Injection needle assembly, injection needle treatment head and treatment device

Abstract

The utility model discloses an injection needle assembly, injection needle treatment head and treatment device relate to medical instrument technical field, wherein, injection needle assembly includes needle seat, connecting piece and fixed sleeve, the needle seat has and connects the end, the outer circumferential surface of needle seat is equipped with interface, the outer circumferential surface is located between the end surface of injection end and the end surface of connecting end, one end of connecting piece is equipped in interface, and with needle seat connects, the other end of connecting piece communicates with the liquid storage cavity of injection needle pipe, the fixed sleeve is slidably equipped in connecting piece, and is used for the radial compression of the sleeve joint place of connecting piece with interface, to with interface on connecting piece fixed, fixed sleeve with needle seat connects. The utility model provides technical scheme, to solve the problem of the injection needle assembly internal space occupation too much, needle seat movement stroke is limited and assembly complex in prior art because interface extends along needle seat axial direction.

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 needle treatment head, and a treatment device. Background Technology

[0002] In the field of medical injection devices, a reliable connection between the injection needle and the needle hub is a core technological aspect ensuring the safe delivery of medication. In related technologies, a typical sealing and fixing structure includes an interface, a tubing, and a fixing sleeve. The interface is formed on the base and protrudes along the axial direction of the base. External threads and internal threads are respectively provided on the outer peripheral wall of the interface and the inner peripheral wall of the fixing sleeve. The fixing sleeve covers the interface in a parallel sleeve manner, achieving the connection between the interface and the fixing sleeve. Finally, bolts are used to connect the fixing sleeve to the base.

[0003] However, the above-mentioned sealing and fixing structure is not suitable for syringes. Since syringes are small-volume precision instruments with compact internal cavity structures, the needle hub needs to move axially to complete the injection action. The traditional axially extended interface design requires additional axial space, which restricts the movement stroke of the needle hub. Furthermore, the sleeve connection operation requires a pre-reserved assembly allowance in the axial direction of the needle hub, which contradicts the trend of syringe miniaturization design. Utility Model Content

[0004] The main purpose of this invention is to propose an injection needle assembly that aims to solve the problems in the prior art, such as excessive internal space occupation, limited needle holder movement stroke, and complex assembly caused by the interface extending along the needle seat axial direction.

[0005] To achieve the above objectives, the present invention provides an injection needle assembly comprising:

[0006] A needle hub, having an injection end and a connecting end, wherein an interface is provided on the outer peripheral surface of the needle hub, the outer peripheral surface being located between the end face of the injection end and the end face of the connecting end; and

[0007] A connector, one end of which is fitted onto the interface, and the other end of which is connected to the liquid reservoir of the injection needle tube;

[0008] A fixing sleeve is slidably fitted onto the connector and used to radially compress the connection between the connector and the interface to fix the connector onto the interface. The fixing sleeve is connected to the pin seat.

[0009] In one embodiment, the injection needle assembly includes a fastener, the fixing sleeve has a connecting portion, the connecting portion is disposed at the connecting end, and the surface of the connecting portion and the surface of the interface are opposite to each other. The fastener passes through the end faces of the connecting portion and the connecting end to connect the fixing sleeve and the needle hub.

[0010] In one embodiment, the interface is disposed near the end face of the connecting end, the connecting portion is located on the end face of the connecting end, and the fastener passes through the connecting portion and the end face of the connecting end to connect the fixing sleeve and the pin seat.

[0011] In one embodiment, the connecting portion is an open ring block, the fastener passes through the open ring block and the end face of the connecting end, and the open ring block abuts against the end face of the connecting end and the fastener.

[0012] In one embodiment, the end face of the connecting end forms a limiting step, the limiting step includes a first step surface and a second step surface connected to each other, the first step surface forms a positioning post, the open ring block is located on the first step surface, and the end of the open ring block away from the fixed sleeve is provided with a limiting block, the limiting block abuts and is limited between the second step surface and the positioning post.

[0013] In one embodiment, the connecting part is a closed ring block, and the fastener passes through the end face of the closed ring block and the connecting end to connect the closed ring block to the pin seat.

[0014] In one embodiment, the connector includes a flexible tube, the fixing sleeve has an installation hole, the cross-sectional area of ​​the interface gradually decreases from the end near the needle seat to the end away from the needle seat, and the outer peripheral wall of the flexible tube slides against the inner peripheral wall of the installation hole.

