Film cooling type skin flap low-damage laser cutting device with inner spraying and outer liquid absorbing functions

Abstract

The utility model provides an inner-spraying and outer-liquid-absorbing film cooling type skin flap low-damage laser cutting device which comprises a three-axis movement mechanism, an inner-spraying and outer-liquid-absorbing film cooling cutting head, a laser device, a negative-pressure skin fixator, a liquid supply device and a liquid pumping device. The inner-spraying and outer-liquid-absorbing film cooling cutting head comprises an upper shell, a focusing device and a lower shell. A laser light path of the laser emitting laser downwards is arranged in the inner cavity of the upper shell; the focusing devices are arranged in inner cavities of the lower part of the upper shell and the upper part of the lower shell, the upper parts of the inner cavities are communicated with a laser light path, and the lower parts of the inner cavities are communicated with positive pressure cavities positioned in the middle and the lower part of the lower shell; the focusing device is coaxial with a laser light path emitted by the laser. The utility model has the beneficial effects that the laser wavelength absorption efficiency of the skin tissue is high, the cutting speed is high, the skin making time is short, the cutting precision is high, and the postoperative skin grafting survival rate is high; the skin making precision is high; the economic benefit is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to skin grafting instrument structure design and application technical field, especially in, a kind of internal spray liquid membrane cooling type flap low-damage laser cutting device of suction. BACKGROUND

[0002] With the continuous progress of science and technology and the continuous improvement of people's life quality, people's expectation of skin grafting surgery is continuously improved. Skin grafting surgery is a kind of surgery for repairing wound surface by taking normal skin tissue of body, which is often applied to patients with large-area skin burn. When the wound surface is too large, the doctor needs to cut the removed skin patch into multiple small skin patches with a skin knife, and then expand the micro skin patch by multiple times for subsequent skin grafting.

[0003] Therefore, people urgently hope to obtain a skin flap low-damage cutting device for skin grafting surgery which is durable, accurate and standard. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a kind of internal spray liquid membrane cooling type flap low-damage laser cutting device. To overcome prior art defects, the internal spray liquid membrane cooling type flap low-damage laser cutting device described in the utility model specifically adopts internal spray liquid membrane to cover laser cutting area, which not only can realize efficient and automatic flap laser cutting, but also can greatly reduce the thermal influence on normal skin tissue around incisal margin, and improve the success rate of skin grafting.

[0005] The utility model relates to internal spray liquid membrane cooling type flap low-damage laser cutting device, and its technical key is: the internal spray liquid membrane cooling type flap low-damage laser cutting device includes three-axis motion mechanism, internal spray liquid membrane cooling cutting head, laser 1, negative pressure skin fixer 7, liquid supply device 9 and liquid extraction device 8;Wherein: the internal spray liquid membrane cooling cutting head is fixed on three-axis motion mechanism, laser 1 is fixed on internal spray liquid membrane cooling cutting head, and negative pressure skin fixer 7 is located at the bottom of the internal spray liquid membrane cooling type flap low-damage laser cutting device;

[0006] The internal spray liquid membrane cooling cutting head includes upper shell 12, focusing device 3 and lower shell 15;Upper shell 12 and lower shell 15 are arranged in sequence and adjacent from top to bottom;And the cavities in its interior are sequentially communicated;Laser 1 is arranged on the upper part or above upper shell 12;The laser light path 2 of laser 1 emitting laser downwards is arranged in the cavity in upper shell 12;Focusing device 3 is arranged in the inner cavity of the lower part of upper shell 12 and the upper part of lower shell 15, which is communicated with laser light path 2 above, and is communicated with positive pressure chamber 4 in the inner cavity of the middle and lower part of lower shell 15 below;

