Microneedle firing device for treating pathological scars
By designing a micro-needle firing device with a simple structure, using the mechanical structure of the push rod and piston, uniform firing of the micro-needle is achieved, solving the problem of uneven micro-needle insertion and drug diffusion in the prior art, which is suitable for patients to self-self Manage scar treatments, reducing equipment complexity and cost.
Patent Information
- Application Number
- CN202420497069.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-03-14
AI Technical Summary
The prior art is difficult to effectively treat pathological scars, especially because microneedles are difficult to insert evenly into the skin, uneven drug diffusion, and complex equipment and high cost, which limits the management of self-administration of patients.
A micro-needle firing device with a simple structure is designed, including a shell, base plate, micro-needle, piston and push rod handle. The piston is driven by the push rod handle, and the micro-needle is squeezed and shot out with the thimble to achieve uniform firing of the micro-needle. The firing force is adjusted through elastic parts, which is suitable for patients to self-administer.
It achieves uniform firing of microneedles, improves drug penetration efficiency, simplifies operating procedures, reduces equipment complexity and cost, and is suitable for patients' self-management of scar treatment.
Smart Images
Figure CN222286217U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a microneedle firing device for treating pathological scars. Background Art
[0002] Pathological scars are the result of abnormal healing after the integrity of the skin is destroyed due to various reasons (trauma, surgery, follicular inflammation, burns, electric shock, mosquito bites, etc.), including hypertrophic scars and keloids. Pathological scars are tumor-like hyperplasia on the surface of the skin, often accompanied by itching or tingling and burning sensations. They can cause functional disorders and even deformities in functional parts, affecting the patient's appearance and quality of life. Among the commonly used scar treatment methods currently, surgical excision, radiotherapy or local medication are common. Compared with the shortcomings of surgical treatment, which has large trauma, slow recovery period, high cost and large side effects of radiotherapy, local injection of medication in scars is a method that patients are more accepting because of its precise effect and small trauma. However, injection in scars has the disadvantages of obvious pain, difficult to control depth, and uneven drug diffusion. Pathological scars have the characteristics of recurrence, so multiple medications are often required, and the treatment cycle is long. For the local medication treatment of pathological scars, developing a method that is conducive to patients' self-administration and realizing patients' long-term self-scar treatment management is one of the problems that need to be solved clinically. Although there is needle-free injection technology, due to the hard texture of scar tissue, it is difficult for needle-free injection to penetrate the scar and evenly spread the drug in the scar, and needle-free syringes are expensive. These shortcomings limit the use of needle-free syringes in scar treatment.
[0003] Microneedles are a new type of minimally invasive transdermal drug delivery method that can effectively penetrate the stratum corneum of the skin to produce hundreds of reversible micropores, effectively promoting the penetration of drugs into the stratum corneum to achieve the purpose of treatment. Microneedles can be divided into coated microneedles, hollow microneedles, soluble microneedles, etc. Among them, soluble microneedles can effectively carry therapeutic drugs with polymer compounds as carriers, and do not produce toxic substances after degradation, so they are widely used in microneedles. However, the puncture depth of the microneedle is related to the height of the microneedle and the pressure used. It is difficult to make the microneedle patch evenly stressed by direct pressure with the hand. The microneedle is difficult to insert evenly into the skin and the microneedle is easy to break. At the same time, the microneedle only stays in the superficial layer of the skin and cannot reach the inside of the scar, which makes the microneedle limited in the treatment of pathological scars and is not conducive to the sterile requirements of drug delivery. In addition, if the length of the microneedle is too high, it is still easy to break even if the force is evenly applied. It is possible to promote the control of microneedle balanced pressure through some high-precision mechanical tools in the existing technology, but the implementation requires complex equipment, high cost, and requires professional technicians to operate, which is not suitable for patients to manage self-medication during scar treatment. Utility Model Content
[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a microneedle firing device for treating pathological scars which has a simple structure and is easy to use.
