Injection needle assembly, injection treatment head and injection treatment instrument

Abstract

The utility model discloses an injection needle assembly, an injection treatment head and an injection treatment instrument, and relates to the technical field of medical instruments, and the injection needle assembly comprises a needle seat, a needle cap and a plurality of hollow needles; a liquid injection cavity, a liquid injection opening communicated with the liquid injection cavity and a plurality of first needle holes are formed in the needle seat; the needle cap is arranged on the side, provided with the first needle holes, of the needle base and defines a bonding cavity with the needle base, and a plurality of second needle holes are formed in the surface of the needle cap. One end of each hollow needle penetrates through one second needle hole, the bonding cavity and one first needle hole and is communicated with the liquid injection cavity; wherein a bonding layer is arranged in the bonding cavity, and the bonding layer seals a gap between the hollow needle and the hole wall of the first needle hole. According to the injection needle assembly, the problem that treatment liquid is prone to seeping out of an existing injection treatment head is solved, and the sealing performance of the injection needle assembly is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an injection needle assembly, an injection treatment head, and an injection treatment device. Background Technology

[0002] Injection treatment heads deliver therapeutic solutions into the skin to achieve effects such as whitening and brightening, improving skin elasticity, and reducing wrinkles, making them increasingly popular among young women. Existing injection treatment heads consist of a needle hub and microneedles mounted on the hub. The hub contains therapeutic solution channels and needle holes, while the microneedles contain microneedle channels. One end of the microneedle passes through the needle hole and connects to the therapeutic solution channels. When the microneedles pierce the skin, the therapeutic solution is injected into the skin through the therapeutic solution channels and microneedle channels.

[0003] In the prior art, in order to facilitate the assembly of microneedles and needle hubs, the diameter of the needle hole is usually designed to be larger than the diameter of the microneedle. However, the gap between the microneedle and the inner wall of the needle hole will affect the sealing effect of the treatment fluid channel. During the injection of treatment fluid, the treatment fluid is easy to seep out from the gap between the microneedle and the inner wall of the needle hole, resulting in contamination of the treatment head and skin, which affects the user's experience. Utility Model Content

[0004] The main purpose of this invention is to provide an injection needle assembly, an injection treatment head, and an injection treatment device, which aims to solve the problem of poor sealing between the microneedle and the needle seat in existing injection needle assemblies, which easily leads to leakage of treatment fluid.

[0005] To achieve the above objectives, the present invention proposes an injection needle assembly, which includes a needle hub, a needle cap, and a plurality of hollow needles; the needle hub forms an injection cavity, and an injection port and a plurality of first needle holes communicating with the injection cavity; the needle cap is disposed on the side of the needle hub where the first needle holes are opened, and surrounds the needle hub to form an adhesive cavity, and the surface of the needle cap has a plurality of second needle holes; one end of each hollow needle passes through a second needle hole, the adhesive cavity, and a first needle hole, and communicates with the injection cavity;

[0006] The adhesive cavity contains an adhesive layer that seals the gap between the hollow needle and the wall of the first needle hole.

[0007] In one embodiment of this utility model, the needle seat has an injection port that communicates with the adhesive cavity. The injection port is used to inject adhesive into the adhesive cavity and form the adhesive layer.

[0008] In one embodiment of this utility model, the needle seat is further provided with an exhaust port, the glue injection port and the exhaust port are spaced apart, and the exhaust port is connected to the adhesive cavity.

[0009] In one embodiment of this utility model, the needle holder includes a needle plate and a sealing member. One side of the needle plate and the needle cap form the adhesive cavity, and the other side is recessed to form a groove. The sealing member covers the other side of the needle plate and surrounds the groove to form the injection cavity. The sealing member is sealed to the periphery of the needle plate. The bottom of the groove is provided with the glue injection port and the vent port. The bottom of the groove is provided with a plurality of first needle holes.

[0010] In one embodiment of the present invention, the wall of the injection chamber is formed with a flow channel, which includes a main flow channel, a number of secondary flow channels and a number of tertiary flow channels connected in sequence.

[0011] The main flow channel is located in the middle of the seal and communicates with the injection port; the secondary flow channel and the tertiary flow channel are located in the seal.

[0012] Several of the secondary flow channels are arranged circumferentially around the main flow channel with equal lengths;

[0013] The multiple tertiary channels are arranged circumferentially with equal lengths around the ends of the multiple secondary channels;

[0014] The multiple three-stage flow channels are connected to the multiple hollow needles in a one-to-one correspondence.

