CN110269631A - A kind of laser burn device - Google Patents

Abstract

The invention discloses a kind of laser burn devices, it is characterised in that including laser emitting module 1, seals dirty mirror assembly 2 and is cauterized object positioning mechanism 3, the laser that laser emitting module 1 is emitted is radiated at by the dirty mirror assembly 2 of envelope and is cauterized on object；It seals dirty mirror assembly 2 to be located in the optical path of the device, 4mm or more at the waist of the centre distance device, light passing pore radius is less than 10mm；Object positioning mechanism 3 is cauterized for placing the object being cauterized, and guarantees that the place of burning for the object being cauterized is located at the waist of the device within the scope of positive and negative each 2mm.Due to sealing the effect of dirty mirror and enclosed construction, the floating material after burning can not be attached on the component in whole device optical path, to will not influence the quality of laser beam.

Description

A laser burning device

technical field

The invention relates to a laser device, in particular to a laser ablation device.

Background technique

Laser liquid sample collection equipment is a medical device that uses a laser emitter to emit a laser beam in a very short time, instantly generates high temperature on the skin tissue, burns and vaporizes a micropore, so as to achieve the purpose of collecting liquid samples.

Existing portable laser liquid sample collection equipment often requires consumables such as laser protective caps to avoid carrying pollution and lens dirt, but this increases the cost of single liquid sample collection, and laser protective caps need to be installed when collecting liquid samples. After the laser ablation is completed, the liquid sample may be contaminated on the laser protective cap, so it needs to be treated as medical waste, which is not convenient enough to use.

Contents of the invention

In order to solve at least one of the above technical problems, the purpose of the embodiments of the present invention is to provide a laser ablation device,

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

A laser cauterization device,

It is characterized in that it includes a laser emitting module, a pollution sealing mirror assembly and a burnt object positioning mechanism,

The laser emitted by the laser emitting module is irradiated on the burned object through the pollution sealing mirror assembly;

The pollution sealing mirror assembly is located on the optical path of the device, its center is more than 4mm away from the light waist of the device, and the radius of its light hole is less than 10mm;

The cauterized object positioning mechanism is used to place the cauterized object, and ensure that the cauterized part of the cauterized object is located within the range of plus or minus 2mm from the light waist of the device.

Due to the function of the sealing mirror and the sealing structure, the floating objects after burning cannot be attached to the components on the optical path of the entire device, so as not to affect the quality of the laser beam.

Description of drawings

Fig. 1 is a schematic structural diagram of a laser ablation device provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of a laser optical device provided by an embodiment of the present invention;

Fig. 3 is a front view and a side view of the closed optical path adjustment mechanism provided by the embodiment of the present invention;

4 is a perspective view and a cross-sectional view of a semi-open cavity structure provided by an embodiment of the present invention;

Fig. 5 is a perspective view of an optical path adjustment mechanism provided by an embodiment of the present invention;

6 is a perspective view of an open state of an optical path adjustment mechanism provided by an embodiment of the present invention;

Fig. 7 is a perspective view of the closed state of the optical path adjustment mechanism provided by the embodiment of the present invention;

Fig. 8 is a longitudinal sectional view of an optical path adjustment mechanism provided by an embodiment of the present invention;

Fig. 9 is a transverse sectional view of an optical path adjustment mechanism provided by an embodiment of the present invention;

Fig. 10 is a schematic diagram of distribution of optical path main components provided by an embodiment of the present invention.

The markings in the figure are as follows:

1-laser emission module; 2-contamination sealing mirror assembly; 3-positioning mechanism of burned object;

4-upper main shell; 5-lower main shell; 6-upper fastener; 7-lower fastener;

8-light outlet of the pollution sealing mirror; 9-light hole embedded with the pollution sealing mirror assembly;

10-A semi-open cavity formed by a closed structure between the light hole embedded with the pollution sealing mirror assembly and the burnt part of the burnt object;

11 - the sealing lens on the sealing mirror assembly;

12-The thread structure on the inner wall of the semi-open cavity;

13 - The limit structure of the burning object on the positioning mechanism of the burning object;

14-right adjustment lever; 15-left adjustment lever;

16-main housing positioning structure in the main housing;

17-level adjustment and positioning structure on the displacement adjustment rod;

18-bead set screw; 19-the groove matched with wave bead set screw 18;

20 - beam reducer assembly.

