A needle holder capable of long-term storage

Abstract

The application discloses a long-time storage needle aid, which comprises a shell, a launching seat and a positioning piece. The matching part of the launching seat and the limiting part of the positioning piece are connected to form a preliminary launching state. A first allowance is arranged between the launching seat and the positioning piece. The first allowance can keep the matching structure of the launching seat and the positioning piece in a non-tight and relaxed state in the static storage state and the state after the shell assembly is completed after implantation, thereby avoiding creep deformation. The application eliminates the creep risk of each component of the needle aid caused by long-term stress through allowance design, guarantees the structural reliability and use safety of the needle aid in the long-term storage and static state after implantation, and has reasonable structure design and simple assembly. The application is suitable for implantable biological information monitoring scenes.

Description

Technical Field

[0001] This invention belongs to the field of implantable medical monitoring technology, specifically relating to a needle aid that can be stored for a long time. Background Technology

[0002] Needle-implanting devices are core auxiliary instruments for subcutaneous implantation of medical devices such as implantable bio-information sensors. The long-term stability and assembly reliability of their internal positioning and locking structures directly determine clinical implantation efficiency, storage safety, and surgical convenience. They are widely used in chronic disease management, clinical monitoring, and other scenarios.

[0003] Existing needle-aid devices typically employ a rigid locking structure for internal positioning. When stored statically, the launcher, in its pre-launch state, is under continuous tension, making it highly susceptible to creep deformation. This can lead to locking failure, loose connections, and decreased positioning accuracy. Furthermore, current technology struggles to optimize for the transitional state after needle implantation, once the shell is assembled and implanted components such as sensors have not been replaced. In this state, the needle aid needs to remain stationary for extended periods. If the locking structure remains under continuous tension, it further exacerbates the risk of structural creep, shortening its lifespan and reliability. Structural deformation can also cause assembly jamming and positioning misalignment, affecting the smoothness and accuracy of clinical procedures.

[0004] Therefore, how to design a needle-assist device that can prevent the positioning and locking structure from being subjected to long-term clamping force, reduce stress accumulation, can be stored for a long time, and effectively reduce the risk of creep deformation has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] Therefore, it is necessary to provide a needle aid that can be stored for a long time to address the problem of creep in existing needle aids during long-term storage.

[0006] This application provides a needle-aid device that can be stored for a long time, comprising: The housing is used to provide mounting and support for the internal components; The positioning component is snapped and fixed to the housing. The positioning component is provided with a limiting part, which is used to snap into the launcher base. The launcher is slidably disposed within the housing and has a mating part on it; The mating part of the launcher and the limiting part of the positioning component engage with each other, keeping the launcher in the ready-to-launch state; A first margin is provided between the launcher and the positioning component; The needle-assist device also includes standard components, which are used in conjunction with the needle-assist device to complete the implantation operation.

[0007] The first margin ensures that the mating structure between the launcher and the positioning component remains loose and not tightly fitted during static storage (i.e., shelf time) and after implantation and when the housing is fully assembled, effectively reducing the risk of creep deformation.

[0008] Among them, the static storage state refers to the state in which the needle aid device is stored on the shelf after it has been assembled and is waiting to be used; the state in which the shell is assembled after implantation refers to the state in which the standard parts have been removed from the needle aid device after the needle aid device has been implanted in the human body, and only the upper and lower shells are screwed together and waiting to be used next time.

[0009] Optionally, the needle aid further includes a needle fixing component, and a second margin is provided between the transmitter and the needle fixing component, so that the mating structure between the transmitter and the needle fixing component remains in a loose state without being tightened when in a static storage state or after the implantation shell is assembled.

[0010] Optionally, the housing includes an upper housing and a lower housing, which are connected by a threaded connection; The lower housing is equipped with a pusher. When the lower housing is rotated and assembled relative to the upper housing, the pusher abuts against and drives the launcher to move upward along the axial direction.

[0011] Preferably, after the upper and lower housings are assembled in place, the launcher is driven to a preset position, and the mating part and the limiting part are in a non-tightened state, forming a first margin.

[0012] Optionally, the first margin is the axial clearance formed between the launcher and the positioning element.

[0013] Preferably, the mating part is provided with a first inclined guide surface for guiding and engaging with the first guide groove.