[0007] The focusing device 3 is coaxial with the laser light path 2 emitted by the laser 1; the upper shell 12 is provided with two concentric annular grooves near the lower end surface: an outer pressure-equalizing ring 14 and an inner pressure-equalizing ring 13; the outer pressure-equalizing ring 14 is connected to the liquid extraction device 8 via the liquid extraction water pipe 10, and the inner pressure-equalizing ring 13 is connected to the liquid supply device 9 via the liquid supply water pipe 11; the liquid supply device 9 delivers pressurized water to the inner pressure-equalizing ring 13; the lower shell 15 is provided with an annular groove structure near the lower end surface: a negative pressure liquid suction ring 18; the negative pressure liquid suction ring 18 is connected to the outer pressure-equalizing ring 14 via a liquid extraction tube 17;

[0008] The inner pressure-equalizing ring 13 is also connected to the middle of the positive pressure chamber 4 in the vertical direction through the liquid supply tube 16, and outputs the liquid flow to the skin surface in the form of a uniform liquid film 5, and the thickness of the liquid film is 0.5-2mm; the debris and liquid generated by leather making are collected to the liquid extraction device 8 through the negative pressure suction ring 18 and the liquid extraction tube 17, and then in turn through the outer pressure-equalizing ring 14 and the liquid extraction pipe 10 with the help of negative pressure.

[0009] The internal spraying and external suction liquid film cooling skin flap low damage laser cutting device described in the present invention preferably requires protection of the following technical content: the laser 1 is a laser with a wavelength of one of the following: 9.3um, 10.6um, 355nm, 532nm, 1064nm, 2940nm.

[0010] The positive pressure cavity has a diameter of 2-10 mm and a height of 0.2-5 mm.

[0011] The liquid used in the operation of the liquid supply device 9 is one of the following or a combination thereof: purified water, physiological saline; and the liquid supply pressure is 0.1-3 MPa.

[0012] The negative pressure skin fixator 7 is installed at the bottom of the cutting device and is used to continuously apply negative pressure to the skin to provide surface tension; the negative pressure of the negative pressure skin fixator 7 is set to: -2 to -90 kPa.

[0013] The steps and contents of the low-damage laser cutting method for skin flaps using the aforementioned low-damage laser cutting device for skin flaps cooled by internal spraying and external aspiration liquid film cooling meet the following requirements in sequence:

[0014] Step 1: After the surgeon completes the pre-surgery steps for skin grafting, he or she places the intact skin graft on the sterile negative pressure skin fixator 7. The negative pressure fixator 7 is turned on to continuously suction the skin to maintain surface tension. The three-axis motion mechanism is adjusted so that the bottom of the lower housing 15 is 0.5-2.0 mm above the skin graft surface.

[0015] Step 2: Open the liquid supply device 9, set the pressure of the normal saline solution, and step on the liquid supply pedal of the liquid supply device to continuously supply the liquid;

[0016] Step 3, according to the size requirement of the prepared skin flap, the output power of the laser 1 and the skin processing motion track are set; the output power setting range of the laser 1 is 0-300W; the track setting range is X axis-99, 99, Y axis-99, 99; the output power is 20-50W;

[0017] Step 4, the laser 1 light output control pedal is stepped on, and the cutting device automatically realizes the cutting operation of the skin flap tissue;

[0018] Step 5, after the cutting operation is completed, the laser 1 light output control pedal and the control pedal of the liquid supply device 9 are released, the skin cutting condition is checked, and the skin preparation is completed.

[0019] The utility model relates to a kind of liquid membrane cooling type skin flap low-damage laser cutting devices of inner spray outer suction, including three-axis motion mechanism, inner spray outer suction liquid membrane cooling cutting head, laser 1, negative pressure skin fixer 7, pumping device 8, liquid supply device 9 etc.The inner spray outer suction liquid membrane cooling cutting head is fixed on three-axis motion mechanism, laser 1 is fixed on inner spray outer suction liquid membrane cooling cutting head, and negative pressure skin fixer 7 is located at the bottom of cutting device.The inner spray outer suction liquid membrane cooling cutting head includes upper shell 12, focusing device 3 and lower shell 15;Focusing device 3 is coaxial on laser channel and is installed in lower shell 15 interior;Upper shell 12 is distributed with inner equalizing ring 13, outer equalizing ring 14 and connecting pipeline of pumping device 8 and pumping device 8;Liquid supply device 9 is sent to inner equalizing ring 13 with pressure flow by liquid supply pipe 11, and inner equalizing ring 13 is connected by liquid supply small pipe 11 and positive pressure chamber 4, and liquid flow is output to skin surface in the form of uniform liquid membrane 5, and the generated debris and liquid of skin preparation are collected to pumping device 8 by negative pressure suction ring 18 and pumping small pipe 17 under negative pressure.