[0015] In one embodiment of this utility model, the plurality of tertiary channels surround the ends of the plurality of secondary channels to form a plurality of T-shaped channels, and each of the secondary channels is connected to the center of each of the T-shaped channels.

[0016] In one embodiment of the present invention, a sealing groove is provided on the side of the needle plate facing the sealing member, and a sealing block is protruding on the side of the sealing member facing the needle plate. The sealing groove and the sealing block are both arranged around the outer periphery of the injection cavity. The sealing groove is filled with sealant to form a sealing layer, and the sealing block is at least partially inserted into the sealing layer.

[0017] In one embodiment of this utility model, the sealing member has a plurality of limiting blocks protruding toward the injection cavity, and the plurality of limiting blocks are embedded in the injection cavity and are in clearance fit with the needle plate, with each limiting block located between two adjacent hollow needles.

[0018] In one embodiment of this utility model, the first pinhole and / or the second pinhole are tapered holes, with the larger side of the tapered hole facing the adhesive cavity.

[0019] In one embodiment of this utility model, the hollow needle has a slanted cut at one end that connects to the injection cavity.

[0020] This utility model also proposes an injection treatment head, which includes a shell, an injection tube, and an injection needle assembly as described above; one end of the shell is a treatment end, and a third needle hole is opened on the end face of the treatment end; the injection needle assembly is installed in the shell; one end of the hollow needle away from the needle seat is inserted into the third needle hole; the injection tube is located in the shell, and one end is connected to the injection port, and the other end is used to connect to an external injection device.

[0021] In one embodiment of this utility model, the injection treatment head further includes a spring, a drive shaft is provided at the end of the needle seat opposite to the needle cap, a pressure cap is connected to the end of the drive shaft opposite to the needle seat, the drive shaft is used to drive the hollow needle through the third needle hole, the spring is sleeved on the outer periphery of the drive shaft, one end of the spring is connected to the outer shell, and the other end is connected to the pressure cap, when the drive shaft drives the hollow needle through the third needle hole, the drive shaft compresses the spring;

[0022] And / or, a sealing ring is provided around the outer periphery of the needle cap or the needle seat, and the sealing ring is interference-fitted with the inner wall of the outer shell.

[0023] This utility model also proposes an injection therapy device, which includes an injection device and an injection head as described above; the injection device is connected to the injection tube.

[0024] The injection needle assembly proposed in this utility model includes a needle hub, a needle cap, and multiple hollow needles. The needle hub forms an injection cavity, and its surface has an injection port communicating with the injection cavity and multiple first needle holes. The needle cap is placed on the side of the needle hub with the first needle holes, and the needle cap and needle hub enclose an adhesive cavity. Multiple second needle holes corresponding to the first needle holes are also formed on the surface of the needle cap. One end of each hollow needle is sequentially passed through the second needle holes, the adhesive cavity, and the first needle holes, communicating with the injection cavity. Simultaneously, adhesive is injected into the adhesive cavity to form an adhesive layer. The adhesive layer seals the gap between the hollow needle and the walls of the first and / or second needle holes. Therefore, during the injection of therapeutic fluid, the adhesive layer can prevent the therapeutic fluid from flowing out of the injection cavity to the outside of the injection needle assembly, solving the problem of therapeutic fluid leakage in existing injection heads and improving the sealing performance of the injection needle assembly. Attached Figure Description

[0025] 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.

[0026] Figure 1 A cross-sectional view of the injection needle assembly provided by this utility model from one perspective;

[0027] Figure 2 A cross-sectional view of the injection needle assembly provided by this utility model from another perspective;

[0028] Figure 3 Another cross-sectional view of the injection needle assembly provided by this utility model;

[0029] Figure 4 A cross-sectional view of the injection needle treatment head provided by this utility model;

[0030] Figure 5 This is a schematic diagram of the sealing element in the injection needle assembly provided by this utility model;

[0031] Figure 6 for Figure 5 Top view of the seal;

[0032] Figure 7 This is a top view of the needle plate in the injection needle assembly provided by this utility model.

[0033] Explanation of icon numbers:

[0034] 10. Needle base; 11. Seal; 111. Sealing block; 112. Limiting block; 113. Boss; 114. Flow guide channel; 114a. Main flow channel; 114b. Secondary flow channel; 114c. Tertiary flow channel; 12. Needle plate; 12a. Groove; 121. Sealing groove; 122. Injection port; 123. Exhaust port; 125. Flow guide groove; 13. Injection chamber; 14. Injection port; 15. First needle hole; 20. Needle cap; 21. Adhesive cavity; 22. Second needle hole; 30. Hollow needle; 40. Injection tube; 50. Outer shell; 51. Third needle hole; 60. Drive shaft; 61. Pressure cap; 70. Spring; 80. Sealing ring.