[0014] Optionally, two sets of vertical guide rails are arranged opposite each other on the inner wall of the launcher, and two sets of vertical channels are provided on the outer wall of the needle fixing component; the vertical guide rails and the vertical channels can be slidably engaged to realize the sliding connection between the launcher and the needle fixing component.

[0015] Preferably, the mating part is located on the outer wall of the launch pad, and the mating part and the vertical guide rail are located at different side wall positions of the launch pad, and the two are staggered.

[0016] Preferably, the peripheral wall of the launcher is provided with two sets of limiting grooves, and the two sets of limiting grooves and the two sets of vertical guide rails are located on the same circumferential wall surface of the launcher; the limiting grooves are divided into an upper locking groove, a narrow passage groove and a lower locking groove in sequence along the height direction; when the pushing part pushes the launcher to move upward relative to the needle fixing member, the boss first engages in the upper locking groove, then passes through the narrow passage groove and engages in the lower locking groove; as the launcher continues to move upward, the boss and the lower locking groove are in a non-tightened state, and the axial clearance between the boss and the lower locking groove forms the second margin, that is, the second margin is the axial clearance formed between the launcher and the needle fixing member.

[0017] Optionally, it also includes a guide pin, and a third margin can be formed between the guide pin and the needle fixing member; The third margin is the axial movement clearance between the guide pin and the pin fixing member.

[0018] Optionally, the needle assist device further includes a spring fixing member and a buffer member; the spring fixing member is snapped and fixed to the launcher; the top of the upper housing is provided with a limiting post extending downward along the axial direction; the spring fixing member is provided with a clearance hole that cooperates with the limiting post, and the limiting post passes through the clearance hole and extends into the interior of the launcher; the upper part of the buffer member abuts against the limiting post, and the lower part of the buffer member is snapped and fixed to the upper part of the needle fixing member; the lower part of the needle fixing member abuts against the bottom of the launcher, forming an axial limit on the needle fixing member, so that the needle fixing member is fixed and the launcher can slide relative to the needle fixing member.

[0019] Preferably, the boss includes a snap-fit ​​section and a guide section, and the lower part of the snap-fit ​​section has a second inclined guide surface; the positioning member is provided with a second guide groove corresponding to the guide section; the guide section passes through the narrow passage groove and slides with the second guide groove to restrict the circumferential rotation of the pin fixing member.

[0020] During the same assembly action in which the launcher is pushed upward by the pusher, the launcher moves simultaneously relative to the positioning component and the pin fixing component. The first margin and the second margin are formed synchronously in the same driving process, forming a mutually cooperating structure, realizing non-tightening and loosening of the snap-fit ​​part, and effectively reducing the risk of long-term stress creep deformation. Attached Figure Description

[0021] Figure 1 This is an exploded view of the structure of the needle-aid device in one or more embodiments of the present invention; Figure 2 This is a first overall cross-sectional view of the needle assist device when it is locked without any margin in one or more embodiments of the present invention; Figure 3 This is a second overall sectional view of the needle assist device when it is locked without any margin in one or more embodiments of the present invention; Figure 4 This is a schematic diagram of the positioning element in one or more embodiments of the present invention; Figure 5 This is another structural schematic diagram of the positioning element in one or more embodiments of the present invention; Figure 6 This is a schematic diagram of the launcher structure in one or more embodiments of the present invention; Figure 7 This is a schematic diagram of the lower housing structure in one or more embodiments of the present invention; Figure 8 This is a schematic diagram of the structure of the needle fixing member in one or more embodiments of the present invention; Figure 9 This is a schematic diagram of the first margin structure of the launcher and positioning element in one or more embodiments of the present invention; Figure 10 As described in one or more embodiments of the present invention Figure 9 A magnified view of a section at point A in the middle; Figure 11 This is a schematic diagram of the second margin structure of the launcher and the needle fixing member in one or more embodiments of the present invention; Figure 12 As described in one or more embodiments of the present invention Figure 11 A magnified view of a section at point B in the middle; Figure 13 This is a first overall sectional view of the needle aid device in storage state in one or more embodiments of the present invention; Figure 14 This is a second overall sectional view of the needle-aid device in its stored state in one or more embodiments of the present invention; Figure 15 This is a first overall cross-sectional view of the assembled housing after the needle aid device is implanted, according to one or more embodiments of the present invention. Figure 16 This is a second overall sectional view of the assembled housing after the needle insertion device is implanted, according to one or more embodiments of the present invention.

