Locking and unlocking structure of reusable injector auxiliary device

Abstract

The utility model discloses a reusable locking and unlocking structure of an injector auxiliary device, which comprises an auxiliary device shell, a locking and unlocking mechanism and a locking and unlocking mechanism, the auxiliary device shell is hollow, one end of the auxiliary device shell is internally provided with a groove, and the other end of the auxiliary device shell is in threaded connection (or buckled connection) with an injection auxiliary device shell; the neck bush is embedded in the slightly-ranked side of the assistor shell, one end of the neck bush is meshed with the groove in the assistor shell, and a buckle elastic wall is arranged on the neck bush; the needle withdrawing piece is arranged in the shell, one end of the needle withdrawing piece abuts against the injector, the neck bush is arranged outside the needle withdrawing piece in a sleeving mode, a buckle platform is arranged on the needle withdrawing piece, and the buckle platform can be embedded into the buckle elastic wall; the pressing rod is arranged in the needle withdrawing piece and used for pushing a syringe piston, a clamping block is arranged at the end, arranged in the needle withdrawing piece, of the pressing rod and used for preventing the pressing rod from being disengaged, and a release boss is arranged on the pressing rod and used for separating the buckle platform of the needle withdrawing piece and the buckle elastic wall of the neck bush when the buckle platform of the needle withdrawing piece and the buckle elastic wall of the neck bush are embedded.

Description

Technical Field

[0001] The utility model relates to the technical field of medical treatment, in particular to a locking and unlocking structure of a reusable syringe auxiliary device. Background Art

[0002] Traditional syringes require the drug solution to be drawn out of the bottle before injection. This method makes it difficult to control the amount of drug solution used during the patient's self-injection. There is a prefilled syringe in the prior art, such as a prefilled syringe auxiliary propulsion device disclosed in patent CN213698342U. When the structure disclosed in this application is in a locked state, the card-in part is easily disengaged when it is subjected to the force of the needle withdrawal spring, and the syringe cannot be locked in the injection state.

[0003] To this end, the utility model provides a locking and unlocking structure of a reusable syringe auxiliary device to solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that when the auxiliary injection structure in the prior art is in a locked state, the card-in part is easily disengaged when subjected to the action of the spring force, and the syringe cannot be locked in the injection state.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A locking and unlocking structure of a reusable syringe auxiliary device, comprising:

[0007] An auxiliary device housing, wherein the interior of the auxiliary device housing is hollow, a groove is provided inside one end of the auxiliary device housing, and the other end is threadedly connected or snap-connected to the injection auxiliary device housing;

[0008] An inner sleeve, the inner sleeve is embedded in the inner part of the flared side of the auxiliary device housing, one end of the inner sleeve is engaged with the inner groove of the auxiliary device housing, and a snap-on elastic wall is provided on the inner sleeve;

[0009] A needle withdrawal member, wherein one end of the needle withdrawal member is arranged inside the housing and contacts the syringe, the inner sleeve is sleeved on the outside of the needle withdrawal member, and a buckle platform is arranged on the needle withdrawal member, and the buckle platform can be engaged with the buckle elastic wall;

[0010] A pressing rod is arranged in the needle withdrawal piece and is used to push the syringe piston. A blocking block is arranged at one end of the pressing rod arranged in the needle withdrawal piece to prevent the pressing rod from falling out. A releasing boss is arranged on the pressing rod to separate the locking platform of the needle withdrawal piece and the locking spring wall when the two are engaged.

[0011] Furthermore, the end of the auxiliary device shell away from the injection auxiliary device shell is slightly flared; the inner sleeve is slightly flared, and a protrusion is provided on the smaller end, which is adapted to the auxiliary device shell; the release boss can be engaged with the groove in the snap platform.

[0012] Furthermore, a fixing block is arranged in the auxiliary device housing; a protrusion which can be engaged and installed with the fixing block is arranged at one end of the inner bushing; and the needle withdrawal member is engaged and fixedly installed with the pressing rod.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The automatic needle withdrawal structure of the prefilled syringe auxiliary device can effectively avoid the risk of secondary puncture caused by operational errors when the patient removes the needle after the injection, and the needle tube can be withdrawn into the injection device after the injection. Compared with the prior art, the buckle spring walls of the present application are all set inward, and the syringe needle remains in the injection locking state before the injection is completed. After the injection is completed, the needle is pulled out and the needle is withdrawn by pulling the pressing rod, so as to avoid the spring rebounding too quickly during injection, causing the needle to retract and affect the injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the disassembled structure of the inner liner in the first embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the needle withdrawal member and the pressing rod in the first embodiment of the utility model;

[0018] Figure 4 This is a schematic diagram of the partial structure of the first embodiment of the utility model before locking;

[0019] Figure 5 This is a schematic diagram of the local structure after locking of the first embodiment of the utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0021] Figure 7 This is a schematic diagram of the disassembled structure of the inner liner in the second embodiment of the utility model;

[0022] Figure 8 This is a schematic diagram of the structure of the needle withdrawal member and the pressing rod in the second embodiment of the utility model;

[0023] Fig. 9 This is a schematic diagram of the partial structure of the second embodiment of the utility model before locking;

[0024] Fig.10 This is a schematic diagram of the partial structure of the second embodiment of the utility model when locked;

[0025] Fig.11 It is a schematic diagram of the partial structure of the second embodiment of the utility model when unlocking.