[0005] In order to achieve the purpose, the technical solution of the utility model is as follows: a microneedle firing device for treating pathological scars, comprising a shell, a base plate, a microneedle, a piston and a push rod handle, the shell being in the shape of a slot with the slot facing downward, the base plate being installed at the slot of the shell, the base plate being evenly distributed with embedding holes, each of the embedding holes being embedded with a microneedle, and the needle tip of the microneedle facing downward, the piston being vertically slidably arranged in the shell, a plurality of ejector pins being evenly distributed at its lower end, and the plurality of ejector pins corresponding to the plurality of embedding holes one by one, each ejector pin being aligned with the corresponding embedding hole, the push rod handle being vertically arranged and passing through the upper end of the shell, the lower end of the push rod handle being connected to the upper end of the piston, the push rod handle being pushed downward to drive the piston to move downward, and the plurality of microneedles being squeezed by the plurality of ejector pins to be ejected downward.
[0006] The beneficial effect of the above technical solution is that its structure is simple, so the piston can be pushed downward manually through the push rod handle, and the multiple ejector pins at the lower end of the piston squeeze the multiple microneedles on the base plate downward to eject them into the skin.
[0007] The above technical solution also includes a trumpet-shaped bearing seat, and the smaller opening end of the bearing seat is connected to the open end of the shell.
[0008] The beneficial effect of the above technical solution is that when in use, the larger end of the opening of the support seat can be placed against the skin, and the scar is located inside the support seat, which makes it more convenient for medical staff to operate the microneedle firing device.
[0009] The supporting seat in the above technical solution is made of transparent material.
[0010] The beneficial effect of the above technical solution is that the situation inside the bearing seat can be conveniently observed.
[0011] In the above technical solution, a slide groove is vertically arranged on the inner wall of the shell, and a slide tooth extending into the slide groove is arranged on the outer side wall of the piston.
[0012] The beneficial effect of the above technical solution is that it can prevent the piston from rotating in the housing and causing the ejector pin and the corresponding microneedle to be misaligned.
[0013] In the above technical solution, a plurality of sliding teeth and a plurality of sliding grooves are provided, and the plurality of sliding teeth and the plurality of sliding grooves are respectively distributed circumferentially at intervals, and the plurality of sliding teeth and the plurality of sliding grooves correspond to each other one by one, and each sliding tooth extends into the corresponding sliding groove.
[0014] The beneficial effect of the above technical solution is that the piston has better stability when sliding up and down in the housing.
[0015] The above technical solution also includes a first elastic member and a trigger member, the first elastic member is arranged in the outer shell, and the lower end of the push rod handle is connected to the upper end of the piston through the first elastic member, the elastic force of the first elastic member drives the piston to move downward, and a limiting groove is provided on the side wall of the piston, the trigger member has a limiting tooth located in the outer shell and extending into the limiting groove, and the trigger member also has a trigger part located outside the outer shell, the trigger part is artificially triggered to pull the limiting tooth out of the limiting groove, and the piston slides downward under the elastic force of the first elastic member.
[0016] The beneficial effect of the above technical solution is that the downward sliding of the piston is triggered by the elastic force of the first elastic member, and the downward firing force of the first elastic member can be adjusted by adjusting the height of the push rod handle. When the push rod handle is pushed downward, the compression of the first elastic member increases, and the force of the piston being fired is greater at this time. If the push rod handle is pulled upward, the compression of the first elastic member decreases, and the force of the piston being fired is reduced at this time. The trigger member is used on the outer shell to limit the position of the piston. After the position of the push rod handle is adjusted, the limit on the piston can be released by the trigger member, and the piston can be quickly fired downward under the elastic force of the first elastic member.
[0017] In the above technical solution, there are two trigger members and two limit grooves, the two limit grooves are oppositely arranged on the side wall of the piston, the two trigger members are oppositely arranged on the side wall of the outer shell, the two trigger members and the two limit grooves correspond one to one, and each limit tooth extends into the corresponding limit groove.
[0018] The beneficial effect of the above technical solution is that the two triggering members can symmetrically limit the position of the piston, and the limiting effect is good.
[0019] In the above technical solution, a through hole aligned with the limit groove is provided on the side wall of the shell, and the trigger member includes a second elastic member and a swing plate which is vertically arranged and the middle part of which is swingably connected to the shell, the swing plate is close to the corresponding through hole, and the upper end or the lower end of the swing plate is bent through the through hole to extend into the limit groove, the bent end of the swing plate constitutes the limit tooth, and the other end of the swing plate constitutes the trigger part, the second elastic member is arranged between the shell and the trigger part, and the elastic force of the second elastic member is used to drive the trigger part to swing away from the shell so as to extend the limit tooth into the limit groove.