[0022] Explanation of reference numerals in the attached figures 1—Upper housing; 101—Limiting post; 2—Lower housing; 201—Pushing part; 3—Pin fixing part; 303—Vertical channel; 305—Boss; 3051—Snap-fit ​​section; 3052—Guide section; 3053—Second inclined guide surface; 4—Launch base; 40—Limiting groove; 401—Mating part; 4011—First inclined guide surface; 403—Vertical guide rail; 404—Upper snap-fit ​​groove; 405—Narrow passage groove; 406—Lower snap-fit ​​groove; 5—Positioning part; 501—First guide groove; 502—Limiting part; 503—Second guide groove; 7—Spring fixing part; 701—Allowing hole; 8—Buffer part; 9—Guide pin; 10—Sealing protective cover; 00—Standard part. Detailed Implementation

[0023] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0024] Embodiments of this application provide a needle-aid device that can be stored for an extended period of time, such as... Figures 1 to 16As shown, it may include: upper housing 1, lower housing 2, needle fixing component 3, launching base 4, positioning component 5, spring fixing component 7, and buffer component 8.

[0025] The upper housing 1 and the lower housing 2 are connected by a threaded connection to form a housing, which is used to provide installation and support for the internal components.

[0026] The positioning member 5 is snapped and fixed to the upper housing 1. The positioning member 5 is provided with a first guide groove 501 and a limiting part 502. The first guide groove 501 is specifically opened on the peripheral side wall of the positioning member 5. It is two axially arranged through grooves that are arranged opposite each other and extend along the axial direction of the positioning member 5. It is located below the limiting part 502. The limiting part 502 is a cantilever-shaped blocking structure that extends outward from the upper end of the positioning member 5. Its inner side forms a downward stepped surface and is located at the end of the stroke of the upper part of the first guide groove 501.

[0027] The launcher 4 is slidably disposed within the housing, and the upper part of the launcher 4 extends upward from the outer wall and is provided with a mating part 401.

[0028] The mating part 401 is specifically a locking arm structure, with two locking arms arranged opposite each other; each locking arm has a limiting locking protrusion on the outer side of its upper end, which is used to form a sliding fit and locking limit with the first guide groove 501 and the limiting part 502 of the positioning member 5; the mating part 401 is set on the outer wall of the launch base 4, and is located in the same circumferential wall area of ​​the launch base 4 as the vertical guide rail 403.

[0029] When the mating part 401 of the launcher 4 slides upward along the first guide groove 501, the first guide groove 501 limits the mating part 401 circumferentially through the two side groove walls, so that the mating part 401 can only move axially, thus realizing the guiding function; when the mating part 401 slides to the top of the first guide groove 501, the locking arm relies on its own elasticity to avoid the limiting locking protrusion, which is blocked by the step surface of the limiting part 502, thus realizing the locking and limiting, so that the launcher 4 cannot move downward, thereby maintaining the ready-to-launch state.

[0030] A first margin is provided between the launcher 4 and the positioning member 5, which is the axial clearance formed between the launcher 4 and the positioning member 5. The static storage state (i.e., shelf time) refers to the state where the needle aid is stored on a shelf after assembly, awaiting use. The post-implantation shell assembly state refers to the state where, after the needle aid is implanted into the human body, the standard part 00 has been detached from the needle aid, leaving only the upper and lower shells screwed together and statically stored, or after the needle aid is implanted into the human body, the standard part 00 is reassembled, and the upper and lower shells are screwed together and awaiting the next use. The first margin ensures that, in the static storage state (i.e., shelf time) and the post-implantation shell assembly state, the mating part 401 of the launcher 4 and the limiting part 502 of the positioning part 5 remain in a relaxed, non-tightened state, effectively reducing the risk of creep deformation. The standard part 00 includes a guide needle 9, a biosensor, and a sealing protective cover 10. The sealing protective cover 10 and the guide needle 9 are snapped together. The biosensor is located between the sealing protective cover 10 and the guide needle 9. The guide needle 9 is used to drive the biosensor to be implanted under the skin of the human body, and the sealing protective cover 10 is used to seal the part of the guide needle 9 and the biosensor implanted in the human body.