[0026] In the figure: 1. auxiliary device housing; 2. inner sleeve; 201. snap-on spring wall; 3. needle withdrawal member; 301. snap-on platform; 4. pressing rod; 401. release boss. DETAILED DESCRIPTION

[0027] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented by one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0028] The applicant believes that when the auxiliary injection structure in the prior art is in the locked state, the locking piece is easily disengaged when subjected to the spring force, and the syringe cannot be locked in the injection state.

[0029] To this end, the applicant designed Figure 1-11 A locking and unlocking structure of a reusable syringe auxiliary device is shown, comprising:

[0030] The auxiliary device housing 1 is hollow inside, a groove is arranged inside one end of the auxiliary device housing 1, and the other end is threadedly connected or snap-fitted to the injection auxiliary device housing 1;

[0031] The inner sleeve 2 is embedded in the inner part of the flared side of the auxiliary device housing 1, one end of the inner sleeve 2 is engaged with the inner groove of the auxiliary device housing 1, and a snap-on elastic wall 201 is provided on the inner sleeve 2;

[0032] The needle withdrawal member 3 is arranged inside the housing at one end thereof and contacts the syringe. The inner sleeve 2 is sleeved on the outside of the needle withdrawal member 3. The needle withdrawal member 3 is provided with a buckle platform 301, which can be engaged with the buckle elastic wall 201.

[0033] The pressing rod 4 is arranged in the needle withdrawal member 3 and is used to push the syringe piston. A clamping block is arranged at one end of the pressing rod 4 arranged in the needle withdrawal member 3 to prevent the pressing rod 4 from falling out. A releasing boss 401 is arranged on the pressing rod 4 to separate the buckle platform 301 of the needle withdrawal member 3 and the buckle spring wall 201 when the two are engaged. Example

[0034] like Figure 1-5As shown, the locking and unlocking structure of the reusable syringe auxiliary device of this embodiment, the end of the auxiliary device shell 1 away from the injection auxiliary device shell 1 is slightly flared; the inner sleeve 2 is slightly flared, and a protrusion is provided at the smaller end, and the protrusion is adapted to the auxiliary device shell 1; the release boss 401 can be engaged with the groove in the snap platform 301. Example

[0035] like Figure 6-11 As shown, the locking and unlocking structure of the reusable syringe auxiliary device of this embodiment has a fixing block arranged in the auxiliary device housing 1; a protrusion which can be engaged and installed with the fixing block is arranged at one end of the inner sleeve 2; and the needle withdrawal member 3 is engaged and fixedly installed with the pressing rod 4.

[0036] Working principle: after the user threadably or snap-fits the locking and unlocking device to the injection aid, the needle withdrawal member 3 is snap-fitted and fixed with the inner sleeve 2 to achieve locking. Then the needle is pulled out and the pressing rod 4 is continued to be pushed so that the release boss 401 of the pressing rod 4 contacts the snap-fit ​​spring wall 201 of the inner sleeve 2 to stretch it open. At the same time, the spring in the injection aid bounces the needle withdrawal member 3 back to the initial position to complete the unlocking. The internal structure of the injection aid is similar to the principle structure disclosed in patent CN213698342U, so this application no longer includes drawings or excessive descriptions.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A locking and unlocking structure of a reusable syringe auxiliary device, characterized in that: include: An auxiliary device shell (1), the interior of the auxiliary device shell (1) is hollow, and a groove is provided inside one end of the auxiliary device shell (1); An inner sleeve (2), the inner sleeve (2) being embedded in the inner part of the slightly flared side of the auxiliary device housing (1), one end of which is engaged with the inner groove of the auxiliary device housing (1), and a snap-on elastic wall (201) is provided on the inner sleeve (2); A needle withdrawal member (3), wherein the needle withdrawal member (3) is arranged at one end inside the housing and contacts the syringe, the inner sleeve (2) is sleeved on the outside of the needle withdrawal member (3), and a buckle platform (301) is arranged on the needle withdrawal member (3), and the buckle platform (301) can be engaged with the buckle elastic wall (201); A pressing rod (4), the pressing rod (4) being arranged in the needle withdrawal member (3) and being used to push the syringe piston, one end of the pressing rod (4) being arranged in the needle withdrawal member (3) being provided with a block for preventing the pressing rod (4) from coming out, and a releasing boss (401) being provided on the pressing rod (4) for separating the buckle platform (301) of the needle withdrawal member (3) and the buckle elastic wall (201) when the two are engaged.

2. The locking and unlocking structure of a reusable syringe auxiliary device according to claim 1, characterized in that: The end of the auxiliary device shell (1) away from the injection auxiliary device shell (1) is slightly flared; the inner sleeve (2) is slightly flared, and the smaller end is provided with a protrusion, which is compatible with the auxiliary device shell (1); the release boss (401) can be engaged with the groove in the snap platform (301).

3. The locking and unlocking structure of a reusable syringe auxiliary device according to claim 1, characterized in that: A fixing block is arranged in the auxiliary device housing (1); a protrusion capable of being engaged and installed with the fixing block is arranged at one end of the inner bushing (2); and the needle withdrawal member (3) is engaged and fixedly installed with the pressing rod (4).

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