[0015] In one embodiment, the interface extends along its axial direction for a length of L, wherein 3mm ≤ L ≤ 4mm.

[0016] In one embodiment, the end of the connector away from the fixing sleeve is provided with a sleeve portion, the sleeve portion having a connecting hole, and the inner peripheral wall of the connecting hole being provided with a plurality of sealing protrusions at intervals, the sleeve portion being sleeved on the end of the injection needle tube.

[0017] In one embodiment, the sleeve includes a sleeve and a connector. The sleeve has a through hole, and the inner peripheral wall of the through hole is provided with a plurality of positioning ribs at intervals. The connector has a connecting protrusion, and the connecting protrusion has the connecting hole. The sleeve is sleeved on the connecting protrusion and connected to the connector.

[0018] This utility model also proposes an injection needle treatment head, comprising:

[0019] The housing has a cavity, and one end wall of the cavity has multiple needle outlet holes;

[0020] In any of the above embodiments, the injection needle assembly has a needle hub movably housed within a cavity, and the needle hub has multiple needle tips, each needle tip corresponding to a needle outlet hole.

[0021] In one embodiment, the cavity is provided with a limiting rib, which is used to limit the travel of the needle seat, and the housing is provided with an avoidance area corresponding to the fixing sleeve.

[0022] This utility model also proposes a treatment device, comprising:

[0023] The handle is equipped with a drive motor and an injection needle tube, and the injection needle tube has a liquid storage chamber.

[0024] In any of the above embodiments, the output end of the drive motor of the injection needle treatment head is connected to the needle hub, and the liquid storage chamber of the injection needle tube is connected to the end of the connector away from the needle hub.

[0025] In this technical solution, the injection needle assembly provided by this utility model, by adopting a structure with an interface on the outer peripheral surface of the needle seat, solves the problems of excessive internal space occupation, limited needle seat movement stroke, and complex assembly caused by the interface extending along the axial direction of the needle seat in the prior art. Specifically, the interface of the needle seat is located on the outer peripheral surface of the needle seat, between the end face of the injection end and the end face of the connecting end. This design ensures that the interface does not occupy the axial space of the needle seat, thereby providing sufficient stroke space for the movement of the needle seat and meeting the requirements of miniaturized design of the injection needle assembly. At the same time, one end of the connector is sleeved on the interface, and the fixing sleeve is slidably sleeved on the connector to radially compress the connection between the connector and the interface, so that the connector is fixed to the interface, and the fixing sleeve is also connected to the needle seat. This radial sleeve method avoids the assembly allowance required in the axial direction of the traditional parallel sleeve, simplifies the assembly process, and improves assembly efficiency. In addition, the other end of the connector communicates with the liquid storage chamber of the injection needle tube, ensuring a reliable connection between the injection needle tube and the needle seat and smooth delivery of the liquid. This structural design not only optimizes the internal space utilization of the injection needle assembly but also enhances its overall performance and reliability, making it more suitable for small-size, high-precision medical injection applications. Especially in scenarios where the needle hub moves frequently, the interface is located on the outer circumference of the needle hub, and the connection between the connector and the interface is fixed by the radial compression of the retaining sleeve. This structure not only provides a reliable sealed connection but also effectively avoids problems such as loosening of the connection or leakage of medication caused by frequent movement. Furthermore, the compact structural design ensures that the injection needle assembly will not cause any obstruction or blockage during frequent movement, thus ensuring its stability and reliability in small-size, high-precision medical injection applications. Attached Figure Description

[0026] 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.

[0027] Figure 1 This invention provides a structural schematic diagram of an embodiment of an injection needle assembly.

[0028] Figure 2 A partial cross-sectional view of an embodiment of the injection needle assembly provided by this utility model;

[0029] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0030] Figure 4 A cross-sectional view of an embodiment of the injection needle assembly provided by this utility model;

[0031] Figure 5 for Figure 4 Enlarged view of section B in the middle;

[0032] Figure 6 A cross-sectional view of an embodiment of the socket portion provided by this utility model;

[0033] Figure 7 A schematic diagram of a sleeve embodiment provided by this utility model.

[0034] Explanation of icon numbers:

[0035] 100. Injection needle assembly; 1. Needle hub; 11. Interface; 12. Injection end; 13. Connecting end; 14. Limiting step; 141. First step surface; 142. Second step surface; 15. Positioning post; 16. Needle tip; 2. Connector; 21. Fixing sleeve; 211. Connecting part; 212. Limiting block; 213. Mounting hole; 22. Tube; 23. Sleeve part; 231. Connecting hole; 232. Sealing protrusion; 233. Sleeve; 233a. Through hole; 233b. Positioning rib; 234. Connector; 234a. Connecting protrusion; 3. Injection needle tube; 4. Fastener; 5. Housing; 51. Cavity; 52. Needle outlet.