[0035] 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

[0036] 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.

[0037] 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.

[0038] 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.

[0039] This utility model proposes an injection needle assembly.

[0040] Combination Figure 1 and Figure 2 As shown, in one embodiment of this utility model, the injection needle assembly includes a needle base 10, a needle cap 20, and a plurality of hollow needles 30; the needle base 10 forms an injection cavity 13, and an injection port 14 communicating with the injection cavity 13 and a plurality of hollow needles 30; the needle cap 20 is disposed on the side of the needle base 10 where a first needle hole 15 is opened, and surrounds the needle base 10 to form an adhesive cavity 21, and a plurality of second needle holes 22 are opened on the surface of the needle cap 20; one end of each hollow needle 30 passes through a second needle hole 22, an adhesive cavity 21, and a first needle hole 15, and communicates with the injection cavity 13; wherein, an adhesive layer is provided in the adhesive cavity 21, the adhesive layer seals the gap between the hollow needle 30 and the hole wall of the first needle hole 15, and fixes the hollow needle 30.

[0041] In this embodiment, the needle hub 10 and needle cap 20 are made of materials with good strength and biocompatibility, such as medical-grade plastics or alloys. This material selection not only ensures structural strength but also reduces potential irritation to human tissues. The first needle hole 15 and the second needle hole 22 respectively opened on the needle hub 10 and needle cap 20 serve to guide and limit the hollow needle 30, thereby improving the convenience and stability of the hollow needle 30 during installation and movement. The hollow needle 30 itself is made of a corrosion-resistant metal material with moderate hardness, such as stainless steel or other metal materials suitable for medical applications, ensuring that it is not easily deformed or damaged during long-term use.

[0042] The adhesive layer within the adhesive cavity 21 plays a crucial sealing role. This adhesive layer is formed by curing a medical-grade adhesive, including but not limited to epoxy resin, cyanoacrylate (instant adhesive), and silicone sealant. These materials all possess good biocompatibility and chemical stability, making them suitable for medical environments. After being injected into the adhesive cavity 21, the fluid adhesive fills the minute gaps between the hollow needle 30 and the walls of the first needle hole 15 and / or the second needle hole 22. The adhesive then rapidly cures under certain conditions (e.g., heating, ultraviolet light irradiation) to form the adhesive layer. This adhesive layer effectively seals the minute gaps between the hollow needle 30 and the walls of the first needle hole 15 and / or the second needle hole 22, preventing the treatment fluid from leaking from the injection cavity 13 to the outside of the injection needle assembly. This improves the user's treatment experience and reduces contamination and discomfort caused by fluid leakage.

[0043] Furthermore, the adhesive cavity 21 in this application is formed by the needle cap 20 and the needle seat 10. Specifically, a groove 12a can be opened on one side of the needle cap 20 or the needle seat 10, and the needle seat 10 and the needle cap 20 can be fitted together and the groove 12a can be sealed to form the adhesive cavity 21. Therefore, when a certain fluid adhesive is injected into the adhesive cavity 21, the needle seat 10 and the needle cap 20 can effectively prevent the adhesive from flowing out to the outside of the adhesive cavity 21, thereby improving the convenience of adhesive layer formation. At the same time, after the adhesive layer is formed, the adhesive layer can seal the gap between the hollow needle 30 and the hole walls of the first needle hole 15 and the second needle hole 22, that is, a two-stage sealing structure is formed, which further improves the anti-leakage effect of the treatment fluid in the injection cavity 13.

[0044] The needle holder 10 and the needle cap 20 are detachably connected and can be fixed by threads, snap-fit, or other connection methods. Alternatively, the needle holder 10 and the needle cap 20 can be snapped together and then bonded together by a cured adhesive layer, thereby improving assembly efficiency and structural connection strength.

[0045] Combination Figure 1 As shown, in one embodiment of this utility model, the needle holder 10 has an injection port 122, which is connected to the adhesive cavity 21. The injection port 122 is used to inject adhesive into the adhesive cavity 21 and form an adhesive layer.

[0046] In this embodiment, the needle holder 10 is provided with an injection port 122 communicating with the adhesive cavity 21, so that the adhesive can be injected and fill the adhesive cavity 21. The design of the injection port 122 improves the convenience of adhesive injection operation. The injection port 122 can adopt different types of interfaces, such as threaded connections or quick couplings, so as to be compatible with different dispensing equipment and improve production flexibility.

