A safety shield for a syringe and a syringe

Abstract

The utility model discloses a kind of safety protection device and syringe for injection, applied to syringe equipment field, safety protection device for injection includes needle guard, first limiting part and second limiting part are equipped on needle guard, the side wall of needle guard is also equipped with embracing ring, embracing ring is elastic structure;When needle guard is in initial state or protective state to shield needle head located on needle cylinder, embracing ring and the circumferential portion of recess portion abut along the radial direction of needle cylinder, first limiting part and limiting platform are connected along the axial direction of needle cylinder;When needle guard is in recovery state to release needle head, second limiting part and limiting platform are connected along the axial direction of needle cylinder, embracing ring and the rear end side wall of needle cylinder abut.The safety protection device for injection provided by the utility model can prevent needle guard from being irreversibly deflected due to jolt impact, avoid interference jam caused by deflection of needle guard when syringe is loaded and unloaded, and can ensure smooth movement of needle guard from initial state to recovery state and then to protective state.

Description

Technical Field

[0001] This utility model relates to the field of syringe equipment, and in particular to a safety protection device for injection and a syringe. Background Technology

[0002] For pre-filled syringes, in order to facilitate retrieval and reduce the risk of injury to workers, related technologies generally use a needle sheath. The needle sheath is installed at the needle tip. When the syringe is in use, the needle sheath is retracted to the syringe barrel to expose the needle tip. After the syringe is finished, the needle sheath is extended to the needle tip to block the needle tip and prevent it from being exposed.

[0003] During the transportation of pre-filled syringes, storage components with multiple mounting holes are typically used to insert the pre-filled syringes into the corresponding mounting holes. However, due to the tendency of pre-filled syringes to shake during transportation and during loading and transfer when filling pharmaceutical solutions at the factory, the needle sheath may collide with the mounting hole, causing radial sway of the needle sheath. This leads to interference and jamming between the needle sheath and the mounting hole, affecting the efficiency of retrieving the pre-filled syringe. Furthermore, the radial sway of the needle sheath obstructs the movement of the needle sheath relative to the needle tip, affecting its usability.

[0004] Therefore, how to improve the reliability of safety protection devices for injection is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a safety protection device and syringe for injection, which can improve the reliability of the needle sheath and ensure its effectiveness.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An injection safety protection device is applied to a syringe. The syringe has a limiting platform at its front end and a recess is formed between the rounded shoulder transition of the syringe and the limiting platform. The device includes a needle protector that is movably mounted on the syringe barrel. The needle protector has a first limiting part and a second limiting part. The side wall of the needle protector also has a retaining ring, which is an elastic structure.

[0008] When the needle sheath is in the initial state or the protective state to cover the needle located on the syringe, the retaining ring abuts against the periphery of the recessed portion along the radial direction of the syringe, and the first limiting portion is engaged with the limiting platform along the axial direction of the syringe; when the needle sheath is in the retracted state to release the needle, the second limiting portion is engaged with the limiting platform along the axial direction of the syringe, and the retaining ring abuts against the rear end sidewall of the syringe.

[0009] On the other hand, the needle sheath is provided with a first clearance groove, the retaining ring is located in the first clearance groove, and the shape of the retaining ring is adapted to the structure of the round shoulder transition of the syringe, so that when the needle sheath is in the initial state or the protective state, the retaining ring fits against the round shoulder transition of the syringe.

[0010] On the other hand, one end of the retaining ring is fixed to the protective needle sleeve, and the edge of the other end is provided with an arc-shaped structure with the same circumferential curvature as the recessed part; and / or, the left and right sides of the fixed end of the retaining ring are provided with a first ring deformation groove, and the fixed end of the retaining ring is provided with a second ring deformation groove on the radially outer side.

[0011] On the other hand, the end of the needle sheath facing away from the syringe barrel is provided with a tapered portion, and the tapered portion is provided with a needle sheath deformation groove so that the tapered portion can expand or contract; the second limiting portion is a second limiting boss provided on the inner wall of the tapered portion; when the needle sheath is in the retracted state, the second limiting boss engages with the end face of the limiting platform near the needle tip of the syringe barrel.

[0012] On the other hand, a damping component is also provided on the inner wall of the needle sheath. The damping component is disposed adjacent to the second limiting part, and when the needle sheath moves to the retracted state, the damping component passes over the limiting platform and moves to the transition between the limiting platform and the round shoulder.

[0013] On the other hand, the inner rear end of the needle sheath is chamfered to create a gap between the rear end of the needle sheath and the surface of the syringe.

[0014] On the other hand, it also includes a soft needle cap for covering the needle tip, the soft needle cap being detachably mounted on the syringe, and the soft needle cap having a support platform; the needle sheath also has a second clearance groove and a limiting arm, the limiting arm being suspended in the second clearance groove;

[0015] Furthermore, when the needle sheath is in its initial state, the limiting arm abuts radially against the support platform, and the soft needle cap covers the step of the syringe; when the needle sheath moves toward the first direction, the support platform can lift the suspended end of the limiting arm so that the suspended end passes over the limiting platform; when the needle sheath is in the protective state, the suspended end engages with the side of the limiting platform near the needle tip.

[0016] On the other hand, the number of limiting arms and the number of retaining rings are both at least two. The limiting arms and the retaining rings are evenly distributed along the periphery of the needle sheath, and the limiting arms and the retaining rings are alternately distributed along the periphery of the needle sheath.

[0017] On the other hand, the suspension end of the limiting arm has a plane that can abut against the axial front end face of the limiting platform. The inner side of the limiting arm is provided with a first guide slope and a second guide slope that can cooperate with the limiting platform for guidance. The first guide slope and the second guide slope are arranged along a first direction, and the inclination directions of the first guide slope and the second guide slope are opposite.