Detailed ways

Laser liquid sample collection equipment uses a laser transmitter to emit a laser beam with a wavelength of 2.94 μm in a very short time, which instantly generates high temperature on the skin tissue, burns and vaporizes a micropore, so as to achieve the purpose of collecting liquid samples medical instruments.

However, the existing portable laser liquid sample collection equipment must use a laser protective cap or because the burnt matter generated during liquid sample collection will pollute and damage various devices on the laser optical path, including lenses, resonators, etc., which will eventually lead to laser light emitting devices Ineffective, and the laser protective cap can play a part of the function of isolating pollutants.

Although the laser protective cap in the existing portable laser liquid sample collection equipment has the function of anti-pollution, it increases the cost of single liquid sample collection; and the laser protective cap needs to be installed when collecting the liquid sample. After the laser ablation is completed, the liquid sample may It is contaminated on the laser protective cap, so it needs to be treated as medical waste, and it is not convenient enough to use.

The basic concept of the present invention is to use the closed structure to prevent floating pollutants from polluting various devices on the laser optical path, and use other methods to reduce the number of floating pollutants attached to the pollution sealing mirror, so as to achieve the purpose of canceling the laser protective cap. At the same time, ensure that various devices on the laser optical path are not polluted.

The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention .

As shown in Figure 1, the present invention is a laser ablation device,

It is characterized in that it includes a laser emitting module 1, a pollution sealing mirror assembly 2 and a burnt object positioning mechanism 3,

As shown in Figure 2, the laser emitted by the laser emitting module 1 is irradiated on the object to be burned through the pollution sealing mirror assembly 2;

The pollution sealing mirror assembly 2 is located on the optical path of the device, its center is more than 4mm away from the light waist of the device, and the radius of its light hole is less than 10mm;

This design is adopted because, in the absence of wind, as long as the distance between the burnt part and the optical device on the optical path exceeds a certain length, the burnt part will not adhere to the surface of the dirty mirror, and will not affect the use of the entire laser device. .

Moreover, more than 99% of the skin is carbohydrates, and there is basically no residue after burning. The gasified floating matter still has a certain probability of being gasified into finer particles during the laser burning process. The probability is gasified again, thus floating to other places, no longer affecting the use of the entire laser device.

Through our large number of burning experiments on pig skin, we confirmed that the gasified burning matter floats and adheres to a small range.

The specific experimental design is as follows.

Here we divide the energy level into 5 levels, and conduct 3,000 pig skin burning experiments in each level, and conduct experiments in 5 identical devices, and conduct a total of 5*5*3000=75,000 burning experiments.

In the case of no wind and the most serious pollution, the average laser energy change of the burnt area only changed from 180mJ to 178mJ, and the light intensity dropped by only 1.11%, which basically did not affect the burn.

Therefore, we believe that when the distance from the center of the light hole of the pollution sealing mirror to the light waist of the device is more than 4mm, the floating objects after burning will basically not affect the laser burning.

Therefore, when the pollution-sealing mirror assembly 2 is far enough away from the burned place of the object to be burned, and the radius of the light hole of the pollution-sealing mirror assembly 2 is small enough, the gasified burned objects will basically not pollute and damage various devices on the laser optical path. , including lenses, resonant cavities, etc., thereby ensuring the reliability of the laser ablation device.

The radius of the light passage hole of the pollution sealing mirror assembly 2 is less than 10 mm. This is because the vicinity of the light passage hole of the pollution sealing mirror assembly 2 is a closed structure. If there are floating objects falling on the closed structure, it will not affect the use of the optical device; The radius of the hole should be as small as possible, so that the probability of floating objects falling on the light hole is relatively small. Even if it falls on the light hole, because of the limited area, the impact is relatively small.

The object to be burned positioning mechanism 3 is used to place the object to be burned, and ensure that the burnt part of the object to be burned is within the range of plus or minus 2mm at the light waist of the device.

The positioning mechanism 3 of the object to be burned places the object to be burned on the optical path within a certain focal depth range, so that the object to be burned can be burned and gasified effectively, and the object to be burned is within the focal depth range of the optical path of the device. The placement is flexible and free, and it has a high success rate of liquid sample collection within the range of 1.5 times the depth of focus.