[0047] The injection port 122 is located on the side of the needle seat 10 away from the needle cap 20. Therefore, when injecting adhesive, the needle seat 10 can be facing upwards and the needle cap 20 downwards to avoid adhesive overflow or uneven distribution. In other embodiments, the injection port 122 can also be located on the needle cap 20.

[0048] Combination Figure 1 As shown, in one embodiment of this utility model, the needle holder 10 is also provided with an exhaust port 123, the glue injection port 122 and the exhaust port 123 are spaced apart, and the exhaust port 123 is connected to the adhesive cavity 21.

[0049] In this embodiment, the main function of the vent 123 is to expel air from the adhesive cavity 21 during the adhesive injection process, preventing air bubbles from remaining and ensuring the uniformity and sealing effect of the adhesive layer. This allows the adhesive to be effectively injected and filled into the areas requiring sealing, ensuring that the gaps between each hollow needle 30 and the first needle hole 15 and the second needle hole 22 are fully filled. The vent 123 is spaced apart from the glue injection port 122, such as... Figure 1 As shown, the glue injection port 122 and the vent port 123 are located at opposite corners of the adhesive cavity 21, which further facilitates the discharge of gas in the adhesive cavity 21.

[0050] Combination Figure 1 As shown, in one embodiment of the present invention, the needle holder 10 includes a needle plate 12 and a sealing member 11. One side of the needle plate 12 is enclosed with the needle cap 20 to form an adhesive cavity 21, and the other side is recessed to form a groove 12a. The sealing member 11 is covered on the other side of the needle plate 12 and encloses the groove 12a to form an injection cavity 13. The sealing member 11 is sealed to the periphery of the needle plate 12. The bottom of the groove 12a is provided with an injection port 122 and an exhaust port 123. The bottom of the groove 12a is provided with a plurality of first needle holes 15.

[0051] In this embodiment, the needle plate 12 serves as the main support structure. One side of the plate 12 mates with the needle cap 20 to form an adhesive cavity 21, which is used to accommodate the hollow needles 30 and inject adhesive. The other side has a groove 12a, which is used to install the sealing element 11 and form an injection cavity 13. The injection cavity 13 is the main storage area for the treatment fluid. It is connected to an external injection device through the injection port 14 to ensure that the treatment fluid can smoothly enter each hollow needle 30 and finally be injected into the skin.

[0052] The sealing element 11 is made of a material with good elasticity and sealing properties, such as medical-grade silicone or rubber, to ensure a tight and leak-free seal between it and the needle plate 12. Alternatively, the sealing element 11 can be made of a rigid material, with an elastic sealing material placed between the sealing element 11 and the needle plate 12, achieving a sealed connection between them. The sealing element 11 covers the groove 12a of the needle plate 12, and together they form a closed injection chamber 13, preventing the treatment fluid from leaking out from other areas.

[0053] In addition, the injection chamber 13 is configured as a structure formed by the needle plate 12 and the sealing element 11. Compared with the needle seat 10, which is formed by an integral molding process, this embodiment makes the processing and assembly of the needle seat 10 structure simpler through the design of the needle plate 12 and the sealing element 11.

[0054] During assembly, the needle cap 20 is first aligned and fixed with the needle plate 12 to form an adhesive cavity 21. Then, hollow needles 30 are sequentially passed through the second needle hole 22 on the needle cap 20, the adhesive cavity 21, and the first needle hole 15 on the needle plate 12, ensuring that each hollow needle 30 is accurately installed. Next, a special medical-grade adhesive is injected through the injection port 122. As the adhesive is injected, air is gradually expelled through the vent port 123, ensuring that the adhesive layer is evenly distributed and free of air bubbles. At this point, the adhesive layer fixes the hollow needles 30 to the needle plate 12 and the needle cap 20. Then, the sealing member 11 is installed into the groove 12a of the needle plate 12 and sealed to form an injection cavity 13. Finally, the treatment fluid is injected into the injection cavity 13 through the injection port 14, and injection treatment can then be performed.

[0055] The bottom of groove 12a has an injection port 122 and an vent 123. These two ports are used to inject adhesive and vent air, respectively, to ensure uniform filling of the adhesive layer and to remove air bubbles. Figure 1 As shown, the glue injection port 122 and the vent port 123 are located at two opposite corners of the rectangular groove 12a, so as to facilitate the discharge of gas from the adhesive cavity 21.

[0056] Combination Figure 1 As shown, in one embodiment of the present invention, a sealing groove 121 is provided on the side of the needle plate 12 facing the sealing member 11, and a sealing block 111 is provided on the side of the sealing member 11 facing the needle plate 12. The sealing groove 121 and the sealing block 111 are both arranged around the outer periphery of the injection cavity 13. The sealing groove 121 is filled with sealant and forms a sealing layer. The sealing block 111 is at least partially inserted into the sealing layer.