[0018] On the other hand, it also includes:

[0019] The base and the syringe are separate structures, and the base can be sleeved on the front end of the syringe; the limiting platform is located at one end of the base, and the other end of the base is provided with a claw, which abuts against the step of the syringe;

[0020] The claw is an elastic claw. When the base is axially fitted with the syringe, the claw of the base undergoes elastic deformation, so that the claw automatically rebounds and engages with the stepped end face of the syringe.

[0021] On the other hand, the inner circumferential surface of the limiting platform is a conical surface, and the outer circumferential surface of the assembly section of the syringe is a cylindrical surface; or, the inner circumferential surface of the limiting platform is a cylindrical surface, and the outer circumferential surface of the assembly section of the syringe is a conical surface; or, both the inner circumferential surface of the limiting platform and the outer circumferential surface of the assembly section of the syringe are conical surfaces, and the two have different tapers, so that the inner wall of the rear end of the limiting platform is in line contact with the outer circumferential surface of the rear end of the assembly section.

[0022] And / or, the inner circumferential surface of the claw is a conical surface, the diameter of the inner circumferential surface of the claw gradually increases from one end away from the limiting platform to the other end, and the taper of the inner circumferential surface of the claw is greater than the taper of the outer circumferential surface of the assembly section of the syringe, so that a gap is formed between the inner wall of the claw and the outer circumferential surface of the assembly section.

[0023] The assembly section of the syringe refers to the section on the syringe located between the rounded shoulder transition and the step.

[0024] This utility model also provides a syringe, including a syringe barrel and the injection safety protection device described in any one of the above.

[0025] The safety protection device for injection provided by this utility model is applied to a syringe. The front end of the syringe is provided with a limiting platform, and a recess is formed between the rounded shoulder transition of the syringe and the limiting platform. It includes a needle protector, which is movably mounted on the syringe barrel. The needle protector is provided with a first limiting part and a second limiting part. A retaining ring is also provided on the side wall of the needle protector. The retaining ring is an elastic structure. When the needle protector is in the initial state or the protective state to cover the needle located on the syringe barrel, the retaining ring abuts against the periphery of the recess along the radial direction of the syringe barrel, and the first limiting part is engaged with the limiting platform along the axial direction of the syringe barrel. When the needle protector is in the retracted state to release the needle, the second limiting part is engaged with the limiting platform along the axial direction of the syringe barrel, and the retaining ring abuts against the rear side wall of the syringe barrel. The injection safety protection device provided by this utility model, by utilizing the first limiting part and the second limiting part, can achieve axial limiting of the needle sheath and the syringe barrel when the needle sheath is in the initial state, protective state, or retracted state; by utilizing the design of the retaining ring, it can achieve radial limiting of the needle sheath and the syringe barrel. During transportation, when the needle sheath is impacted and swayed in the mounting hole of the storage component, the elastic rebound force of the retaining ring can drive the needle sheath to return to the axial alignment state with the syringe barrel, ensuring that the needle sheath and the syringe barrel are always coaxial, preventing irreversible swaying of the needle sheath due to bumps and impacts, avoiding interference and jamming caused by the swaying of the needle sheath when loading and unloading the syringe, and ensuring smooth movement of the needle sheath from the initial state to the retracted state and then to the protective state.

[0026] The syringe provided by this utility model is equipped with the above-mentioned injection safety protection device. Since the injection safety protection device has the above-mentioned technical effects, the syringe equipped with the injection safety protection device should also have the corresponding technical effects. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies 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 these drawings without creative effort.

[0028] Figure 1 An exploded view of one specific embodiment of the injection safety protection device provided in this application;

[0029] Figure 2-1 This is a schematic diagram of the structure of the injection safety protection device provided in this application in its initial state;

[0030] Figure 2-2 for Figure 2-1 An enlarged schematic diagram of structure A shown;

[0031] Figure 3-1 A schematic diagram of the injection safety protection device provided in this application in the recovery state;

[0032] Figure 3-2 for Figure 3-1 A schematic cross-sectional view of the injection safety protection device shown in Figure AA;

[0033] Figure 3-3 for Figure 3-2 An enlarged schematic diagram of structure B shown;

[0034] Figure 4-1 A schematic diagram of the safety protection device for injection provided in this application in the protected state;

[0035] Figure 4-2 for Figure 4-1 A schematic cross-sectional view of the injection safety protection device shown;

[0036] Figure 4-3 for Figure 4-2 An enlarged schematic diagram of the C structure shown;

[0037] Figure 5-1 for Figure 1 Left view of the needle sheath in the injection safety device shown;

[0038] Figure 5-2 for Figure 5-1 A schematic diagram of the CC cross-section of the needle sheath shown;

[0039] Figure 6-1 for Figure 1 Front view of the needle sheath in the injection safety protection device shown;

[0040] Figure 6-2 for Figure 6-1 The diagram shows a cross-sectional view of the needle sheath shown.

[0041] Figure 7-1 for Figure 1 The assembly diagram of the syringe and base in the injection safety protection device shown;

[0042] Figure 7-2 for Figure 7-1 An enlarged schematic diagram of the D structure shown;

[0043] Figure 8 for Figure 1 The diagram shows the structure of the injection safety protection device when the syringe and the base are separate parts.

[0044] Figure label:

[0045] Needle sheath 1; First clearance groove 101; Second clearance groove 102; First limiting part 11; Second limiting part 12; Holding ring 13; First ring deformation groove 131; Second ring deformation groove 132; Arc-shaped structure 133; Limiting arm 14; First guide slope 141; Second guide slope 142; Damping component 15; Gradient part 16; Needle sheath deformation groove 161; Chamfer 17; Soft needle cap 2; Support platform 21; Notch 22; Base 3; Limiting platform 31; Claw 32; Syringe 4; Step 41; Needle tip 42; Round shoulder transition 43; Recess 44. Detailed Implementation

[0046] The core of this invention is to provide a safety protection device and syringe for injection, which can reduce the radial runout of the needle sheath, ensure the positional accuracy of the needle sheath, and not affect normal use.