Further, as a specific embodiment of the laser ablation device provided by the present invention, the focal power of the lens surface of the dirty mirror assembly 2 of the laser ablation device is less than 0.1, and it is coated with a laser anti-reflection coating layer, and its anti-reflection coating layer The anti-reflection band is 2940+/-100nm.

The focal power of the lens surface of the dirt sealing mirror assembly 2 is less than 0.1, which means that the lens is a plane. This will not affect the original design of the optical path of the device, and mainly plays a role in reducing the impact of pollutants polluting the optical device.

The laser emission module of the laser liquid sample collection equipment generally emits a laser with a wavelength of 2.94 μm, so the anti-reflection band of the anti-reflection coating is 2940+/-100nm, and the laser anti-reflection coating reduces the loss of laser energy. , so that the laser can be used to the maximum and can burn and vaporize micropores, so as to achieve the purpose of burning out holes and facilitating liquid sample collection.

Moreover, the laser anti-reflection coating layer is also an antifouling layer, and the coating process is vacuum deposition. The anti-pollution coating makes it more difficult for floating pollutants to contaminate the lens surface of the pollution-sealed mirror assembly 2, thus not affecting the use of the laser device. Vacuum deposition coating process, compared with traditional coating technology, can not only obtain high-density, high-binding coating, but also can be processed at low temperature, so as not to affect the substrate performance of parts.

Further, as shown in Figure 3, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device,

It also includes the main housing, the main housing is divided into upper main housing 4 and lower main housing 5, the upper main housing 4 and the lower main housing 5 are tightly fastened, the laser emission module 1 and the pollution sealing mirror assembly 2 are fixed inside the main housing ,

It is characterized in that the main casing also includes an upper fastener 6 and a lower fastener 7, which are respectively locked with the upper main casing 4 and the lower main casing 5, and the upper fastener 6 and the lower fastener 7 are left at the front end to be positioned with the object to be burned. The opening of the mechanism 3 fits with the light outlet 8 of the pollution sealing mirror, and the opening that fits with the burnt object positioning mechanism 3 is the opening of the section size of the burnt object positioning mechanism 3, and the center of the opening is the light outlet 8 of the pollution sealing mirror , embedded with the light hole 9 of the contamination sealing mirror assembly 2 .

In this way, the fastener and the main housing form a two-layer closed structure, which further ensures the sealing of the overall structure to the optical device, so that floating pollutants cannot contaminate the internal optical path.

Further, as shown in Figure 4, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device,

It is characterized in that,

A semi-open cavity body 10 is formed by a closed structure between the light hole 9 of the pollution sealing mirror assembly 2 and the burning place of the object to be burned. 11 for sealing, the inner wall of the semi-open cavity body 10 is a threaded structure 12 or a ring-shaped toothed structure.

Such a design idea is similar to a labyrinth seal. Labyrinth seals are generally arranged around the rotating shaft with a number of annular sealing teeth arranged in sequence. A series of interception gaps and expansion cavities are formed between the teeth. the goal of.

The inner wall of the semi-open cavity body 10 is a threaded structure 12 or an annular toothed structure. It is equivalent to a half of a labyrinth seal structure, that is, there are no rotating parts here, and there are many tortuous chambers on the fixed parts, and the friction effect, stream contraction effect and ventilation effect similar to the labyrinth seal structure will prevent floating The pollutants enter the semi-open cavity body 10, so as to reduce the floating pollutants.

Further, as shown in Figure 5, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device is characterized in that,

The cauterized object positioning mechanism 3 can be pulled out or pushed back from the main casing.

The cauterized object positioning mechanism 3 can be pulled out or pushed back from the main housing, and the distance between the cauterized object positioning mechanism 3 and the contamination sealing mirror assembly 2 can be farther during cautery, so that it is more difficult for pollutants to fall on the On the optical device, reduce the influence of pollutants.

Further, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device,

It is characterized in that,

The target positioning mechanism 3 includes more than one displacement adjustment rod, and the light emitting direction of the device is parallel to the displacement direction of the displacement adjustment rod;

The displacement adjustment rod includes a cauterized object limiting structure 13 that limits the position of the cauterized object. When the displacement adjustment rod is pulled out from the main housing, the center point of the cauterized object limiting structure 13 on the displacement adjustment rod is aligned with the laser emission. The distance between the light outlets of the module 1 is greater than 10 mm.

