Safety protection apparatus for injection and syringe

Abstract

A safety protection apparatus for injection and a syringe. The safety protection apparatus for injection comprises: a base, capable of sleeving a needle cylinder, a limiting table being arranged at one end of the base, a clamping jaw being arranged at the other end of the base, and the clamping jaw abutting against a step; and a sleeve, movably mounted on the needle cylinder, a first limiting part and a second limiting part being arranged on the sleeve. When the sleeve is in an initial state or a protective state to shield a needle head, the first limiting part is snap-fitted to the limiting table, and when the sleeve is in a retracted state to release the needle head, the second limiting part is snap-fitted to the limiting table. According to the safety protection apparatus for injection provided by the present application, by means of the arrangement of the base and the sleeve and the arrangement of the limiting table on the base, limitation of the sleeve in the initial state, the protective state, and the retracted state is achieved; by means of the split arrangement of the base and the needle cylinder, the base can be conveniently machined; by means of the arrangement of the clamping jaw, the base and the needle cylinder are assembled more conveniently, the assembly efficiency is high, and installment is firm.

Description

Safety protection device for injection and syringe

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 5, 2024, with application number 202420419079.0 and invention name “A safety protection device and syringe for injection”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of syringe equipment, and in particular to a safety protection device and a syringe for injection. Background Art

[0003] Currently, prefilled syringes need to be recycled after use, and the exposed needle poses a risk to both patients and medical staff. Inserting the needle back into the protective cap can easily puncture the rubber inner core, making the entire process very difficult.

[0004] To protect the needle and reduce the risk of injury to workers, existing pre-filled protective devices typically use a sleeve. During use, the sleeve is retracted into the syringe, exposing the needle. After use, the sleeve is extended to block the needle, preventing it from being exposed. However, existing pre-filled protective devices often require user assembly, resulting in bulky packaging, space consuming shipping, and high processing costs. Furthermore, the numerous components significantly increase the risk of failure.

[0005] Therefore, how to improve the ease of use of injection safety protection devices and reduce costs is a technical problem that those skilled in the art currently need to solve.

[0006] Application Contents

[0007] The purpose of this application is to provide a safety protection device and syringe for injection, which can reduce production costs, facilitate operation and have high stability.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] A safety protection device for injection, applied to a syringe, wherein the front end of the syringe is provided with a step; comprising:

[0010] A base can be sleeved on the syringe, and one end of the base is provided with a limit platform, and the other end is provided with a claw, and the claw abuts against the step;

[0011] The sleeve is movably mounted on the syringe, and is provided with a first limiting portion and a second limiting portion; when the sleeve is in an initial state or a protective state to cover the needle, the first limiting portion is engaged with the limiting platform, and when the sleeve is in a retracted state to release the needle, the second limiting portion is engaged with the limiting platform.

[0012] Preferably, the sleeve is further provided with a limiting arm, and when the sleeve moves toward the second direction, the suspended end of the limiting arm can pass over the limiting platform, or be engaged with the second side of the limiting platform.

[0013] Preferably, it further includes a soft needle cap for covering the needle head, the soft needle cap is detachably mounted on the syringe, and a support platform is provided on the soft needle cap, which can lift the suspended end of the limit arm so that the suspended end passes over the limit platform when the sleeve moves toward the second direction.

[0014] Preferably, the base, the soft needle cap and the sleeve are preassembled into a protective assembly.

[0015] Preferably, a damping component is further provided on the inner wall of the sleeve, and the damping component is arranged close to the second limiting portion. When the sleeve is in the retracted state, the damping component is in contact with the surface of the syringe.

[0016] Preferably, the base and / or the sleeve are made of plastic.

[0017] Preferably, the second limiting portion is an internal thread provided inside the sleeve; the limiting platform is provided with an external thread, and the internal thread and the external thread can be tightened and fixed.

[0018] Preferably, the inner circumference of the limiting platform is a conical surface, and the taper of the inner circumference of the limiting platform is different from the taper of the front end outer circumference of the syringe, so that the outer end of the inner wall of the limiting platform is in line contact with the front end outer circumference of the syringe.

