Treatment head and treatment device
By setting a pressure relief port on the mounting cavity wall of the treatment head, the problem of air pressure changes caused by the movement of microneedles and needle plates is solved, ensuring air pressure balance and improving treatment efficacy and safety.
Patent Information
- Application Number
- CN202423008969.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-04
AI Technical Summary
The existing treatment head causes changes in internal air pressure when the microneedles and needle plate move, affecting the movement of the needle plate and the treatment effect.
A pressure relief port connected to the outside is provided on the wall of the mounting cavity of the treatment head, located between the needle plate assembly and the needle outlet, to ensure air pressure balance. Air is discharged or drawn in through the pressure relief port to keep the air pressure inside and outside the mounting cavity consistent.
This allows for smooth movement of the needle plate assembly, improving treatment efficacy and safety while reducing damage to the patient's skin.
Smart Images
Figure CN223818031U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a treatment head and treatment device. Background Technology
[0002] Microneedling, as a medical treatment for skin conditions, has been widely applied in the treatment of skin tissues. Currently, microneedling technologies on the market include various forms such as injectable hollow microneedles, radiofrequency microneedles, and nanoneedles, which promote collagen regeneration, drug delivery, and skin repair through different mechanisms. The treatment head mainly consists of a shell, microneedles, and a needle plate. By aligning the end face of the treatment head with the treatment area, the needle plate drives the microneedles to extend from the exit port of the shell, thus adjusting the treatment depth.
[0003] In existing radiofrequency treatment head designs, the microneedle assembly is driven to reciprocate within the treatment head housing, allowing it to penetrate and withdraw from the skin tissue. During penetration, radiofrequency energy is released to treat the skin. However, in drug-injection microneedling technology, a high degree of sealing of the injection channel within the treatment head housing is crucial during drug injection. Because the needle outlet is in close contact with the treated skin, the air pressure on the side of the needle plate facing the outlet increases or decreases as the drive plate moves closer to or further away from it, affecting the movement of the needle plate and the treatment effect. Therefore, while satisfying the reciprocating motion of the drug-injection microneedle, leak-proof and air pressure balance designs must be considered. Utility Model Content
[0004] The main purpose of this invention is to provide a treatment head and treatment device that aims to solve the problem that changes in the internal air pressure of the treatment head, which affect the movement of the needle plate and the treatment effect, occur when the microneedles and needle plates of the existing treatment head move.
[0005] To achieve the above objectives, the present invention provides a treatment head comprising a housing, a needle plate assembly, and microneedles; the housing has a mounting cavity, and one end of the housing has a needle outlet communicating with the mounting cavity; the needle plate assembly is movably disposed within the mounting cavity and is sealed to the inner wall of the housing; the microneedles include at least one hollow needle, which is mounted on the needle plate assembly and extends through the needle outlet under the drive of the needle plate assembly;
[0006] The cavity wall of the mounting cavity is provided with a pressure relief port that communicates with the outside. The pressure relief port is located between the needle plate assembly and the needle outlet.
[0007] In one embodiment of this utility model, a plurality of pressure relief ports are provided, and the plurality of pressure relief ports are arranged at intervals on the periphery of the housing.
[0008] In one embodiment of this utility model, the needle plate assembly includes a needle seat and a first sealing ring;
[0009] The first sealing ring is sleeved on the outer periphery of the needle seat. The needle plate is tightly fitted with the inner wall of the mounting cavity through the first sealing ring. An injection cavity is formed inside the needle seat. A first microneedle channel is opened at one end of the needle seat facing the needle outlet. The end of the microneedle away from the needle outlet passes through the first microneedle channel and communicates with the injection cavity.
[0010] In one embodiment of the present invention, a limiting groove is formed on the outer periphery of the needle seat, and the first sealing ring is partially embedded in the limiting groove.
[0011] In one embodiment of the present invention, the needle plate assembly further includes a first sealing layer, which is disposed in the injection cavity and located on the side of the injection cavity near the needle outlet. The first sealing layer seals the gap between the microneedle and the inner wall of the first microneedle channel.