[0036] 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

[0037] 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.

[0038] 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.

[0039] 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.

[0040] This utility model proposes an injection needle assembly 100.

[0041] Please see Figure 1 In one embodiment of the present invention, the injection needle assembly 100 includes a needle seat 1, a connector 2, and a fixing sleeve 21. The needle seat 1 has an injection end 12 and a connecting end 13. An interface 11 is provided on the outer peripheral surface of the needle seat 1, and the outer peripheral surface is located between the end face of the injection end 12 and the end face of the connecting end 13. One end of the connector 2 is sleeved on the interface 11, and the other end of the connector 2 communicates with the liquid storage cavity of the injection needle tube 3. The fixing sleeve 21 is slidably sleeved on the connector 2 and is used to radially compress the connection between the connector 2 and the interface 11 to fix the connector 2 on the interface 11. The fixing sleeve 21 is connected to the needle seat 1.

[0042] In this technical solution, the injection needle assembly 100 provided by this utility model, by adopting a structure in which the needle base 1 has an interface 11 on its outer peripheral surface, can solve the problems of excessive internal space occupation, limited stroke of the needle base 1, and complex assembly caused by the interface 11 extending along the axial direction of the needle base 1 in the prior art. Specifically, the interface 11 of the needle base 1 is set on the outer peripheral surface of the needle base 1, located between the end face of the injection end 12 and the end face of the connecting end 13. This design ensures that the interface 11 does not occupy the axial space of the needle base 1, thereby providing sufficient stroke space for the movement of the needle base 1 and meeting the requirements of the miniaturized design of the injection needle assembly 100. At the same time, one end of the connector 2 is sleeved on the interface 11, and the fixing sleeve 21 is slidably sleeved on the connector 2 to radially compress the sleeve joint between the connector 2 and the interface 11, so that the connector 2 is fixed to the interface 11, and the fixing sleeve 21 is also connected to the needle base 1. This radial sleeve method avoids the assembly allowance required in the axial direction of the traditional parallel sleeve, simplifies the assembly process, and improves the assembly efficiency. Furthermore, the other end of the connector 2 is connected to the liquid reservoir of the injection needle tube 3, ensuring a reliable connection between the injection needle tube 3 and the needle hub 1 and smooth delivery of the medication. This structural design not only optimizes the internal space utilization of the injection needle assembly 100 but also enhances the overall performance and reliability of the injection needle assembly 100, making it more suitable for small-size, high-precision medical injection applications. Especially in scenarios where the needle hub 1 moves frequently, since the interface 11 is located on the outer circumferential surface of the needle hub 1 and the connector 2 is fixed to the interface 11 through the radial compression of the fixing sleeve 21, this structure not only provides a reliable sealed connection but also effectively avoids problems such as loosening of the connection or leakage of medication caused by frequent movement. Moreover, the compact structural design ensures that the injection needle assembly 100 will not cause obstruction or blockage during frequent movement, ensuring its stability and reliability in small-size, high-precision medical injection applications.

[0043] Specifically, please refer to Figure 1In one embodiment, the injection needle assembly 100 includes a fastener 4, and the fixing sleeve 21 has a connecting portion 211. The connecting portion 211 is disposed at the connecting end 13, and the surface where the connecting portion 211 is located is opposite to the surface where the interface 11 is located. The fastener 4 passes through the connecting portion 211 and the connecting end 13 to connect the fixing sleeve 21 and the needle seat 1. The connecting portion 211 of the fixing sleeve 21 is located on the connecting end 13. The fastener 4 passes through the connecting portion 211 and the connecting end 13, thereby tightly connecting the fixing sleeve 21 and the needle holder 1 together. The side of the connecting portion 211 is opposite to the side of the interface 11. That is, the connecting portion 211 can be located on the end face of the connecting end 13 or on the side of the connecting end 13, but it must be opposite to the side of the interface 11 to avoid direct spatial conflict between the two. This provides more space for the movement of the needle holder 1 and the installation of other components. This design also ensures that the interface 11 no longer occupies the axial space of the needle holder 1, providing sufficient stroke space for the movement of the needle holder 1 and meeting the requirements of the miniaturized design of the injection needle assembly 100. At the same time, the use of the fastener 4 enhances the stability of the connection, ensuring a reliable connection between the injection needle tube 3 and the needle holder 1 and smooth delivery of the drug solution. This structural design not only optimizes the internal space utilization of the injection needle assembly 100, but also improves the overall performance and reliability of the injection needle assembly 100, making it more suitable for small-size, high-precision medical injection applications. The connecting part 211 can be either a closed-loop block or an open-loop block; this solution does not impose any restrictions on either.