[0031] The circumferential sidewall of the launch pad 4 is also provided with two sets of vertical guide rails 403 and two sets of limiting grooves 40. The vertical guide rail 403 is a rib structure extending inward toward the launch base 4, and the limiting groove 40 is a combined groove structure opened along the height direction of the launch base 4. The two sets of vertical guide rails 403 and the two sets of limiting grooves 40 are respectively set on the same pair of opposite side walls of the launch base 4, and the mating part 401 is located on another pair of opposite side walls in the same circumferential wall area, and is staggered from the vertical guide rails 403 and the limiting grooves 40.

[0032] The needle fixing member 3 is slidably disposed in the launching base 4, and the outer wall of the needle fixing member 3 is provided with two sets of vertical channels 303 corresponding to the vertical guide rail 403.

[0033] Two sets of vertical channels 303 are groove structures that extend axially on the opposite outer walls of the needle fixing member 3, corresponding one-to-one with the two sets of vertical guide rails 403 of the launching base 4. The width of the vertical channel 303 is adapted to the width of the rib of the vertical guide rail 403. When the needle fixing member 3 is fitted into the launching base 4, the vertical guide rail 403 is embedded in the vertical channel 303, forming a sliding fit. During the relative sliding process between the launching base 4 and the needle fixing member 3, the vertical guide rail 403 and the groove wall of the vertical channel 303 cooperate with each other to restrict the circumferential rotation of the needle fixing member 3, allowing it to move only along the axial direction, thus achieving the guiding and anti-deviation functions.

[0034] The limiting groove 40 is divided into an upper slot 404, a narrow passage slot 405 and a lower slot 406 along the height direction of the launcher 4. These are used to form a guiding and limiting fit with the two protrusions 305 corresponding to the needle fixing member 3, so as to realize the position locking and state switching between the launcher 4 and the needle fixing member 3.

[0035] The vertical channel 303 slides with the vertical guide rail 403 of the launcher 4; the outer side wall of the needle fixing member 3 extends outward with a boss 305, the boss 305 includes a snap-fit ​​section 3051 and a guide section 3052, the lower part of the snap-fit ​​section 3051 forms a second inclined guide surface 3053; the guide section 3052 passes through the narrow passage 405 of the launcher 4 and slides with the second guide groove 503 of the positioning member 5 to restrict the circumferential rotation of the needle fixing member 3.

[0036] When the launcher 4 moves upward relative to the needle fixing member 3, the boss 305 first engages with the upper slot 404 of the launcher 4, then passes over the narrow passage slot 405 and engages with the lower slot 406; as the launcher 4 continues to move upward, the boss 305 and the lower slot 406 are in a non-tightened state, and the axial clearance between the boss 305 and the lower slot 406 forms a second margin, so that the mating structure of the launcher 4 and the needle fixing member 3 remains in a loose state of non-tightening in the static storage state (i.e., shelf time) and after the implantation shell is assembled, effectively reducing the risk of creep deformation caused by long-term stress.

[0037] The top of the upper housing 1 is provided with a limiting post 101 extending downward along the axial direction; the limiting post 101 is specifically a cross-shaped column structure extending integrally downward from the inner wall of the top of the upper housing 1, located at the center of the upper housing 1; the axial length is set according to the assembly space of the spring fixing member 7 and the buffer member 8, used to limit the upper limit of the axial displacement of the launch seat 4 and provide a support reference for the buffer member 8.

[0038] The spring fixing member 7 is snapped and fixed to the launcher 4. The spring fixing member 7 has a relief hole 701 that matches the shape of the limiting post 101. The limiting post 101 passes through the relief hole 701 and extends into the interior of the launcher 4. The upper part of the buffer member 8 abuts against the limiting post 101, and the lower part of the buffer member 8 is snapped and fixed to the upper part of the needle fixing member 3. The lower part of the needle fixing member 3 abuts against the bottom of the launcher 4, forming an axial limit on the needle fixing member 3.

