CN114601558A - A laser ablation catheter with variable fiber helix angle - Google Patents

Abstract

The invention discloses a laser ablation catheter with a variable fiber helix angle, belonging to the technical field of medical devices. The laser ablation catheter comprises an outer layer, an inner liner and an optical fiber; the outer layer is coaxial and parallel to the inner liner A multi-layer optical fiber is arranged between the outer layer and the inner lining layer; the optical fiber runs from the laser input end of the laser ablation catheter to the laser output end of the laser ablation catheter parallel to the The inner liner distribution is transformed into a helical distribution around the inner liner. Through the structural design of the optical fiber, the invention achieves the purpose of making the laser ablation catheter have better mechanical properties at different positions in the blood vessel, improves the flexibility of the laser ablation catheter, ensures the operability of the catheter, and reduces the physical damage to the patient. , suitable for medical scenarios such as excimer laser coronary plaque ablation surgery.

Description

A laser ablation catheter with variable fiber helix angle

technical field

The invention belongs to the technical field of medical equipment, and more particularly, relates to a laser ablation catheter with a variable optical fiber helix angle.

Background technique

ELCA surgery mainly transmits ultraviolet light pulses to the sclerotic site through a laser catheter. The mechanism of action is photochemical, photothermal and opto-mechanical effects between the laser and the tissue. The direct interaction between the laser and the tissue or the rapid expansion and collapse of the generated water vapor can cause The sclerotic plaque is ablated to achieve the purpose of eliminating the sclerotic plaque. Laser catheters are catheters that contain optical fibers designed to deliver laser light to lesions within the arteries. Very pure fused silica (synthetic quartz) must be used to make these fibers, and ordinary glass fibers can no longer operate with the necessary power Conducts UV light horizontally.

The ordinary quartz fiber optic catheter currently used in the operation is not effective in traveling in the curved blood vessel, which will cause certain damage to the patient's blood vessel, cause postoperative complications, and is inconvenient for doctors to operate.

Therefore, the market needs

SUMMARY OF THE INVENTION

In view of the above defects or improvement requirements of the prior art, the present invention provides a laser ablation catheter with a variable fiber helix angle, the purpose of which is to change the arrangement of the optical fibers from the laser input end of the optical ablation catheter to the laser output end of the laser ablation catheter structure, thereby solving the technical problem that the existing laser ablation catheter has poor traveling effect in a curved blood vessel.

In order to achieve the above object, according to one aspect of the present invention, a laser ablation catheter with a variable fiber helix angle is provided, the laser ablation catheter includes an outer layer, an inner liner and an optical fiber;

The outer cladding and the inner lining layer are coaxially arranged in parallel, and a multi-layer optical fiber is arranged between the outer cladding and the inner lining layer;

The optical fiber is transformed from a laser input end of the laser ablation catheter to a laser output end of the laser ablation catheter from being distributed parallel to the inner lining layer to a helical distribution around the inner lining layer.

Preferably, the optical fiber is provided with two layers, and the two layers of optical fibers are coaxially arranged.

Preferably, an epoxy resin adhesive layer is also provided between the outer layer and the inner lining layer, and the epoxy resin adhesive layer is used to fill the gaps between the optical fibers and make them bond, Thereby, the outer layer, the inner liner and the optical fiber form an integral structure.

Preferably, the outer layer is made of polytetrafluoroethylene material, and the outer surface thereof is coated with lubricating material.

Preferably, the inner lining layer is made of polytetrafluoroethylene material, and the inner surface of which is coated with lubricating material.

Preferably, the laser ablation catheter is further provided with a positioning ring, and the positioning ring is arranged at the end face of the laser output end of the laser ablation catheter, and is used to display the position of the laser ablation catheter in the blood vessel.

Preferably, the positioning ring is made of X-ray opaque material, and its outer layer is provided with a hydrophobic coating.

