Injection device with protection mechanism
By designing an injection device with a protective mechanism, utilizing the bayonet and guide groove structure of the bracket and outer shell, the safety device can be manually activated to retract the needle into the outer shell, solving the problems of easy loss and puncture wounds of existing syringe needle sheaths, and achieving safe and reliable needle protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DOLPHIN MEDICAL TECHNOLOGY (SUZHOU) CO LTD
- Filing Date
- 2025-03-03
- Publication Date
- 2026-07-21
AI Technical Summary
Existing disposable syringes are prone to losing their needle caps after use, and there is a risk of pricking fingers when re-capping them, leading to infection risks.
Design an injection device with a protective mechanism, including a support and a housing. By manually activating the safety device, the needle retracts into the housing. The bracket and housing utilize a bayonet and guide groove structure to ensure safe retraction of the needle and avoid puncture wounds.
It achieves automatic needle retraction after injection, reducing the risk of user injury. The structure is simple and reliable, and easy to produce and operate.
Smart Images
Figure CN224523731U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of injection technology, specifically relating to an injection device with a protective mechanism. Background Technology
[0002] A disposable syringe is a single-use medical device used to inject liquid medications. It is typically made of plastic and includes a needle, plunger, and barrel to ensure sterile use and reduce the risk of cross-infection.
[0003] Existing disposable syringes are typically recapped after use to prevent needle pricks and potential infections. However, in practice, the small cap is easily lost, and recapping can also cause finger pricks. Therefore, a new type of injection device with a protective mechanism is needed. Utility Model Content
[0004] To address the aforementioned problems, this utility model discloses an injection device with a protective mechanism.
[0005] To achieve the above objectives, the technical solution of this utility model is as follows:
[0006] An injection device with a protective mechanism includes a syringe, characterized in that a bracket is coaxially fixedly sleeved on the syringe, and an outer shell is coaxially sleeved on the bracket; the bracket handle of the bracket extends into a plurality of syringe fixing arms coaxial with the syringe, and the claws of each syringe fixing arm are adapted to engage the protrusions on the edge of the syringe barrel; the cylindrical end of the bracket is provided with two elastic arms coaxial with the syringe; the end of the outer shell away from the bracket handle is provided with a fixing slot adapted to the protrusions of the elastic arms, and the end of the outer shell near the bracket handle is provided with an elastic slot adapted to the protrusions of the elastic arms; the inner wall of the outer shell is provided with guide grooves adapted to the sliding of the protrusions of the elastic arms, and both guide grooves extend to terminate at the elastic slots.
[0007] As a preferred technical solution of this utility model, the elastic bayonet is provided with a spring piece adapted to the protrusion of the elastic arm.
[0008] As a preferred embodiment of this utility model, the outer shell extends out two guide rails that are adapted to the square holes of the insert bracket handle.
[0009] As a preferred embodiment of this utility model, the side of the syringe fixing arm away from the support handle is an arc-shaped spring piece, and each end of the arc-shaped spring piece side of the syringe fixing arm is provided with a claw that adapts to the protrusion of the syringe edge.
[0010] As a preferred embodiment of this utility model, the outer shell is a transparent outer shell, and the bracket is made of transparent material.
[0011] As a preferred technical solution of this utility model, the outer shell is a hollow outer shell, and both the hollow outer shell and the bracket are provided with through grooves that expose the syringe scale.
[0012] The beneficial effects of this utility model are as follows:
[0013] I. This application does not use the spring-activated device in traditional safety devices. The safety device is manually activated after injection to protect the user from needle pricks. The structure is simple and reliable, easy to manufacture and assemble, and suitable as a disposable syringe.
