Uninterrupted blood flow cryoablation system, and cryoablation method

Abstract

The invention relates to an uninterrupted blood flow cryoablation system, which comprises a balloon catheter, a bracket catheter and a guide wire, wherein the balloon catheter and the bracket catheterare connected through the guide wire; the balloon catheter comprises an abnormal-shaped balloon, a guide pipe, an injection adapter and a handle, and the abnormal-shaped balloon, the guide pipe, theinjection adapter and the handle are connected in sequence; the abnormal-shaped balloon is internally divided into three inner cavities, wherein the three inner cavities are independently connected with the injection adapter and the handle through the guide pipe; the bracket catheter comprises a pushing rod internally provided with a wire guiding cavity; the pushing rod comprises a bracket component, an inner pipe, an outer sheathing pipe and a sealing switch; and the guide wire comprises a pre-shaping structure positioned on the front end of the guide wire. According to the uninterrupted blood flow cryoablation system disclosed by the invention, through the guide wire, the guidance insertion of the cryoablation system is improved, through the supporting of the bracket component, a stablechannel is formed on the inner side of the balloon, vascular thrombosis due to balloon dilatation compression can be avoided, meanwhile, liquid nitrogen can be continuously input under an uninterrupted blood flow situation, the liquid nitrogen can be repeatedly and circularly pumped out and injected, and consequences of distal critical ischemia and the like due to target vessel occlusion during anoperation can be avoided.

Description

technical field [0001] The invention relates to medical device technology, which is applied to cardiothoracic vascular interventional operations, in particular to a cryoablation system and a cryoablation method without interrupting blood flow. [0002] technical background [0003] In the clinical practice of cryoballoon ablation of atrial fibrillation, the catheter is usually sent to the target pulmonary vein through atrial septal puncture, and the cryoablation instrument delivers liquid N2O through the coaxial connection cable and the ultra-fine lumen (injection tube) of the cryoablation catheter body. to the inner balloon of the balloon catheter. After the balloon is inflated and X-rays are used to determine the obstruction of the balloon, the ablation is performed. During the ablation, the liquid N2O inside the balloon is vaporized, absorbing the heat of the surrounding tissue, and the target tissue is rapidly frozen to achieve the ablation effect. Among them, the cryoab...

AI Technical Summary

Problems solved by technology

[0004] Currently, cryoballoons widely used clinically are only aimed at the potential isolation of pulmonary veins in atrial fibrillation, so the target blood vessels for ablation are only aimed at pulmonary veins, and cannot be widely used in cryoablation of blood vessels in other fields (such as renal artery, pulmonary artery and its branch arteries, etc.) ), the main limiting factors include: 1. During cryoablation, the larger the adjoining area between the tip of the catheter (i.e. the balloon) and the tissue is, the more heat will be removed. The blood flow must be interrupted, so that when the ablation of target vessels such as the renal artery, pulmonary artery and its branch arteries is performed, artificial embolism is easily caused; 2. The main limitation of traditional cryoablation therapy is that the indications are narrow, and the traditional cryoballoon catheter is Specifically designed for the anatomical structure of the pulmonary vein, currently mainly used for pulmonary vein isolation

For paroxysmal atrial fibrillation patients with trigger lesions not originating from pulmonary veins (such as superior vena cava, coronary sinus ostium, etc.), other ablation catheters can only be used for ablation; , the ablation and outcome are relatively limited, and the slice damage of the traditional cryoballoon cannot be applied to the desympathetic treatment of pulmonary arterial hypertension due to many limitations; , often combined with severe complications such as severe intraoperative pain, and there is no effective and monitorable intraoperative endpoint, and the traditional cryoballoon slice injury cannot be applied to the desympathetic ablation of the renal artery due to many limitations; 5. The traditional balloon has a spherical structure rather than a tube, and the ablation is only limited to the mouth of the target vessel, and the distal end of the vessel cannot be ablated

6. Since the catheter is not equipped with blood flow diversion holes and catheters, there is no suction or injection function

After the sheath is delivered into the target vessel, the air bubbles or thrombus that may exist in the sheath cannot be aspirated, and anticoagulant preparations (such as heparin saline) and other therapeutic drugs cannot be injected into the sheath, nor can real-time angiography be realized

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