[0020] The beneficial effect of the above technical solution is that the structure of the triggering member is simple, and when it is triggered, the limiting tooth can be withdrawn from the limiting groove by only pressing the triggering part.
[0021] In the above technical solution, the push rod handle is provided with an enlarged portion located inside the outer shell, and a plurality of shift holes are vertically spaced on the side wall of the outer shell, and the plurality of shift holes are all located above the trigger member, and an elastic pin is embedded in the enlarged portion, and the pin end of the elastic pin faces horizontally outward, and when the push rod handle slides up and down, the pin end of the elastic pin can be aligned with any one of the shift holes and extend into the corresponding shift hole to vertically limit the push rod handle.
[0022] The beneficial effect of the above technical solution is that the push rod handle can be pushed to align the elastic pin thereon with any gear hole, so that the height adjustment of the push rod handle can be achieved. After the height of the push rod handle is adjusted to the right position, the trigger member can be used to release the piston to slide downward.
[0023] The elastic pin described in the above technical solution is an elastic limiting bead.
[0024] The beneficial effect of the above technical solution is that it has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a cross-sectional view of the microneedle firing device described in Example 1 of the utility model;
[0026] Figure 2 This is a schematic diagram of the installation of the base plate and the microneedle in Example 1 of the present utility model;
[0027] Figure 3 It is a top view of the base plate described in Example 1 of the utility model;
[0028] Figure 4 This is a bottom view of the piston described in Example 1 of the utility model;
[0029] Figure 5 This is a schematic diagram of the cooperation between the sliding teeth and the sliding groove in Example 1 of the utility model;
[0030] Figure 6 This is another schematic diagram of the matching of the sliding tooth and the sliding groove in Embodiment 1 of the utility model;
[0031] Figure 7 It is a cross-sectional view of the microneedle firing device described in Utility Model Example 2;
[0032] Figure 8 This is a schematic diagram of the structure of the swing plate described in Example 2 of the utility model.
[0033] In the figure: 1. shell; 11. slide groove; 12. through hole; 13. gear hole; 2. base plate; 21. embedding hole; 3. microneedle; 4. piston; 41. ejector pin; 42. slide tooth; 43. limit groove; 44. air vent; 5. push rod handle; 51. expansion part; 52. elastic pin; 6. bearing seat; 7. first elastic member; 8. trigger member; 81. second elastic member; 82. swing plate; 821. limit tooth; 822. trigger part; 83. hinge seat; 9. cover. DETAILED DESCRIPTION
[0034] The following describes the principles and features of the present invention. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. All technologies implemented based on the above content of the present invention are included in the scope of protection of the present invention.
[0035] Example 1
[0036] like Figure 1-Figure 4 As shown, this embodiment provides a microneedle firing device for treating pathological scars, comprising a housing 1, a base plate 2, a microneedle 3, a piston 4 and a push rod handle 5, wherein the housing 1 is in the shape of a slot body, with the slot facing downward, the base plate 2 is installed at the slot of the housing 1, the base plate 2 is evenly distributed with embedding holes 21, each of the embedding holes 21 is embedded with a microneedle 3, and the needle tip of the microneedle 3 faces downward, the piston 4 is vertically slidably arranged in the housing 1, and a plurality of ejector pins 41 are evenly distributed at the lower end thereof, and the plurality of ejector pins 41 are connected to the plurality of embedding holes 21. The holes 21 correspond one to one, and each of the ejector pins 41 is aligned with the corresponding embedding hole 21. The push rod handle 5 is vertically arranged and passes through the upper end of the shell 1. The lower end of the push rod handle 5 is connected to the upper end of the piston 4. The push rod handle 5 is pushed downward to drive the piston 4 to move downward, and the multiple ejector pins 41 squeeze the multiple microneedles 3 to be ejected downward. The structure is simple, so that the piston can be pushed downward by the push rod handle, and the multiple ejector pins at the lower end of the piston squeeze the multiple microneedles on the base plate to be ejected downward into the skin.
[0037] The above technical solution also includes a trumpet-shaped supporting seat 6, the smaller opening end of the supporting seat 6 is connected to the open end of the shell 1, so that the larger opening end of the supporting seat can be placed against the skin when in use, and the scar is located inside the supporting seat, which makes it more convenient for medical staff to operate the microneedle firing device.
[0038] The support seat 6 in the above technical solution is a transparent material part (can be a transparent plastic part), so that the situation inside the support seat can be easily observed.