[0039] Once the needle assist device is assembled (as shown in the attached document) Figure 13 and attached Figure 14 As shown), enter the static storage state (i.e., shelf life) or when the implanted shell is fully assembled (as shown in the attached document). Figure 15 and attached Figure 16 The working principle of (as shown) is as follows: The lower housing 2 is screwed onto the upper housing 1. The pushing part 201 abuts against and pushes the launching base 4 to move upward along the axial direction. During the same pushing action, the launching base 4 moves upward relative to the positioning part 5 and the needle fixing part 3. On the one hand, the mating part 401 of the launcher 4 first engages with the first guide groove 501 of the positioning member 5. After being guided along the first guide groove 501, the limiting protrusion of the mating part 401 crosses the first guide groove 501 and engages with the limiting part 502 of the positioning member 5. The launcher 4 continues to move upward to the preset position. A non-tight axial clearance, i.e., the first margin, is formed between the limiting protrusion of the mating part 401 and the limiting part 502, so that the two are in a non-tight and relaxed state, effectively reducing the risk of creep deformation caused by long-term tightness. On the other hand, when the launcher 4 moves upward relative to the needle fixing member 3, the protrusion 305 extending from the outer wall of the needle fixing member 3 first engages in the upper groove 404 of the peripheral side wall of the launcher 4, then completes the guidance along the narrow passage groove 405, and finally engages in the lower groove 406; the launcher 4 continues to move upward to the preset position, and a non-tight axial clearance is formed between the protrusion 305 and the lower groove 406, that is, the second margin, which also keeps the launcher 4 and the needle fixing member 3 in a non-tight and relaxed state, effectively reducing the risk of long-term stress creep deformation.

[0040] The first and second clearances are formed simultaneously during the same assembly process. They are complementary structures under the same inventive concept, ensuring that during long-term storage and the entire period after implantation, the interlocking structures experience no continuous tightening stress, effectively reducing the risk of creep deformation and locking failure, and improving the long-term storage reliability and operational safety of the needle aid. The direction of the axial clearance is the axial direction of the sliding motion of the launcher 4 within the positioning member 5. This direction is consistent with the puncture and implantation direction of the guide needle 9, the extension direction of the limiting post 101, and the direction of the compression spring's recovery deformation. In other words, the clearance directions of both the first and second clearances are distributed along the implantation direction (vertical direction).

[0041] In some embodiments, the upper housing 1 and the lower housing 2 are connected by a threaded connection, which facilitates quick assembly and disassembly while ensuring the structural stability of the housing and providing reliable protection for the internal components.

[0042] In some embodiments, the mating part 401 is further provided with a first inclined guide surface 4011, which engages and disengages with the first guide groove 501, thereby reducing engagement resistance and allowing the mating part 401 to smoothly pass through the first guide groove 501 and engage with the limiting part 502, thus improving assembly efficiency and engagement accuracy.

[0043] In some embodiments, the second inclined guide surface 3053 of the boss 305 cooperates with the narrow passage groove 405 to guide the boss 305 to slide smoothly from the upper slot 404 into the lower slot 406, avoiding jamming and ensuring the stable formation of the second margin.

[0044] In some embodiments, the spring retainer 7 is snapped into and fixed to the launcher 4. Together with the limiting post 101 and the clearance hole 701, it can limit the upper limit of the circumferential rotation and axial displacement of the launcher 4, and ensure the motion accuracy of the launcher 4.

[0045] In some embodiments, the buffer 8 is an elastic buffer pad that can absorb the axial impact force during the firing process. At the same time, the rigid collision between the buffer needle fixing member 3 and the upper housing 1 improves the user comfort and structural durability of the needle aid.

[0046] In some embodiments, the second guide groove 503 of the positioning member 5 cooperates with the guide section 3052 of the boss 305, which can further restrict the circumferential rotation of the needle fixing member 3, improve the fitting accuracy between the needle fixing member 3 and the launcher 4 and the positioning member 5, and ensure the locking reliability of the needle aid.

[0047] In some embodiments, the needle aid may further include a guide needle 9, and a third margin may be formed between the guide needle 9 and the needle fixing member 3; the third margin is the axial movement clearance between the guide needle 9 and the needle fixing member 3, which enables the mating parts of the two to remain in a non-tightened and relaxed state, reducing the risk of creep deformation caused by long-term stress.

[0048] It should be understood that the above embodiments are exemplary and are not intended to include all possible embodiments covered by the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several embodiments of this application and do not limit the scope of protection of this patent application.

Claims

1. A needle-aid device that can be stored for a long time, comprising a launcher (4) and a positioning element (5), characterized in that, The mating part (401) of the launcher (4) is engaged with the limiting part (502) of the positioning member (5) in a ready-to-launch state; A first margin is provided between the launcher (4) and the positioning member (5); The first margin allows the mating structure between the launcher (4) and the positioning member (5) to remain in a non-tightened and relaxed state when the device is in a static storage state and after the housing is assembled after implantation, thus avoiding creep deformation. The first margin is the axial clearance formed between the launcher (4) and the positioning member (5); It also includes a needle fixing component (3); A second margin is provided between the launcher (4) and the needle fixing member (3) so that the mating structure between the launcher (4) and the needle fixing member (3) remains in a non-tightened and relaxed state when the device is in a static storage state and after the implantation shell is assembled.