[0012] In one embodiment of the present invention, the needle holder assembly further includes a circuit board, and the needle holder includes a main body and a base;
[0013] The main body has the injection cavity and the first microneedle channel. The base is detachably connected to the end of the main body facing the needle outlet. The outer periphery of the base is fitted with the first sealing ring. The circuit board is sandwiched between the main body and the base. The circuit board has a second microneedle channel. The microneedle also includes at least one solid needle. One end of the solid needle passes through the second microneedle channel and the first microneedle channel and is electrically connected to the circuit board.
[0014] In one embodiment of this utility model, a second sealing ring is provided between the circuit board and the base, and the circuit board is sealed to the base through the second sealing ring.
[0015] In one embodiment of the present invention, at least a portion of the space between the solid needle and the inner wall of the second microneedle channel is filled with a sealant.
[0016] In one embodiment of the present invention, a clearance hole is provided in the center of the base, and the solid needle passes through the clearance hole and is sealed to the circuit board.
[0017] This utility model also proposes a treatment device, which includes a treatment handle and a treatment head as described above.
[0018] The treatment head proposed in this invention includes a housing, a needle plate assembly, and microneedles. The housing has a mounting cavity, and one end of the housing has a needle outlet communicating with the mounting cavity. The needle plate assembly is movably mounted in the mounting cavity, and the needle plate assembly is sealed to the inner wall of the housing. The microneedles are mounted on the needle plate assembly, and a pressure relief port communicating with the outside is provided on the wall of the mounting cavity between the needle outlet and the needle plate assembly. When microneedle treatment is required, the needle plate assembly drives the microneedles to move towards or away from the needle outlet. During the movement, air on the side of the needle plate assembly facing the needle outlet can be discharged to the outside or enter the mounting cavity through the pressure relief port, thereby maintaining the air pressure inside the mounting cavity consistent with the outside, ensuring smooth movement of the needle plate assembly and achieving the expected therapeutic effect. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 A cross-sectional view of the treatment head provided by this utility model;
[0021] Figure 2 for Figure 1 Cross-sectional view of the needle plate assembly and microneedles in the treatment head.
[0022] Explanation of icon numbers:
[0023] 10. Housing; 11. Mounting cavity; 12. Pressure relief port; 13. Needle outlet; 20. Needle plate assembly; 21. Needle seat; 211. Main body; 211a. First microneedle channel; 212. Base support; 212a. Clearance hole; 213. Injection chamber; 214. Injection port; 22. Circuit board; 221. Second microneedle channel; 23. First sealant layer; 30. Microneedle; 31. Hollow needle; 32. Solid needle; 40. First sealing ring; 50. Second sealing ring.
[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0028] This utility model proposes a treatment head.
[0029] Combination Figure 1 As shown, in one embodiment of this utility model, the treatment head includes a housing 10, a needle plate assembly 20, and microneedles 30; the housing 10 forms a mounting cavity 11, and one end of the housing 10 is provided with a needle outlet 13 communicating with the mounting cavity 11; the needle plate assembly 20 is movably disposed in the mounting cavity 11 and is sealed to the inner wall of the housing 10; the microneedles 30 include at least one hollow needle 31, the microneedles 30 are mounted on the needle plate assembly 20, and the microneedles 30 pass through the needle outlet 13 under the drive of the needle plate assembly 20; wherein, the cavity wall of the mounting cavity 11 is provided with a pressure relief port 12 communicating with the outside, and the pressure relief port 12 is located between the needle plate assembly 20 and the needle outlet 13.
[0030] In this embodiment, the mounting cavity 11 formed inside the housing 10 is used to accommodate the needle plate assembly 20 and the microneedles 30. One end of the housing 10 is provided with a needle outlet 13, which is a channel for the microneedles 30 to extend out of the housing 10. The needle outlet 13 is circular in shape, with a diameter slightly larger than the diameter of the microneedles 30. Multiple microneedles 30 and needle outlets 13 are provided, wherein each of the multiple microneedles 30 includes at least one hollow needle 31. In some other embodiments, the multiple microneedles 30 also include at least one solid needle 32, and the solid needles 32 and hollow needles 31 are arranged in a matrix.