[0047] 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 protection scope of the present utility model.

[0048] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Please refer to Figures 1 to 8 In this embodiment, the injection safety protection device is applied to the syringe 4. The front end of the syringe 4 is provided with a limiting platform 31, and a recess 44 is formed between the round shoulder transition 43 of the syringe 4 and the limiting platform 31.

[0050] The injection safety device includes a needle sleeve 1, which is movably mounted on the syringe barrel 4. That is, when the needle sleeve 1 is subjected to external force, it can move relative to the syringe barrel 4. When the needle sleeve 1 moves to certain specific positions, the position of the needle sleeve 1 can remain stationary relative to the syringe barrel 4. The needle sleeve 1 is provided with a first limiting part 11 and a second limiting part 12. The side wall of the needle sleeve 1 is also provided with a retaining ring 13, which is an elastic structure.

[0051] When the needle sheath 1 is in the initial state or in the protective state to cover the needle 42 located on the syringe 4, the retaining ring 13 and the periphery of the recess 44 abut against each other radially along the syringe 4 to achieve radial limiting, and the first limiting part 11 and the limiting platform 31 are engaged axially along the syringe 4; when the needle sheath 1 is in the retracted state to release the needle 42, the second limiting part 12 and the limiting platform 31 are engaged axially along the syringe 4, and the retaining ring 13 abuts against the rear end side wall of the syringe 4 to reduce the shaking of the needle sheath 1.

[0052] Specifically, through the setting of the first limiting part 11 and the second limiting part 12, the two end faces of the limiting platform 31 located at the front end of the syringe 4 respectively realize the limiting of the needle sheath 1 in the initial state, the protective state, and the retracted state. The front end of the syringe 4 refers to the end of the syringe 4 near the needle tip 42; the retaining ring 13 and the needle sheath 1 can be integrally formed. The retaining ring 13 is located on the side of the first limiting part 11 away from the second limiting part 12. Specifically, the first limiting part 11 is located at the rear end of the needle sheath 1, and the second limiting part 12 is located at the front end of the needle sheath 1, ensuring... To ensure the strength of the retaining ring 13, the retaining ring 13 is able to elastically deform relative to the needle sheath 1. In the initial state of the needle sheath 1, the retaining ring 13 can extend into the recess 44. The retaining ring 13 should abut against the outer wall of the recess 44 to prevent the needle sheath 1 from shifting radially along the syringe 4. When the needle sheath 1 moves toward the first direction, that is, when the needle sheath 1 switches from the initial state to the retracted state, the retaining ring 13 will elastically deform under the action of the round shoulder transition 43 of the syringe 4, so that the retaining ring 13 disengages from the recess 44 and abuts against the outer peripheral surface of the rear end of the syringe 4.

[0053] It should be noted that the rounded shoulder transition 43 is a transition structure at the front end of the pointer cylinder 4, while the recessed part 44 refers to the recessed structure between the rounded shoulder transition 43 and the limiting platform 3.

[0054] This injection safety protection device, using the first limiting part 11 and the second limiting part 12, can achieve axial limiting between the needle sheath 1 and the syringe 4 when the needle sheath 1 is in the initial state, the protective state, or the retracted state; and uses the design of the retaining ring 13 to achieve radial limiting between the needle sheath 1 and the syringe 4. During transportation, when the needle sheath 1 is impacted and swayed in the mounting hole of the storage component, the elastic rebound force of the retaining ring 13 can drive the needle sheath 1 to return to the axial alignment state with the syringe 4, ensuring that the needle sheath 1 and the syringe 4 are always coaxial, preventing irreversible swaying of the needle sheath 1 due to bumps and impacts, avoiding interference and jamming caused by the swaying of the needle sheath 1 when loading and unloading the syringe, and ensuring smooth movement of the needle sheath 1 from the initial state to the retracted state and then to the protective state.

[0055] In some embodiments, the needle sheath 1 is provided with a first clearance groove 101, and the retaining ring 13 is located in the first clearance groove 101. The shape of the retaining ring 13 is adapted to the structure of the round shoulder transition 43 of the syringe 4. That is, the retaining ring 13 has an arc, and the arc of the retaining ring 13 is consistent with the arc of the round shoulder transition 43. When the needle sheath 1 is in the initial state or the protective state, the retaining ring 13 fits against the round shoulder transition 43 of the syringe 4 to achieve axial limiting. Only when the needle sheath 1 is pushed backward with force can the retaining ring 13 pass over the round shoulder transition 43. When there is no external force, the round shoulder transition 43 can prevent the retaining ring 13 from moving toward the rear end of the syringe 4. Specifically, the first clearance groove 101 provides space for the elastic deformation of the retaining ring 13. The end of the retaining ring 13 has an arc structure consistent with the structure of the round shoulder transition 43 of the syringe 4. During transportation, the retaining ring 13 elastically fits the round shoulder transition 43 of the syringe 4 through pre-deformation to offset the impact. After the impact, the retaining ring 13 resets and pushes the needle sleeve 1 to reset, ensuring that it is in a coaxial position with the syringe 4. In addition, through the design of the retaining ring 13, when the needle sleeve 1 is in the initial state or in the protective state to cover the needle tip 42, the retaining ring 13 and the round shoulder transition 43 can also form a limiting effect along the axis of the syringe 4. This ensures that the needle sleeve 1 will not easily move towards the rear end of the syringe 4 in the initial state. Only when the needle sleeve 1 is pushed forcefully will the retaining ring 13 be driven to expand and cross the round shoulder transition 43 of the syringe 4. Therefore, the retaining ring 13 can also play a limiting role with the syringe 4, ensuring the stability of the needle sleeve 1.