[0019] Preferably, the inner circumferential surface of the clamping jaw is a conical surface, and the diameter of the inner circumferential surface of the clamping jaw gradually increases from one end away from the limit platform to the other end, and the taper of the inner circumferential surface of the clamping jaw is greater than the conical surface of the front end outer circumferential surface of the syringe, so that a gap is formed between the inner wall of the clamping jaw and the front end outer circumferential surface of the syringe.

[0020] The present application also provides a syringe comprising any one of the above-mentioned safety protection devices for injection.

[0021] The injection safety protection device provided in the present application is applied to a syringe, and a step is provided at the front end of the syringe; it includes: a base, which can be sleeved on the syringe, and a limit platform is provided at one end of the base, and a claw is provided at the other end, and the claw abuts against the step; a sleeve, movably mounted on the syringe, and a first limit part and a second limit part are provided on the sleeve; when the sleeve is in the initial state or the protective state to cover the needle, the first limit part is engaged with the limit platform, and when the sleeve is in the retracted state to release the needle, the second limit part is engaged with the limit platform. The injection safety protection device provided in the present application realizes the limitation of the sleeve in the initial state, protection state and recovery state by setting the base and the sleeve and setting the limit platform on the base. The separate setting of the base and the syringe can facilitate the processing of the base, and the material of the base can be selected to be processed with a material with lower cost than that of the syringe, thereby reducing the processing cost. Moreover, through the setting of the claws, the assembly of the base and the syringe is more convenient, the assembly efficiency is high, and the installation is firm.

[0022] The syringe provided in the present application is provided with the above-mentioned injection safety protection device. Since the injection safety protection device has the above-mentioned technical effects, the syringe provided with the injection safety protection device should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] FIG1 is a schematic diagram of the exploded structure of a specific embodiment of the injection safety protection device provided in this application;

[0025] FIG2-1 is a schematic diagram of the structure of the injection safety protection device provided in this application in the initial state;

[0026] Figure 2-2 is an enlarged schematic diagram of structure A shown in Figure 2-1;

[0027] Figure 3-1 is a schematic diagram of the injection safety protection device provided in this application in a recovered state;

[0028] FIG3-2 is a schematic cross-sectional view of the injection safety protection device shown in FIG3-1 taken along line AA;

[0029] Figure 3-3 is an enlarged schematic diagram of structure B shown in Figure 3-2;

[0030] Figure 4-1 is a schematic diagram of the injection safety protection device provided in this application in the protection state;

[0031] FIG4-2 is a schematic cross-sectional view of the injection safety protection device shown in FIG4-1 taken along line BB;

[0032] Figure 4-3 is an enlarged schematic diagram of the C structure shown in Figure 4-2;

[0033] FIG5-1 is a left side view of the sleeve in the injection safety protection device shown in FIG1;

[0034] FIG5-2 is a CC cross-sectional view of the sleeve shown in FIG5-1;

[0035] FIG6-1 is a front view of the sleeve of the injection safety protection device shown in FIG1;

[0036] Figure 6-2 is a schematic DD cross-sectional view of the sleeve shown in Figure 6-1;

[0037] FIG7-1 is an assembly diagram of the syringe and base of the injection safety protection device shown in FIG1;

[0038] Figure 7-2 is an enlarged schematic diagram of the D structure shown in Figure 7-1;

[0039] Among them: sleeve 1; first limiting portion 11; second limiting portion 12; limiting arm 13; damping component 14; soft needle cap 2; support platform 21; notch 22; base 3; limiting platform 31; claw 32; syringe 4; step 41; needle 42. DETAILED DESCRIPTION

[0040] The core of this application is to provide a safety protection device and syringe for injection, which can ensure reliability while reducing the manufacturing difficulty and cost as much as possible.

