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Balloon catheter

A balloon catheter and balloon technology, applied in the field of balloon catheter, can solve problems such as inability to use pulmonary vein electrical isolation, liquid boiling, cell heating necrosis, etc.

Active Publication Date: 2007-01-24
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the medical device described in Patent Document 2 only heats and kills the cells around the punctured part as a whole, and cannot be used for delicate and delicate operations such as electrical isolation of pulmonary veins.
Furthermore, depending on the shape of the two high-frequency energization electrodes provided inside the balloon and the distance between them, there is also a problem that the liquid inside the balloon boils.

Method used

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  • Balloon catheter
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] The length from the front end of the balloon 2 to the rear end of the balloon 2 is 30 mm, the maximum outer diameter of the rear end side is 30 mm, and the film thickness is 160 μm.

[0132] The balloon 2 is made by a dipping method. The dipping method is to dip a glass balloon forming mold having a mold working surface corresponding to the required balloon shape in a polyurethane solution with a concentration of 13%, and heat to evaporate the solvent. A method of forming a polyurethane polymer film on the surface of a molding die.

[0133] As the outer cylindrical shaft 3 of the catheter 1 , a 12Fr polyvinyl chloride tube containing 30% of barium sulfate with an inner diameter of 2.7 mm and a total length of 800 mm was prepared. As the metal pipe 3A, a stainless steel pipe having a diameter of 2.8 mm, a length of 7 mm, and a sandblasted outer surface was prepared. After a part of the metal pipe 3A is inserted and fitted inside the front end portion of the outer cylind...

Embodiment 2

[0151] In the ablation catheter of Example 1, a catheter in which a metal guide wire is inserted into the hollow portion of the inner cylindrical shaft 4 is prepared. Hereinafter, this catheter is referred to as the ablation catheter of Example 2. The heat generation of the metal guidewire when the ablation catheter of Example 2 was used was investigated.

[0152] The ablation catheter of Example 2 was immersed in a water tank filled with physiological saline at 37°C. The high-frequency power supply wires 12A and 12B are connected to the high-frequency power supply device 10 . Inside the balloon 2, a contrast medium (ioxalic acid injection: product name: ヘキサブリツクス 320) diluted with physiological saline was injected to a 50% liquid, and the balloon 2 was inflated to the rear end side of the balloon 2. The maximum outer diameter is 30mm.

[0153] As the guide wire, a wire made of SUS304 with a diameter of 0.025 inches (about 0.6 mm) and a length of 1500 mm was used. A guide w...

Embodiment 3

[0160] The lengths of the high-frequency energization electrodes 5A and 5B of the ablation catheter of Example 1 in the catheter 1-axis direction were each set to 1 mm. The surface areas SA and SB of the high-frequency energization electrodes 5A and 5B of this catheter are about 20 mm, respectively. 2 . Hereinafter, this catheter is referred to as the ablation catheter of Example 3.

[0161] The ablation catheters of Comparative Example 2, Example 1, and Example 3 were immersed in a water tank filled with physiological saline at 37° C., and the high-frequency power supply leads 12A, 12B were connected to the high-frequency power supply device 10 . Inject the contrast agent (ioxalic acid injection: product name: ヘキサブリツクス 320) diluted to 50% with physiological saline into the balloon 2 of all catheters, and inflate it to the rear end of the balloon The maximum outer diameter of the side is 30 mm.

[0162] The frequency of the high-frequency power supply device 10 was set to 1...

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Abstract

In this method, a high-frequency current is passed between electrodes arranged in pairs in the balloon at intervals to heat the liquid in the balloon, and the heating ablates the living tissue in contact with the balloon via the balloon The ablation catheter is characterized in that the surface area of ​​each of the electrodes is greater than or equal to 20 mm2, or the potential detection electrode for detecting the potential of the ablation site is provided outside the balloon on at least one of the front and rear of the balloon .

Description

technical field [0001] The present invention relates to balloon catheters. More specifically, it involves inserting a balloon catheter into a patient's body, and heating the liquid injected into the balloon by means of medium heating and Joule heat by high-frequency current while the balloon is in close contact with the target lesion. , a balloon catheter that heats the target lesion through the balloon and ablates the target lesion by the heating. This balloon catheter is called a balloon ablation catheter. Background technique [0002] Ablation catheters have been developed for the treatment of arrhythmias. Patent Document 1 describes a balloon ablation catheter for pulmonary vein electrical isolation for treating arrhythmia. When using this ballooned ablation catheter for electrical isolation of pulmonary veins, such as Figure 8 As shown, the inflatable and deflated balloon 52 arranged at the front end side of the catheter 51 is subcutaneously introduced into the infe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B18/12A61B18/04A61B18/14
CPCA61B18/1492A61B18/04A61B2018/0022A61B2018/00702A61B2018/046A61B2018/00791A61M29/02
Inventor 松熊哲律山崎善治
Owner TORAY IND INC