[0039] In this embodiment, the plurality of embedding holes are distributed in an array on the base plate, the lower end of each microneedle is sharp, and the upper end is a thick end and embedded in the corresponding embedding hole, the upper end of the microneedle is located in the inner middle part of the corresponding embedding hole, and the ejector pin can be a truncated cone with its tip facing downward, and can be inserted into the corresponding embedding hole to eject the microneedle downward until it is fired.
[0040] like Figure 5 and Figure 6 As shown, when the inner hole of the shell is a circular hole and the piston is a circular column, in order to prevent the piston from rotating in the shell, a slide groove 11 is vertically provided on the inner wall of the shell 1, and a sliding tooth 42 extending into the slide groove 11 is provided on the outer wall of the piston 4, so as to prevent the piston from rotating in the shell and causing the ejector pin and the corresponding microneedle to be misaligned [when the inner hole of the shell is non-circular, such as square or elliptical, the piston also cooperates with the inner hole of the shell, and there is no need to set a slide groove and a sliding tooth, and no relative rotation will occur at this time].
[0041] In the above technical solution, a plurality of sliding teeth 42 and a plurality of sliding grooves 11 are provided, and the plurality of sliding teeth 42 and the plurality of sliding grooves 11 are respectively distributed circumferentially at intervals, and the plurality of sliding teeth 42 and the plurality of sliding grooves 11 correspond one to one, and each sliding tooth 42 extends into the corresponding sliding groove 11, so that the piston has better stability when sliding up and down in the outer shell.
[0042] The microneedles described in this embodiment are preferably made of absorbable materials, such as PCL degradable plastic, PPDO degradable plastic or PLGA degradable plastic, but are certainly not limited thereto [preferably, in order to achieve excellent biocompatible microneedles while having good mechanical properties, the microneedle carrier matrix material is a mixture of hyaluronic acid (molecular weight 10000-20000da) and PVP K30]. In order to facilitate the microneedles to penetrate the skin to different depths, in this embodiment, a plurality of the microneedles are distributed in an array on the base plate, and the number of the microneedles is 60-99, the length of the microneedles is 300-450μm, the diameter of the base is 300μm, the spacing between adjacent microneedles is approximately 1mm, and the microneedle shape can be pyramidal, cone-shaped, etc.
[0043] The microneedles are loaded with drugs for treating scars. Preferably, in order to achieve excellent therapeutic effects on pathological scars, the drugs carried by the microneedles are triamcinolone acetonide, betamethasone, 5-fluorouracil, or a mixture of at least one of triamcinolone acetonide and betamethasone and 5-fluorouracil.
[0044] In this embodiment, the piston can be a hard plastic part, and a certain gap can be reserved between it and the inner wall of the shell to avoid the same pressure in the space above and below the piston when the piston moves up and down to avoid resistance caused by unbalanced air pressure. At the same time, the friction resistance between the piston and the shell can also be reduced. Of course, the piston can also be provided with air holes 44 running through the upper and lower parts to balance the air pressure in the areas above and below it.
[0045] Example 2
[0046] Same as Example 1, except that Figure 7 and Figure 8 As shown, the above technical solution also includes a first elastic member 7 and a trigger member 8, the first elastic member 7 is arranged in the housing 1, and the lower end of the push rod handle 5 is connected to the upper end of the piston 4 through the first elastic member 7, the elastic force of the first elastic member 7 drives the piston 4 to move downward, and the side wall of the piston 4 has a limiting groove 43, the trigger member 8 has a limiting tooth 821 located in the housing 1 and extending into the limiting groove 43, and the trigger member 8 also has a trigger part 822 located outside the housing 1, and the trigger part 822 is artificially triggered to pull the limiting tooth 821 out of the limiting groove 43, and the piston 4 is in the first The elastic force of the elastic member 7 slides downward, so that the piston slides downward and is triggered by the elastic force of the first elastic member, and the downward triggering force of the first elastic member can be adjusted by adjusting the height of the push rod handle. When the push rod handle is pushed downward, the compression of the first elastic member increases, and the force of the piston being fired is greater at this time. If the push rod handle is pulled upward, the compression of the first elastic member decreases, and the force of the piston being fired is reduced at this time. Among them, the trigger member is used to limit the position of the piston on the outer shell. After the position of the push rod handle is adjusted, the limit on the piston can be released by the trigger member, and the piston can be quickly fired downward under the elastic force of the first elastic member.