[0044] Further, please refer to Figure 1In another embodiment, the interface 11 is disposed near the end face of the connecting end 13, the connecting part 211 is located on the end face of the connecting end 13, and the fastener 4 passes through the connecting part 211 and the end face of the connecting end 13 to connect the fixing sleeve 21 and the pin seat 1. The interface 11 is located near the end face of the connecting end 13 of the needle holder 1, which means that the interface 11 is closer to the connecting end 13 of the needle holder 1 than in the middle. The connecting part 211 is located on the end face of the connecting end 13 of the needle holder 1, and the fastener 4 passes through the connecting part 211 and the end face of the connecting end 13 of the needle holder 1, tightly connecting the fixing sleeve 21 and the needle holder 1 together. The connecting part 211 and the fastener 4 are both located on the end face of the connecting end 13, which can avoid occupying the space on the side of the connecting end 13 of the needle holder 1. At the same time, the moving direction of the needle holder 1 is from the end face of the injection end 12 to the end face of the connecting end 13. Since the two end faces will reserve space for the needle holder 1 to move when the needle holder 1 is installed, setting the connecting part 211 and the fastener 4 on the end face can optimize space utilization and simplify the assembly process. The interface 11 is positioned close to the end face of the connecting end 13, making the entire injection needle assembly 100 more compact and further optimizing space utilization. The fastener 4 provides more reliable fixation through the connection between the connecting part 211 and the end face of the connecting end 13, ensuring the stability of the injection needle assembly 100 during use. This design retains the radial compression fixing method, avoiding the axial assembly allowance required by traditional parallel sleeves, and simplifying the assembly process.

[0045] Further, please refer to Figure 1 In one embodiment, the connecting part 211 is an open ring block, and the fastener 4 passes through the open ring block and the end face of the connecting end 13. The open ring block abuts against the end face of the connecting end 13 and the fastener 4. The open ring block, through the fastener 4 (such as screws, bolts, etc.) passing through itself and the end face of the connecting end 13, firmly fixes the fixing sleeve 21 to the connecting end 13 of the needle holder 1. This structural design ensures that the fixing sleeve 21 will not loosen during use, thus ensuring the overall stability of the injection needle assembly 100. At the same time, since the open ring block itself occupies less space and area, the design of the connecting part 211 using an open ring block makes the connecting part 211 more compact in size and occupies less space, thereby achieving a tight connection without increasing the space, ensuring the stability and reliability of the injection needle assembly 100 in small-size, high-precision medical injection applications.

[0046] To ensure the reliable installation of the fixing sleeve 21, please refer to... Figure 1In one embodiment, the end face of the connecting end 13 forms a limiting step 14. The limiting step 14 includes a first step surface 141 and a second step surface 142 connected to each other. The first step surface 141 forms a positioning post 15. An open ring block is located on the first step surface 141. A limiting block 212 is provided at the end of the open ring block away from the fixing sleeve 21. The limiting block 212 abuts and is located between the second step surface 142 and the positioning post 15. The positioning post 15 is set on the first stepped surface 141, providing a precise positioning point for the open ring block. During assembly, the limiting block 212 on the open ring block can accurately abut between the positioning post 15 and the second stepped surface 142, ensuring that the installation position of the open ring block on the first stepped surface 141 is correct. By setting the first stepped surface 141, not only is an installation position provided for the positioning post 15 and the open ring block, preventing components such as the positioning post from directly occupying the liquid cavity space of the needle holder 1, thus reducing the liquid cavity volume and affecting the storage and delivery of the medicine, but also, during the process of tightening the fastener 4 with the open ring block, the setting of the first stepped surface 141 increases the installation stroke of the fastener 4, providing additional installation space and making it easier to install the fastener 4 without encroaching on the liquid cavity of the needle holder 1. This design not only The design optimizes space utilization and improves assembly convenience and efficiency. The presence of the positioning post 15 effectively prevents the open ring block from shifting laterally or longitudinally during assembly, ensuring accurate connection between the fixing sleeve 21 and the needle seat 1, thereby improving the overall assembly precision. The positioning post 15 provides additional support for the open ring block, enabling it to remain stable under the action of the fastener 4. This support effectively prevents the open ring block from deforming or shifting due to external forces during use. The cooperation between the positioning post 15 and the limiting block 212 effectively restricts the radial movement of the open ring block, preventing it from loosening due to external forces during use. This design effectively avoids drug leakage or other malfunctions caused by loose connections, improving the safety and reliability of the injection needle assembly 100.