[0020] A kind of liquid membrane cooling type skin flap low-damage laser cutting method of inner spray outer suction: utilize skin knife to take down large piece complete skin flap on healthy skin, and the skin flap is fixed on negative pressure skin fixer 7;Setting guide rail motion and laser 1 parameter, open pumping device 9 and pumping device 8, and laser 1 generates laser cutting skin flap.Compared with prior art, the utility model is always wrapped in processing area with liquid membrane 5 in cutting process, can take away processing heat in time, reduce the damage to skin tissue;On the other hand, the debris generated in the process of skin flap cutting is also taken away in time by pumping device 8, can reduce the pollution to skin flap, and skin flap survival rate is high after operation, with expected greater economic value and social value.

[0021] The utility model has the advantages that:

[0022] Compared with prior art, the utility model has the advantages that:

[0023] 1. This utility model uses a high-energy laser beam to cut the skin graft. The skin tissue has a high absorption efficiency of the laser wavelength used, cutting is rapid, and the skin preparation time is short. The three-axis motion mechanism is used to achieve laser cutting, with high cutting accuracy. In addition, the laser radiation can stimulate the skin tissue bio-stimulation, which can promote the skin regeneration process and facilitate recovery after transplantation.

[0024] 2. The utility model adopts an internal suction and external spray liquid film cooling system. The heat generated by high-energy laser cutting is promptly cooled by the liquid film 5, reducing the thermal impact on the skin tissue; the liquid extraction device 8 promptly cleans the debris and wastewater generated during the skin making process, effectively reducing the contamination and infection of the cutting edge, and the survival rate of the skin graft after surgery is high;

[0025] 3. The utility model adopts a negative pressure skin fixator 7, which does not require external fixation devices such as clamps, maintains skin tension, allows the skin tissue to fully extend during cutting, and effectively improves the accuracy of leather making;

[0026] 4. The utility model uses high-energy laser beam to cut the skin slices, without the need for blade cutting, effectively reducing equipment loss and achieving good economic benefits;

[0027] 5. Compared with the existing technology, the liquid film 5 always wraps the processing area during the cutting process, which can take away the processing heat in time and reduce damage to the skin tissue. On the other hand, the debris generated during the skin graft cutting process is also taken away in time by the liquid extraction device 8, which can reduce the contamination of the skin graft. The survival rate of the skin graft after surgery is high, and it has expected greater economic and social value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the low-damage laser cutting device for skin flaps using internal spraying and external absorption liquid film cooling as described in Example 1;

[0029] Figure 2 It is an example diagram of the present utility model;

[0030] Figure 3 This is a flow chart of the low-damage laser cutting method for skin flaps using internal spray and external suction liquid film cooling;

[0031] Figure 4 It is the operation flow chart of the three-axis motion mechanism. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the embodiments and the accompanying drawings, but is not limited thereto.

[0033] Figure numerals: laser 1, laser optical path 2, focusing device 3, positive pressure chamber 4, liquid film 5, skin-away distance 6, negative pressure skin fixer 7, liquid extraction device 8, liquid supply device 9, liquid extraction water pipe 10, liquid supply water pipe 11, upper shell 12, inner equalizing pressure ring 13, outer equalizing pressure ring 14, lower shell 15, liquid supply tube 16, liquid extraction tube 17, negative pressure liquid suction ring 18.