[0047] In the above technical solution, there are two trigger members 8 and two limiting grooves 43, and the two limiting grooves 43 are relatively arranged on the side wall of the piston 4, and the two trigger members 8 are relatively arranged on the side wall of the outer shell 1. The two trigger members 8 and the two limiting grooves 43 correspond one to one, and each limiting tooth 821 extends into the corresponding limiting groove 43, so that the two trigger members can symmetrically limit the piston, and the limiting effect is good.
[0048] In the above technical solution, a through hole 12 is provided on the side wall of the shell 1, which is aligned with the limit groove 43. The trigger member 8 includes a second elastic member 81 and a swing plate 82 which is vertically arranged and the middle part of which is swingably connected to the shell 1. The swing plate 82 is close to the corresponding through hole 12. The upper end or the lower end of the swing plate 82 is bent through the through hole 12 to extend into the limit groove 43. The bent end of the swing plate 82 constitutes the limit tooth 821, and the other end of the swing plate 82 constitutes the trigger part 822. The second elastic member 81 is arranged between the shell 1 and the trigger part 822. The elastic force of the second elastic member 81 is used to drive the trigger part 822 to swing away from the shell 1 so as to extend the limit tooth 821 into the limit groove 43. In this way, the structure of the trigger member is simple, and when it is triggered, the limit tooth can be withdrawn from the limit groove by pressing the trigger part.
[0049] In the above technical solution, the push rod handle 5 is provided with an enlarged portion 51 located in the shell 1, and a plurality of shift holes 13 are vertically spaced on the side wall of the shell 1, and the plurality of shift holes 13 are located above the trigger member 8. An elastic pin 52 is embedded in the enlarged portion 51, and the pin end of the elastic pin 52 is horizontally facing outward. When the push rod handle 5 slides up and down, the pin end of the elastic pin 52 can be aligned with any one of the shift holes 13 and extend into the corresponding shift hole 13 to vertically limit the push rod handle 5, so that the push rod handle can be pushed to the elastic pin thereon and any one of the shift holes Align, so as to achieve the height adjustment of the push rod handle. After the height of the push rod handle is adjusted to the right position, the trigger member can be used to release the piston to slide downward [preferably, in this embodiment, the elastic pins can be arranged two oppositely on the enlarged part, and the pin ends of the two elastic pins are away from each other, and the shift holes on the shell are arranged in two rows (each row has a plurality of shift holes spaced apart from each other), and the two rows of shift holes are relatively distributed on the shell, and the two elastic pins are inserted into the two shift holes at the same time, that is, the number of holes in the two rows of shift holes is the same, and they are aligned with each other, and the horizontal heights of the two elastic pins are also the same].
[0050] Preferably, the push rod handle can only move up and down relative to the shell but cannot rotate. In this case, the cross-section of the push rod handle can be made non-circular, and the push rod handle can be circumferentially limited at the position where it passes through the top of the shell (preferably, the cross-section of the push rod handle can be square or elliptical, of course not limited to this).
[0051] The elastic pin 52 in the above technical solution is an elastic limiting bead, and its structure is simple.
[0052] In this embodiment, the swing plate and the housing can be swingably connected via a hinge seat 83 (the hinge seat and its connection with the housing and the swing plate belong to the prior art and will not be described in detail here).
[0053] In this embodiment, both the first elastic member and the second elastic member may be springs.
[0054] The microneedle firing device provided in this embodiment may further include a slot-shaped cover 9, and the cover 9 is detachably sleeved on the larger opening end of the support seat 6. When the microneedle firing device is used, the cover can be removed in advance.
[0055] In order to facilitate the regulation of the depth of microneedle puncture of the skin, the depth of microneedle penetration into the skin can be marked at each gear hole, so that the user can conveniently adjust the push rod handle to the corresponding height as needed.
[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A microneedle firing device for treating pathological scars, characterized in that: The invention comprises a housing (1), a base plate (2), a microneedle (3), a piston (4) and a push rod handle (5); the housing (1) is in the shape of a slot, with the slot facing downward; the base plate (2) is installed at the slot of the housing (1); the base plate (2) is evenly distributed with mounting holes (21); each mounting hole (21) is embedded with a microneedle (3), and the needle tip of the microneedle (3) faces downward; the piston (4) is vertically slidably arranged in the housing (1), and a plurality of ejector pins are evenly distributed at the lower end thereof. (41), and the plurality of ejector pins (41) correspond one-to-one to the plurality of embedding holes (21), each of the ejector pins (41) is aligned with the corresponding embedding hole (21), the push rod handle (5) is vertically arranged and passes through the upper end of the housing (1), the lower end of the push rod handle (5) is connected to the upper end of the piston (4), the push rod handle (5) is pushed downward to drive the piston (4) to move downward, and the plurality of ejector pins (41) fire the plurality of microneedles (3) to be ejected downward.