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] Please refer to Figures 1 to 7-2, Figure 1 is a schematic diagram of the decomposed structure of a specific embodiment of the injection safety protection device provided by the present application; Figure 2-1 is a schematic diagram of the structure of the injection safety protection device provided by the present application in the initial state; Figure 2-2 is an enlarged schematic diagram of the A structure shown in Figure 2-1; Figure 3-1 is a schematic diagram of the injection safety protection device provided by the present application in the recovered state; Figure 3-2 is a schematic diagram of the AA cross-section of the injection safety protection device shown in Figure 3-1; Figure 3-3 is an enlarged schematic diagram of the B structure shown in Figure 3-2; Figure 4-1 is a schematic diagram of the injection safety protection device provided by the present application in the Schematic diagram of the protection state; Figure 4-2 is a BB cross-sectional diagram of the injection safety protection device shown in Figure 4-1; Figure 4-3 is an enlarged schematic diagram of the C structure shown in Figure 4-2; Figure 5-1 is a left view of the sleeve in the injection safety protection device shown in Figure 1; Figure 5-2 is a CC cross-sectional diagram of the sleeve shown in Figure 5-1; Figure 6-1 is a main view of the sleeve in the injection safety protection device shown in Figure 1; Figure 6-2 is a DD cross-sectional diagram of the sleeve shown in Figure 6-1; Figure 7-1 is an assembly diagram of the syringe and the base in the injection safety protection device shown in Figure 1; Figure 7-2 is an enlarged schematic diagram of the D structure shown in Figure 7-1.

[0043] In this embodiment, the injection safety protection device is applied to the syringe 4, and a step 41 is provided at the front end of the syringe 4; it includes: a base 3, which can be sleeved on the syringe 4, and a limit platform 31 is provided at one end of the base 3, and a claw 32 is provided at the other end, and the claw 32 abuts against the step 41; a sleeve 1, movably mounted on the syringe 4, and a first limit portion 11 and a second limit portion 12 are provided on the sleeve 1; when the sleeve 1 is in the initial state or the protective state to cover the needle 42, the first limit portion 11 is engaged with the limit platform 31, and when the sleeve 1 is in the recovery state to release the needle 42, the second limit portion 12 is engaged with the limit platform 31.

[0044] Specifically, the function of the injection safety protection device is to prevent the needle 42 from being exposed and reduce personal injury to the user; the base 3 plays a limiting role. By installing the base 3 on the syringe 4, the position of the sleeve 1 is limited to ensure the position stability of the sleeve 1 in different states; specifically, when the sleeve 1 is in the initial state, as shown in Figures 2-1 and 2-2, it is the state after the injection safety protection device is assembled with the syringe 4. At this time, the sleeve 1 blocks the needle 42, which is convenient for transportation and taking. When in use, the sleeve 1 needs to be pulled in a first direction away from the needle 42. The first direction is the direction indicated by the arrow in Figure 2-1, so that the sleeve 1 enters a recovery state, as shown in Figures 3-1 to 3-3. At this time, the needle 42 is exposed, which is convenient for injection. After the injection is completed, the sleeve 1 is returned to the initial position again. At this time, the needle 42 is in a protective state, as shown in Figures 4-1 to 4-3. The needle 42 is no longer in use, and the sleeve 1 can prevent the needle 42 from hurting the user.

[0045] Furthermore, there can be multiple claws 32 on the base 3, which are preferably evenly distributed around the limit platform 31 of the base 3 to ensure the position stability of the base 3. It should be noted that after the base 3 and the syringe 4 are assembled, the end of the claw 32 of the base 3 should abut against the step 41, and the end of the limit platform 31 of the base 3 should be fitted and fixed to the surface of the syringe 4 to ensure that the axial and radial directions of the base 3 are restricted to avoid shaking of the base 3, thereby ensuring the position stability of the sleeve 1.

[0046] Furthermore, the first limiting portion 11 and the second limiting portion 12 of the sleeve 1 can be structures such as a buckle, a clamping arm or a limiting boss. If the above structure is adopted, when the sleeve 1 is in the initial state or the protective state to cover the needle 42, the first limiting portion 11 is clamped with the first side of the limiting platform 31, and when the sleeve 1 is in the retracted state to release the needle 42, the second limiting portion 12 is clamped with the second side of the limiting platform 31; the first side of the limiting platform 31 is the side of the limiting platform 31 away from the needle 42, and the second side of the limiting platform 31 is the side of the limiting platform 31 close to the needle 42.