[0034] Embodiment 1

[0035] The inner spray and outer liquid film cooling type skin flap low-damage laser cutting device, as shown in Figure 1 , Figure 2 , overcomes the defects of the prior art by covering the laser cutting area with an inner spray and outer liquid film, which not only realizes efficient and automated skin flap laser cutting, but also greatly reduces the thermal impact on the normal skin tissue around the incision, thereby improving the success rate of skin grafting.

[0036] The inner spray and outer liquid film cooling type skin flap low-damage laser cutting device comprises a three-axis motion mechanism, an inner spray and outer liquid film cooling cutting head, a laser 1, a negative pressure skin fixer 7, a liquid supply device 9, and a liquid extraction device 8. The inner spray and outer liquid film cooling cutting head is fixed on the three-axis motion mechanism, and the laser 1 is fixed on the inner spray and outer liquid film cooling cutting head. The negative pressure skin fixer 7 is located at the bottom of the inner spray and outer liquid film cooling type skin flap low-damage laser cutting device.

[0037] The inner spray and outer liquid film cooling cutting head comprises an upper shell 12, a focusing device 3, and a lower shell 15. The upper shell 12 and the lower shell 15 are arranged in sequence and are adjacent to each other. The cavities inside them are connected in sequence. The laser 1 is arranged on the upper part or above the upper shell 12. The laser light path 2 of the laser 1 emitting laser light downward is arranged in the cavity inside the upper shell 12. The focusing device 3 is arranged in the inner cavity of the lower part of the upper shell 12 and the upper part of the lower shell 15. The inner cavity is connected to the laser light path 2 above, and is connected to the positive pressure cavity 4 in the inner cavity of the middle and lower part of the lower shell 15 below.

[0038] The focusing device 3 is coaxial with the laser light path 2 emitted by the laser 1. Two concentric annular grooves, an outer pressure equalizing ring 14 and an inner pressure equalizing ring 13, are provided near the lower end face of the upper shell 12. The outer pressure equalizing ring 14 is connected to the liquid extraction device 8 through the liquid extraction water pipe 10, and the inner pressure equalizing ring 13 is connected to the liquid supply device 9 through the liquid supply water pipe 11. The liquid supply device 9 delivers the pressurized water flow to the inner pressure equalizing ring 13. The lower shell 15 is provided with an annular groove structure, a negative pressure liquid suction ring 18, near the lower end face. The negative pressure liquid suction ring 18 is connected to the outer pressure equalizing ring 14 through the liquid extraction small pipe 17.

[0039] The inner pressure equalizing ring 13 is also connected to the positive pressure cavity 4 through the liquid supply small pipe 16 and the vertical middle part, and outputs the liquid flow to the skin surface in the form of a uniform liquid film 5. The thickness of the liquid film is 0.5-2 mm. The debris and liquid generated during skin preparation are collected by the negative pressure liquid suction ring 18 and the liquid extraction small pipe 17, and then pass through the outer pressure equalizing ring 14 and the liquid extraction water pipe 10 by means of negative pressure to the liquid extraction device 8.

[0040] The laser 1 is a laser with a wavelength of one of the following: 9.3um, 10.6um, 355nm, 532nm, 1064nm, 2940nm.

[0041] The positive pressure cavity has a diameter of 2-10mm and a height of 0.2-5mm.

[0042] The liquid used by the liquid supply device 9 is one of the following or a combination thereof: pure water, physiological saline; the liquid supply pressure is 0.1-3MPa.

[0043] The negative pressure skin fixer 7 is installed at the bottom of the cutting device and is used to provide surface tension by continuously negative pressure suction of the skin; the negative pressure of the negative pressure skin fixer 7 is set to be -2 to -90kPa.