2. The microneedle firing device for treating pathological scars according to claim 1, characterized in that: It also comprises a trumpet-shaped bearing seat (6), the smaller opening end of the bearing seat (6) being butted against the open end of the housing (1).
3. The microneedle firing device for treating pathological scars according to claim 2, characterized in that: The bearing seat (6) is made of a transparent material.
4. The microneedle firing device for treating pathological scars according to claim 1, characterized in that: A sliding groove (11) is vertically arranged on the inner wall of the housing (1), and a sliding tooth (42) extending into the sliding groove (11) is arranged on the outer wall of the piston (4).
5. The microneedle firing device for treating pathological scars according to claim 4, characterized in that: A plurality of the sliding teeth (42) and the sliding grooves (11) are provided, and the plurality of the sliding teeth (42) and the plurality of the sliding grooves (11) are respectively distributed in an annular direction at intervals, and the plurality of the sliding teeth (42) and the plurality of the sliding grooves (11) correspond one to one, and each of the sliding teeth (42) extends into the corresponding sliding groove (11).
6. The microneedle firing device for treating pathological scars according to any one of claims 1 to 5, characterized in that: The invention also comprises a first elastic member (7) and a trigger member (8), wherein the first elastic member (7) is arranged in the housing (1), and the lower end of the push rod handle (5) is connected to the upper end of the piston (4) through the first elastic member (7), the elastic force of the first elastic member (7) drives the piston (4) to move downward, and a limiting groove (43) is provided on the side wall of the piston (4), and the trigger member (8) has a limiting tooth (821) located in the housing (1) and extending into the limiting groove (43), and the trigger member (8) also has a trigger part (822) located outside the housing (1), and the trigger part (822) is manually triggered to pull the limiting tooth (821) out of the limiting groove (43), and the piston (4) slides downward under the elastic force of the first elastic member (7).
7. The microneedle firing device for treating pathological scars according to claim 6, characterized in that: There are two trigger members (8) and two limit grooves (43), the two limit grooves (43) are arranged on the side wall of the piston (4) opposite to each other, and the two trigger members (8) are arranged on the side wall of the housing (1) opposite to each other. The two trigger members (8) and the two limit grooves (43) correspond one to one, and each limit tooth (821) extends into the corresponding limit groove (43).
8. The microneedle firing device for treating pathological scars according to claim 7, characterized in that: A through hole (12) aligned with the limiting groove (43) is provided on the side wall of the housing (1); the trigger member (8) comprises a second elastic member (81) and a swing plate (82) arranged vertically and connected to the housing (1) at its center; the swing plate (82) is close to the corresponding through hole (12); the upper end or the lower end of the swing plate (82) is bent through the through hole (12) to extend into the limiting groove (43); the bent end of the swing plate (82) constitutes the limiting tooth (821); the other end of the swing plate (82) constitutes the trigger portion (822); the second elastic member (81) is arranged between the housing (1) and the trigger portion (822); the elastic force of the second elastic member (81) is used to drive the trigger portion (822) to swing away from the housing (1) so as to extend the limiting tooth (821) into the limiting groove (43).
9. The microneedle firing device for treating pathological scars according to claim 6, characterized in that: The push rod handle (5) is provided with an enlarged portion (51) located inside the outer shell (1), and a plurality of shift holes (13) are vertically spaced apart on the side wall of the outer shell (1), and the plurality of shift holes (13) are all located above the trigger member (8). An elastic pin (52) is embedded in the enlarged portion (51), and the pin end of the elastic pin (52) faces horizontally outward. When the push rod handle (5) slides up and down, the pin end of the elastic pin (52) can be aligned with any one of the shift holes (13) and extend into the corresponding shift hole (13) to vertically limit the push rod handle (5).
10. The microneedle firing device for treating pathological scars according to claim 9, characterized in that: The elastic pin (52) is an elastic limiting bead.