[0057] In this embodiment, the design of the sealing groove 121 not only provides storage space for the sealant, but also forms a sealing structure with a certain depth through its cooperation with the sealing block 111. The sealant is a medical-grade material with good biocompatibility and chemical stability, such as silicone sealant or epoxy resin, which can cure rapidly under certain conditions to form a tight and leak-free sealing layer.

[0058] The sealing block 111 protrudes from the side of the sealing element 11 facing the needle plate 12, and its shape and size match the sealing groove 121. When the sealing block 111 is partially inserted into the sealant, the sealant, after curing, tightly wraps around the sealing block 111, thus forming a more stable sealing structure. This design not only prevents liquid from leaking from the injection chamber 13, but also enhances the stability of the overall structure and reduces the risk of leakage due to changes in external pressure. Both the sealing groove 121 and the sealing block 111 are arranged around the outer periphery of the injection chamber 13, ensuring that the entire injection chamber 13 is effectively sealed.

[0059] Combination Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the sealing member 11 is provided with a plurality of limiting blocks 112 protruding toward the injection cavity 13. The plurality of limiting blocks 112 are all embedded in the injection cavity 13 and are in clearance fit with the needle plate 12. Each limiting block 112 is located between two adjacent hollow needles 30.

[0060] In this embodiment, the limiting block 112 reduces the volume of the injection cavity 13 between two adjacent hollow needles 30, thereby reducing residual treatment fluid during injection and minimizing waste. Simultaneously, the hollow needle 30 is positioned between two adjacent limiting blocks 112, allowing the protruding limiting blocks 112 to avoid obstructing the hollow needle 30, ensuring sufficient space above the hollow needle 30 for smooth injection. The number, shape, and size of the limiting blocks 112 are determined by the arrangement of the multiple hollow needles 30 to ensure that the limiting blocks 112 can be embedded within the injection cavity 13 and maintain an appropriate clearance fit with the needle plate 12. For example... Figure 1 As shown, multiple hollow needles 30 are arranged in a matrix, and the limiting block 112 is set in a long strip shape and located between two adjacent columns of hollow needles 30; of course, the limiting block 112 can also be set in a grid shape and distributed alternately between the rows and columns of the hollow needle matrix 30.

[0061] Combination Figures 1 to 3 As shown, in one embodiment of this utility model, the first pinhole 15 and / or the second pinhole 22 are tapered holes, with the side of the tapered hole with the larger opening facing the adhesive cavity 21.

[0062] In this embodiment, both the first needle hole 15 on the needle holder 10 and the second needle hole 22 on the needle cap 20 are designed as tapered holes, meaning the diameter of the hole gradually decreases from one end to the other, with the side with the larger opening facing the adhesive cavity 21. During installation, the hollow needle 30 can be inserted at one end into the second needle hole 22 of the needle cap 20, and then the other end into the second needle hole 22 of the needle holder 10, and finally the needle cap 20 and needle holder 10 are fastened together. The tapered hole design allows for smoother insertion of the hollow needle 30 into the needle cap 20 and needle holder 10. The tapered hole provides a guiding function, simplifies the installation process of the hollow needle 30, reduces operational difficulty, and improves the sealing between the hollow needle 30 and the needle hole through the gradually decreasing hole diameter.

[0063] In addition, the side with the larger opening of the conical hole is positioned towards the adhesive cavity 21 so that after the adhesive is filled into the adhesive cavity 21, it can easily fill the conical hole, so that the adhesive can fill the gap between the hollow needle 30 and the hole walls of the first needle hole 15 and the second needle hole 22, thereby improving the sealing effect of the adhesive layer.

[0064] In one embodiment of this utility model, the hollow needle 30 has a bevel at one end that connects to the injection cavity 13. The longitudinal cross-sectional shape of the end of the hollow needle 30 can be triangular, trapezoidal, etc. By setting a bevel at the end of the hollow needle 30, the inlet diameter of the hollow needle 30 is increased after the hollow needle 30 is inserted into the injection cavity 13, which facilitates the flow of liquid. Even if the end of the hollow needle 30 abuts against the sealing member 11, the unobstructed flow between the hollow needle 30 and the injection cavity 13 can be maintained, thereby ensuring the effect of injection treatment.