[0047] Furthermore, by engaging the open ring block with the positioning post 15 and fixing the open ring block with the fastener 4, a structure is essentially formed in which the open ring block is clamped from left to right by the positioning post 15 and the fastener 4. This structure only requires about half the area of ​​the closed ring block to fix the connecting part 211, and can achieve miniaturization of the overall volume in the case of a small-sized pin seat.

[0048] In another embodiment, the connecting part 211 is a closed ring block, and the fastener 4 passes through the end face of the closed ring block and the connecting end 13 to connect the closed ring block to the pin seat 1. The closed-loop block design provides a stable connection platform, enabling the retaining sleeve 21 to reliably engage with the needle hub 1. Since the closed-loop block is a complete ring structure, it can evenly distribute the pressure from the fastener 4, thereby enhancing the structural stability of the entire assembly. This design not only ensures the strength of the connection but also prevents loosening or damage due to external forces during use. The fastener 4 passes through the end face of the closed-loop block and the connecting end 13, further enhancing the reliability of the connection. The fastener 4 can be a screw, pin, or other similar fixing element. Through its tight fit with the closed-loop block and the end face, it ensures a tight connection between the closed-loop block and the needle hub 1. This connection method not only provides sufficient mechanical strength but also allows for easy disassembly and maintenance when needed. Furthermore, placing the closed-loop block on the end face of the connecting end 13, rather than on the side, avoids occupying the side space of the connecting end 13 of the needle hub 1, making the layout of the entire injection needle assembly 100 more compact and rational.

[0049] To ensure the reliability of the connection between the fixing sleeve 21 and the interface 11, please refer to... Figure 2 and Figure 3 In one embodiment, the connector 2 includes a flexible tube 22, and the fixing sleeve 21 has a mounting hole 213. The cross-sectional area of ​​the interface 11 gradually decreases from the end near the needle seat 1 to the end away from the needle seat 1. The outer peripheral wall of the flexible tube 22 slides against the inner peripheral wall of the mounting hole 213. The design of the gradually decreasing cross-sectional area of ​​the interface 11 ensures that when the flexible tube 22 is fitted onto the interface 11, an interference fit is formed between the inner peripheral wall of the flexible tube 22 and the outer peripheral wall of the interface 11. This ensures a tight fit between the flexible tube 22 and the interface 11, thereby improving the reliability of the connection. The interference between the inner peripheral wall of the flexible tube 22 and the outer peripheral wall of the interface 11 is controlled between 0.1mm and 0.15mm to ensure a tight fit between the flexible tube 22 and the interface 11, improving the sealing performance while preventing the flexible tube 22 from loosening or shifting due to external forces during use, ensuring the stability of the connection. This is especially suitable for medical injections requiring high precision and high reliability. The tapered orifice design ensures a larger contact area and a tighter fit between the hose 22 and the interface 11. This tight fit effectively prevents leakage of medication or other liquids from the connection, thereby improving sealing. The tapered cross-sectional area design causes the interference fit between the hose 22 and the interface 11 to gradually increase from the end closer to the needle seat 1 to the end farther away from the needle seat 1. This makes the stress distribution between the hose 22 and the interface 11 more uniform. During use, due to the larger contact area and tighter fit, stress will not concentrate at a certain point, thereby reducing the risk of loosening or breaking of the connection due to stress concentration.