[0056] In some embodiments, one end of the retaining ring 13 is fixed to the needle sheath 1, and the other end edge is provided with an arc-shaped structure 133 with the same curvature as the periphery of the recessed portion 44. The periphery of the recessed portion 44 refers to the outer peripheral surface of the recessed portion 44 at the recessed position. By setting the arc-shaped structure 133, the retaining ring 13 and the recessed portion 44 can fit more closely. In order to improve the radial positioning effect between the needle sheath 1 and the syringe 4, the retaining ring 13 can have a certain width in the circumferential direction of the needle sheath 1.

[0057] In some implementations, such as Figure 5-1 and Figure 5-2 As shown, the fixed end of the retaining ring 13 is provided with a first ring deformation groove 131 on the left and right sides, and the fixed end of the retaining ring 13 is provided with a second ring deformation groove 132 on the radially outer side. By setting the first ring deformation groove 131 and the second ring deformation groove 132, the connection area between the retaining ring 13 and the protective needle sleeve 1 can be reduced, which facilitates the expansion and deformation of the retaining ring 13.

[0058] In some embodiments, the first limiting part 11 and the second limiting part 12 of the needle sheath 1 can be a buckle, a locking arm, or a limiting boss, etc. If the above structure is adopted, when the needle sheath 1 is in the initial state or the protective state to cover the needle 42, the first limiting part 11 is engaged with the axial rear end of the limiting platform 31. When the needle sheath 1 is in the retracted state to release the needle 42, the second limiting part 12 is engaged with the axial front end of the limiting platform 31. The axial rear end of the limiting platform 31 is the end of the limiting platform 31 away from the needle 42, and the axial front end of the limiting platform 31 is the end of the limiting platform 31 close to the needle 42.

[0059] In some embodiments, the first limiting part 11 is a first limiting protrusion, and the end face of the first limiting part 11 is engaged with the end face of the limiting platform 31, so that the needle sleeve 1 cannot detach towards the front end of the syringe 4; specifically, the first limiting part 11 may be set adjacent to the first clearance groove 101.

[0060] In some embodiments, the end of the needle sheath 1 facing away from the syringe barrel 4 is provided with a tapered portion 16, and the tapered portion 16 is provided with a needle sheath deformation groove 161 to facilitate the expansion or contraction of the tapered portion 16; the second limiting portion 12 is a second limiting boss provided on the inner wall of the tapered portion 16, and the limiting end face of the second limiting boss faces the first limiting portion 11 to ensure that when the needle sheath 1 is in the retracted state, the needle sheath 1 will not continue to move towards the rear end of the syringe barrel 4; when the needle sheath 1 is in the retracted state, the first limiting portion 12 is provided with a tapered portion 16, and the second limiting portion 16 ... The two limiting bosses engage with the end face of the limiting platform 31 near the needle tip 42 of the syringe 4. Specifically, the extension direction of the needle sleeve deformation groove 161 is parallel to the extension direction of the needle sleeve 1. There can be two or more needle sleeve deformation grooves 161, which are symmetrically or evenly distributed around the periphery of the tapering part 16, so that the tapering part 16 can expand or contract. Thus, when the needle sleeve 1 is in the retracted state, there is a certain clamping force between the needle sleeve 1 and the limiting platform 31, reducing the shaking of the needle sleeve 1.

[0061] In some embodiments, a damping component 15 is also provided on the inner wall of the needle sheath 1. The damping component 15 is disposed adjacent to the second limiting part 12. When the needle sheath 1 moves to the retracted state, the damping component 15 passes over the limiting platform 31 and moves to the space between the limiting platform 31 and the rounded shoulder transition 43. Of course, the damping component 15 may also partially overlap with the rounded shoulder transition 43. By providing the damping component 15, the needle sheath 1 can be prevented from sliding towards the front end of the syringe 4 when in the retracted state, ensuring the smooth progress of the injection process. Furthermore, there can be a movable gap between the damping component 15 and the limiting platform 31, so that the needle sheath 1 has a certain amount of room to move when in the retracted state. Specifically, the damping component 15 can be an arc-shaped protrusion structure, which is integrally injection molded with the needle sheath 1, making it easy to process.

[0062] In one embodiment, to ensure that the protective needle sleeve 1 does not wobble when in the protective state, the first limiting part 11 and the limiting platform 31 can be threadedly connected, and the first limiting part 11 and the limiting platform 31 can be fastened, that is, the first limiting part 11 and the limiting platform 31 have different thread pitches, which can ensure that the first limiting part 11 is better threadedly fastened to the limiting platform 31. When it is necessary to change the position of the protective needle sleeve 1, the first limiting part 11 and the limiting platform 31 can be loosened by turning.

[0063] In one embodiment, to ensure that the needle sleeve 1 does not wobble when it is in the retracted state, the second limiting part 12 and the limiting platform 31 can also be threadedly connected. That is, the second limiting part 12 is an internal thread provided inside the needle sleeve 1, and the limiting platform 31 is provided with an external thread. The internal thread and the external thread can be tightened and fixed. Furthermore, the second limiting part 12 and the limiting platform 31 can be fastened together. That is, the pitch of the second limiting part 12 and the limiting platform 31 is different, which can ensure that the second limiting part 12 is better threadedly fastened to the limiting platform 31. When it is necessary to change the position of the needle sleeve 1, the second limiting part 12 and the limiting platform 31 can be loosened by screwing.

[0064] In some embodiments, the inner rear end of the needle sheath 1 is provided with a chamfer 17 so that a gap is formed between the rear end of the needle sheath 1 and the surface of the syringe 4, preventing the label scale paper on the syringe 4 from being torn off when the needle sheath 1 moves toward the rear end of the syringe 4.

