An Interpolar Cryoablation Catheter

Abstract

The invention relates to the field of cryoablation, in particular to an interpolar cryoablation catheter, comprising a flexible insertion tube having a distal end for insertion into a body cavity of apatient; more than two electrodes spaced apart and insulated with each other at the distal end, with the electrodes having an outer surface for contacting cardiac tissue of a patient, and two or moreelectrodes being configured to map or electrically stimulate cardiac tissue in cooperation with each other; a circulating freezing chamber disposed within the flexible insertion tube and extending from the distal end of the flexible insertion tube into a spacing of the electrodes, with the spaced cavities being spaced from the heart tissue and the cavities containing the circulating freezing medium. The invention aims at providing an inter-polar cryoablation catheter with mapping and stimulation functions, and reducing operation difficulty, pain of the patient and cost under the condition ofensuring cardiac tissue ablation effect, improving safety and reducing possibility of complications of the patient.

Description

technical field [0001] The invention relates to the field of cryoablation, in particular to an interpolar cryoablation catheter. Background technique [0002] Arrhythmia is one of the common heart diseases in the world. There are many types of arrhythmias, including arrhythmias in the atrium, such as atrial premature contraction, atrial flutter, bypass tachycardia, atrial fibrillation, and AV node Reentrant tachycardia, intraventricular ventricular arrhythmias such as premature ventricular contractions, ventricular tachycardia, ventricular fibrillation, and long-term QT ​​syndrome, and disorders involving slow heart rhythms that can originate in the conduction system of the heart Chronic arrhythmia, radiofrequency ablation catheters or cryoablation catheters have been widely used clinically to treat such diseases. [0003] Before ablation, it is necessary to accurately locate the lesion site. The current commonly used technique is to place an additional mapping catheter bef...

AI Technical Summary

Problems solved by technology

[0005] In this way, electrodes widely used at present are electrodes with a spherical shape and cylindrical electrodes with spherical ends, which have a small diameter and exhibit excellent operability. However, these electrodes have the following disadvantages: the output power is small, the electrode Inability to achieve adequate contact with or fixation to the organism, minimal cooling with circulating blood, and ablation limited to a small area around the area pushed into by the tip electrode

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

[0006] At the same time, the current conventional ablation electrodes cannot directly perform ablation after stimulation and mapping to the target position without moving the ablation electrode position, or an additional mapping catheter is required for mapping stimulation during ablation.

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