Preferably, a metal guide wire is also included, and the metal guide wire is arranged through the inner lining layer and is used for pulling the laser ablation catheter to move.

Preferably, the metal guide wire is made of a non-biotoxic and bioactive metal material.

Preferably, the diameter of the metal guide wire ranges from 0.008 inch to 0.016 inch.

In general, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

1. The laser ablation catheter with variable fiber helix angle proposed by the present invention transforms the optical fiber from the laser input end of the laser ablation catheter to the laser output end of the laser ablation catheter from a distribution parallel to the inner lining layer to a helical distribution around the inner lining layer. It can make the distal end of the laser ablation catheter have good flexibility, and it is easy to bend after entering the blood vessel, which can reach the lesion more smoothly, reducing the damage to the patient during the operation; the proximal end of the laser ablation catheter has better flexibility It is maneuverable and not easy to bend, so that the catheter can be better pushed along the trunk aorta, which is convenient for doctors to control.

2. The laser ablation catheter with variable fiber helix angle proposed by the present invention is easy to operate through the design of the optical fiber arrangement, and has good compatibility with the original device, which is convenient to improve the existing device and improve the operation efficiency of blood vessel ablation. Surgical effect and reduce postoperative risk.

Description of drawings

FIG. 1 is a schematic structural diagram of a laser ablation catheter with a variable fiber helix angle of the present invention.

In all drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-outer cladding; 2-epoxy adhesive layer; 3-optical fiber; 3.1-optical fiber helical segment; 3.2- Optical fiber parallel segment; 4-inner lining; 5-metal guide wire; 6-positioning ring.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

The invention proposes a laser ablation catheter with a variable fiber helix angle. Through the structural design of the optical fiber, the purpose of making the laser ablation catheter have better mechanical properties in different positions in the blood vessel is achieved, the flexibility of the laser ablation catheter is improved, and the The operability of the catheter reduces the physical damage to the patient, and is suitable for medical scenarios such as excimer laser coronary plaque ablation surgery.

Specifically, as shown in FIG. 1 , a laser ablation catheter with a variable fiber helix angle includes an outer layer 1 , an optical fiber 3 , an inner lining layer 4 , a metal guide wire 5 and a positioning ring 6 .

The metal guide wire 5 runs through the cavity of the inner lining layer 4, the outer lining layer 1 and the inner lining layer 4 are both cylindrical, and the two are concentric and parallel. The inner side of the inner lining layer 4 is coated with a lubricating coating, the distal end of the outer lining layer 1 is equipped with the positioning ring 6, and the optical fiber 3 is wrapped between the outer lining layer 1 and the inner lining layer 4. for transmitting laser light.

For further explanation, the metal guide wire 5 is made of food-grade stainless steel. As a preferred embodiment of the present invention, the diameter of the metal guide wire 5 is 0.008 inch to 0.014 inch.

It is further explained that the outer layer 1 and the inner lining layer 4 are made of polytetrafluoroethylene material that is non-toxic, non-sensitizing, free of carcinogenic side effects, and the surface lubricating coating is made of hydrophobic materials such as polyvinylpyrrolidone.

To further illustrate, the inner lining layer 4 provides a moving channel for the metal guide wire 5, and there is no tolerance matching relationship between the two.

To further explain, the diameter and length of the laser ablation catheter are set in different sizes. The minimum diameter is 1.4mm and the maximum is 2.6mm. The total length of the catheter ranges from 130cm to 160cm, and different models are selected according to the patient's physical condition.

To further illustrate, the optical fiber 3 is an optical fiber helical section 3.1 at a distance of 30 cm from the distal end of the laser catheter, with a pitch of 5 cm, and the remaining part is an optical fiber parallel section 3.2; the optical fiber is two layers of coaxial parallel arrangement, using Epoxy resin is used to bond the optical fiber 3 to the outer layer 1 and the inner lining layer 4 .