[0065] In some embodiments, a soft needle cap 2 for covering the needle tip 42 is also included. The soft needle cap 2 is detachably mounted on the syringe 4 and has a support platform 21. The needle sleeve 1 is also provided with a second clearance groove 102 and a limiting arm 14, with the limiting arm 14 suspended in the second clearance groove 102. When the needle sleeve 1 is in the initial state, the limiting arm 14 and the support platform 21 are radially abutted, and the soft needle cap 2 covers the step 41 of the syringe 4. When the needle sleeve 1 moves toward a first direction, as shown by the arrow in Figure 2, the support platform 21 can lift the suspended end of the limiting arm 14 so that the suspended end passes over the limiting platform 31. When the needle sleeve 1 is in the protective state, the suspended end is engaged with the side of the limiting platform 31 near the needle tip 42.

[0066] Specifically, the dimensions of the support platform 21 and the limiting platform 31 are matched so that the limiting arm 14 can pass over the limiting platform 31 when the needle sheath 1 is retracted. Specifically, the support platform 21, through its cooperation with the guide slope on the limiting arm 14, supports the limiting arm 14 when the needle sheath 1 moves in the first direction, thereby causing the limiting arm 14 to swing outward towards the needle sheath 1 until the protrusion on the limiting arm 14 smoothly passes over the limiting platform 31. After the injection is completed, since the soft needle cap 2 is removed at this time, the support platform 21 no longer functions. When the needle sheath 1 moves away from the first direction, the limiting arm 14 will pass over the limiting platform 31 again under the action of its guide slope. Then, under the elastic deformation of the limiting arm 14, the suspended end face of the limiting arm 14 will fit against the end face of the limiting platform 31 to achieve a locking. Preferably, the soft needle cap 2 is a rubber soft needle cap 2, which is easy to process, easy to disassemble and assemble, and has a good protective effect; furthermore, in order to ensure that the soft needle cap 2 can be removed smoothly, a notch 22 is provided at one end of the soft needle cap 2 near the syringe 4 to avoid the second limiting part 12 structure of the needle sleeve 1.

[0067] In some embodiments, the number of limiting arms 14 and the number of retaining rings 13 are both at least two. The limiting arms 14 and retaining rings 13 are evenly distributed along the periphery of the needle sleeve 1, and the limiting arms 14 and retaining rings 13 are alternately distributed along the periphery of the needle sleeve 1. For example, when the number of limiting arms 14 and the number of retaining rings 13 are both two, the two limiting arms 14 can be symmetrically distributed relative to the needle sleeve 1, and the two retaining rings 13 can also be symmetrically distributed relative to the needle sleeve 1. Since the limiting arms 14 can also play a certain radial limiting role, the line connecting the two limiting arms 14 is perpendicular to the line connecting the two retaining rings 13, so that the needle sleeve 1 can be limited in four different directions. Of course, in order to ensure the limiting effect on the needle sleeve 1 and prevent the needle sleeve 1 from swinging relative to the syringe 4, resulting in the two being out of axis, more than three retaining rings 13 can be provided and evenly distributed around the periphery of the needle sleeve 1.

[0068] In some embodiments, the suspended end of the limiting arm 14 has a plane that can abut against the end face of the limiting platform 31. The inner side of the limiting arm 14 is provided with a first guide slope 141 and a second guide slope 142 that can cooperate with the limiting platform 31 for guidance. The first guide slope 141 and the second guide slope 142 are arranged along a first direction, and the inclination directions of the first guide slope 141 and the second guide slope 142 are opposite. Specifically, for example... Figure 4-3 As shown, the first guide slope 141 functions when the needle sheath 1 transitions from the retracted state to the protective state, and the second guide slope 142 functions when the needle sheath 1 switches from the initial state to the retracted state.

[0069] In some implementations, such as Figure 1 and 8 As shown, it also includes:

[0070] The base 3 and the syringe 4 are separate structures. The base 3 can be fitted onto the front end of the syringe 4, that is, the end of the syringe 4 used to install the needle 42. The limiting platform 31 is located at one end of the base 3, and the other end of the base 3 is provided with a claw 32, which abuts against the step 41 of the syringe 4.

[0071] The claw 32 is an elastic claw. When the base 3 is axially fitted with the syringe 4, the claw 32 of the base 3 undergoes elastic deformation so that the claw 32 automatically rebounds and engages with the end face of the step 41 of the syringe 4.

[0072] Specifically, the base 3 serves as a limiting element. By mounting the base 3 onto the syringe 4, the position of the needle sheath 1 is restricted, thereby ensuring the positional stability of the needle sheath 1 in different states. Specifically, in the initial state, the needle sheath 1, such as... Figure 2-1 and Figure 2-2 The image shows the state after the injection safety protection device is assembled with the syringe 4. At this state, the needle sheath 1 covers the needle tip 42, facilitating transportation and handling. During use, the needle sheath 1 needs to be pulled in a first direction away from the needle tip 42. The first direction is... Figure 2-1 as well as Figure 3-1 The direction indicated by the middle arrow indicates that the needle sheath 1 is in the retracted state, as shown. Figures 3-1 to 3-3 As shown, the needle 42 is exposed at this time, facilitating injection. After the injection is completed, the needle sheath 1 is returned to its initial position, at which point the needle 42 is in a protected state, as shown. Figures 4-1 to 4-3 As shown, the needle 42 is no longer used, and the needle sheath 1 can prevent the needle 42 from harming the user. Furthermore, the separate design of the base 3 and the syringe 4 facilitates the processing of the base 3. The material of the base 3 can be selected to be a lower-cost material than that of the syringe 4, thereby reducing processing costs. In addition, the design of the clamp 32 makes the assembly of the base 3 and the syringe 4 more convenient, efficient, and secure.

