating of myocardial tissue and cause scab, thus affecting the effectiveness and safety of the operation. The saline cools down the ablation part, and a series of complications will occur due to the continuous delivery of saline to the patient during the operation

[0005] At the same time, the application of radiofrequency ablation in the treatment of atrial fibrillation faces many clinical problems: such as the risk of cardiac perforation, the temperature inconsistency between the surface layer of the myocardium and the interior, phrenic nerve injury, ablation carbonization / coagulum formation, a long learning curve for ablation of atrial fibrillation, and surgical Difficulty and technical requirements are very high, it is difficult for different operators to obtain consistent results, and the success rate varies greatly

[0009] In the current cryoballoon ablation device, the ablation part is an ablation balloon, which can expand and contract, and realize the low temperature on the surface of the balloon through the circulation of the freezing medium, and complete the cryoablation. The front end of the ablation part is a mapping part, which is The helical and stretchable structure inside the ablation part, because the inner wall of the atrium and the inner wall of the junction between the atrium and the pulmonary vein is indefinite in shape and has strong contractility, and the ability of the helical mapping structure to expand outward is not strong, so that The current mapping effect of the helical mapping part of cryoballoon ablation is unstable and the mapping effect is not good

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