2. The needle-aiding device according to claim 1, characterized in that, The housing includes an upper housing (1) and a lower housing (2), which are connected by a threaded connection, and the positioning member (5) is snapped into the upper housing (1). The lower housing (2) is provided with a pushing part (201). When the lower housing (2) is rotated and assembled relative to the upper housing (1), the pushing part (201) abuts against and pushes the launcher (4) to move upward relative to the positioning member (5).

3. The needle-aiding device according to claim 2, characterized in that, The positioning component (5) is provided with a first guide groove (501); When the housing is assembled, the mating part (401) first engages with the first guide groove (501). When the pushing part (201) pushes the launcher (4) to move upward relative to the positioning member (5), the mating part (401) passes over the first guide groove (501) and engages with the limiting part (502). The launcher (4) is pushed to a preset position. The mating part (401) and the limiting part (502) are in a loose engagement state, so that the mating part (401) and the limiting part (502) are prevented from creeping and deforming due to long-term stress.

4. The needle-aiding device according to claim 3, characterized in that, The mating part (401) is provided with a first inclined guide surface (4011). The mating part (401) is engaged and disengaged from the first guide groove (501) through the first inclined guide surface (4011) to achieve guiding engagement with the first guide groove (501).

5. The needle-aid device according to any one of claims 2-4, characterized in that, The launcher (4) is provided with a vertical guide rail (403) inside, and the needle fixing member (3) is provided with a vertical channel (303) accordingly. The vertical guide rail (403) and the vertical channel (303) can be slidably engaged to realize the sliding connection between the launcher (4) and the needle fixing member (3).

6. The needle-aiding device according to claim 5, characterized in that, The launcher (4) has a limiting groove (40) on its peripheral sidewall. The limiting groove (40) is divided into an upper slot (404), a narrow passage slot (405) and a lower slot (406) along the height direction. The needle fixing member (3) has a boss (305) on its outer side. The pushing part (201) pushes the launching seat (4) to move upward relative to the needle fixing member (3). The boss (305) first enters the upper slot (404). The boss (305) passes through the narrow passage slot (405) and enters the lower slot (406). The launching seat (4) continues to move upward. The boss (305) and the lower slot (406) are in a non-tightened state. The axial clearance between the boss (305) and the lower slot (406) forms the second margin.

7. The needle-aiding device according to claim 6, characterized in that, It also includes a spring fixing member (7) and a buffer member (8), wherein the spring fixing member (7) is snapped and fixed to the launch base (4); The upper housing (1) is provided with a limiting post (101) extending downward along the axial direction, and the spring fixing member (7) is provided with a clearance hole (701) that cooperates with the limiting post (101). The limiting post (101) passes through the clearance hole (701) and extends into the launcher (4). The upper part of the buffer (8) abuts against the limiting post (101), the lower part of the buffer (8) is engaged with the upper part of the needle fixing member (3), and the lower part of the needle fixing member (3) abuts against the bottom of the launching seat (4), thus forming an axial limit on the needle fixing member (3).

8. The needle-aiding device according to claim 6, characterized in that, The boss (305) includes a snap-fit ​​section (3051) and a guide section (3052), and a second inclined guide surface (3053) is formed on the lower part of the snap-fit ​​section (3051). The positioning component (5) is provided with a second guide groove (503) corresponding to the guide section (3052); The boss (305) is engaged and disengaged from the narrow passageway groove (405) via the second inclined guide surface (3053); The guide section (3052) passes through the channel formed in the middle of the narrow passage groove (405) and slides with the second guide groove (503) to restrict the circumferential rotation of the needle fixing member (3).

9. The needle-aiding device according to claim 1, characterized in that, The second margin is the axial clearance formed between the launcher (4) and the needle fixing member (3).

10. The needle-aiding device according to claim 1, characterized in that, It also includes a guide pin (9), and a third margin can be formed between the guide pin (9) and the needle fixing member (3); The third margin is the axial movement clearance between the guide pin (9) and the pin fixing member (3).

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