[0044] The low-damage laser cutting device for the liquid film cooling type skin flap of the present embodiment includes a three-axis motion mechanism, an internal spraying and external suction liquid film cooling cutting head, a laser 1, a negative pressure skin fixer 7, a liquid pumping device 8, a liquid supply device 9, etc. The internal spraying and external suction liquid film cooling cutting head is fixed on the three-axis motion mechanism, the laser 1 is fixed on the internal spraying and external suction liquid film cooling cutting head, and the negative pressure skin fixer 7 is located at the bottom of the cutting device. The internal spraying and external suction liquid film cooling cutting head includes an upper shell 12, a focusing device 3 and a lower shell 15; the focusing device 3 is coaxially installed in the laser channel inside the lower shell 15; the upper shell 12 is distributed with an internal equalizing ring 13, an external equalizing ring 14 and pipelines connected with the liquid supply device 9 and the liquid pumping device 8; the liquid supply device 9 delivers the pressurized water flow to the internal equalizing ring 13 through a liquid supply pipe 11, the internal equalizing ring 13 is connected with the positive pressure cavity 4 through a liquid supply small pipe 11, and the liquid flow is output to the skin surface in the form of uniform liquid film 5, and the generated debris and liquid during the skin preparation are collected to the liquid pumping device 8 by the negative pressure suction ring 18 and the liquid pumping small pipe 17.

[0045] The skin flap is cut by the high-energy laser beam, the skin tissue has high absorption efficiency for the used laser wavelength, the cutting is rapid, and the skin preparation time is short; the three-axis motion mechanism is used to realize the laser cutting, and the cutting precision is high. In addition, the radiation effect of the laser can stimulate the skin tissue and promote the skin regeneration process, which is beneficial to the recovery after transplantation;

[0046] The internal suction and external spraying type liquid film cooling system is used, the heat generated by the high-energy laser cutting is cooled in time by the liquid film 5, the heat effect on the skin tissue is reduced, the debris and waste water generated during the skin preparation process are cleaned in time by the liquid pumping device 8, the cutting edge pollution and infection are effectively reduced, and the survival rate of the skin graft after the operation is high;

[0047] The negative pressure skin fixer 7 is used, and no external fixing device such as a clamp is needed, the skin tension is maintained, the skin tissue is fully stretched during the cutting process, and the skin preparation precision is effectively improved;

[0048] The embodiment uses a high-energy laser beam to cut the obtained skin flap, without the need for blade cutting, effectively reducing equipment loss and achieving good economic benefits.

[0049] The steps and contents of the internal spraying and external liquid membrane cooling type skin flap low-damage laser cutting method using the internal spraying and external liquid membrane cooling type skin flap low-damage laser cutting device described in the embodiment meet the following requirements in turn:

[0050] Step 1: After the surgeon completes the preoperative steps of the skin grafting operation, the intact skin flap is placed on the sterile negative pressure skin fixator 7. The negative pressure fixator 7 is turned on to maintain the skin surface tension. The three-axis motion mechanism is adjusted to make the bottom of the lower shell 15 0.5-2.0 mm above the surface of the skin flap.

[0051] Step 2: Turn on the liquid supply device 9 and set the physiological saline supply pressure. Step on the liquid supply pedal of the liquid supply device to continuously supply liquid.

[0052] Step 3: According to the size requirements of the skin flap, set the output power of the laser 1 and the skin flap processing trajectory. The output power of the laser 1 is set to 0-300 W. The trajectory is set to X-axis -99, 99, Y-axis -99, 99. The output power is set to 20-50 W.

[0053] Step 4: Step on the laser 1 light control pedal, and the cutting device automatically realizes the cutting operation of the skin flap tissue.

[0054] Step 5: After the cutting operation is completed, release the laser 1 light control pedal and the control pedal of the liquid supply device 9. Check the skin flap cutting condition and complete the skin preparation.

[0055] The internal spraying and external liquid membrane cooling type skin flap low-damage laser cutting method using the internal spraying and external liquid membrane cooling type skin flap low-damage laser cutting device described in embodiment 1 is used: a large intact skin flap is taken from healthy skin using a skin grafting knife. The skin flap is fixed on the negative pressure skin fixator 7. The guide rail motion and laser 1 parameters are set. The liquid supply device 9 and the liquid suction device 8 are turned on. The laser 1 generates laser cutting of the skin flap.