[0065] Combination Figures 5 to 7 As shown, in one embodiment of this utility model, the cavity wall of the injection chamber 13 is formed with a flow guiding channel 114, which includes a main flow channel 114a, a plurality of secondary flow channels 114b, and a plurality of tertiary flow channels 114c connected in sequence; the main flow channel 114a is located in the middle of the sealing member 11 and is connected to the injection port 14; the secondary flow channels 114b and the tertiary flow channels 114c are located in the sealing member 11, and the plurality of secondary flow channels 114b are arranged circumferentially with equal lengths around the end of the main flow channel 114a; the plurality of tertiary flow channels 114c are arranged circumferentially with equal lengths around the end of the plurality of secondary flow channels 114b; the plurality of tertiary flow channels 114c are connected to a plurality of hollow needles 30 in a one-to-one correspondence.

[0066] Specifically, the cavity wall of the injection chamber 13 has a flow channel 114, such as... Figures 5 to 7As shown, the flow channel 114 includes a main flow channel 114a, several secondary flow channels 114b, and several tertiary flow channels 114c connected in sequence. The main flow channel 114a is located in the middle of the seal 11 and is connected to the injection port 14. The treatment fluid injected into the injection port 14 enters the opening of the hollow needle 30 through the main flow channel 114a, the secondary flow channels 114b, and the tertiary flow channels 114c in sequence. Since the several secondary flow channels 114b surround the end of the main flow channel 114a with equal lengths... The treatment fluid is arranged circumferentially; multiple tertiary channels 114c are arranged circumferentially around the ends of several secondary channels 114b with equal lengths, so that the treatment fluid flowing out from the main channel 114a flows along several secondary channels 114b with equal lengths and multiple tertiary channels 114c with equal lengths, and then flows into the opening of each hollow needle 30 with equal distances, so that when the treatment fluid is injected from the injection port 14, the injection time into each hollow needle 30 is the same or similar.

[0067] It should be noted that the multiple tertiary flow channels 114c surround the ends of the multiple secondary flow channels 114b to form multiple T-shaped flow channels, and each secondary flow channel 114b is connected to the center of each T-shaped flow channel. The multiple secondary flow channels 114b and the multiple tertiary flow channels 114c can be straight flow channels or curved flow channels with equal lengths, and the specific flow channel shape is not limited here.

[0068] In other embodiments, a plurality of secondary channels 114b are configured to have equal cross-sectional areas and a plurality of tertiary channels 114c are configured to have equal cross-sectional areas, further such that the amount of therapeutic fluid injected into each hollow needle 30 from the injection port 14 is the same or similar.

[0069] Furthermore, a boss 113 is provided on the side of the seal 11 facing the needle plate 12. Secondary flow channels 114b and tertiary flow channels 114c are formed on the surface of the boss 113. A groove 12a is recessed on the side of the needle plate 12 facing the seal 11, and the groove 12a is adapted to the boss 113. A guide groove 125 is formed at the bottom of the groove 12a. The guide groove 125 is correspondingly arranged with the secondary flow channel 114b and the tertiary flow channel 114c to form a closed flow channel. When the seal 11 and the needle plate 12 are assembled, the boss 113 is embedded in the groove 12a. At this time, the guide channel 114b and the guide groove 125 enclose and form an injection path for the flow of treatment fluid. Hollow needles 30 are inserted into needle plate 12 and connected to guide channels 125. They are used to guide the treatment fluid flowing in from injection port 14 into multiple hollow needles 30 through multiple guide channels 125 of the same length (forming multiple closed spaces with several secondary channels 114b of equal length and multiple tertiary channels 114c of equal length), thereby further improving the uniformity of injection treatment.

[0070] This utility model also proposes an injection treatment head, which includes a shell 50, an injection tube 40, and an injection needle assembly. The specific structure of the injection needle assembly is as described in the above embodiments. Since this injection treatment head adopts all the technical solutions of all the above embodiments of the injection needle assembly, 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.

[0071] Among them, combined Figure 4 As shown, in one embodiment of this utility model, one end of the outer shell 50 is a treatment end, and a third needle hole 51 is provided on the end face of the treatment end. The injection needle assembly is installed inside the outer shell 50, and the hollow needle 30 is inserted into the third needle hole 51 at one end away from the needle seat 10. The injection tube 40 is provided inside the outer shell 50, and one end is connected to the injection port 14, while the other end is used to connect to an external injection device.

[0072] In this embodiment, the injection treatment head consists of three parts: a housing 50, an injection tube 40, and an injection needle assembly. The housing 50 serves as the main protective structure of the entire treatment head, ensuring the stability and safety of each component during use. One end of the housing 50 is the treatment end, and this end face has a third needle hole 51 for the hollow needle 30 to pass through and pierce the skin.