[0073] Furthermore, when the base 3 and the syringe 4 are separate structures, the base 3 and the needle sleeve 1 can be assembled separately. Specifically, the base 3 can be inserted into the needle sleeve 1 from the end of the needle sleeve 1 where the second limiting part 12 is provided. The second limiting part 12 can limit the base 3 inside the needle sleeve 1 and prevent the base 3 from detaching from the needle sleeve 1.

[0074] Specifically, the front end of the second limiting part 12 is provided with an inlet ramp. When installing the base 3, the base 3 is inserted into the needle sleeve 1 from the front end. After the limiting platform 31 on the base 3 passes the inlet ramp, the rear end face of the second limiting part 12 can limit the limiting platform 31 to prevent the base 3 from detaching from the front end of the needle sleeve 1. At the same time, the first limiting part 11 can also limit the limiting platform 31 on the base 3 to prevent the base 3 from detaching from the rear end of the needle sleeve 1. Specifically, the setting of the needle sleeve deformation groove 161 not only facilitates assembly and allows the limiting platform 31 to enter the interior of the needle sleeve 1 from above, but also facilitates the injection molding of the needle sleeve 1.

[0075] In some embodiments, there can be multiple claws 32 on the base 3, such as at least three, with each claw 32 evenly distributed along the circumference of the base 3 to ensure the positional stability of the base 3. It should be noted that after the base 3 and the syringe 4 are assembled, the ends of the claws 32 of the base 3 should abut against the step 41, and the ends of the limiting platform 31 of the base 3 should be attached and fixed to the surface of the syringe 4 to ensure that the axial and radial directions of the base 3 are restricted, preventing the base 3 from shaking and thus ensuring the positional stability of the needle sheath 1.

[0076] In some embodiments, the base 3 and / or the needle sheath 1 are made of plastic. Plastic parts are low in cost, easy to process, and convenient to assemble. Specifically, the plastic parts are preferably made of resin materials commonly used in the medical industry and assembled together. The assembled product can be sterilized with ethylene oxide.

[0077] In some embodiments, the base 3, soft needle cap 2, and needle sheath 1 are pre-assembled as a protective assembly. Specifically, since the base 3 and the syringe 4 are limited by a locking claw 32, which can automatically reset under elastic deformation, the base 3, soft needle cap 2, and needle sheath 1 can be pre-assembled as a protective assembly. Then, the entire protective assembly can be installed into the syringe 4. During assembly, the base 3 and needle sheath 1 are simultaneously fixed to the syringe 4. By pre-assembling, the syringe 4 or the protective assembly can be produced separately, reducing assembly difficulty. In other words, two plastic parts, namely the base 3 and the needle sheath 1, and one rubber part, namely the soft needle cap 2, can form a unit, be sterilized, and then sold as a whole, improving market competitiveness. Specifically, the base 3 and the soft needle cap 2 can be assembled first, and then the base 3 and the soft needle cap 2 can be inserted into the needle sheath 1 to form a protective assembly. Alternatively, the needle sheath 1 can be placed on the syringe 4 from the front end to the rear end, and then the needle sheath 1 can be retracted to the retracted state. Then the base 3 can be installed on the syringe 4, the soft needle cap 2 can be installed, and then the needle sheath 1 can be moved forward to the initial state.

[0078] In some embodiments, the inner circumferential surface of the limiting platform 31 is a conical surface, and the outer circumferential surface of the assembly section of the syringe 4 is a cylindrical surface; or, the inner circumferential surface of the limiting platform 31 is a cylindrical surface, and the outer circumferential surface of the assembly section of the syringe 4 is a conical surface; or, both the inner circumferential surface of the limiting platform 31 and the outer circumferential surface of the assembly section of the syringe 4 are conical surfaces, and their tapers are different, so that the inner wall of the rear end of the limiting platform 31 is in line contact with the outer circumferential surface of the rear end of the assembly section; the assembly section of the syringe 4 refers to the section on the syringe 4 located between the round shoulder transition 43 and the step 41, and the base 3 is installed on the assembly section of the syringe 4; this arrangement is to ensure that when the claw 32 of the base 3 just abuts against the step 41, the inner wall of the front end of the limiting platform 31 abuts against the outer circumferential surface of the assembly section of the syringe 4, thereby achieving radial and axial limiting of the base 3. The above arrangement is to avoid assembly interference problems caused by machining errors, thereby ensuring the installation reliability and stability of the base 3. Preferably, the base 3 is integrally injection molded. In order to facilitate the molding of the base 3, the diameter of the inner circumferential surface of the limiting platform 31 gradually increases from one end near the claw 32 to the other end. That is, the inner circumferential surface of the limiting platform 31 should have a certain draft angle to facilitate demolding.

[0079] In some implementations, such as Figure 7-1 and Figure 7-2 As shown, the inner circumferential surface of the claw 32 is a conical surface. The diameter of the inner circumferential surface of the claw 32 gradually increases from one end away from the limiting platform 31 to the other end, and the taper of the inner circumferential surface of the claw 32 is greater than the taper of the outer circumferential surface of the assembly section of the syringe 4, so that a gap is formed between the inner wall of the claw 32 and the outer circumferential surface of the assembly section. Of course, the outer circumferential surface of the assembly section of the syringe 4 can also be a cylindrical surface. In order to match the structural design of the transition from the step 41 to the round shoulder 43, the outer circumferential surface of the assembly section of the syringe 4 is preferably a conical surface. The assembly section of the syringe 4 refers to the section on the syringe 4 located between the round shoulder transition 43 and the step 41. Similarly, the diameter of the inner circumferential surface of the claw 32 gradually increases from one end away from the limiting platform 31 to the other end, so that the inner circumferential surface of the claw 32 has a certain draft angle, which facilitates demolding. The above configuration, by creating a gap between the inner wall of the chuck 32 and the outer peripheral surface of the front end of the syringe 4, can reduce assembly interference problems caused by machining errors on the one hand, and provide a certain space for the movement of the chuck 32 on the other hand, thereby making the connection between the chuck 32 and the step 41 more reliable and improving stability.