[0031] In the above embodiments, each microneedle 30 corresponds to a needle outlet 13. During microneedle treatment, each microneedle 30 passes through a corresponding needle outlet 13 to simultaneously treat multiple treatment points in the treatment area. When the microneedle 30 is a hollow needle 31, the treatment head can inject beauty fluid to achieve the purpose of water light therapy; when the microneedle 30 is a solid needle, the treatment head can emit radio frequency energy to achieve the purpose of radio frequency therapy; of course, the microneedle 30 can also be a hollow conductive needle, which can simultaneously inject beauty fluid and emit radio frequency energy to achieve the purpose of simultaneous radio frequency therapy and water light therapy.
[0032] Whether it's mesotherapy or radiofrequency therapy, it's crucial to prevent external liquids (such as blood or waste treatment fluid) from entering the side of the needle plate assembly 20 away from the needle outlet 13. Therefore, the needle plate assembly 20 is sealed to the inner wall of the housing 10 to prevent waste fluid from contaminating the treatment fluid or causing short circuits in other conductive components such as the circuit board 22. The portion of the needle plate assembly 20 and / or the inner wall of the housing 10 that is at least partially in contact can be designed as an elastic structure, achieving a sealed fit through elastic compression or interference fit. Alternatively, an elastic element can be placed between the needle plate assembly 20 and the inner wall of the housing 10, achieving a sealing effect by compressing the elastic element. When the needle plate assembly 20 is driven to move towards the needle outlet 13, it seals against the inner wall of the housing 10's cavity, forming a reciprocating structure similar to a plunger, simultaneously driving the movement of the microneedle 30 and providing a seal.
[0033] The pressure relief port 12 formed on the wall of the mounting cavity 11 can be a small hole or an opening of a certain length. The pressure relief port 12 is positioned between the needle outlet 13 and the needle plate assembly 20 to ensure that the air pressure inside and outside the mounting cavity 11 is balanced through the pressure relief port 12 when the needle plate assembly 20 moves toward or away from the needle outlet 13, thereby reducing the resistance when the needle plate assembly 20 moves and improving the stability of the microneedle 30 movement and the therapeutic effect.
[0034] In one embodiment of the present invention, a plurality of pressure relief ports 12 are provided, and the plurality of pressure relief ports 12 are arranged at intervals on the periphery of the housing 10.
[0035] In this embodiment, the pressure relief port 12 is a small hole. By setting multiple pressure relief ports 12, rapid exhaust or intake can be achieved, and the needle plate assembly 20 can quickly maintain the air pressure in the mounting cavity 11 in balance with the external environment when moving. Compared with setting a single large pressure relief port 12, the solution in this embodiment reduces the size of the pressure relief port 12, preventing more dust and debris from entering the mounting cavity 11 through the pressure relief port 12. At the same time, compared with setting a single small pressure relief port 12, increasing the number of pressure relief ports 12 can achieve more efficient pressure balance. When one pressure relief port 12 is blocked by foreign objects, the remaining pressure relief ports 12 can be used to maintain air pressure balance.
[0036] Furthermore, these pressure relief ports 12 are spaced apart along the periphery of the housing 10 so that when the needle plate assembly 20 moves, the instantaneous pressure at different positions in the mounting cavity 11 facing the needle outlet 13 can quickly become uniform, making the force on the needle plate assembly 20 more uniform. This design makes the microneedle 30 extend and retract more quickly and smoothly, reducing damage to the patient's skin and improving the safety and effectiveness of the treatment.
[0037] Combination Figure 1 As shown, in one embodiment of the present invention, the needle plate assembly 20 includes a needle seat 21 and a first sealing ring 40; the first sealing ring 40 is sleeved on the outer periphery of the needle seat 21, and the needle seat 21 is tightly fitted with the inner wall of the mounting cavity 11 through the first sealing ring 40. An injection cavity 213 is formed inside the needle seat 21, and a first microneedle channel 211a is opened at one end of the needle seat 21 facing the needle outlet 13. The hollow needle 31 passes through the first microneedle channel 211a at one end away from the needle outlet 13 and communicates with the injection cavity 213.