[0073] The injection tube 40 is a component that connects the injection needle assembly to the external injection device. One end of the injection tube 40 is tightly connected to the injection port 14 of the injection needle assembly to ensure that the treatment fluid can smoothly enter the injection needle assembly; the other end extends to the outside of the outer casing 50 for connecting to the external injection device. This design ensures the smooth flow of treatment fluid from the external device to the hollow needle 30 and facilitates the matching of the injection head with injection devices of different sizes.

[0074] By improving the structure of the injection needle assembly, the sealing effect of the injection needle assembly is improved, preventing the treatment fluid from leaking from the injection chamber 13 to the outside of the injection needle assembly, thereby improving the cleanliness of the injection treatment head and the user experience.

[0075] Combination Figure 4 As shown, in one embodiment of this utility model, the injection treatment head further includes a spring 70. The end of the needle seat 10 away from the needle cap 20 is provided with a drive shaft 60. The end of the drive shaft 60 away from the needle seat 10 is connected to a pressure cap 61. The drive shaft 60 is used to drive the hollow needle 30 through the third needle hole 51. The spring 70 is sleeved on the outer periphery of the drive shaft 60. One end of the spring 70 is connected to the outer shell 50, and the other end is connected to the pressure cap 61. When the drive shaft 60 drives the hollow needle 30 through the third needle hole 51, the drive shaft 60 compresses the spring 70.

[0076] And / or, a sealing ring 80 is provided around the outer periphery of the needle cap 20 or the needle seat 10, and the sealing ring 80 is interference-fitted with the inner wall of the outer shell 50.

[0077] In this embodiment, the drive shaft 60 is used to drive the hollow needle 30 through the third needle hole 51. The drive shaft 60 can be connected to the drive motor by means of threaded connection, snap-fit, etc., to drive the hollow needle 30 to move. The pressure cap 61 can be connected to the end of the drive shaft 60 by means of threaded connection, plug-in, etc., and the cross-sectional dimension of the pressure cap 61 is larger than that of the drive shaft 60. Therefore, the spring 70 is sleeved on the outer periphery of the drive shaft 60. One end of the spring 70 is connected to the outer shell 50, and the other end abuts against the pressure cap 61. Specifically, the outer shell 50 includes a shell and a cover plate. The cover plate covers one end of the shell and has an installation opening. One end of the drive shaft 60 is disposed inside the shell, and the other end passes through the installation opening. One end of the spring 70 abuts against the cover plate. When the drive shaft 60 pushes the hollow needle 30 through the third needle hole 51, the drive shaft 60 will compress the spring 70, thereby providing elastic restoring force for the driving process, so that the hollow needle 30 can retract into the housing 50 after the driving force is removed, so as to avoid the exposed hollow needle 30 being bumped or accidentally injuring the user.

[0078] With or without limitation including the spring 70 in the injection treatment head, a sealing ring 80 is provided around the outer periphery of the needle cap 20 or needle seat 10 to further improve sealing performance. The sealing ring 80 effectively prevents the treatment fluid from leaking from the gap between the injection needle assembly and the housing 50, and prevents external moisture and dust from seeping into the interior of the housing 50 through the third needle hole 51, thus enhancing the overall sealing performance of the injection treatment head. The sealing ring 80 is made of a material with good elasticity and chemical resistance, such as medical-grade silicone or rubber, to ensure that it maintains a good sealing effect during long-term use.

[0079] This utility model also proposes an injection therapy device, which includes an injection device and an injection treatment head. The specific structure of the injection treatment head is as described in the above embodiments. Since this injection therapy device adopts all the technical solutions of all the above embodiments of the injection 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.

[0080] The injection therapy device includes an injection device and an injection head as described above; the injection device is connected to the injection tube 40.

[0081] In this embodiment, the injection device serves as the main supply source of the treatment solution, responsible for storing and delivering the treatment solution. It includes a liquid container and a pumping mechanism to ensure the treatment solution is delivered into the injection head. The injection head comprises a housing 50, an injection tube 40, and an injection needle assembly, with the specific structure described in the preceding claims. It is used to precisely inject the treatment solution into the skin via a hollow needle 30.

[0082] The injection device is directly connected to the injection tube 40 inside the injection treatment head, forming a fluid transmission path. One end of the injection tube 40 is connected to the output port of the injection device, and the other end is tightly connected to the injection port 14 of the injection needle assembly, ensuring that the treatment fluid can smoothly enter the injection needle assembly and be evenly injected into the skin through each hollow needle 30.