[0047] In one embodiment, in order to ensure that the sleeve 1 does not shake when in the protective state, the first limiting portion 11 and the limiting platform 31 are preferably threadedly connected, and the first limiting portion 11 and the limiting platform 31 can be fastened, that is, the first limiting portion 11 and the limiting platform 31 have different pitches, which can ensure that the first limiting platform 31 is better threadedly fastened to the limiting platform 31. When the position of the sleeve 1 needs to be changed, the first limiting portion 11 and the limiting platform 31 can be separated by twisting;

[0048] Similarly, in order to ensure that the sleeve 1 does not shake when it is in the recovered state, the second limit portion 12 and the limit platform 31 are also preferably threadedly connected, that is, the second limit portion 12 is an internal thread arranged inside the sleeve 1, and the limit platform 31 is provided with an external thread, and the internal thread and the external thread can be tightened and fixed; and the second limit portion 12 and the limit platform 31 can be tightened, that is, the second limit portion 12 and the limit platform 31 have different pitches, which can ensure that the second limit platform 31 is better threadedly tightened with the limit platform 31. When the position of the sleeve 1 needs to be changed, just twist and separate the second limit portion 12 and the limit platform 31.

[0049] The injection safety protection device provided in the present application is configured with a base 3 and a sleeve 1, and a limit platform 31 is provided on the base 3 to limit the sleeve 1 in the initial state, protection state and recovery state. The separate configuration 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 processed with a material with lower cost than that of the syringe 4, thereby reducing the processing cost. Moreover, the configuration of the claw 32 makes the assembly of the base 3 and the syringe 4 more convenient, the assembly efficiency is high, and the installation is firm.

[0050] In some embodiments, as shown in Figures 5-1 to 6-2, a limit arm 13 is further provided on the sleeve 1. When the sleeve 1 moves in the second direction, the suspended end of the limit arm 13 can pass over the limit platform 31 or engage with the second side of the limit platform 31; the second direction is opposite to the first direction. Specifically, the configuration of the limit arm 13 forms a protrusion inside the sleeve 1 in the initial state. When supported by an external force, the limit arm 13 can swing until it is flush with the inner wall of the sleeve 1. At this time, the limit arm 13 does not play a restrictive role. When the sleeve 1 is in the initial state, the first limit portion 11 is engaged with the limit platform 31. When the sleeve 1 needs to be recovered, the limit arm 13 is swung at least flush with the inner wall of the sleeve 1 by external force. At this time, the sleeve 1 can be smoothly recovered to the recovery state until the second limit portion 12 is engaged with the limit platform 31 to prevent the sleeve 1 from continuing to be recovered. Then, when the sleeve 1 is extended to the protective state again, the contact is restricted to the limit arm 13. The limit arm 13 will be engaged with the limit platform 31 under the action of elastic force. At this time, the first limit portion 11 and the limit arm 13 are respectively engaged with the left and right sides of the limit platform 31, thereby ensuring that the sleeve 1 is stably locked in the position of the limit platform 31 and cannot move, thereby achieving the protection purpose.

[0051] Preferably, the suspended end of the limit arm 13 has a plane that can abut against the end face of the limit platform 31, and a boss is provided on the inner wall of the limit arm 13. Guide slopes are provided on both sides of the boss to ensure that the limit arm 13 smoothly passes over the limit platform 31.

