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A cryoablation catheter and system

A technology for ablation of catheters and cold sources, applied in catheters, cooling surgical instruments, medical science, etc., can solve the problems of damaged surrounding tissues, high cost, complex structure, etc., to reduce damage, prevent heat transfer, and accelerate rewarming Effect

Active Publication Date: 2020-06-12
CRYOFOCUS MEDTECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this heat preservation device adds a lot of parts and has a complex structure, which is only suitable for the treatment of specific target tissues, and the cost is relatively high.
[0006] Although the existing cryoablation catheters fix the inner and outer balloons on the catheter shaft respectively, and fill the inner balloon with refrigerant to achieve the purpose of cooling, but because there is no effective heat-resistant cavity, the formed ice ball often Can cover the area around the treatment site, which can damage surrounding tissues and lead to complications

Method used

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  • A cryoablation catheter and system
  • A cryoablation catheter and system
  • A cryoablation catheter and system

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Such as figure 1 As shown, a cryoablation catheter of the present invention includes: a cold source connector 1, a control handle 2, a freezing unit 3, a flexible connecting tube 4 and a tube body 5, and the tube body 5 having a distal end and a proximal end includes Extended cold source air intake cavity 51 and cold source return air cavity 52; the refrigeration unit 3 is arranged on the distal part of the pipe body 5, including The cavity 52 is in fluid communication with the first balloon body 31 and the second balloon body 32 disposed outside the first balloon body 31 , and the second balloon body 32 expands with the first balloon body 31 . The length of the first capsule 31 is smaller than that of the second capsule 32 . A part of the wall of the first capsule body 31 and the second capsule body 32 is in a bonded state, and the bonded part of the wall of the first capsule body 31 and the second capsule body 32 is frozen energy For the passage to the treatment sit...

Embodiment 2

[0078] The difference between this embodiment and Embodiment 1 is that a support structure is provided between the first balloon 31 and the second balloon 32 adjacent to the non-treatment area. When the first balloon 31 And when the second capsule 32 expands, the support structure can support the cavity 6 for isolating energy transmission formed between the first capsule 31 and the second capsule 32, thereby ensuring energy isolation The shape of the transmitted cavity 6 is stable and reliable.

[0079] In one embodiment, the support structure 33 is a balloon 331 disposed at the proximal end of the first balloon body 31 . Such as figure 2 As shown, the tubular body 5 also includes a balloon filling cavity 54 extending axially therethrough, and the balloon filling cavity 54 is in fluid communication with the balloon 331 . During the treatment, a proper amount of refrigerant is first injected into the first capsule 31 to expand the first capsule 31 and the second capsule 32 ....

Embodiment 3

[0081] The difference between this embodiment and Embodiment 2 is that: image 3 As shown, the support structure 33 can be made of one or more memory alloy wires 332 with a preset shape, and the support structure 33, the first balloon body 31 and the second balloon body 32 are in a compressed state before reaching the lesion site . When the first balloon 31 is delivered to the lesion, the supporting structure 33 can return to a preset shape, thereby supporting. Then the cryoablation treatment is started, and the refrigerant is injected into the first capsule 31 to absorb heat in the treatment area to achieve the effect of cryoablation. The memory alloy wire is preferably nickel-titanium wire. In a preferred embodiment, the preset shape includes a spiral shape (such as Figure 12a shown), cage (such as image 3 shown) or umbrella (such as Figure 16 shown). The memory alloy wire is shaped into a spiral shape, a cage shape or an umbrella shape through heat treatment.

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Abstract

The invention relates to a cryoablation catheter and a cryoablation system. The cryoablation catheter comprises: a pipe body and a freezing unit; The freezing unit is arranged on the distal part of the tube body, and includes a first bladder in fluid communication with the cold source air inlet cavity and the cold source return air cavity and a second bladder arranged outside the first bladder body, the length of the first balloon body is less than the length of the second balloon body, when the first balloon body and the second balloon body are expanded, the first balloon body and the second balloon body are A cavity for isolating energy transmission is formed between the bodies, so as to prevent energy transmission in the space of the freezing unit corresponding to the cavity. The cryoablation catheter of the present invention can effectively limit the cryogenic energy release area, thereby reducing the probability of complications, and has wide application.

Description

technical field [0001] The invention belongs to the field of cryoablation medical equipment, and in particular relates to a cryoablation catheter and a system. Background technique [0002] Cryoablation is the destruction of cells by forming ice balls inside and outside cells through low temperature. During cryoablation, the cryoprobe is placed on the surface of the tissue, and the low temperature is induced by refrigeration, so that ice balls are formed inside and outside the cells around the probe. As the temperature drops, the cells inside the puck are irreversibly damaged. The cryoablation injury process can be divided into three stages: (1) freezing / rewarming period; (2) hemorrhage and inflammation period; (3) fibrosis period. [0003] Cryoablation is a useful treatment modality in a wide range of catheter-based interventional procedures. For example, cryoablation can be used to ablate the vestibule of the pulmonary vein, resulting in electrical isolation of the pulm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B18/02
CPCA61B18/02A61B2018/00041A61B2018/0025A61B2018/0262A61B2018/00101A61B2018/00255A61B2018/00267A61B2018/0212A61B2018/00577A61B2018/00375A61B2018/00261
Inventor 刁月鹏杨东辉李攀
Owner CRYOFOCUS MEDTECH (SHANGHAI) CO LTD
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