[0056] Compared with the prior art, the processing area is always wrapped in a liquid film 5 during the cutting process, which can timely remove the processing heat and reduce the damage to the skin tissue. On the other hand, the debris generated during the skin flap cutting process is also timely removed by the liquid suction device 8, which can reduce the pollution of the skin flap, increase the survival rate of the skin flap after the operation, and has a large economic value and social value.

[0057] Embodiment 2

[0058] An internal spraying and external liquid membrane cooling type skin flap low-damage laser cutting device, as shown in Figure 1As shown, it comprises a three-axis motion mechanism, an inner spraying and outer absorbing liquid film cooling cutting head, a laser 1, a negative pressure skin fixer 7, a liquid supply device 9 and a liquid suction device 8. The inner spraying and outer absorbing liquid film cooling cutting head is fixed on the three-axis motion mechanism, the laser 1 is fixed on the inner spraying and outer absorbing liquid film cooling cutting head, and the negative pressure skin fixer 7 is located at the bottom of the cutting device. The inner spraying and outer absorbing liquid film cooling cutting head comprises an upper shell 12, a focusing device 3 and a lower shell 15; the focusing device is coaxially installed in the lower shell 15; the upper shell 12 is distributed with an outer uniform pressure ring 14, an inner uniform pressure ring 13 and pipelines connected with the liquid supply device 9 and the liquid suction device 8; the liquid supply device 9 delivers the water flow with pressure to the inner uniform pressure ring 13 through a liquid supply pipe 11, and the inner uniform pressure ring 13 is connected with the positive pressure cavity 4 through a liquid supply small pipe 16 to output the liquid flow to the skin surface in the form of uniform liquid film 5, and the debris and liquid generated in the skin processing are collected to the liquid suction device 8 through the negative pressure absorbing ring 18 and the liquid suction small pipe 17;

[0059] The wavelength of the laser 1 is one of 355 nm, 532 nm, 1064 nm, 2940 nm, 9.3 um and 10.6 um;

[0060] The liquid used in the working of the liquid supply device 9 is medical physiological saline, and the liquid supply pressure is 0.2 MPa;

[0061] The laser 1 is arranged below the laser light path 2, the focusing device 3 and the positive pressure cavity 5, and the focusing device 3 is coaxially arranged in the lower shell 15; the positive pressure cavity has a diameter of 3 mm and a height of 1 mm;

[0062] The negative pressure absorbing ring 18 is arranged at the bottom end of the lower shell 15 and is used for absorbing the debris, sewage and other waste generated in the skin processing; the negative pressure absorbing ring 18 is connected to the outer uniform pressure ring 14 through a plurality of circumferentially distributed liquid suction small pipes 17, and the outer uniform pressure ring 14 recycles the waste to the liquid suction device 8 through the liquid suction pipe 10;

[0063] The inner uniform pressure ring 13 is coaxially arranged at the bottom of the upper shell 12, and a plurality of circumferentially distributed liquid supply small pipes 16 are coaxially arranged in the lower shell 15; the liquid generated by the liquid supply device can flow to the positive pressure cavity 4 through the inner uniform pressure ring 13 and the liquid supply pipe 11, and form the liquid film 5; the thickness of the liquid film 5 is 0.5 mm;

[0064] The negative pressure skin fixer 7 is installed at the bottom of the cutting device and is used for continuously absorbing the skin to provide surface tension; the negative pressure of the negative pressure skin fixer 7 is set to -10 kPa.

[0065] The inner spraying and outer absorbing liquid film cooling type skin flap low damage laser cutting method of Example 2 comprises the following steps:

[0066] Step 1, after the surgeon completes the preoperative steps of the skin graft surgery, place the intact skin graft on the sterile negative pressure skin fixator 7, open the negative pressure fixator 7 for continuous suction to maintain the skin surface tension, adjust the three-axis motion mechanism to make the bottom of the lower shell 15 0.5 mm above the surface of the skin graft;

[0067] Step 2, open the liquid supply device 9, set the pressure of the supplied physiological saline to 0.2 MPa, and press the liquid supply device supply pedal;

[0068] Step 3, according to the size requirements of the prepared skin graft, set the output power of the laser 1 and the skin graft processing motion trajectory, and set the output power of the laser 1 to 40 W;

[0069] Step 4, press the laser 1 light control pedal, and the cutting device automatically realizes the cutting operation of the skin graft tissue;

[0070] Step 5, after the cutting operation is completed, release the laser 1 light control pedal and the liquid supply device 9 control pedal, check the skin graft cutting condition, and complete the skin graft preparation.

