Disposable filter membrane syringe

Abstract

The invention discloses a disposable filter membrane injector, and belongs to medical instruments. The syringe comprises a needle head (1), an outer sleeve (2), a core rod (3), a piston (4), a filter membrane (5) and a filter membrane cavity (6). A filter membrane assembly is integrated at an outlet in the lower end of a piston in an outer sleeve of a traditional syringe, so that the technical problems that chippings and impurities enter liquid medicine due to the fact that the traditional syringe punctures a rubber plug, foreign matter, medicine crystals and floccules easily enter the body of a patient during liquid medicine preparation, intramuscular injection or intravenous injection, and risks are generated are solved. The filter membrane assembly is fixed to the bottom end of the inner wall of the outer sleeve (2) through ultrasonic welding or medical adhesive bonding, a filter structure is formed, and rubber plug chippings, glass particles, medicine crystals and impurities can be filtered bidirectionally in the suction stage and the injection stage. According to the invention, the scrap filtering efficiency is obviously improved, the residual quantity of liquid medicine is reduced, and the injection safety is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the category of medical devices, and specifically relates to a disposable syringe with a filter membrane structure, which is suitable for clinical liquid preparation and injection scenarios. Background Art

[0002] The structure of a traditional disposable syringe includes a needle, a jacket, a piston, and a core rod. During the preparation process, when the syringe needle punctures the drug bottle stopper, it is easy for rubber stopper fragments to fall into the drug solution. In addition, most infusion bottles have a layer of sealed plastic under the rubber stopper, which is relatively brittle. During the puncture process, plastic fragments are also easy to fall into the infusion bottle. In addition, when medical staff break open the ampoule, it is also easy for glass fragments to fall into the drug solution. When using traditional disposable syringes to prepare liquids, there is a risk of rubber stopper / plastic / glass fragments entering the patient's body when performing intramuscular or intravenous injections. In the clinical treatment process, intravenous injections often require the use of a syringe pump for long-term slow injection treatment. During this process, drugs are prone to crystallization or floccules. The use of traditional disposable syringes may cause the risk of drug crystallization or floccules entering the human body. Therefore, there is an urgent need for a disposable syringe with an integrated filtering function to avoid the above-mentioned medication risks. Summary of the Invention

[0003] Technical issues The technical problem to be solved by the present invention is the risk of rubber stopper / plastic / glass fragments, undissolved drug particles and impurities entering the human body during the preparation or injection process of traditional disposable syringes. At the same time, the present invention can fully stir the liquid during the preparation process to accelerate the dissolution rate of the drug.

[0004] Technical Solution A disposable membrane filter syringe is designed. Its structure includes a needle, outer sleeve, piston, core rod, filter membrane, and membrane cavity. The filter membrane is located within the membrane cavity to form a filter assembly. The filter assembly is located at the bottom of the inner wall of the outer sleeve, covering the flow path of the drug solution. The filter assembly is fixed to the bottom of the inner wall of the outer sleeve by ultrasonic welding or medical adhesive to form the filtration structure. The filter membrane is made of medical-grade polyethersulfone (PES), polytetrafluoroethylene (PTFE), or nylon, with a pore size of 0.2-5μm. The outer end of the core rod is designed with a non-slip ring surface at the finger injection point to enhance the pressure of the syringe.

[0005] In a preferred embodiment of the present invention, the filter membrane material is preferably medical polyethersulfone (PES), and the pore size is preferably 0.22 μm.

[0006] Technical Effects The above-mentioned technical solution tightly connects the membrane assembly to the bottom of the inner wall of the outer jacket, achieving integrated drug filtration and injection. This approach features a simple structure, low cost, and safety and reliability. The structural design requires that the membrane assembly cover the drug flow path, ensuring bidirectional filtration and adequate agitation of the drug solution during the aspiration or injection phases of the preparation or injection process. This removes rubber plug / plastic / glass debris, undissolved drug particles, and impurities from the drug solution, reducing clinical medication risks. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be further described below with reference to the accompanying drawings. Figure 1 It is a structural schematic diagram of a disposable filter membrane syringe according to an embodiment of the present invention, including an enlarged view of the overall structure and the filter assembly, showing the assembly details of the filter membrane and the filter membrane cavity. Figure 2 It is the overall structure of the disposable membrane filter syringe and its disassembled details, showing the overall structure of the disposable membrane filter syringe, the outer sleeve connecting the membrane assembly and the core rod structural schematic and top view. DETAILED DESCRIPTION

[0007] The present invention will be further described below with reference to the accompanying drawings.

[0008] like Figure 1 As shown, a disposable filter membrane syringe comprises a needle (1), an outer sleeve (2), a core rod (3), a piston (4), a filter membrane (5), and a filter membrane cavity (6). The characteristics of the syringe are that the filter membrane (5) is located in the filter membrane cavity (6) to form a filter assembly, the filter assembly is located at the bottom end of the inner wall of the outer sleeve (2), and the filter membrane assembly covers the flow path of the liquid medicine, and is used to bidirectionally filter out the rubber plug / plastic / glass debris, undissolved drug particles and impurities generated during the dispensing puncture process during the suction and injection stages.

[0009] The filter membrane assembly is fixed to the bottom end of the inner wall of the outer shell (2) by ultrasonic welding or medical adhesive bonding to form a filter structure.

[0010] The surface of the finger push injection area at the outer end of the core rod (3) is provided with a ring pattern, which has an anti-slip effect.

[0011] Nano silver coating can be sprayed on the surface of the filter membrane (5) to effectively inhibit bacteria.

Claims

1. A disposable filter membrane syringe, comprising a needle (1), an outer sleeve (2), a core rod (3), a piston (4), a filter membrane (5), and a filter membrane cavity (6). The characteristics are: The filter membrane (5) is located in the filter membrane cavity (6) to form a filter assembly. The filter assembly is located at the bottom end of the inner wall of the outer shell (2). The filter membrane assembly covers the flow path of the liquid medicine and is used to filter out the rubber plug / plastic / glass debris, undissolved drug particles and impurities generated during the dispensing puncture process in both the suction and injection stages.

2. The disposable filter membrane syringe according to claim 1, characterized in that: The filter membrane assembly is fixed to the bottom end of the inner wall of the outer shell (2) by ultrasonic welding or medical adhesive bonding to form a filter structure.

3. The disposable filter membrane syringe according to claim 1, characterized in that: The filter membrane (5) is made of medical polyethersulfone (PES), polytetrafluoroethylene (PTFE) or nylon, and has a pore size of 0.2-5 μm, preferably 0.22 μm.

4. The disposable filter membrane syringe according to claim 1, characterized in that: The surface of the finger push injection area at the outer end of the core rod (3) is provided with anti-slip ring patterns.

5. The disposable filter membrane syringe according to any one of claims 1 to 4, characterized in that: Disposable design, overall sterile sealed packaging.

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