[0014] Second, when manually activated, under the guidance of the guide rail and guide groove, the elastic arm protrusion slides into the elastic slot in a straight line along the guide groove, with smooth sliding and no deviation, which facilitates operation. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure before excitation in Embodiment 1 of this utility model;
[0016] Figure 2 This is a schematic diagram of the structure after excitation in Embodiment 1 of this utility model;
[0017] Figure 3 This is a cross-sectional view of Embodiment 1 of the present invention after excitation;
[0018] Figure 4 This is a schematic diagram of the structure of the bracket according to Embodiment 1 of this utility model;
[0019] Figure 5 This is a schematic diagram of the structure of the transparent outer shell in Embodiment 1 of this utility model;
[0020] Figure 6 This is a schematic diagram of the structure before activation in Embodiment 2 of this utility model.
[0021] List of identifiers in attached diagrams:
[0022] 11. Transparent outer shell; 12. Perforated outer shell;
[0023] 101. Fixed bayonet; 102. Flexible bayonet; 103. Guide rail; 104. Guide groove;
[0024] 2. Support; 201. Elastic arm; 202. Support handle; 203. Syringe fixing arm;
[0025] 3. Syringe; 301. Needle; 302. Push rod; 303. Needle. Detailed Implementation
[0026] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0027] Please see Figure 1-6
[0028] Example 1
[0029] An injection device with a protective mechanism includes a syringe 3, with a bracket 2 coaxially fixedly fitted around the syringe 3. The bracket 2 is made of transparent material. A transparent outer shell 11 is coaxially fitted around the bracket 2. The use of the liquid in the syringe 301 can be observed through the transparent outer shell 11 and the bracket 2. The outer wall of the transparent outer shell 11 has anti-slip grooves or an outer anti-slip ring for easy gripping.
[0030] The support handle 202 of the support 2 extends into several syringe fixing arms 203 coaxial with the syringe 3, and the claws of each syringe fixing arm 203 are adapted to engage the edge protrusion of the syringe barrel 301 of the syringe 3. In this embodiment, two syringe fixing arms 203 are provided. The cylindrical end of the support 2 is provided with two elastic arms 201 coaxial with the syringe 3. The end of the transparent outer shell 11 away from the support handle 202 is provided with a fixing slot 101 adapted to the protrusion of the elastic arm 201, and the end of the transparent outer shell 11 near the support handle 202 is provided with an elastic slot 102 adapted to the protrusion of the elastic arm 201. The inner wall of the transparent outer shell 11 is provided with guide grooves 104 adapted to the sliding of the protrusion of the elastic arm 201, and both guide grooves 104 extend to terminate at the elastic slots 102.
[0031] The elastic latch 102 is equipped with a spring piece that adapts to the protrusion of the elastic arm 201. When the protrusion of the elastic arm 201 moves and engages with the elastic latch 102, the spring piece inside the elastic latch 102 first undergoes elastic deformation and then returns to its original shape, so that the protrusion of the elastic arm 201 is jointly held by the transparent outer shell 11 and the spring piece inside the elastic latch 102. The wall thickness of the portion of the transparent outer shell 11 that holds the protrusion of the elastic arm 201 is greater than the portion of the transparent outer shell 11 that is farther away from the elastic latch 102, making it difficult for the protrusion of the elastic arm 201 to move towards the guide rail 103 after being jointly held by the transparent outer shell 11 and the spring piece inside the elastic latch 102.
[0032] The transparent outer shell 11 extends out two guide rails 103 that fit into the square holes of the bracket handle 202. Before excitation in this embodiment, the guide rails 103 are inserted into the square holes of the bracket handle 202 to make the transparent outer shell 11 and the bracket 2 stably assembled. During excitation in this embodiment, under the guidance of the guide rails 103 and the guide groove 104, the protrusion of the elastic arm 201 slides straight into the elastic slot 102 along the guide groove 104. The protrusion of the elastic arm 201 is provided with a chamfer or rounded corner to facilitate movement in the excitation direction.
