A rubber stopper for a pen-type injection device
By designing a cylindrical rubber stopper body, a conical pusher, and an anti-sticking ball for pen-type syringes, the problems of drug metering deviation and adhesion are solved, ensuring complete injection of the drug and improving sealing and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU BEST NEW MEDICAL MATERIAL CO LTD
- Filing Date
- 2025-03-06
- Publication Date
- 2026-06-23
Smart Images
Figure CN224387866U_ABST
Abstract
Description
Technical Field
[0001] This utility model specifically relates to the field of rubber stoppers for syringes, and more specifically to a rubber stopper for a portable pen-type syringe. Background Technology
[0002] Syringe stoppers are a crucial component widely used in the medical field, ensuring that medications or liquids inside the syringe do not leak. The stopper fits tightly against the syringe wall, forming an effective seal to prevent leakage during storage, transportation, and use, ensuring accurate dosage. When administering vaccines or other medications, the stopper's sealing performance ensures accurate dosage with each injection, preventing insufficient dosage or medication waste due to leakage. It also prevents external impurities, bacteria, and viruses from entering the syringe. As a barrier, the stopper prevents airborne microorganisms, dust, and other contaminants from entering the syringe, thus ensuring the purity and safety of the medication.
[0003] The rubber stoppers used in traditional syringes may adsorb components in the medication, causing deviations in dosage from the expected dose and affecting the therapeutic effect. During storage, the rubber stoppers may adsorb impurities from the environment, such as dust and microorganisms. If the surface treatment of the rubber stoppers is improper or the storage environment is poor during production, storage, and use, these impurities may be adsorbed and then introduced into the patient's body during injection, increasing the risk of infection.
[0004] A search revealed that Chinese Patent Publication No. CN202021621920.2 discloses a rubber stopper for a syringe; it includes a rubber stopper body, an opening on one side of the rubber stopper body, an internal thread I inside the opening, a rigid connecting sleeve inside the opening, an external thread on the surface of the rigid connecting sleeve, the external thread engaging with the internal thread I, an internal thread II on the inner wall of the rigid connecting sleeve, and a connecting adhesive between the rubber stopper body and the rigid connecting sleeve, the connecting adhesive being used to bond and fix the rubber stopper body and the rigid connecting sleeve;
[0005] When the rubber stopper in the aforementioned patent is used to inject the drug solution, the injector section comes into contact with the drug solution. The surface of the injector section is flat. As a result, after the drug solution is injected, the injector section may stick to the inner wall of the syringe. It may also cause the drug solution inside the syringe to not be fully injected, resulting in waste of drug solution. Utility Model Content
[0006] The purpose of this invention is to provide a convenient and portable rubber stopper for a pen-type syringe. In this structure, a pusher is provided in a conical shape at the end of the rubber stopper body. This effectively ensures that the pusher enters the infusion port at the end of the syringe during injection, so as to achieve complete injection of the drug solution. Multiple anti-sticking balls are also provided on the rubber stopper body to prevent the rubber stopper from sticking to the syringe after the drug solution is injected, thereby solving the problems mentioned in the background art.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A portable pen-type syringe stopper includes a stopper body that is cylindrical in shape, and a scraper is integrally formed on the edge of the side wall of the stopper body; the scraper and the side wall of the stopper body are chamfered.
[0009] One end of the rubber stopper body is integrally provided with a push post, which is conical in shape; multiple anti-stick balls are provided on the rubber stopper body at the edge of the push post.
[0010] As a further technical solution of this utility model, an inner ring is integrally provided on the inner wall of the rubber stopper body, and the inner ring is installed in conjunction with the plunger of the syringe.
[0011] As a further technical solution of this utility model, the rubber stopper body is made of high-quality halogenated butyl rubber; its components include: 60-110 parts of halogenated butyl rubber, 10-50 parts of maleic anhydride modified EPDM rubber, 20-80 parts of carbon black, 10-50 parts of heavy calcium carbonate, 10-40 parts of special resin, 0.5-2 parts of sulfur, 0.5-2 parts of zinc stearate, 0.5-2.5 parts of accelerator TMTD, 2-5 parts of zinc oxide, 1-5 parts of mixed dispersant, 1-5 parts of mixed antioxidant, and 5-20 parts of naphthenic oil;
[0012] As a further technical solution of this utility model, the temperature of the rubber stopper body is strictly controlled at 120℃-170℃ during the halogenation and sulfidation reactions.
[0013] As a further technical solution of this utility model, the edge diameter of the scraper is the same as the inner diameter of the syringe, and the push rod is matched with the liquid outlet on the syringe.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] 1. In use, the inner ring inside the rubber stopper body is installed in conjunction with the plunger of the syringe. By pulling and pushing the plunger, the rubber stopper body injects the medicine inside the syringe. While the rubber stopper body pushes the medicine, a scraper effectively scrapes away any residual medicine on the inner wall of the syringe, effectively preventing medicine residue. When injecting the medicine, the plunger enters the outlet at the end of the syringe, effectively ensuring that the medicine in the syringe is completely injected, avoiding the therapeutic effect of insufficient dosage.
[0016] 2. In this invention, after the drug injection is completed, the anti-stick ball at the end of the rubber stopper body contacts the inner wall of the syringe end. The anti-stick ball has a certain degree of contractility. Thus, after the drug injection is completed, the anti-stick ball separates from the inner wall through its own elastic rebound, effectively preventing the rubber stopper body from sticking to the syringe. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0018] Figure 2 This utility model Figure 1 Another perspective structural diagram.