[0080] Specifically, when the base 3 axially downwards fits onto the glass tube of the syringe 4, the jaws 32 of the base 3 elastically deform. After the base 3 moves axially to a certain position, the jaws 32 automatically rebound and lock onto the step 41 of the syringe 4 with a "click," preventing axial movement towards the front end. At this time, the lower part of the base 3, i.e., the inner circumference of the limiting platform 31 of the base 3, and the front conical surface of the syringe 4 are in line contact. The base 3 cannot move axially towards the rear end of the syringe 4, and there is no radial movement gap. With no axial movement and no radial movement, the connection between the base 3 and the syringe 4 is completed. In other words, the vertical distance between the line contact position of the front conical surface of the syringe 4 and the end face of the step 41 is consistent with the axial height of the base 3; the position where the front conical surface of the syringe 4 makes line contact with the base 3 is as follows: Figure 7-2 As shown in M, its diameter is the same as the inner circumference diameter of the end of the limiting platform 31 of the base 3.

[0081] Specifically, in one embodiment, the injection safety protection device includes a needle sheath 1, a soft needle cap 2, and a base 3. The base 3 is provided with a limiting platform 31 and a locking claw 32. The soft needle cap 2 is provided with a support platform 21. The needle sheath 1 is provided with a first limiting part 11, a second limiting part 12, a limiting arm 14, and a retaining ring 13. The installation and use of this injection safety protection device includes the following steps:

[0082] Before installing the base 3 and the soft needle cap 2, first slip the needle sheath 1 onto the front end of the syringe 4 and continue moving it backward until the second limiting part 12 of the needle sheath 1 moves to the rounded shoulder transition point 43 of the syringe 4. Under the action of the tapered part 16, the needle sheath 1 can only continue to move backward when force is applied. When there is no external force on the needle sheath 1, the tapered part 16 presses against the outer surface of the syringe 4 through elastic deformation, which can prevent the needle sheath 1 from sliding backward indefinitely. Then, install the base 3 on the assembly section of the syringe 4 and install the soft needle cap 2 on the front end of the syringe 4. The front end of the syringe 4 refers to the end near the needle tip 42. The soft needle cap 2 covers the needle tip 42 and wraps around the step 41 on the syringe 4. The soft needle cap 2 is stretched open by the step 41 and expands radially to ensure stability. The end of the soft needle cap 2 rests against the front end face of the limiting platform 31 of the base 3. The soft needle cap 2 can be removed but cannot continue to move backward. Move towards the rear end of the syringe 4; then move the needle sheath 1 forward, the second limiting part 12 on the needle sheath 1 passes over the limiting platform 31 of the base 3, and continue to move the needle sheath 1 until the first limiting part 11 abuts against the rear end face of the limiting platform 31 of the base 3. At this time, the retaining ring 13 abuts against the periphery of the recessed part 44, and the round shoulder transition part 43 can play a certain limiting role on the retaining ring 13, preventing the retaining ring 13 from moving towards the rear end of the syringe 4 without the action of external force, and ensuring that the needle sheath 1 is stably in the initial state; since the support platform 21 of the soft needle cap 2 will lift the limiting arm 14, the needle sheath 1 can move towards the rear end of the syringe 4 to the retracted state, and the retaining ring 13 is an elastic structure. When the needle sheath 1 is pushed towards the rear end of the syringe 4, that is, when the needle sheath 1 is pushed to the retracted state, the retaining ring 13 will open radially and cooperate with the rear end outer wall of the syringe 4 to ensure that the needle sheath 1 can move smoothly;

[0083] When the needle sheath 1 is in the retracted state, the soft needle cap 2 is removed for injection. After the injection is completed, the operator moves the needle sheath 1 toward the front end of the syringe 4. Since the soft needle cap 2 has been removed, when the needle sheath 1 moves toward the front end of the syringe 4 to the protective state, the limiting arm 14 of the needle sheath 1 will spring outward until the end of the limiting arm 14 abuts against the limiting platform 31 of the base 3. At this time, the first limiting part 11 and the limiting arm 14 simultaneously engage with the two axial ends of the limiting platform 31, and the retaining ring 13 abuts against the recessed part 44 radially again, thereby fixing the position of the needle sheath 1.

[0084] This injection safety protection device has a simple structure, high stability, convenient operation, few parts, and low production cost. It can effectively prevent the needle sheath 1 from swinging relative to the syringe barrel 4, making it convenient to pick up the syringe and ensuring the normal use of the needle sheath 1.

[0085] In addition to the aforementioned injection safety protection device, this utility model also provides a syringe including a syringe 4 and the aforementioned injection safety protection device. The syringe also includes a needle 42. For the structure of other parts of the syringe, please refer to relevant technologies, which will not be described in detail here.

[0086] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0087] The above provides a detailed description of the injection safety protection device provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An injection safety protection device, applied to a syringe (4), wherein a limiting platform (31) is provided at the front end of the syringe (4), and a recess (44) is formed between the rounded shoulder transition (43) of the syringe (4) and the limiting platform (31); characterized in that, Includes a needle sleeve (1), which is movably mounted on the syringe barrel (4). The needle sleeve (1) is provided with a first limiting part (11) and a second limiting part (12). The side wall of the needle sleeve (1) is also provided with a retaining ring (13), which is an elastic structure. When the needle sheath (1) is in the initial state or in the protective state to cover the needle (42) located on the syringe (4), the retaining ring (13) abuts against the periphery of the recess (44) along the radial direction of the syringe (4), and the first limiting part (11) is engaged with the limiting platform (31) along the axial direction of the syringe (4); when the needle sheath (1) is in the retracted state to release the needle (42), the second limiting part (12) is engaged with the limiting platform (31) along the axial direction of the syringe (4), and the retaining ring (13) abuts against the rear end sidewall of the syringe (4).