[0033] The syringe fixing arm 203 has an arc-shaped spring on the side away from the support handle 202, and each end of the arc-shaped spring side of the syringe fixing arm 203 is provided with a claw that adapts to the protrusion on the edge of the syringe 301. When the syringe 3 is coaxially installed on the support 2, the protrusion on the edge of the syringe 301 compresses the arc-shaped spring, causing it to elastically form. After the syringe 301 is compressed to the installation position, the arc-shaped spring returns to its original shape, and the claw of the arc-shaped spring locks the protrusion on the edge of the syringe 301.
[0034] The syringe 3 consists of a syringe barrel 301, a plunger 302, and a needle 303, and the syringe barrel 301 is fitted with a needle sleeve that is compatible with the needle 303 (not shown in the attached figure).
[0035] Working principle:
[0036] During use, the needle sheath of the needle 303 is removed for injection. After injection, the transparent outer shell 11 and the bracket 2 are held respectively, and the transparent outer shell 11 is pulled toward the needle 303, so that the needle 303 retracts into the transparent outer shell 11, reducing the probability of the needle 303 pricking the user. In this embodiment, the elastic arm 201 protrusion is inserted into the fixed slot 101 before activation. After the transparent outer shell 11 is pulled, the elastic arm 201 undergoes elastic deformation, and the elastic arm 201 protrusion disengages from the fixed slot 101 and slides straight into the elastic slot 102 along the guide groove 104. Finally, the elastic arm 201 protrusion is fixed in the elastic slot 102, and the needle 303 remains in the state of retracting into the transparent outer shell 11.
[0037] Example 2
[0038] In this embodiment, the structure of the injection device is basically the same as that in Embodiment 1, except that:
[0039] In Embodiment 1, the transparent outer shell 11 is replaced with a hollow outer shell 12, and both the hollow outer shell 12 and the bracket 2 are provided with through grooves that expose the scale of the syringe 301, so as to observe the use of the medicine liquid in the syringe 301.
[0040] Working principle:
[0041] In this embodiment, the working principle of the injection device is basically the same as that in Embodiment 1, except that:
[0042] When observing the use of the medicine solution inside the syringe 301, the observation is made through the through grooves of the hollow outer shell 12 and the support 2.
[0043] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.
Claims
1. An injection device with a protective mechanism, comprising a syringe (3), characterized in that, The syringe (3) is coaxially fixedly fitted with a bracket (2), and the bracket (2) is coaxially fitted with an outer shell; the bracket handle (202) of the bracket (2) extends into several syringe fixing arms (203) coaxial with the syringe (3), and the claws of each syringe fixing arm (203) are adapted to engage the edge protrusion of the syringe barrel (301) of the syringe (3); the cylindrical end of the bracket (2) is provided with two elastic arms coaxial with the syringe (3). (201) The outer shell is provided with a fixing slot (101) adapted to the protrusion of the elastic arm (201) at one end away from the support handle (202), and an elastic slot (102) adapted to the protrusion of the elastic arm (201) at one end of the outer shell near the support handle (202). The inner wall of the outer shell is provided with a guide groove (104) adapted to the sliding of the protrusion of the elastic arm (201), and both guide grooves (104) extend to terminate at the elastic slot (102).
2. The injection device with a protective mechanism according to claim 1, characterized in that, The elastic latch (102) is provided with a spring piece that adapts to the protrusion of the elastic arm (201).
3. The injection device with a protective mechanism according to claim 1, characterized in that, The outer casing extends into two guide rails (103) that fit into the square holes of the insert bracket handle (202).
4. The injection device with a protective mechanism according to claim 1, characterized in that, The side of the syringe fixing arm (203) away from the support handle (202) is an arc-shaped spring, and each end of the arc-shaped spring side of the syringe fixing arm (203) is provided with a claw that adapts to the protrusion of the edge of the syringe (301).
5. An injection device with a protective mechanism according to claim 1, characterized in that, The outer shell is a transparent outer shell (11), and the bracket (2) is made of transparent material.
6. An injection device with a protective mechanism according to claim 1, characterized in that, The outer shell is a hollow outer shell (12), and both the hollow outer shell (12) and the bracket (2) are provided with through slots that expose the scale of the syringe (301).