And the displacement adjustment rod (the figure contains two adjustment rods, including the right adjustment rod 14 and the left adjustment rod 15), and the light output direction of the device is parallel to the displacement direction of the displacement adjustment rod;

In this way, it can ensure that the displacement direction of the laser beam and the displacement adjustment lever (including the right adjustment lever 14 and the left adjustment lever 15 in the figure) does not tilt, and is focused on the design position. Nearby) the horizontal and vertical dimensions are limited to improve the accuracy of the liquid sample collection position, thereby improving the success rate of liquid sample collection.

The distance between the center point of the cauterized object limiting structure 13 on the displacement adjustment rod and the light outlet of the laser emitting module 1 is greater than 10mm, which can make the distance between the cauterized object positioning mechanism 3 and the pollution sealing mirror assembly 2 farther, so that pollutants It is harder to land on optics, reducing the impact of contaminants.

When the device is sampling, the displacement adjustment rod is stretched to the target position, as shown in Figure 6.

After the sampling is completed, the displacement adjustment rod can be retracted into the housing, which ensures the design integrity of the device, as shown in Figure 7.

Further, as shown in Figure 5, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device,

It is characterized in that,

The interior of the main housing includes a main housing positioning structure 16;

The displacement adjustment rod includes more than one level adjustment positioning structure 17, and the main housing positioning structure 16 cooperates with one or more level adjustment positioning structures 17 on the displacement adjustment rod.

Since the skin thickness of different groups of people is also different, under the design concept of anti-fouling function of the anti-fouling mirror instead of the laser protective cap, the positioning structure 16 of the main housing cooperates with one or more of the positioning structures 17 on the displacement adjustment rod , which can make the distance between the center point of the limit structure 13 of the object to be burned on the displacement adjustment rod and the light outlet of the laser emission module 1 meet the design requirements of the optical path length of the long focal depth, and has a multi-level adjustment function, which can be adjusted in different gears , to meet the liquid sample collection needs of people with different skin thickness.

The displacement of the light output direction of the displacement adjustment lever is not less than 0.5mm, so that the number of stages that can be adjusted for the length of the optical path is more reasonable and convenient for various users;

And the pretightening force at the positioning point of each stage is greater than 0.5 N, so that each stage can be firmly fixed, which facilitates the positioning when collecting liquid samples.

Further, please refer to Fig. 8 and Fig. 9, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device,

It is characterized in that the positioning structure of the main housing is a wave bead set screw 18 , and the step-adjusting positioning structure is a groove 19 matched with the wave bead set screw 18 .

Here, the groove 19 has a radius of 2.5 mm, a depth of 2 mm, and a length of 14 mm. The end face of the matching wave ball set screw 18 is a marble with a radius of 2.5 mm. The ball is 2 mm higher than the screw step surface. Hold the marbles. In this way, the displacement adjustment rod needs to overcome the elastic force of the wave bead set screw 18 during the displacement process, and at the same time, it can stop quickly and accurately when it moves to the groove 19, so as to achieve the purpose of level adjustment and positioning.

In addition, the design of adopting the wave bead set screw 18 and the groove 19 matched with the bead set screw 18 has the advantage of lower cost and easier implementation compared with other designs.

Furthermore, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device is characterized in that,

The limiting structure 13 of the object to be burned is a groove 19 with a depth of 5 to 9 mm, a radius of 9 to 13 mm, and a width of 20 to 25 mm.

The optimal limiting mechanism for the burnt object here is a 7mm deep groove on the displacement adjustment rod, with an approximate radius of 11mm and a width of 22.5mm, while the diameter of human fingers is generally 13mm to 22mm, which is convenient for placing human fingers on this The groove makes it difficult for fingers to move and facilitates liquid sample collection.

Further, as shown in Figure 10, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device,

It is characterized in that,

On the optical path between the laser emitting module 1 and the pollution sealing mirror assembly 2, a beam reducing mirror assembly 20 is also included,

The beam reducer assembly 20 has positive refractive power, and its clear aperture is less than 10mm, so that the radius of the light spot at the light waist of the device is less than 0.7mm.

The beam reducer assembly 20 is located on the optical path of the device, and ensures that the focal depth of the optical path of the device is greater than 4mm.

The main design function of the beam reducer assembly 20 is to elongate the focal depth of the device, so as to ensure that the focal depth range of the optical path of the device is larger than that of the existing portable laser liquid sample collection equipment.