[0050] In one embodiment, the interface 11 extends along its axial direction for a length of L, wherein 3mm ≤ L ≤ 4mm. Limiting the extension length of interface 11 to within the range of 3mm≤L≤4mm ensures a suitable connection length between the fixing sleeve 21 and interface 11. An excessively short connection length may result in insufficient contact area, affecting connection stability, while an excessively long connection length may increase assembly difficulty and even cause deformation or damage to the tubing 22 during assembly. Limiting the extension length of interface 11 also ensures assembly accuracy between the fixing sleeve 21 and interface 11. During assembly, a suitable connection length ensures that the tubing 22 can be accurately fitted onto interface 11, reducing assembly errors. A suitable connection length also ensures a more uniform stress distribution between the fixing sleeve 21 and interface 11. During use, due to the suitable connection length, stress will not concentrate at a single point, reducing the risk of loosening or breakage due to stress concentration. Limiting the extension length of interface 11 to within the range of 3mm≤L≤4mm ensures a more compact overall design for the injection needle assembly 100. This design aligns with the miniaturization trend of injection needle assemblies 100, making the overall size of the injection needle assembly 100 smaller and easier to operate and use.

[0051] Further, please refer to Figures 4 to 6In one embodiment, the end of the connector 2 furthest from the fixing sleeve 21 is provided with a sleeve portion 23. The sleeve portion 23 has a connecting hole 231, and the inner peripheral wall of the connecting hole 231 is provided with multiple sealing protrusions 232 at intervals. The sleeve portion 23 is sleeved on the end of the injection needle tube 3. The design of the sealing protrusions 232 can provide multiple sealing effects. When the sleeve portion 23 is sleeved on the end of the injection needle tube 3, the sealing protrusions 232 are in close contact with the outer peripheral wall of the injection needle tube 3, forming multiple sealing points. This multiple sealing design can effectively prevent the drug or other liquids from leaking from the connection, ensuring the sealing performance of the connection. The contact between the sealing protrusions 232 and the outer peripheral wall of the injection needle tube 3 can increase the friction, thereby preventing the sleeve portion 23 from loosening or shifting due to external forces during use. This increased friction can effectively improve the stability of the connection, ensuring the reliability between the injection needle tube 3 and the connector 2. The sealing ring 232 plays a guiding role in the assembly process. When the injection needle tube 3 is inserted into the sleeve part 23, the sealing ring 232 guides the injection needle tube 3 step by step into the connecting hole 231, ensuring the accuracy and reliability of the assembly. The design of the sealing ring 232 can accommodate injection needle tubes 3 of different specifications. A larger sealing ring 232 can accommodate a thicker injection needle tube 3, while a smaller sealing ring 232 can ensure a tight fit even for a thinner injection needle tube 3. This design improves the versatility and flexibility of the injection needle assembly 100, enabling it to adapt to injection needle tubes 3 of different specifications. The sealing ring 232 and the outer peripheral wall of the end of the injection needle tube 3 are interference-fitted, with the interference amount controlled between 0.14mm and 0.2mm. This ensures a tight fit between the sleeve part 23 and the end of the injection needle tube 3, improving the sealing performance while preventing the injection needle tube 3 from loosening or shifting due to external forces during use, ensuring the stability of the connection.

[0052] Please see Figure 6 and Figure 7In one embodiment, the sleeve 23 includes a sleeve 233 and a connector 234. The sleeve 233 has a through hole 233a, and the inner peripheral wall of the through hole 233a is provided with a plurality of positioning ribs 233b at intervals. The connector 234 has a connecting protrusion 234a, and the connecting protrusion 234a has a connecting hole 231. The sleeve 233 is fitted onto the connecting protrusion 234a and connected to the connector 234. The sleeve 233 and the connector 234 are processed by rubber coating. The sleeve 233 is made of plastic, and the connector 234 is made of silicone. The plastic material has high mechanical strength and stability, which can provide good support for the entire connection structure and ensure the firmness and durability of the connection. The silicone material has good elasticity and flexibility, which can provide an effective contact surface required for sealing. During the connection process, the elasticity of the silicone can ensure a tight fit with the injection needle tube 3 or other components, thereby achieving a good sealing effect. Through the overmolding process, the plastic sleeve 233 and the silicone connector 234 can be tightly bonded together to form an integrated structure. This bonding method not only improves the strength of the connection but also reduces the sealing problems caused by material delamination. The positioning rib 233b ensures the precise positioning between the sleeve 233 and the connecting protrusion 234a. During processing, the positioning rib 233b guides the sleeve 233 to be accurately fitted onto the connecting protrusion 234a, reducing processing errors. The contact between the positioning rib 233b and the connecting protrusion 234a increases friction, further improving the stability of the connection. Combining the structural strength of the plastic and the sealing performance of the silicone, this design can significantly improve the sealing performance of the injection needle assembly 100, ensuring the safety and reliability of the drug solution during injection. The combined effect of the positioning rib 233b and the elasticity of the silicone provides a multiple sealing mechanism, effectively preventing drug leakage. The tight bond formed by the overmolding process ensures the connection stability between the sleeve 233 and the connector 234, reducing the risk of loosening or breakage due to external forces.