[0052] In some embodiments, a soft needle cap 2 for covering the needle 42 is further included. The soft needle cap 2 is detachably mounted on the syringe 4. A support platform 21 is provided on the soft needle cap 2. The support platform 21 can lift the suspended end of the limit arm 13 so that when the sleeve 1 moves in the second direction, the suspended end passes over the limit platform 31. The support platform 21 matches the size of the limit portion so that the first limit arm 13 can pass over the limit portion when the sleeve 1 is retracted. Specifically, the support platform 21 cooperates with the guide bevel. When the sleeve 1 moves toward the rear end of the syringe 4, the support platform 21 will support the limit arm 13, so that the limit arm 13 swings toward the outside of the sleeve 1 until the boss on the limit arm 13 smoothly passes over the limit platform 31. After the injection is completed, since the soft needle cap 2 is removed at this time, the support platform 21 no longer works. When the sleeve 1 moves toward the front end of the syringe 4, the limit arm 13 will pass over the limit platform 31 again under the action of the guide bevel. Then, under the elastic deformation of the limit arm 13, the end face of the suspended end of the limit arm 13 will fit with the end face of the limit platform 31 to achieve a snap connection. 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.

[0053] 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 close to the syringe 4 to avoid the second limiting portion 12 structure of the sleeve 1.

[0054] In some embodiments, the base 3, the soft needle cap 2, and the sleeve 1 are pre-assembled into a protective component. Specifically, since the base 3 and the syringe 4 are limited by the claw 32, the claw 32 can automatically reset under the action of elastic deformation. Therefore, the base 3, the soft needle cap 2, and the sleeve 1 can be pre-assembled into a protective component, and then the entire protective component can be installed into the syringe 4. During assembly, the base 3 and the sleeve 1 will be fixed to the syringe 4 at the same time; through pre-assembly, the syringe 4 or the protective component can be produced separately, reducing the difficulty of assembly. In other words, two plastic parts, namely the base 3 and the sleeve 1, and a rubber part, namely the soft needle cap 2, can be combined into a unit, sterilized, and sold as a whole to improve market competitiveness.

[0055] In some embodiments, a damping component 14 is further provided on the inner wall of the sleeve 1. The damping component 14 is provided near the second limiting portion 12. When the sleeve 1 is in the retracted state, the damping component 14 is in contact with the surface of the syringe 4. Specifically, the damping component 14 is preferably made of rubber. The provision of the damping component 14 can prevent the sleeve 1 from sliding toward the front end of the syringe 4 when in the retracted state, thereby ensuring a smooth injection process.

[0056] In some embodiments, the first limiting portion 11 and / or the second limiting portion 12 is a limiting boss, and an introduction bevel is provided on one side of the limiting boss of the first limiting portion 11. Specifically, the introduction bevel of the first limiting portion 11 is located on the side away from the second limiting portion 12, so that when the sleeve 1 is inserted into the syringe 4, the introduction bevel first cooperates with the limiting platform 31 until the end face of the limiting boss of the first limiting portion 11 is engaged with the end face of the limiting platform 31, so that the sleeve 1 cannot move toward the front end of the syringe 4. The end face of the limiting boss of the second limiting portion 12 faces the first limiting portion 11, ensuring that when the sleeve 1 is in the retracted state, the sleeve 1 will not continue to move toward the rear end of the syringe 4.

[0057] In some embodiments, the base 3 and / or sleeve 1 are made of plastic, which are low-cost, easy to process, and convenient to assemble. Specifically, the plastic parts are preferably made of resin materials commonly used in the traditional medical industry, and are assembled and used together in a sterile environment. The assembled product can be sterilized with ethylene oxide.

[0058] In some embodiments, a chamfer is provided on the inner side of the rear end of the sleeve 1 to prevent the label scale paper on the syringe 4 from being torn off.

[0059] In some embodiments, the inner circumference of the limiting platform 31 is a conical surface, and the taper of the inner circumference of the limiting platform 31 is different from the taper of the front end outer circumference of the syringe 4, so that the outer end of the inner wall of the limiting platform 31 is in line contact with the front end outer circumference of the syringe 4. This arrangement is to ensure that when the claw 32 of the base 3 just abuts the step 41, the outer end of the inner wall of the limiting platform 31 abuts with the front end outer circumference of the syringe 4, thereby achieving radial and axial limitation of the base 3. The above arrangement is to avoid assembly interference problems caused by processing errors, thereby ensuring the installation reliability and stability of the base 3. Preferably, the base 3 is integrally cast. In order to facilitate the molding of the base 3, the inner circumference of the limiting platform 31 gradually increases in diameter from one end close to the claw 32 to the other end, that is, the inner circumference of the limiting platform 31 should have a certain draft angle to facilitate demolding.

