Precise filtering injector

Abstract

The invention belongs to the field of medical injectors, and particularly relates to a precise filtering injector which is characterized in that a filter valve is arranged at the top in an outer cylinder; the filter valve comprises a valve body, a liquid inlet one-way valve core, a filter membrane and a liquid outlet valve core; the valve body is fixed at the top in the outer cylinder and is provided with an elastic valve plate at the bottom; the liquid inlet one-way valve element is installed in the valve body, a liquid inlet channel is formed in the liquid inlet one-way valve element, and the elastic valve block plugs the liquid inlet channel from the lower portion. The liquid outlet valve core and the filter membrane are mounted in a mounting groove in the upper end surface of the liquid inlet one-way valve core; the liquid outlet valve element comprises an elastic element body provided with a liquid outlet channel and a gland, the gland blocks the liquid outlet channel from the lower portion, and a liquid outlet hole is formed in the gland. And the filter membrane is pressed and fixed by an upper gland. When liquid medicine is extracted, the elastic valve plate deforms downwards, the liquid inlet gap is opened, and the liquid medicine enters the injector through the liquid inlet channel; when liquid medicine is pushed and injected, the elastic core body deforms upwards, the liquid outlet gap is opened, particles in the liquid medicine are filtered through the filtering membrane, the filtered liquid medicine is output through the liquid outlet channel, and potential safety hazards are eliminated.

Description

Technical Field

[0001] The invention relates to a precision filtering syringe and belongs to the field of medical syringes. Background Art

[0002] A syringe is a common liquid medicine injection device used for extracting and injecting liquid medicine. However, during the injection process, the liquid medicine may contain ampoule residue (glass particles) or rubber particles, which may affect the health of the patient. Therefore, people consider filtering the particles in the liquid medicine by filtering the extracted liquid medicine. For example, an impurity filtering syringe disclosed in the authorization announcement No. CN213964362U has a connecting sleeve fixed on the injection head at the front end of the injection outer barrel, and a connecting shell connected to a filter screen is placed on the limiting step at the other end of the connecting sleeve. The needle is then connected to the connecting sleeve. In this way, when the liquid medicine is extracted, the glass particles, rubber particles, etc. that may exist in the liquid medicine are isolated by the filter screen. Before the liquid medicine is injected, the connecting sleeve and the needle are unplugged, replaced with a new needle, and then the patient is injected to achieve filtering of the particles in the liquid medicine. However, the syringe is cumbersome to operate and the needle needs to be replaced. In addition, other liquid medicine contamination may occur during the replacement process, posing a safety hazard. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a precision filtering syringe that can effectively filter particles in the drug solution during the drug solution injection process without the need for other additional operations. The operation is simple and the safety hazards caused by particles in the drug solution can be eliminated.

[0004] The precision filtering syringe of the present invention comprises an outer tube and a core rod; A filter valve is provided at the inner top of the outer cylinder, and the filter valve comprises a valve body, a liquid inlet one-way valve core, a filter membrane and a liquid outlet valve core; The valve body is fixedly installed on the inner top of the outer cylinder, the upper part of which is open, and the bottom of which is an elastic valve plate, and the elastic valve plate is provided with a liquid inlet hole; The liquid inlet one-way valve core is installed in the valve body, and a liquid inlet channel is provided on it. A gap is provided between the top of the valve core and the inner top of the outer cylinder, which connects the liquid inlet channel and the liquid outlet of the outer cylinder. The elastic valve sheet blocks the liquid inlet channel from below. When an external force acts on the elastic valve sheet from above, the elastic valve sheet elastically deforms downward, and forms a liquid inlet gap connecting the liquid inlet channel and the liquid inlet hole with the liquid inlet one-way valve core. An installation groove connected to the liquid inlet hole is provided on the upper end surface of the liquid inlet one-way valve core, and a liquid outlet valve core and a filter membrane are installed in the installation groove; the liquid outlet valve core includes an elastic core body provided with a liquid outlet channel and a pressure cover, the pressure cover blocks the liquid outlet channel on the elastic core body from below, and the liquid outlet hole is provided on the pressure cover; when external force acts on the elastic core body from below through the liquid outlet hole, the elastic core body undergoes elastic deformation upward, and a liquid outlet gap connecting the liquid outlet channel and the liquid outlet hole is formed between the elastic core body and the pressure cover; the filter membrane is installed on the inner bottom of the installation groove, and it is pressed and fixed by the pressure cover above.

