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a laser catheter

A laser and catheter technology, used in catheters, medical science, surgery, etc., can solve problems such as reducing the incidence of blood vessel wall damage, inability to ablate, and blood vessel wall damage, and achieve the effect of preventing non-target tissue damage and improving ablation efficiency.

Active Publication Date: 2021-04-23
DONGZHIMEN HOSPITAL OF BEIJING UNIV OF CHINESE MEDICINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (5) Laser ablation. When laser ablation tissue, it is easy to cause damage to the blood vessel wall, such as blood vessel perforation and dissection. The penetration depth of excimer laser can be limited to 50-100 microns, which reduces the incidence of blood vessel wall damage. Molecular laser catheters are not yet able to ablate tissue that enters the lumen

Method used

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  • a laser catheter
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as Figure 1~2 Among them, a laser catheter includes a tube body 1, the tube body 1 includes a head end 2, a tail end 3, a tube wall 4 and a lumen 5, and a plurality of circularly distributed optical fibers 6 are fixed on the tube wall 4 of the tube body 1 , the optical fiber 6 constitutes at least 2 layers of annular structure, forming an inner fiber layer 61 and an outer fiber layer 62, wherein the end of one end of the outer fiber layer 62 emits laser light toward the head end 2 of the tube body 1 to form an axial laser 16. further as Figure 3-16 Among them, the inner optical fiber layer 61 extends to a preset distance from the catheter head end 2 in the tube wall 4, and then the optical fiber bend 7, or the optical fiber side hole 18, or the optical reflection element, or the combined optical fiber bend 7, or the optical fiber side hole is set. 18 or the optical reflective element is set to change the direction of the laser, so that the laser is emitted from ...

Embodiment 2

[0049] On the basis of Example 1, the preferred scheme is as image 3 Among them, the inner optical fiber layer 61 extends through the tube wall 4 to a preset distance from the head end 2 of the tube body 1 to set an optical fiber bend 7, the head end of the optical fiber bend 7 faces the lumen 5, and the laser transmitted through the inner optical fiber layer 61 The direction is changed by the fiber bending 7 to the lumen 5 .

Embodiment 3

[0051] On the basis of Example 1, the preferred scheme is as Figure 4 Among them, the inner optical fiber layer 61 extends through the tube wall 4 to a preset distance from the head end 2 of the tube body 1 to set an optical fiber side hole 18, the optical fiber side hole 18 faces the lumen 5, and the laser transmitted through the inner optical fiber layer 61 passes through the optical fiber The side hole 18 projects into the lumen 5 .

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Abstract

The invention relates to the field of medical equipment, and provides a laser catheter, which includes a tube body, the tube body includes a head end, a tail end, a tube wall and a lumen, and a plurality of circularly distributed optical fibers are arranged in the tube wall of the tube body. The optical fiber forms at least 2-layer ring structure, wherein the end of one end of the fiber layer emitting radial laser emits laser light toward the lumen, and the end of one end of the fiber layer emitting axial laser emits laser light toward the front of the head end of the tube body. The fiber layer emitting axial laser ablates the tissue in front of the catheter head in the axial direction, and then makes the radial laser ablate the tissue entering the lumen through negative pressure or moving the laser catheter forward, and the catheter of the present invention can improve the ablation efficiency , and can better avoid tissue damage.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a laser catheter. Background technique [0002] Current approaches to endovascular tissue ablation or tissue removal include: [0003] (1) Radiofrequency ablation, which utilizes the thermal effect of radiofrequency current to cause tissue necrosis. The temperature is controlled at 37-55°C. This temperature can cause tissue coagulation and necrosis, but cannot be liquefied and removed. [0004] (2) Microwave ablation uses high-frequency electromagnetic waves to act on tissues to rapidly generate heat and cause tissue necrosis. The temperature rises rapidly and easily damages surrounding tissues. [0005] (3) Tissue rotary cutting, using a high-speed rotary atherectomy drill to remove tissue or grind and emulsify tissue into tiny particles to achieve the purpose of ablation tissue. [0006] (4) Tissue rotational atherectomy refers to the method of grinding tissue or calcified ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B18/24
CPCA61B18/24A61B2018/00404A61B2018/00589A61B2018/2205
Inventor 庞兴学
Owner DONGZHIMEN HOSPITAL OF BEIJING UNIV OF CHINESE MEDICINE