[0060] In some embodiments, as shown in Figures 7-1 and 7-2, the inner circumference of the claw 32 is a conical surface, and the diameter of the inner circumference of the claw 32 gradually increases from one end away from the limit platform 31 to the other end, and the taper of the inner circumference of the claw 32 is greater than the taper of the front end outer circumference of the syringe 4, so that a gap is formed between the inner wall of the claw 32 and the front end outer circumference of the syringe 4. Similarly, the inner circumference of the claw 32 gradually increases from one end away from the limit platform 31 to the other end in order to provide the inner circumference of the claw 32 with a certain draft angle, which facilitates demoulding. The above arrangement, by forming a gap between the inner wall of the claw 32 and the front end outer circumference of the syringe 4, can, on the one hand, reduce assembly interference problems caused by processing errors, and on the other hand, provide a certain space for the movement of the claw 32, thereby making the connection between the claw 32 and the step 41 more secure and improving stability.

[0061] Specifically, when the base 3 is axially downwardly fitted with the glass tube of the syringe 4, the claw 32 of the base 3 undergoes elastic deformation. After the base 3 moves axially to a certain position, the claw 32 automatically rebounds and is stuck on the step 41 of the syringe 4. After a "click", it cannot move axially toward the front end. At this time, the lower end of the base 3, that is, the inner circumferential end of the limit platform 31 of the base 3 and the front end conical surface of the syringe 4 are in line contact. The base 3 cannot move axially toward the rear end of the syringe 4, and there is no radial play. There is no axial play and no radial play, completing the connection between the base 3 and the syringe 4. In other words, the vertical distance between the position where the front end conical surface of the syringe 4 is in line contact with the end face of the step 41 is consistent with the axial height of the base 3. The position where the front end conical surface of the syringe 4 is in line contact with the base 3 is shown as M in Figure 7-2, and its diameter is the same as the inner circumferential diameter of the end of the limit platform 31 of the base 3.

[0062] Specifically, in a specific embodiment, the injection safety protection device includes a sleeve 1, a soft needle cap 2, and a base 3. The base 3 is provided with a limit platform 31 and a clamping claw 32. The soft needle cap 2 is provided with a support platform 21. The sleeve 1 is provided with a first limit portion 11, a second limit portion 12, and a limit arm 13. The use process of the injection safety protection device includes the following steps:

[0063] The base 3 is installed at the front end of the syringe 4, and the front end of the syringe 4 refers to the end close to the needle 42; the soft needle cap 2 is installed at the front end of the syringe 4 to cover the needle 42. The soft needle cap 2 is stretched open by the syringe 4, and the end of the soft needle cap 2 is pressed against the end surface of the limit platform 31 of the base 3. The soft needle cap 2 can be removed but cannot continue to move toward the rear end of the syringe 4; then the sleeve 1 is installed on the syringe 4 until the first limit portion 11 of the sleeve 1 is engaged with the limit platform 31 of the base 3; because the support platform 21 of the soft needle cap 2 will push up the limit arm 13, the sleeve 1 can move toward the rear end of the syringe 4 to a recovery state;

[0064] Remove the soft needle cap 2 to perform the injection. After the injection is completed, the sleeve 1 moves toward the front end of the syringe 4. Since the soft needle cap 2 has been removed, when the sleeve 1 moves toward the front end of the syringe 4 to the protective state, the limit arm 13 of the sleeve 1 will pop out until the end of the limit arm 13 abuts against the limit platform 31 of the base 3. At this time, the first limit portion 11 and the limit arm 13 are simultaneously engaged with the left and right sides of the limit platform 31 to fix the position of the sleeve 1.

[0065] The injection safety protection device has a simple structure, high stability, easy operation, few parts and low production cost.