[0005] The specific process of injection using the precision filtration syringe of the present invention is as follows: ① Extracting liquid medicine: When the core rod is pulled toward the rear end of the outer cylinder, the elastic valve plate is subjected to downward force (i.e., toward the core rod side of the inner cavity of the outer cylinder) to undergo elastic deformation and no longer block the liquid inlet channel. The liquid inlet gap is opened, and because the elastic core body blocks the liquid outlet channel from below, the liquid medicine can only enter the liquid inlet channel of the liquid inlet one-way valve core along the liquid outlet and gap of the outer cylinder, and enter the inner cavity of the outer cylinder through the liquid inlet gap and the liquid inlet hole until the liquid medicine is completely extracted. At this time, the core rod is stopped from being pulled, and the external force acting on the elastic valve plate disappears. The elastic valve plate returns to the initial state and blocks the liquid inlet channel again. ② Push injection of liquid medicine: Push the core rod toward the front end of the outer tube. Because the elastic valve sheet blocks the liquid inlet channel from below, the liquid medicine can only go up through the liquid inlet hole and pass through the filter membrane. If there are particles in the liquid medicine, they will be effectively filtered by the filter membrane. Then the liquid medicine reaches the elastic core through the liquid outlet hole and pushes the elastic core upward, causing the elastic core to deform upward elastically, forming a liquid outlet gap connecting the liquid outlet hole and the liquid outlet channel with the gland (that is, the liquid outlet gap is opened). The liquid medicine enters the liquid outlet of the outer tube through the liquid outlet gap and the liquid outlet channel until the liquid medicine push injection operation is completed. During the drug push injection process, the particles in the liquid medicine are effectively filtered by the filter membrane, eliminating the safety hazards caused by particles in the liquid medicine.

[0006] In addition, when using this precision filtration syringe for injection, you can directly follow the routine clinical operation. Medical personnel do not need to change their original operating habits. The operation is more convenient and can reduce the probability of misoperation caused by changing clinical operating habits.

[0007] Preferably, the liquid inlet channel passes through the liquid inlet one-way valve core from top to bottom and is evenly arranged on the outer periphery of the installation groove.

[0008] Preferably, a through hole is provided at the bottom of the installation groove of the liquid inlet one-way valve core, and is communicated with the liquid inlet hole through the through hole.

[0009] Further preferably, an annular boss is provided on the inner wall of the valve body, and an annular groove corresponding to the annular boss is provided on the outer wall of the liquid inlet one-way valve core. During installation, the annular groove of the liquid inlet one-way valve core and the annular boss on the inner wall of the valve body are engaged with each other to achieve fixed sealing assembly of the liquid inlet one-way valve core and the valve body.

[0010] Preferably, the upper end of the elastic core has an upwardly protruding sealing ring, and each liquid outlet channel is enclosed in the sealing ring; in the initial state, a gap is left between the sealing ring and the inner top of the outer tube, and when the elastic core undergoes elastic deformation upward and forms the liquid outlet gap between it and the pressure cover, the sealing ring abuts against the inner top of the outer tube, so that the gap - the medicine flow channel is blocked by the sealing ring, and when the medicine is injected, the medicine can only enter the liquid outlet of the outer tube along the liquid outlet channel and will not return to the liquid inlet channel along the gap, thereby reducing the waste of medicine.

[0011] Further preferably, an inner groove is provided on the lower end surface of the elastic core, a thin spring valve sheet is formed on the top of which, and the upper part of the pressure cover is installed in the inner groove; the liquid outlet channel on the elastic core is located on the thin spring valve sheet; when external force acts on the thin spring valve sheet on the top of the elastic core from below, the thin spring valve sheet elastically deforms upward, and a liquid outlet gap connecting the liquid outlet channel and the liquid outlet hole is formed between the thin spring valve sheet and the pressure cover.

[0012] Preferably, the groove wall of the inner groove of the elastic core has a sealing convex ring, and an annular groove is provided on the outer periphery of the upper part of the gland corresponding to the sealing convex ring. During installation, the sealing convex ring and the annular groove on the outer periphery of the gland engage with each other to achieve fixed sealing assembly of the gland and the elastic core.

[0013] Preferably, the lower part of the gland has an outer edge, and the outer edge fits with the lower end surface of the elastic core, further ensuring the seal between the gland and the elastic core.

[0014] Preferably, the liquid outlet channels on the elastic core are evenly distributed.

[0015] Preferably, the valve body and the outer tube are assembled by interference fit.

