Balloon type flexible microwave ablation catheter and ablation system and method using same

Abstract

A balloon-type flexible microwave ablation catheter and an ablation system and method using the same. The balloon-type flexible microwave ablation catheter includes a flexible tube body and a microwave radiation unit; wherein a cooling liquid pipeline and a microwave signal transmission tube are arranged in the flexible tube body The microwave radiation unit is set at the far end of the flexible pipe body, including a microwave radiator and a number of inflatable balloons, wherein the microwave radiator is connected with the microwave signal transmission line for transmitting the microwave signal, and the microwave radiator is flexible The microwave radiator is located inside an expandable balloon or between two expandable balloons, and the expandable balloon can control the size of its expansion through the hydraulic pressure of the cooling liquid pipeline. Due to the flexibility and bendability of the balloon-type flexible microwave ablation catheter of the present invention, the microwave applicator can pass through the natural cavity in the human body, such as the respiratory tract, blood vessels, etc. irreparable damage.

Description

technical field [0001] The invention belongs to the field of microwave ablation medical devices, in particular to a balloon-type flexible microwave ablation catheter and an ablation system and method using the same. Background technique [0002] With the prolongation of life expectancy, my country has gradually entered into an aging society, and the prevalence rate of hypertension in the elderly has reached 40% to 60%. Despite the increasing number of safe and effective drugs, the current status of hypertension treatment is still poor. According to the "China Cardiovascular Disease Report 2016" data released in 2017, the prevalence of cardiovascular disease in China is currently on the rise. The number of patients with cardiovascular disease is about 290 million, of which there are about 270 million hypertensive patients. The absolute "big family" of cardiovascular disease, the mortality rate of cardiovascular disease exceeds that of tumors and other diseases, ranking first...

AI Technical Summary

Problems solved by technology

[0005] However, radiofrequency ablation of the renal artery ablates the inner wall of the renal artery point by point, and cannot form a ring-shaped, continuous ablation zone to block sympathetic nerve conduction. High dependence, which can easily lead to incomplete ablation and treatment failure

In recent years, cryoablation balloon catheters have been introduced clinically to perform cryoablation of renal artery sympathetic nerves. Although this catheter can perform cryoablation of renal arteries, clinically there are still shortcomings of incomplete cryoablation and repeated illnesses

In addition, the frozen balloon blocks the renal artery for a long time to block the blood flow, which may cause ischemic necrosis of the kidney, bringing unacceptable medical accidents to the patient, and the risk is extremely high.

The existing cryoballoon catheter directly sprays the refrigerant into the balloon, which is easy to cause the balloon to burst, and the risk is extremely high

When the refrigerant is sprayed into the balloon, the wall of the balloon is gradually cooled, which makes the cooling speed of the balloon slower

At the same time, the rewarming time of the balloon wall after the treatment is also very long, which will inevitably prolong the operation time and increase the pain suffered by the patient.

[0006] When radiofrequency ablation catheters and cryoablation catheters are used to treat atrial fibrillation and pulmonary veins are isolated to treat atrial fibrillation, there are also the above shortcomings and deficiencies: incomplete ablation, recurrence of atrial fibrillation, recovery of electrical conduction, long operation time, and greater dependence on the experience of the operator high

[0007] Both radiofrequency ablation and cryoballoon ablation are physical contact ablation. It is often difficult to completely adhere to the inner wall of the renal artery and the vestibular vessel of the pulmonary vein which are not smooth. Incomplete ablation

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