[0053] This utility model also proposes an injection needle treatment head, which includes a housing 5 and an injection needle assembly 100. The specific structure of the injection needle assembly 100 is as described in the above embodiments. Since this injection needle treatment head adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. Among them, the housing 5 has a cavity 51, and a plurality of needle outlet holes 52 are opened on one end wall of the cavity 51; the needle seat 1 is movably accommodated in the cavity 51, and the needle seat 1 has a plurality of needles 16, each needle 16 corresponding to a needle outlet hole 52.

[0054] Please see Figure 4In this embodiment, by setting multiple needles 16, the injection needle treatment head can perform multi-point injections simultaneously, significantly improving injection efficiency. Multiple needles 16 can distribute the medication more evenly, ensuring uniform absorption of the drug at the injection site and improving treatment efficacy. This design can meet the needs of different medical scenarios, such as dermatology and plastic surgery, where multi-point injections are required. The multi-needle design 16 provides a more flexible injection plan. The needle hub 1 is movably housed within the cavity 51, allowing it to be moved or adjusted as needed, facilitating the operator to adjust the injection position according to the actual situation. Each needle 16 corresponds to a needle outlet 52. This design ensures precise injection positioning of each needle 16, preventing leakage or mis-injection of the medication during the injection process. Each needle 16 can be operated through an independent needle outlet 52, allowing the injection depth and angle of each needle 16 to be adjusted individually, further improving the flexibility and accuracy of the injection. The cavity 51 of the housing 5 provides structural support for the needle holder 1, protecting the needle holder 1 from external factors during use and ensuring the stability and reliability of the injection needle treatment head. The design of the cavity 51 can optimize the internal space of the injection needle treatment head, making the overall design of the injection needle treatment head more compact, easy to operate and carry.

[0055] In one embodiment, a limiting rib is provided within the cavity 51 to limit the travel of the needle hub 1, and a clearance area is provided in the housing 5 corresponding to the fixing sleeve 21. The limiting rib precisely limits the travel of the needle hub 1 within the cavity 51, ensuring that the needle hub 1 does not exceed the predetermined range of motion during use, effectively preventing damage to the injection needle tube 3 or inaccurate injection due to excessive movement of the needle hub 1. The clearance area provides sufficient space for the fixing sleeve 21, avoiding interference between the fixing sleeve 21 and the housing 5. This design ensures that the fixing sleeve 21 can move freely during assembly and use without being restricted by the housing 5. The design of the limiting rib and the clearance area improves the structural stability of the injection needle treatment head, ensuring that the needle hub 1 and the fixing sleeve 21 do not loosen or shift during use, thus improving the overall reliability of the injection needle treatment head. The design of the limiting rib and the clearance area optimizes the internal space utilization of the injection needle treatment head, making the overall design of the injection needle treatment head more compact, easy to operate and carry. To control the length of the needle 16 exposed in the needle hole 52 to be 4mm during the operation, a clearance is provided between the needle holder 1 and the outer shell to accurately control the needle holder 1 to extend the needle 16 by the corresponding distance when it moves, so as to ensure that the depth and position of each injection are consistent and improve the reliability of the injection.

[0056] This invention also proposes a treatment device, including the injection needle treatment head and handle described in the above embodiments. The handle is equipped with a drive motor and an injection needle tube 3. The injection needle tube 3 has a liquid storage chamber. The output end of the drive motor is connected to the needle holder 1. The liquid storage chamber of the injection needle tube 3 is connected to the end of the connector 2 away from the needle holder 1. The drive motor can precisely control the advancement, retraction, or other actions of the needle holder 1 to ensure the accuracy and consistency of the injection process. The liquid storage chamber of the injection needle tube 3 is used to store the drug solution or other therapeutic fluid. The design of the liquid storage chamber should ensure the sterility and stability of the fluid. The injection needle tube 3 can be reliably connected to the connector 2 to achieve smooth delivery of the drug solution. When the treatment device is started, the drive motor drives the needle holder 1 to move, so that the needle tip 16 extends out of the housing 5 through the needle outlet 52. The drug solution flows from the liquid storage chamber of the injection needle tube 3 in the handle into the needle holder 1 through the connector 2, and is finally injected into the patient's body through the needle tip 16.

