A removable plunger structure for a syringe
By employing threaded connectors, threaded holes, and snap-fit components in the syringe, a detachable connection between the plunger and piston is achieved, solving the problem of existing syringes being difficult to disassemble and improving the efficiency of medical waste disposal and transportation safety.
Patent Information
- Application Number
- CN202522238241.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-23
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-10-23
AI Technical Summary
The plunger and piston of existing syringes are difficult to disassemble, resulting in high medical waste disposal costs and the plunger being prone to breakage during transportation, affecting safety.
The design of threaded joints and threaded holes allows for detachable connection of the push rod and piston. The push rod can be detached and sorted for recycling through snap-fit components and storage components. The push rod can be removed during transportation to avoid breakage.
It enables convenient disassembly and sorting of push rods and pistons, reduces medical waste disposal costs, improves transportation safety, and avoids the risk of push rod breakage.
Smart Images
Figure CN224937454U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a detachable plunger structure for a syringe. Background Technology
[0002] As a commonly used medical device, syringes are widely used in medical injections, vaccinations, and other scenarios. Their core structure includes a syringe barrel, a plunger, and a piston. The plunger pushes the piston to move inside the syringe to extract and inject the medication.
[0003] Existing syringes require sorting and disposal as medical waste after use. The integrated plunger, piston, and syringe are difficult to disassemble, increasing the manpower and time costs of medical waste disposal. Therefore, a detachable plunger structure for syringes is provided. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a detachable plunger structure for syringes, achieving both detachability and transport protection: the plunger and piston are screwed into a threaded hole via a threaded joint, and the detachable connection facilitates sorting and recycling after use; after the pre-filled syringe is filled with the liquid medicine, the plunger can be removed, preventing the plunger from breaking during transportation due to its excessive length, thus improving transportation safety, reducing transportation damage, and overcoming the shortcomings of existing technologies.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: A detachable plunger structure for a syringe includes a tube body and a plunger. A piston is movably inserted into the tube body. One end of the plunger is provided with a threaded connector. A threaded hole is provided in the middle of one side of the piston to form a threaded engagement with the threaded connector. The other end of the plunger is provided with a push plate. A snap-fit assembly is provided on the outer wall of the plunger. A storage assembly is provided on the outer wall of the tube body.
[0006] As a further improvement of this utility model: the outer wall of the push rod is provided with structural reinforcing fins at equal intervals, and the structural reinforcing fins, the push rod, and the push rod are integrally formed.
[0007] As a further improvement of this utility model: the closed end of the tube is provided with a liquid outlet, and the outside of the liquid outlet is fitted with a dirt-proof sleeve.
[0008] As a further improvement of this invention, a sealing ring is provided on the outer wall of the piston.
[0009] As a further improvement of this utility model, two auxiliary ear plates are symmetrically arranged on the outer wall of the open end of the tube.
[0010] As a further embodiment of this utility model: the snap-fit assembly includes two connecting rods fixed to the outer wall of the push rod, and the ends of the two connecting rods away from the push rod are connected to snap-fit rods.
[0011] As a further embodiment of this utility model: the storage component includes a fixing seat disposed on the outer wall of the tube, two elastic blocks are disposed at the top of the fixing seat, a slot is disposed between the two elastic blocks, and a gap is disposed between the tops of the two elastic blocks.
[0012] As a further improvement of this utility model, the locking rod and the locking groove form a locking engagement.
[0013] The beneficial effects of this utility model are as follows: 1. Achieve detachable design and transport protection: The push rod and piston are screwed into the threaded hole via a threaded joint, which allows for detachable connection and easy recycling after use; after the pre-filled syringe is filled with the drug solution, the push rod can be removed to prevent it from breaking during transportation due to its overall length, thereby improving transportation safety and reducing damage during transport.
[0014] 2. After the push rod is separated from the tube body, the push rod's locking rod can be inserted into the locking groove through the locking gap of the two elastic locking blocks, so that the push rod is connected to the outside of the tube body, preventing the two from being damaged by friction during transportation. Attached Figure Description
[0015] Figure 1 This is a first-view three-dimensional structural diagram of a detachable plunger structure for a syringe proposed in this utility model.
[0016] Figure 2 This is a second-view three-dimensional structural diagram of a detachable plunger structure for a syringe proposed in this utility model.
[0017] Figure 3 This is a schematic diagram showing the disassembled push rod structure for a syringe proposed in this utility model.
[0018] Figure 4 This utility model proposes a detachable plunger structure for a syringe. Figure 2 Enlarged diagram of point A in the middle.
[0019] Figure 5 This utility model proposes a detachable plunger structure for a syringe. Figure 3 Enlarged structural diagram at point B.