2. The safety protection device for injection according to claim 1, characterized in that, The needle sheath (1) is provided with a first clearance groove (101), and the retaining ring (13) is located in the first clearance groove (101). The shape of the retaining ring (13) is adapted to the structure of the round shoulder transition (43) of the syringe (4) so ​​that when the needle sheath (1) is in the initial state or the protective state, the retaining ring (13) fits against the round shoulder transition (43) of the syringe (4).

3. The safety protection device for injection according to claim 2, characterized in that, One end of the retaining ring (13) is fixed to the protective needle sleeve (1), and the other end edge is provided with an arc-shaped structure (133) with the same circumferential curvature as the recess (44); and / or, the left and right sides of the fixed end of the retaining ring (13) are provided with a first ring deformation groove (131), and the fixed end of the retaining ring (13) is provided with a second ring deformation groove (132) on the radially outer side.

4. The safety protection device for injection according to claim 1, characterized in that, The needle sheath (1) has a tapered portion (16) at one end away from the syringe (4), and the tapered portion (16) has a needle sheath deformation groove (161) so that the tapered portion (16) can expand or contract; the second limiting portion (12) is a second limiting boss provided on the inner wall of the tapered portion (16); when the needle sheath (1) is in the retracted state, the second limiting boss engages with the limiting platform (31) on one side of the needle tip (42) near the syringe (4).

5. The safety protection device for injection according to claim 1, characterized in that, The inner wall of the needle sheath (1) is also provided with a damping component (15). The damping component (15) is disposed adjacent to the second limiting part (12). When the needle sheath (1) moves to the retracted state, the damping component (15) passes over the limiting platform (31) and moves to the transition between the limiting platform (31) and the round shoulder (43).

6. The safety protection device for injection according to claim 1, characterized in that, The inner rear end of the needle sheath (1) is provided with a chamfer (17) so that a gap is formed between the rear end of the needle sheath (1) and the surface of the syringe (4).

7. The safety protection device for injection according to claim 1, characterized in that, It also includes a soft needle cap (2) for covering the needle tip (42), the soft needle cap (2) being detachably mounted on the syringe (4), and the soft needle cap (2) having a support platform (21); the needle sheath (1) also has a second clearance groove (102) and a limiting arm (14), the limiting arm (14) being suspended in the second clearance groove (102); Furthermore, when the needle sheath (1) is in the initial state, the limiting arm (14) abuts radially against the support platform (21), and the soft needle cap (2) covers the step (41) of the syringe (4); when the needle sheath (1) moves toward the first direction, the support platform (21) can lift the suspension end of the limiting arm (14) so ​​that the suspension end passes over the limiting platform (31); when the needle sheath (1) is in the protective state, the suspension end engages with the side of the limiting platform (31) near the needle tip (42).

8. The safety protection device for injection according to claim 7, characterized in that, The number of the limiting arms (14) and the number of the retaining rings (13) are both at least two. The limiting arms (14) and the retaining rings (13) are evenly distributed along the periphery of the needle sheath (1), and the limiting arms (14) and the retaining rings (13) are alternately distributed along the periphery of the needle sheath (1).

9. The safety protection device for injection according to claim 7, characterized in that, The suspension end of the limiting arm (14) has a plane that can abut against the axial front end face of the limiting platform (31). The inner side of the limiting arm (14) is provided with a first guide slope (141) and a second guide slope (142) that can cooperate with the limiting platform (31) for guidance. The first guide slope (141) and the second guide slope (142) are arranged along a first direction, and the inclination directions of the first guide slope (141) and the second guide slope (142) are opposite.

10. The safety protection device for injection according to any one of claims 1 to 9, characterized in that, Also includes: The base (3) and the syringe (4) are separate structures, and the base (3) can be sleeved on the front end of the syringe (4); The limiting platform (31) is located at one end of the base (3), and the other end of the base (3) is provided with a claw (32), which abuts against the step (41) of the syringe (4); The claw (32) is an elastic claw. When the base (3) is axially fitted with the syringe (4), the claw (32) of the base (3) undergoes elastic deformation so that the claw (32) automatically rebounds and engages with the step (41) end face of the syringe (4).

11. The safety protection device for injection according to claim 10, characterized in that, The inner circumferential surface of the limiting platform (31) is a conical surface, and the outer circumferential surface of the assembly section of the syringe (4) is a cylindrical surface; or, the inner circumferential surface of the limiting platform (31) is a cylindrical surface, and the outer circumferential surface of the assembly section of the syringe (4) is a conical surface; or, both the inner circumferential surface of the limiting platform (31) and the outer circumferential surface of the assembly section of the syringe (4) are conical surfaces, and the two have different tapers, so that the inner wall of the rear end of the limiting platform (31) is in line contact with the outer circumferential surface of the rear end of the assembly section. And / or, the inner circumferential surface of the claw (32) is a conical surface, the diameter of the inner circumferential surface of the claw (32) gradually increases from one end away from the limiting platform (31) to the other end, and the taper of the inner circumferential surface of the claw (32) is greater than the taper of the outer circumferential surface of the assembly section of the syringe (4), so that a gap is formed between the inner wall of the claw (32) and the outer circumferential surface of the assembly section; The assembly section of the syringe (4) refers to the section on the syringe (4) located between the round shoulder transition (43) and the step (41).

12. A syringe, comprising a syringe barrel (4) and an injection safety protection device, characterized in that, The injection safety protection device is the injection safety protection device according to any one of claims 1 to 11.

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