This is because when the portable laser liquid sample collection equipment no longer uses the laser protective cap, if there is no other device to ensure the focusing function, if there is a slight deviation, the laser spot will expand sharply, the energy will no longer focus on a small range, and the energy will be dispersed. It is easy to cause the vaporized skin to be burned, resulting in the inability of the liquid sample to flow out and the collection of the liquid sample to be unable to be completed.

In order to solve the problem that the distance range of the cauterized object is too small when the portable laser is used for effective liquid sample collection, we use the long focus depth design of the laser cauterization device to replace the positioning function of the existing laser protective cap through careful design, and make the cauterized object The cauterization point can be adjusted relatively freely within the focus depth range of the optical path of the device, thereby having a better user experience.

Since the skin is composed of epidermis and dermis, the total thickness is between 0.5mm and 4mm, with an average of more than 1mm. The epidermis on the finger is a hairless thick epidermis, which is composed of stratum corneum, transparent layer, granular layer and germinal layer, and the melanin produced by the germinal layer determines the color of the skin. The entire epidermis is avascular and translucent gray, with a thickness of 0.066mm-0.178mm. The dermis is composed of the papillary layer and the reticular layer, with a large number of microvessels, lymphatic vessels, and nerve endings distributed. The dermis does not contain melanin and is white and opaque, with a thickness of 0.4mm-4mm.

Therefore, when the incision made by the laser penetrates deep into the dermal tissue, the microvessels in the dermis can be cut to allow the liquid sample to flow out.

Calculated according to the maximum thickness of 4mm, in order to realize liquid sample collection, it is required that the laser spot should be as small as possible within the thickness of 4mm, and the range should be within the focal depth range.

Here, focal depth is defined as the distance between two axial coordinates when the axial intensity drops to 1/2 of the central intensity,

That is, DOF=2|ZR|, ZR=M2*(f*f)*a/(2*pi*(r*r)),

Among them, ZR is the Rayleigh length, M2 is the beam quality factor, f is the focal length of the lens group, a is the laser wavelength, r is the spot radius of the incident surface of the lens, and the size of M2 is 7.69, the size of a is 2.94μm, and the size of r is 0.43mm.

It can be seen from the calculation of the above formula that f≥14.336mm, so the focal length range when designing the lens group is f≥14.336mm to ensure the depth of focus for liquid sample collection.

Through such a scheme design, the focal depth of the portable laser liquid sample collection device has increased from the traditional less than 0.5mm to more than 4mm, and the focal depth has been increased by more than 8 times, thus greatly widening the range of liquid sample collection and effectively reducing the liquid sample. The probability of not being able to flow out greatly improves the product fault tolerance rate.

In addition to the above-mentioned similar design of the telephoto focusing lens, the design method of the long focal depth also includes but is not limited to the following methods:

1. Conical mirror;

2. Binary diffraction element;

3. Multiple reflections elongate the optical path to elongate the depth of focus.

In addition, according to our design, the maximum energy of the light exit of the laser ablation device is greater than 180mJ, and the maximum radius of the light exit of the laser ablation device is less than 2mm, which ensures that the laser energy focused within the focal depth range is sufficient to ablate through the dermis and complete liquid samples. collection function.

Further, as a specific embodiment of the laser ablation device provided by the present invention, the laser ablation device,

It is characterized in that,

The lens surface of the beam reducer assembly 20 close to the light waist of the device is a plane, and the lens surface far away from the light waist of the device is a convex surface;

Within the range of the effective clear aperture of the beam reducer assembly 20, the outgoing laser beam is reduced to reduce the spot radius at the light waist of the laser. In addition, the first surface of the beam reducer assembly 20 is convex and the second surface is a plane, which is beneficial to the laser beam. The gentler beam shrinkage further reduces the spot radius at the light waist of the laser.

The beam reducer assembly 20 is coated with a combination of anti-reflection in the laser band and anti-reflection in the white light band at both ends of the beam reducer assembly 20 through a vacuum deposition coating process. The anti-reflection band of the anti-reflection coating is 2940+/-100nm.