[0038] In this embodiment, the first sealing ring 40 is made of silicone or rubber, possessing good elasticity and sealing performance, and can tightly fit the inner wall of the mounting cavity 11 to prevent liquid or air leakage. By setting the first sealing ring 40, not only is the sealing performance of the treatment head improved, but its adaptability to different environments is also enhanced. For example, in humid or dusty environments, the first sealing ring 40 can effectively prevent the intrusion of moisture and dust, protecting the internal components from damage.
[0039] The first sealing ring 40 is sleeved on the outer periphery of the needle hub 21 and fits tightly against the inner wall of the housing 10, ensuring the sealing performance within the mounting cavity 11. Furthermore, the design of the first sealing ring 40 helps reduce friction between the needle hub 21 and the inner wall of the housing 10 during movement, extending the service life of the treatment head. It is understood that in this embodiment, multiple first sealing rings 40 can be provided between the outer periphery of the needle hub 21 and the inner wall of the mounting cavity 11 to enhance the sealing effect.
[0040] The needle holder 21 has an injection chamber 213 inside, used to store drugs or therapeutic fluid so that the drugs can be directly delivered to the treatment area when the microneedle 30 is inserted into the skin. An injection port 214 is provided on one side of the needle holder 21, connecting the injection chamber 213 and the injection device, for injecting drugs into the injection chamber 213. A first microneedle channel 211a is formed at the end of the needle holder 21 facing the needle outlet 13, serving as a guide for the microneedle 30 to be installed on the needle holder 21. The microneedle 30 is a hollow needle 31, one end of which passes through the channel and communicates with the injection chamber 213.
[0041] Combination Figure 1 As shown, in one embodiment of the present invention, a limiting groove is formed on the outer periphery of the needle seat 21, and the first sealing ring 40 is partially embedded in the limiting groove.
[0042] In this embodiment, the limiting groove is annular and surrounds the outer periphery of the needle holder 21 to facilitate the fitting of the first sealing ring 40 with the limiting groove. The first sealing ring 40 is partially embedded in the limiting groove and partially protrudes from the limiting groove, sealingly engaging with the inner wall of the housing 10. The limiting groove limits the first sealing ring 40, thereby improving the stability of the first sealing ring 40 within the limiting groove as the needle holder 21 moves toward the needle outlet 13. Furthermore, placing the limiting groove at the end of the needle holder 21 near the needle outlet 13 enhances the sealing effect of the first sealing ring 40 on the injection chamber 213 of the needle holder 21.
[0043] Combination Figure 1 As shown, in one embodiment of the present invention, the needle plate assembly 20 further includes a first sealing layer 23. The first sealing layer 23 is disposed in the injection cavity 213 and located on the side of the injection cavity 213 near the needle outlet 13. The first sealing layer 23 seals the gap between the hollow needle 31 and the first microneedle channel 211a.
[0044] In this embodiment, the first sealant layer 23 is formed by curing medical-grade UV-curable adhesive, fibrin glue, or other adhesives. Its main function is to seal the gap between the hollow needle 31 and the inner wall of the first microneedle channel 211a, so as to ensure that the drug or liquid in the injection chamber 213 will not leak from the first microneedle channel 211a, and at the same time, it can also prevent external contaminants from entering the injection chamber 213 through the first microneedle channel 211a.
[0045] In addition, the end of the solid needle 32 furthest from the needle outlet 13 is also inserted into the first microneedle channel 211a, and the first sealant layer 23 is also used to seal the gap between the solid needle 31 and the first microneedle channel 211a. The first sealant layer 23 not only enhances the sealing of the treatment head, but also improves the reliability of the connection between the microneedle 30 and the needle holder 21. After curing, the first sealant layer 23 fixes the microneedle 30 and the needle holder 21 together, so that the needle plate assembly 20 can accurately and stably drive the microneedle 30 to move.
[0046] Combination Figure 1 As shown, in one embodiment of the present invention, the needle holder 21 assembly further includes a circuit board 22, and the needle holder 21 includes a main body 211 and a base 212;
[0047] The main body 211 has an injection cavity 213 and a first microneedle channel 211a. The base 212 is detachably connected to the end of the main body 211 facing the needle outlet 13. A first sealing ring 40 is sleeved on the outer periphery of the base 212. The circuit board 22 is sandwiched between the main body 211 and the base 212. The circuit board 22 has a second microneedle channel 221. One end of the solid needle 32 passes through the second microneedle channel 221 and the first microneedle channel 211a and is electrically connected to the circuit board 22.