[0019] Figure 3 This utility model Figure 1 Side view.
[0020] Figure 4 This utility model Figure 3 AA sectional view.
[0021] In the diagram: 1-Plug body, 2-Scraper strip, 3-Push post, 4-Anti-stick ball, 5-Inner ring. Detailed Implementation
[0022] 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.
[0023] Please see Figure 1-4 In this embodiment of the utility model, a portable pen-type syringe stopper includes a stopper body 1, which is cylindrical, and a scraper 2 is integrally provided on the side wall edge of the stopper body 1; the scraper 2 and the side wall of the stopper body 1 are chamfered.
[0024] The rubber stopper body 1 has a push post 3 integrally formed at one end, and the push post 3 is conical; multiple anti-stick balls 4 are provided on the rubber stopper body 1 at the edge of the push post 3.
[0025] The inner wall of the rubber stopper body 1 is integrally provided with an inner ring 5, which is installed in conjunction with the plunger of the syringe.
[0026] By adopting the above technical solution, in use, the inner ring 5 inside the rubber stopper body 1 is installed in conjunction with the plunger of the syringe. By pulling and pushing the plunger, the rubber stopper body 1 injects the medicine inside the syringe. While the rubber stopper body 1 pushes the medicine, the scraper 2 simultaneously scrapes away any residual medicine on the inner wall of the syringe, effectively avoiding any medicine residue. When injecting the medicine, the plunger 3 enters the outlet at the end of the syringe, effectively ensuring that the medicine in the syringe is completely injected, avoiding any impact on the therapeutic effect of the medicine due to insufficient dosage.
[0027] The rubber stopper body 1 is made of high-quality halogenated butyl rubber; its components include: 60-110 parts of halogenated butyl rubber, 10-50 parts of maleic anhydride modified EPDM rubber, 20-80 parts of carbon black, 10-50 parts of heavy calcium carbonate, 10-40 parts of special resin, 0.5-2 parts of sulfur, 0.5-2 parts of zinc stearate, 0.5-2.5 parts of accelerator TMTD, 2-5 parts of zinc oxide, 1-5 parts of mixed dispersant, 1-5 parts of mixed antioxidant, and 5-20 parts of naphthenic oil;
[0028] By adopting the above technical solution and mixing multiple materials, the effect of adsorbing the components in the liquid medicine when the rubber stopper body 1 comes into contact with the liquid medicine inside the syringe is effectively avoided. It also effectively improves the sealing performance of the rubber stopper body 1 and avoids leakage of the liquid medicine inside the syringe.
[0029] In this embodiment, the temperature of the rubber stopper body 1 is strictly controlled at 120℃-170℃ during the halogenation and sulfidation reactions;
[0030] The edge diameter of the scraper 2 is the same as the inner diameter of the syringe, and the pusher 3 is matched with the liquid outlet on the syringe;
[0031] By adopting the above technical solution, after the drug injection is completed, the anti-stick ball 4 at the end of the rubber stopper body 1 contacts the inner wall of the syringe end. The anti-stick ball 4 has a certain degree of contractility. In this way, after the drug injection is completed, the anti-stick ball 4 separates from the inner wall through its own elastic rebound, effectively avoiding the situation where the rubber stopper body 1 and the syringe stick together.
[0032] The working principle of this utility model is as follows: In use, the inner ring 5 inside the rubber stopper body 1 is installed in conjunction with the plunger of the syringe. By pulling and pushing the plunger, the rubber stopper body 1 injects the medicine inside the syringe. While the rubber stopper body 1 pushes the medicine, the scraper 2 simultaneously scrapes and picks up the residual medicine on the inner wall of the syringe, effectively avoiding the situation of medicine residue. When injecting the medicine, the plunger 3 enters the outlet at the end of the syringe, effectively realizing the complete injection of the medicine in the syringe, avoiding the influence of insufficient dosage on the therapeutic effect of the medicine.
[0033] After the drug injection is completed, the anti-stick ball 4 at the end of the rubber stopper body 1 comes into contact with the inner wall of the syringe end. The anti-stick ball 4 has a certain degree of contractility. After the drug injection is completed, the anti-stick ball 4 separates from the inner wall through its own elastic rebound, effectively preventing the rubber stopper body 1 from sticking to the syringe.
[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A portable rubber stopper for a pen-type syringe, characterized in that: Includes a rubber stopper body (1), which is cylindrical, and a scraper (2) is integrally provided on the side wall edge of the rubber stopper body (1); the scraper (2) and the side wall of the rubber stopper body (1) are chamfered. The rubber stopper body (1) has a push post (3) integrally formed at one end, and the push post (3) is conical; multiple anti-stick balls (4) are provided on the rubber stopper body (1) at the edge of the push post (3).
2. The rubber stopper for a portable pen-type syringe according to claim 1, characterized in that: The inner wall of the rubber stopper body (1) is integrally provided with an inner ring (5), which is installed in conjunction with the plunger of the syringe.
3. The rubber stopper for a portable pen-type syringe according to claim 2, characterized in that: The temperature of the rubber stopper body (1) during halogenation and sulfidation reactions is strictly controlled at 120℃-170℃.
4. The rubber stopper for a portable pen-type syringe according to claim 1, characterized in that: The edge diameter of the scraper (2) is the same as the inner diameter of the syringe, and the pusher (3) is matched with the liquid outlet on the syringe.