[0057] The treatment device of this invention can further provide a radio frequency (RF) power supply, which is electrically connected to the needle 16 of the needle holder 1. After the needle 16 is inserted into the skin, RF energy is provided to treat the skin, thereby achieving functions such as repairing collagen, dissolving fat, or eliminating tissue abnormalities. This combines the energy source's treatment of tissues with drug injection to achieve a synergistic effect. The input of RF energy can be performed before, after, or simultaneously with drug injection, which will not be elaborated here.

[0058] 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, include: A needle hub, having an injection end and a connecting end, with an interface on its outer peripheral surface, the outer peripheral surface being located between the end face of the injection end and the end face of the connecting end; A connector, one end of which is fitted onto the interface, and the other end of which is connected to the liquid reservoir of the injection needle tube; A fixing sleeve is slidably fitted onto the connector and used to radially compress the connection between the connector and the interface to fix the connector onto the interface. The fixing sleeve is connected to the pin seat.

2. The injection needle assembly as claimed in claim 1, characterized in that, The injection needle assembly includes a fastener, the fixing sleeve has a connecting portion, the connecting portion is disposed at the connecting end, and the surface where the connecting portion is located is opposite to the surface where the interface is located. The fastener passes through the connecting portion and the connecting end to connect the fixing sleeve and the needle hub.

3. The injection needle assembly as described in claim 2, characterized in that, The interface is located near the end face of the connecting end, the connecting part is located on the end face of the connecting end, and the fastener passes through the connecting part and the end face of the connecting end to connect the fixing sleeve and the pin seat.

4. The injection needle assembly as described in claim 3, characterized in that, The connecting part is an open ring block, and the fastener passes through the open ring block and the end face of the connecting end. The open ring block abuts against the end face of the connecting end and the fastener.

5. The injection needle assembly as claimed in claim 4, characterized in that, The end face of the connecting end forms a limiting step, the limiting step includes a first step surface and a second step surface connected to each other, the first step surface forms a positioning post, the open ring block is located on the first step surface, the end of the open ring block away from the fixed sleeve is provided with a limiting block, the limiting block abuts and is limited between the second step surface and the positioning post.

6. The injection needle assembly as claimed in claim 3, characterized in that, The connecting part is a closed ring block, and the fastener passes through the end face of the closed ring block and the connecting end to connect the closed ring block to the pin seat.

7. The injection needle assembly as described in any one of claims 1 to 6, characterized in that, The connector includes a flexible tube, the fixing sleeve has an installation hole, the cross-sectional area of ​​the interface gradually decreases from the end near the needle seat to the end away from the needle seat, and the outer peripheral wall of the flexible tube slides against the inner peripheral wall of the installation hole.

8. The injection needle assembly as claimed in claim 7, characterized in that, The interface extends along its axial direction for a length of L, where 3mm ≤ L ≤ 4mm.

9. The injection needle assembly as described in any one of claims 1 to 6, characterized in that, The connector has a sleeve portion at one end away from the fixed sleeve. The sleeve portion has a connecting hole, and the inner peripheral wall of the connecting hole is provided with a plurality of sealing protrusions at intervals. The sleeve portion is sleeved on the end of the injection needle tube.

10. The injection needle assembly as claimed in claim 9, characterized in that, The sleeve includes a sleeve and a connector. The sleeve has a through hole, and the inner peripheral wall of the through hole is provided with a plurality of positioning ribs at intervals. The connector has a connecting protrusion, and the connecting protrusion has a connecting hole. The sleeve is sleeved on the connecting protrusion and connected to the connector.

11. A treatment head for injection needles, characterized in that, include: The housing has a cavity, and one end wall of the cavity has multiple needle outlet holes; The injection needle assembly as described in any one of claims 1 to 10, wherein the needle hub is movably housed within the cavity, and the needle hub has a plurality of needle tips, each needle tip corresponding to a needle outlet.

12. The injection needle treatment head as described in claim 11, characterized in that, The cavity is provided with a limiting rib, which is used to limit the movement stroke of the needle seat. The housing is provided with an avoidance area corresponding to the fixing sleeve.

13. A treatment device, characterized in that, include: The handle is equipped with a drive motor and an injection needle tube, and the injection needle tube has a liquid storage chamber. The injection needle treatment head as described in any one of claims 11 to 12, wherein the output end of the drive motor is connected to the needle hub, and the liquid reservoir of the injection needle tube is connected to the end of the connector away from the needle hub.

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