[0048] In this embodiment, the solid needle 32 is electrically connected to the circuit board 22. The solid needle 32 is made of conductive material so that it can generate radio frequency energy or electrical stimulation energy. In combination with the above embodiments, it can be seen that this application provides a treatment head that integrates drug delivery and electrotherapy functions, which broadens the application scope of microneedle 30 treatment and improves the treatment effect.
[0049] The circuit board 22 is clamped between the main body 211 and the base 212. A solid needle 32 is sequentially passed through the second microneedle channel 221 and the first microneedle channel 211a to achieve electrical connection with the circuit board 22 and conduction with the injection chamber 213. This design improves the integration of the structure, reduces the space occupied by the needle plate assembly 20, and facilitates the miniaturization of the treatment head. The base 212 and the main body 211 can be connected by threads, plugs, etc., and clamping the circuit board 22 between them improves assembly convenience and the stability of the circuit board 22. (Reference) Figure 2 It can be seen that the end of the hollow needle 31 that is away from the needle outlet 13 also passes through the second microneedle channel 221 and the first microneedle channel 211a in sequence, and finally connects with the injection chamber 213.
[0050] Combination Figure 1 As shown, in one embodiment of the present invention, a second sealing ring 50 is provided between the circuit board 22 and the base 212, and the circuit board 22 is sealed to the base 212 through the second sealing ring 50.
[0051] In this embodiment, the second sealing ring 50 is made of a highly elastic, chemically resistant material, such as fluororubber, which ensures good sealing performance under various environmental conditions. A groove is formed in the side of the base 212 facing the main body 211. The shape and size of the groove are adapted to the circuit board 22, which is embedded within the groove. The second sealing ring 50 is designed as an O-ring and is embedded within the groove. The O-ring can be located at the bottom of the groove or on the sidewall of the groove. The O-ring is pressed between the circuit board 22 and the groove of the base 212, thereby sealing the connection gap between the circuit board 22 and the base 212, improving the sealing effect between the circuit board 22 and the base 212, and preventing excess liquid in the mounting cavity 11 from seeping in through the gap between the circuit board 22 and the base 212, thus preventing a short circuit.
[0052] The second sealing ring 50 not only enhances the overall sealing of the treatment head but also improves the structural stability of the circuit board 22. Specifically, because the second sealing ring 50 has good elasticity and the circuit board 22 is clamped between the base 212 and the main body 211, the second sealing ring 50 can also act as a buffer, preventing the main body 211 and the base 212 from exerting excessive clamping force on the circuit board 22, which could lead to problems such as cracking of the circuit board 22.
[0053] Combination Figure 1 As shown, in one embodiment of the present invention, at least part of the space between the solid needle 32 and the inner wall of the second microneedle channel 221 is filled with sealant.
[0054] In this embodiment, since the second microneedle channel 221 is located on the circuit board 22, tin can be selected as the sealant. Tin has a low melting point and high bonding strength with metals. Therefore, liquid tin can be injected between the solid needle 32 and the inner wall of the second microneedle channel 221. After the tin solidifies, it seals the solid needle 32 and the circuit board 22. Alternatively, UV-curable adhesive can be selected as the sealant. Liquid sealant is injected between the solid needle 32 and the second microneedle channel 221, and then the sealant is cured by UV irradiation, sealing the solid needle 32 and the circuit board 22. The sealant prevents leakage of drugs or liquids and avoids the intrusion of external contaminants. The sealant can fill the entire second microneedle channel 221 or only fill the side of the second microneedle channel 221 near the needle outlet 13. This arrangement can block external contaminants from the outside of the circuit board 22 as much as possible. Since the hollow needle 31 is also inserted into the second microneedle channel 221, the sealant is also filled in the gap between the hollow needle 31 and the inner wall of the second microneedle channel 221 to prevent external contaminants from entering the circuit board 22.