[0066] In addition to the above-mentioned safety protection device for injection, the present application also provides a syringe including the above-mentioned safety protection device for injection. For the structure of other parts of the syringe, please refer to the prior art and will not be described in detail herein.

[0067] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0068] The above is a detailed introduction to the injection safety protection device provided by this application. Specific examples are used herein to illustrate the principles and implementation methods of this application. The description of the above examples is intended only to facilitate understanding of the method and core concept of this application. It should be noted that those skilled in the art may make various improvements and modifications to this application without departing from the principles of this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A safety protection device for injection, applied to a syringe (4), wherein a step (41) is provided at the front end of the syringe (4); characterized in that: include: A base (3) can be sleeved on the needle cylinder (4), and one end of the base (3) is provided with a limit platform (31), and the other end is provided with a claw (32), and the claw (32) abuts against the step (41); A sleeve (1) is movably mounted on the syringe (4), and a first limiting portion (11) and a second limiting portion (12) are provided on the sleeve (1); when the sleeve (1) is in an initial state or a protective state to shield the needle (42), the first limiting portion (11) is engaged with the limiting platform (31); when the sleeve (1) is in a retracted state to release the needle (42), the second limiting portion (12) is engaged with the limiting platform (31).

2. The safety protection device for injection according to claim 1, characterized in that: The sleeve (1) is further provided with a limiting arm (13). When the sleeve (1) moves toward the second direction, the suspended end of the limiting arm (13) can pass over the limiting platform (31), or be engaged with a side of the limiting platform (31) close to the needle (42).

3. The safety protection device for injection according to claim 2, characterized in that: The invention also includes a soft needle cap (2) for covering the needle head (42), wherein the soft needle cap (2) is detachably mounted on the syringe (4), and a support platform (21) is provided on the soft needle cap (2), wherein the support platform (21) can lift the suspension end of the limiting arm (13) so that the suspension end passes over the limiting platform (31) when the sleeve (1) moves toward the second direction.

4. The safety protection device for injection according to claim 3, characterized in that: The base (3), the soft needle cap (2) and the sleeve (1) are pre-assembled into a protective component.

5. The safety protection device for injection according to claim 1, characterized in that: A damping component (14) is also provided on the inner wall of the sleeve (1), and the damping component (14) is arranged close to the second limiting portion (12). When the sleeve (1) is in the recovery state, the damping component (14) is in contact with the surface of the limiting platform (31) installed on the syringe (4).

6. The safety protection device for injection according to claim 1, characterized in that: The base (3) and / or the sleeve (1) are plastic parts.

7. The safety protection device for injection according to any one of claims 1 to 6, characterized in that: The second limiting portion (12) is a limiting boss, and the limiting boss is engaged with the outer surface of the limiting platform (31); or the second limiting portion (12) is an internal thread arranged inside the sleeve (1); the limiting platform (31) is provided with an external thread, and the internal thread and the external thread can be tightened and fixed.

8. The safety protection device for injection according to any one of claims 1 to 6, characterized in that: The inner circumference of the limiting platform (31) is a conical surface, and the taper of the inner circumference of the limiting platform (31) is different from the taper of the outer circumference of the front end of the syringe (4), so that the outer end of the inner wall of the limiting platform (31) is in line contact with the outer circumference of the front end of the syringe (4).

9. The safety protection device for injection according to any one of claims 1 to 6, characterized in that: The inner circumference of the clamping claw (32) is a conical surface, and the diameter of the inner circumference of the clamping claw (32) gradually increases from one end away from the limiting platform (31) to the other end, and the taper of the inner circumference of the clamping claw (32) is greater than the taper of the outer circumference of the front end of the syringe (4), so that a gap is formed between the inner wall of the clamping claw (32) and the outer circumference of the front end of the syringe (4).

10. The safety protection device for injection according to any one of claims 1 to 6, characterized in that: When the base (3) is axially fitted onto the syringe (4), the clamping claw (32) of the base (3) undergoes elastic deformation. After the base (3) moves axially to a certain position, the clamping claw (32) automatically rebounds and is clamped on the step (41) of the syringe (4).

11. A syringe comprising 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 10.

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