In this way, the loss of laser energy is reduced by coating the combined film layer, so that the laser can be used to the maximum extent and can burn and vaporize micropores, so as to achieve the purpose of burning out holes and facilitating liquid sample collection. The vacuum deposition coating process, compared with the traditional coating technology, can not only obtain a high-density, high-binding coating, but also can be processed at a low temperature, so as not to affect the substrate performance of the part.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related All technical fields are equally included in the scope of patent protection of the present invention.

Claims (10)

1. A laser ablation device, It is characterized in that it includes a laser emitting module (1), a pollution sealing mirror assembly (2) and a burnt object positioning mechanism (3), The laser emitted by the laser emitting module (1) is irradiated on the object to be burned through the pollution sealing mirror assembly (2); the pollution sealing mirror assembly (2) is located on the optical path of the device, and its center is more than 4mm away from the light waist of the device , the radius of the light hole is less than 10mm; The cauterized object positioning mechanism (3) is used to place the cauterized object, and ensure that the cauterized place of the cauterized object is located within the range of plus or minus 2 mm from the light waist of the device. 2. A laser ablation device as claimed in claim 1, characterized in that, The focal power of the lens surface of the dirt sealing mirror assembly (2) is less than 0.1, and is coated with a laser anti-reflection film layer. 3. A laser ablation device as claimed in claim 1, It also includes the main shell, the main shell is divided into the upper main shell (4) and the lower main shell (5), the upper main shell (4) and the lower main shell (5) are fastened together, the laser emission module (1), the pollution seal The mirror assemblies (2) are all fixed inside the main housing, It is characterized in that the main casing also includes an upper fastener (6) and a lower fastener (7), which are respectively locked with the upper main casing (4) and the lower main casing (5), and the upper fastener (6) and the lower fastener (7) At the front end, there is an opening that fits with the burnt object positioning mechanism (3) and the light outlet of the pollution sealing mirror (8), and the opening that fits with the burnt object positioning mechanism (3) is the burnt object positioning mechanism ( 3) An opening with a cross-sectional size, and the center of the opening is the light outlet (8) of the pollution sealing mirror, and the light hole (9) of the pollution sealing mirror assembly (2) is embedded. 4. A laser ablation device as claimed in claim 1, It is characterized in that a semi-open cavity (10) is formed by a closed structure between the light hole (9) of the pollution sealing mirror assembly (2) and the burning place of the object to be burned, and one end of the light hole is made of The pollution sealing lens (11) on the pollution sealing mirror assembly (2) is sealed, and the inner wall of the semi-open cavity (10) is a thread structure (12) or a ring tooth structure. 5. A laser ablation device as claimed in claim 3, It is characterized in that the cauterized object positioning mechanism (3) can be pulled out or pushed back from the main casing. 6. A laser ablation device as claimed in claim 5, It is characterized in that the said target positioning mechanism (3) includes more than one displacement adjustment rod, and the light emitting direction of the device is parallel to the displacement direction of the displacement adjustment rod; The displacement adjustment rod includes a cauterized object limiting structure (13) that limits the position of the cauterized object. When the displacement adjustment rod is pulled out from the main housing, the center of the cauterized object limiting structure (13) The distance between the point and the light outlet of the laser emitting module (1) is greater than 10mm. 7. A laser ablation device as claimed in claim 6, It is characterized in that, the inside of the main housing includes a main housing positioning structure (16); the displacement adjustment rod includes more than one level-adjusting positioning structure (17), and the main housing positioning structure (16) and the displacement adjustment rod Cooperate with one of the above adjustment level positioning structures (17) on it. 8. A laser ablation device as claimed in claim 1, It is characterized in that the limiting structure (13) of the object to be burned is a groove (19) with a depth of 5 to 9 mm, a radius of 9 to 13 mm, and a width of 20 to 25 mm. 9. A laser ablation device as claimed in claim 1, It is characterized in that the optical path between the laser emitting module (1) and the pollution sealing mirror assembly (2) also includes a beam reducer assembly (20), the beam reducer assembly (20) has positive refractive power, and its clear aperture is The radius of the light spot at the light waist of the device is less than 0.7mm. 10. A laser ablation device as claimed in claim 9, It is characterized in that the lens surface of the beam reducer assembly (20) close to the light waist of the device is a plane, and the lens surface far away from the light waist of the device is a convex surface; the beam reducer assembly (20) is coated by vacuum deposition process, both ends of the beam reducer assembly (20) are coated with a combination film layer of anti-reflection in the laser band and anti-reflection in the white light band.