[0055] Combination Figure 1As shown, in one embodiment of the present invention, a clearance hole 212a is provided in the center of the base 212, and a solid needle 32 passes through the clearance hole 212a and is sealed and connected to the circuit board 22.
[0056] In this embodiment, when assembling the needle plate assembly 20 and the microneedles 30, the microneedles 30 are first inserted into the main body 211 and the circuit board 22 in sequence, and then sealed and fixed to the circuit board 22 by electric welding or soldering. Next, the base support 212 is fitted onto the outside of the main body 211 and connected to it, thereby clamping and fixing the circuit board 22. The clearance hole 212a of the base support 212 is positioned opposite to the microneedles 30. Since the solid needles 31 and hollow needles 32 are arranged in an array on the circuit board 22, the clearance hole 212a can provide clearance for both the solid needles 31 and the hollow needles 32, improving the ease of assembly of the microneedles 30 and the needle plate assembly 20.
[0057] This utility model also proposes a treatment device, which includes a treatment handle and a treatment head. The specific structure of the treatment head is as described in the above embodiments. Since this treatment device adopts all the technical solutions of all the above embodiments of the treatment head, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0058] The treatment handpiece's outer shell is made of a lightweight, high-strength polymer material with a specially treated surface for excellent anti-slip properties. The handpiece integrates control circuitry and a power system to control the movement of the microneedles 30 and drug delivery. The control panel on the treatment handpiece integrates multiple buttons and a display screen to show current treatment parameters and the status of the microneedles 30.
[0059] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A treatment head, characterized in that, include: A housing having a mounting cavity, and a needle outlet communicating with the mounting cavity at one end of the housing; A needle plate assembly, which is movably disposed within the mounting cavity and is sealed to the inner wall of the housing; as well as A microneedle, including at least one hollow needle, is mounted on the needle plate assembly and extends out of the needle outlet under the drive of the needle plate assembly; The cavity wall of the mounting cavity is provided with a pressure relief port that communicates with the outside. The pressure relief port is located between the needle plate assembly and the needle outlet.
2. The treatment head as described in claim 1, characterized in that, The pressure relief port is provided in multiple locations, and the multiple pressure relief ports are arranged at intervals on the periphery of the housing.
3. The treatment head as described in any one of claims 1 or 2, characterized in that, The needle plate assembly includes a needle hub and a first sealing ring; The first sealing ring is sleeved on the outer periphery of the needle seat. The needle seat is tightly fitted with the inner wall of the mounting cavity through the first sealing ring. An injection cavity is formed inside the needle seat. A first microneedle channel is opened at one end of the needle seat facing the needle outlet. The end of the microneedle away from the needle outlet passes through the first microneedle channel and communicates with the injection cavity.
4. The treatment head as described in claim 3, characterized in that, A limiting groove is formed on the outer periphery of the needle holder, and the first sealing ring is partially embedded in the limiting groove.
5. The treatment head as described in claim 3, characterized in that, The needle plate assembly further includes a first sealant layer, which is disposed in the injection chamber and located on the side of the injection chamber near the needle outlet. The first sealant layer seals the gap between the microneedle and the inner wall of the first microneedle channel.
6. The treatment head as described in claim 3, characterized in that, The needle holder assembly also includes a circuit board, and the needle holder includes a body and a base; The main body has the injection cavity and the first microneedle channel. The base is detachably connected to the end of the main body facing the needle outlet. The outer periphery of the base is fitted with the first sealing ring. The circuit board is sandwiched between the main body and the base. The circuit board has a second microneedle channel. The microneedle also includes at least one solid needle. One end of the solid needle passes through the second microneedle channel and the first microneedle channel and is electrically connected to the circuit board.
7. The treatment head as described in claim 6, characterized in that, A second sealing ring is provided between the circuit board and the base, and the circuit board is sealed to the base through the second sealing ring.
8. The treatment head as described in claim 6, characterized in that, The space between the solid needle and the inner wall of the second microneedle channel is at least partially filled with sealant.
9. The treatment head as described in claim 6, characterized in that, The base has a clearance hole in the center, and the solid needle passes through the clearance hole and is sealed to the circuit board.
10. A treatment device, characterized in that, The treatment device includes a treatment handle and a treatment head as described in any one of claims 1 to 9.