Novel tumor cryoablation catheter

Abstract

The invention relates to a novel tumor cryoablation catheter. The novel tumor cryoablation catheter comprises a bag body and a pipe connected with the near end of the bag body, the pipe is externally wrapped with a thermal insulation layer and comprises an air inlet pipe and an air return pipe, the far end of the air inlet pipe extends into the bag body, the bag body comprises a far-end face located at the far end, in the ablation process, the air inlet pipe inputs a cold medium to strut the bag body, the far-end face is unfolded, a plane is formed at the far end of the bag body, the near-end part of the bag body bulges to be in a hemispherical shape, and the cold medium flows back through the air return pipe. According to the novel tumor cryoablation catheter, the air inlet pipe extends into the bag body, it is guaranteed that a cold source can be released sufficiently, heat exchange of the cold source is enhanced, and the freezing effect is improved; when the bag body is completely filled, the far end of the bag body is rarely quite little, it is guaranteed that the end face of the far end of the bag body is plane, point contact between a machine and tissues of the human body is avoided, the freezing range is enlarged, the freezing effect is improved, and a better effect is achieved for application of larger gross tumor volume.

Description

Technical field: [0001] The invention belongs to the field of medical devices, and in particular relates to a novel tumor cryoablation catheter. Background technique: [0002] According to the report of the World Health Organization, in 2008, there were about 12.7 million new cancer patients and 7.6 million cancer deaths in the world, especially in developing countries, the number of new cancer cases reached 56%. According to the "2012 China Cancer Registration Annual Report" released by the China National Cancer Registration Center, there are about 3.5 million new cancer cases in China every year, and about 2.5 million cancer deaths. What is worrying is that in the next 10 years, the incidence and mortality of cancer in China will continue to rise. It is estimated that by 2020, the global cancer incidence rate will increase by 50%, that is, 15 million new cancer patients will be added every year. Not only that, the number of deaths from cancer is also rising rapidly aroun...

AI Technical Summary

Problems solved by technology

[0008] At present, one class of cryoablation products for tumor treatment uses metal probes. Since the metal probes are made of hard materials and the range of cryoablation is small, the scope of application of this type of product is greatly reduced; another type of cryoablation products is Balloon cryoablation catheters, this type of product utilizes the characteristics of the balloon, the effective freezing area is set as the side wall of the balloon, and the balloon parts are made of plastic materials. When inflated during use, the balloon will inevitably collapse The deformation causes the balloon wall to have a curved surface, and then when the curved surface fits with the tissue wall, it is point contact rather than surface contact. This situation has a great impact on cryoablation and reduces the effective range of freezing

[0009] Patent US20140058369A1 describes a cryoablation balloon catheter with different cold source distributions. This patent proposes a variety of new structures for cold sources to enter the balloon. The distal end of the balloon catheter with this structure cannot be fixed. The distal end of the balloon lacks important support, and the balloon part lacks strong rigidity. When this structure enters the use channel or some narrow lumens, or encounters resistance during advancement, the balloon is easily deformed and folded, increasing the placement resistance to entry, and even rupture and damage to the balloon and catheter due to friction, which increases the difficulty of operation and the risk of use

At the same time, during use, when the balloon is attached to the wall of human tissue, due to the lack of support at the distal end of the balloon, the air intake structure inside the balloon deviates from the center of the balloon, and the freezing temperature distribution is uneven, which affects the freezing effect

[0010] Patent US20120016355A1 describes a cryoablation balloon catheter and related methods. The catheter is designed with a guide wire channel inside the balloon and can be used as a support for the delivery of the balloon, which solves the problem of delivery of the balloon catheter to a certain extent. However, this design still has some limitations. This design makes the center of the balloon at the distal end of the cryoablation catheter occupied by the guide wire channel. When the cold source enters the balloon, the cold source is biased to the side of the balloon, thereby freezing The effect is uneven, affecting the freezing effect

Moreover, the cold source directly enters the balloon, and the cold source has a greater impact on the balloon, which requires higher safety requirements for the balloon.

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