For further explanation, the positioning ring 6 is installed at the end face of the distal end of the laser ablation catheter, and is made of an X-ray opaque material, such as lead, etc., and the outer layer is coated with a hydrophobic coating.

Through the structural design of the catheter, the purpose of improving the mechanical properties of the laser ablation catheter at different positions in the blood vessel is achieved, the flexibility of the laser catheter is improved, the operability of the catheter is ensured, and the physical damage to the patient is reduced. It is suitable for excimer Medical scenarios such as laser coronary ablation surgery.

In the embodiment of the present invention, the laser ablation catheter is a working part that enters the human aorta, and the external part is connected with a metal guide wire access port, a catheter extension part and a coupler. The coupler is inserted into the excimer laser, and the laser generated by the laser is Transmission via the optical fiber follows the catheter to the lesion site. In order to facilitate the operation of the doctor, parts such as a directional handle and a handle can also be installed at the proximal end of the working part of the catheter. The above attached parts are all existing products and will not be repeated here.

When performing excimer laser coronary plaque ablation, the metal guide wire is first introduced into the aorta through the puncture sheath, and then the laser ablation catheter is introduced to move with the metal guide wire. After the laser ablation catheter reaches the coronary artery occlusion lesion, the laser starts to work, and the generated pulsed laser ablates the plaque to achieve the purpose of treatment.

Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, etc., All should be included within the protection scope of the present invention.

Claims (10)

1. The laser ablation catheter with the variable optical fiber spiral angle is characterized by comprising an outer cladding layer (1), an inner lining layer (4) and an optical fiber (3);

the outer cladding layer (1) and the inner lining layer (4) are coaxially arranged in parallel, and a plurality of layers of optical fibers (3) are arranged between the outer cladding layer (1) and the inner lining layer (4);

the optical fiber (3) is from the laser input end of the laser ablation catheter to the laser output end of the laser ablation catheter and is distributed and changed from being parallel to the inner lining layer (4) to being spirally distributed around the inner lining layer (4).

2. A variable fiber helix angle laser ablation catheter as claimed in claim 1, wherein the optical fiber (3) has two layers, and the two layers of optical fiber (3) are coaxially arranged.

3. The laser ablation catheter with the variable optical fiber helix angle as claimed in claim 2, wherein an epoxy resin bonding layer (2) is further disposed between the outer cladding layer (1) and the inner lining layer (4), and the epoxy resin bonding layer (2) is used for filling and bonding the gaps between the optical fibers (3), so that the outer cladding layer (1), the inner lining layer (4) and the optical fibers (3) form an integral structure.

4. A microfiber spiral angle laser ablation catheter according to claim 1, wherein the outer covering layer (1) is made of teflon material, and its outer surface is coated with lubricant material.

5. A variable fiber helix angle laser ablation catheter as claimed in claim 1, wherein the inner liner (4) is made of teflon material, and the inner surface thereof is coated with a lubricating material.

6. The variable optical fiber spiral angle laser ablation catheter as claimed in claim 1, wherein the laser ablation catheter is further provided with a positioning ring (6), and the positioning ring (6) is arranged at the laser output end face of the laser ablation catheter and is used for displaying the position of the laser ablation catheter in a blood vessel.

7. A variable fiber helix angle laser ablation catheter according to claim 6, characterized in that the positioning ring (6) is made of X-ray opaque material and has a hydrophobic coating on its outer layer.

8. A variable optical fiber helix angle laser ablation catheter according to claim 1, characterized by further comprising a metal guide wire (5), wherein the metal guide wire (5) is arranged through the inner liner layer (4) for drawing the laser ablation catheter to move.

9. A variable fiber helix angle laser ablation catheter as claimed in claim 8, wherein the metal guide wire (5) is made of a non-biotoxic and bioactive metal material.

10. The laser ablation catheter with the variable optical fiber helix angle is characterized in that the diameter of the metal guide wire (5) is 0.008inch to 0.016 inch.

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