[0020] In the diagram: 1. Tube body; 2. Dispensing nozzle; 3. Fixing seat; 4. Push plate; 5. Push rod; 6. Anti-fouling sleeve; 7. Structural reinforcing fin plate; 8. Clamping rod; 9. Threaded joint; 10. Auxiliary ear plate; 11. Piston; 12. Threaded hole; 13. Sealing ring; 14. Connecting rod; 15. Elastic locking block; 16. Locking groove. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0022] Example 1, referring to Figure 1-5 A detachable plunger structure for a syringe includes a tube body 1 and a plunger 5. A piston 11 is movably inserted into the tube body 1. One end of the plunger 5 is provided with a threaded connector 9. A threaded hole 12 is provided in the middle of one side of the piston 11 to form a threaded engagement with the threaded connector 9. The other end of the plunger 5 is provided with a push plate 4. A snap-fit assembly is provided on the outer wall of the plunger 5. A storage assembly is provided on the outer wall of the tube body 1.
[0023] The outer wall of the push rod 5 is provided with structural reinforcing fins 7 at equal intervals, and the structural reinforcing fins 7, the push rod 5 and the push rod 5 are integrally formed.
[0024] The closed end of the tube body 1 is provided with a liquid outlet 2, and the outside of the liquid outlet 2 is fitted with a dirt-proof sleeve 6.
[0025] The outer wall of the piston 11 is provided with a sealing ring 13, and two auxiliary lugs 10 are symmetrically arranged on the outer wall of the open end of the tube body 1.
[0026] The threaded connector 9 and the threaded hole 12 are screwed together to enable the detachable connection between the push rod 5 and the piston 11, which facilitates the sorting and recycling of the syringe after use. Furthermore, for pre-filled syringes, after the liquid is packaged, part of the plunger 5 is located outside the tube 1. The overall length of the syringe is relatively long, so the plunger 5 can be directly twisted and removed, avoiding the situation where the plunger 5 breaks during transportation due to the overall length of the syringe, thus improving transportation safety and reducing transportation damage.
[0027] Example 2 is an optimization based on Example 1, specifically: The snap-fit assembly includes two connecting rods 14 fixed to the outer wall of the push rod 5, and a snap-fit rod 8 is connected to the end of the two connecting rods 14 away from the push rod 5.
[0028] The storage component includes a fixing seat 3 set on the outer wall of the tube body 1. The top of the fixing seat 3 is provided with two elastic locking blocks 15. A locking groove 16 is provided between the two elastic locking blocks 15, and a locking gap is provided between the tops of the two elastic locking blocks 15. The locking rod 8 and the locking groove 16 form a locking engagement.
[0029] After the push rod 5 is separated from the tube body 1, the snap-fit rod 8 on the push rod 5 can be snapped into the slot 16 through the snap-fit gap of the two elastic snap-fit blocks 15, so that the push rod 5 is connected to the outside of the tube body 1, avoiding damage to the push rod 5 due to friction with the tube body 1 during transportation.
[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A detachable plunger structure for a syringe, comprising a tube body (1) and a plunger (5), characterized in that, A piston (11) is movably inserted into the tube body (1). One end of the push rod (5) is provided with a threaded joint (9). A threaded hole (12) is provided in the middle of one side of the piston (11) to form a threaded engagement with the threaded joint (9). A push plate (4) is provided at the other end of the push rod (5). A snap-fit assembly is provided on the outer wall of the push rod (5). A storage assembly is provided on the outer wall of the tube body (1).
2. The detachable plunger structure for a syringe according to claim 1, characterized in that, The outer wall of the push rod (5) is provided with structural reinforcing fins (7) at equal intervals, and the structural reinforcing fins (7), the push rod (5) and the push rod (5) are integrally formed.
3. The detachable plunger structure for a syringe according to claim 2, characterized in that, The closed end of the tube (1) is provided with a liquid outlet (2), and the outside of the liquid outlet (2) is covered with a dirt-proof sleeve (6).
4. The detachable plunger structure for a syringe according to claim 1, characterized in that, The piston (11) has a sealing ring (13) on its outer wall.
5. A detachable plunger structure for a syringe according to claim 1, characterized in that, Two auxiliary ear plates (10) are symmetrically arranged on the outer wall of the open end of the tube (1).
6. The detachable plunger structure for a syringe according to claim 1, characterized in that, The snap-fit assembly includes two connecting rods (14) fixed to the outer wall of the push rod (5), and a snap-fit rod (8) is connected to one end of the two connecting rods (14) away from the push rod (5).
7. A detachable plunger structure for a syringe according to claim 6, characterized in that, The storage component includes a fixing seat (3) set on the outer wall of the tube body (1). The top of the fixing seat (3) is provided with two elastic blocks (15), a slot (16) is provided between the two elastic blocks (15), and a slot is provided between the tops of the two elastic blocks (15).
8. A detachable plunger structure for a syringe according to claim 7, characterized in that, The snap-fit rod (8) and the snap-fit groove (16) form a snap-fit engagement.