[0083] 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. An injection needle assembly, characterized in that, The injection needle assembly includes: A needle hub, wherein the needle hub has an injection cavity, an injection port communicating with the injection cavity, and a plurality of first needle holes; A needle cap, wherein the needle cap is disposed on the side of the needle holder where the first needle hole is opened, and forms an adhesive cavity with the needle holder; the surface of the needle cap has a plurality of second needle holes; and Multiple hollow needles, one end of each hollow needle passing through a second needle hole, the adhesive cavity and a first needle hole, and connected to the injection cavity; The adhesive cavity is provided with an adhesive layer, which seals the gap between the hollow needle and the hole wall of the first needle hole and / or the second needle hole.

2. The injection needle assembly as claimed in claim 1, characterized in that, The needle hub has an injection port that connects to the adhesive cavity. The injection port is used to inject adhesive into the adhesive cavity and form the adhesive layer.

3. The injection needle assembly as described in claim 2, characterized in that, The needle holder is also provided with an exhaust port, the glue injection port and the exhaust port are spaced apart, and the exhaust port is connected to the adhesive cavity.

4. The injection needle assembly as described in claim 3, characterized in that, The needle holder includes a needle plate and a sealing element. One side of the needle plate and the needle cap form the adhesive cavity, and the other side is recessed to form a groove. The sealing element covers the other side of the needle plate and surrounds the groove to form the injection cavity. The sealing element is sealed to the periphery of the needle plate. The bottom of the groove has the glue injection port and the vent port. The bottom of the groove has a plurality of first needle holes.

5. The injection needle assembly as claimed in claim 4, characterized in that, The wall of the injection chamber is formed with a flow channel, which includes a main flow channel, several secondary flow channels and multiple tertiary flow channels connected in sequence. The main flow channel is located in the middle of the seal and communicates with the injection port; the secondary flow channel and the tertiary flow channel are located in the seal. Several of the secondary flow channels are arranged circumferentially around the main flow channel with equal lengths; Multiple tertiary flow channels are arranged circumferentially with equal lengths around the ends of several secondary flow channels; the multiple tertiary flow channels are connected to multiple hollow needles in a one-to-one correspondence.

6. The injection needle assembly as claimed in claim 5, characterized in that, The multiple tertiary channels surround the ends of the multiple secondary channels to form multiple T-shaped channels, and each of the secondary channels is connected to the center of each of the T-shaped channels.

7. The injection needle assembly as claimed in claim 4, characterized in that, The needle plate has a sealing groove on the side facing the seal, and the seal has a sealing block protruding on the side facing the needle plate. The sealing groove and the sealing block are both arranged around the outer periphery of the injection cavity. The sealing groove is filled with sealant to form a sealing layer, and the sealing block is at least partially inserted into the sealing layer.

8. The injection needle assembly as claimed in claim 4, characterized in that, The sealing element has multiple limiting blocks protruding towards the injection cavity. The multiple limiting blocks are embedded in the injection cavity and are in clearance fit with the needle plate. Each limiting block is located between two adjacent hollow needles.

9. The injection needle assembly as described in any one of claims 1 to 8, characterized in that, The first pinhole and / or the second pinhole are tapered holes, with the larger side of the tapered hole facing the adhesive cavity.

10. The injection needle assembly as claimed in any one of claims 1 to 8, characterized in that, The hollow needle has a slanted cut at one end that connects to the injection cavity.

11. An injection treatment head, characterized in that, The injection treatment head includes a housing, an injection tube, and an injection needle assembly as described in any one of claims 1 to 10; One end of the outer shell is the treatment end, and a third needle hole is provided on the end face of the treatment end. The injection needle assembly is installed inside the outer shell. The end of the hollow needle facing away from the needle seat is inserted into the third needle hole. The injection tube is located inside the outer shell, with one end connected to the injection port and the other end used to connect to an external injection device.

12. The injection treatment head as described in claim 11, characterized in that, The injection treatment head also includes a spring. The end of the needle seat opposite to the needle cap is provided with a drive shaft. The end of the drive shaft opposite to the needle seat is connected to a pressure cap. The drive shaft is used to drive the hollow needle through the third needle hole. The spring is sleeved on the outer periphery of the drive shaft. One end of the spring is connected to the outer shell and the other end is connected to the pressure cap. When the drive shaft drives the hollow needle through the third needle hole, the drive shaft compresses the spring. And / or, a sealing ring is provided around the outer periphery of the needle cap or the needle seat, and the sealing ring is interference-fitted with the inner wall of the outer shell.

13. An injection therapy device, characterized in that, The injection therapy device includes an injection device and an injection head as described in claim 11 or 12; the injection device is connected to the injection tube.

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