Claims

1. A low-damage laser cutting device for a liquid film cooling skin flap with internal ejection and external absorption, characterized in that: The low-damage laser cutting device of the internal spraying and external absorbing liquid film cooling type skin flap comprises a three-axis motion mechanism, an internal spraying and external absorbing liquid film cooling cutting head, a laser (1), a negative pressure skin fixer (7), a liquid supply device (9) and a liquid suction device (8); wherein the internal spraying and external absorbing liquid film cooling cutting head is fixed on the three-axis motion mechanism, the laser (1) is fixed on the internal spraying and external absorbing liquid film cooling cutting head, and the negative pressure skin fixer (7) is located at the bottom of the low-damage laser cutting device of the internal spraying and external absorbing liquid film cooling type skin flap. The internal spraying and external absorbing liquid film cooling cutting head comprises an upper shell (12), a focusing device (3) and a lower shell (15); the upper shell (12) and the lower shell (15) are arranged in sequence and close to each other in a top-to-bottom manner, and the cavities in the interiors thereof are sequentially communicated; the laser (1) is arranged on the upper portion or above the upper shell (12); the laser light path (2) of the laser (1) emitting laser light downward is arranged in the cavity in the interior of the upper shell (12); and the focusing device (3) is arranged in the inner cavity of the lower portion of the upper shell (12) and the upper portion of the lower shell (15), the inner cavity being communicated with the laser light path (2) above and with the positive pressure cavity (4) in the inner cavity of the middle portion and the lower portion of the lower shell (15) below. The focusing device (3) is coaxial with the laser light path (2) emitted by the laser (1); the upper shell (12) is provided with two concentric annular grooves, namely an outer equal-pressure ring (14) and an inner equal-pressure ring (13), close to the lower end face; the outer equal-pressure ring (14) is communicated with the liquid suction device (8) through a liquid suction pipe (10), and the inner equal-pressure ring (13) is connected with the liquid supply device (9) through a liquid supply pipe (11); and the lower shell (15) is provided with an annular groove structure, namely a negative pressure liquid suction ring (18), close to the lower end face; the negative pressure liquid suction ring (18) is communicated with the outer equal-pressure ring (14) through a liquid suction small pipe (17). The inner equal-pressure ring (13) is also communicated with the vertical middle portion of the positive pressure cavity (4) through a liquid supply small pipe (16) and outputs liquid flow to the skin surface in the form of a uniform liquid film (5), and the thickness of the liquid film is 0.5-2 mm.

2. The low damage laser cutting device of the inside-injection outside-absorption liquid membrane-cooled skin flap according to claim 1, characterized in that: The laser (1) is a laser with a wavelength of one of the following: 9.3 um, 10.6 um, 355 nm, 532 nm, 1064 nm and 2940 nm.

3. The low damage laser cutting device for the internal-bleeding and external-absorbing liquid film-cooled skin flap according to claim 1, characterized in that: The positive pressure cavity has a diameter of 2-10 mm and a height of 0.2-5 mm.

4. The low damage laser cutting device for the internal-bleeding and external-absorbing liquid film-cooled skin flap according to claim 1, characterized in that: The liquid supply device (9) is a device with a liquid supply pressure of 0.1-3 MPa.

5. The low-damage laser cutting device for the internal-irrigation and external-absorption liquid film cooling skin flap according to any one of claims 1-4, characterized in that: The negative pressure skin fixer (7) is installed at the bottom of the cutting device and is used for continuously attracting the skin by negative pressure to provide surface tension; and the negative pressure skin fixer (7) is a device with a negative pressure value of -2 kPa to -90 kPa.

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