Cryoablation catheter and cryoablation system

Abstract

The invention provides a cryoablation catheter and a cryoablation system. The cryoablation catheter comprises a catheter body and freezing balloons, wherein a refrigerant inlet chamber, a main refluxing chamber and a plurality of auxiliary refluxing chambers are arranged in the catheter body, the refrigerant inlet chamber, the main refluxing chamber and the auxiliary refluxing chambers all communicate with the freezing balloons, and the auxiliary refluxing chambers are used for regulating the internal pressure of the freezing balloons in an auxiliary manner. Based on the condition that cold energy of the cryoablation catheter is adjustable and controllable, the internal pressure of the freezing balloons can be stably regulated and controlled through employing a multi-chamber refluxing mode, the internal pressure of the freezing balloons of various dimensions can be in a safe use range, the clinical safe use of cryoablation catheters of various specifications is achieved, and customized / user-friendly treatment of different requirements is achieved. In addition, through additionally arranging the auxiliary refluxing chambers, the accuracy of control on flow rate can be further improved, the problem of single-chamber regulating that over regulation easily occurs is avoided, and the safety of cryoablation is improved.

Description

technical field [0001] The invention relates to the technical field of cryoablation, in particular to a cryoablation catheter and a cryoablation system. Background technique [0002] Cryoablation, often used to treat various arrhythmias or nerve ablation, including atrial fibrillation, renal artery ablation, etc. For example, many arrhythmias are caused by or involve abnormal electrical currents conducted through cardiac tissue. In cryoablation, the tissue is cooled through the cryoablation catheter until the abnormal electrical conduction is eliminated or otherwise deemed to be improved, thereby eliminating the risk of cardiac arrhythmia. For example, some abnormal currents may originate within one or more pulmonary veins, in which case the ostia or sinuses of the pulmonary veins may be frozen until abnormal current conduction in the pulmonary veins is isolated from the left atrium or other cardiac tissue. [0003] Different shapes and sizes of tissues to be ablated requi...

AI Technical Summary

Problems solved by technology

[0003] Different shapes and sizes of tissues to be ablated require different cooling capacity for cryoballoon ablation. If the required cryoballoon surface temperature (too high or too low) cannot be obtained during the operation, the ablation may be stopped early, resulting in this failed ablation

The mainstream cryoballoons on the market are usually made of polymer materials (such as PET). At present, the size of the largest cryoballoon is 28mm, and the main unit of the cryoablation system has a fixed flow or cold output to the cryoballoon, which cannot be cooled. Volume control, the pressure resistance of cryoablation system is generally limited in low temperature environment, when cooling capacity or flow output is required, or when larger cooling capacity or larger size cryoballoon is required, the main unit of the cryoablation system will increase the cooling capacity. The cooling amount or flow rate of the agent will increase the pressure fluctuation inside the cryoballoon, increasing the risk of cryoballoon rupture

Moreover, in the traditional cryoballoon cryoablation catheter, the return path of the refrigerant has only a single cavity, and the accuracy of the single cavity to adjust the internal pressure of the cryoballoon by controlling the return proportional valve is too low, and it is easy to overshoot, which affects the cryoablation. Ablation Safety

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