[0016] Compared with the prior art, the clamp-ring type self-destructing syringe of the present invention has the following beneficial effects: The precision filtering syringe described in the present invention has a reasonable and ingenious structural design. It can ensure the normal extraction of the drug solution through the uniquely structured filter valve arranged on the top of the outer cylinder, and can effectively filter the particles in the drug solution during the drug solution injection process, eliminating the safety hazards caused by the particles in the drug solution; at the same time, when using it for injection, it can be directly operated according to routine clinical operations. Medical personnel do not need to change their original operating habits or perform other additional operations. It is easy to operate and can reduce the probability of misoperation caused by changing clinical operating habits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of embodiment 1; Figure 2 yes Figure 1 AA section view in; Figure 3 yes Figure 2 A partial enlarged view of the middle I part; Figure 4 It is a structural diagram of the filter valve; Figure 5 It is a three-dimensional diagram of the valve body; Figure 6 is a cross-sectional view of the valve body; Figure 7 It is a three-dimensional diagram of the liquid inlet one-way valve core; Figure 8 It is a cross-sectional view of the liquid inlet check valve core; Fig. 9 It is one of the three-dimensional images of the elastic core; Fig.10 It is the second stereogram of the elastic core; Fig.11 is a cross-sectional view of the elastic core; Fig.12 It is a stereogram of the gland; Fig.13 is a cross-sectional view of the gland; Fig.14 This is a schematic diagram of the structure of the first embodiment when extracting liquid medicine; Fig.15 It is a schematic diagram of the structure of the first embodiment in the state of pushing the medicine solution.

[0018] In the figure: 1, outer cylinder; 101, liquid outlet; 2, core rod; 3, elastic core; 301, liquid outlet channel; 302, sealing ring; 303, thin elastic valve plate; 304, inner groove; 305, sealing convex ring; 4, liquid inlet one-way valve core; 401, liquid inlet channel; 402, through hole; 403, mounting groove; 404, annular groove; 5, pressure cover; 501, liquid outlet hole; 502, annular groove; 503, outer edge; 6, filter membrane; 7, valve body; 701, elastic valve plate; 702, liquid inlet hole; 703, annular boss; 8, gap one; 9, liquid inlet gap; 10, liquid outlet gap. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are further described below in conjunction with the accompanying drawings: Embodiment 1: like Figures 1 to 15 As shown, the precision filtration syringe in this embodiment includes an outer tube 1 and a core rod 2; A filter valve is provided at the inner top of the outer cylinder 1, and the filter valve comprises a valve body 7, a liquid inlet check valve core 4, a filter membrane 6 and a liquid outlet valve core; The valve body 7 is fixedly mounted on the inner top of the outer tube 1, with an open top and an elastic valve plate 701 at the bottom. The elastic valve plate 701 has a liquid inlet hole 702. The liquid inlet one-way valve core 4 is installed in the valve body 7, and is provided with a liquid inlet channel 401. A gap 8 is provided between the top of the valve core 4 and the inner top of the outer cylinder 1, which connects the liquid inlet channel 401 with the liquid outlet 101 of the outer cylinder 1. The elastic valve plate 701 blocks the liquid inlet channel 401 from below. When an external force acts on the elastic valve plate 701 from above, the elastic valve plate 701 elastically deforms downward, and forms a liquid inlet gap 9 connecting the liquid inlet channel 401 with the liquid inlet hole 702 with the liquid inlet one-way valve core 4. A mounting groove 403 communicating with the liquid inlet hole 702 is provided on the upper end surface of the liquid inlet one-way valve core 4, and a liquid outlet valve core and a filter membrane 6 are installed in the mounting groove 403; the liquid outlet valve core includes an elastic core 3 provided with a liquid outlet channel 301 and a pressure cover 5, the pressure cover 5 blocks the liquid outlet channel 301 on the elastic core 3 from below, and a liquid outlet hole 501 is provided on the pressure cover 5; when an external force acts on the elastic core 3 from below through the liquid outlet hole 501, the elastic core 3 elastically deforms upward, and a liquid outlet gap 10 connecting the liquid outlet channel 301 and the liquid outlet hole 501 is formed between the elastic core 3 and the pressure cover 5; the filter membrane 6 is installed at the inner bottom of the mounting groove 403, and it is pressed and fixed by the pressure cover 5 above.

[0020] In this embodiment: The valve body 7 and the outer tube 1 are assembled by interference fit.

[0021] The liquid inlet channel 401 passes through the liquid inlet one-way valve core 4 from top to bottom and is evenly arranged on the outer periphery of the mounting groove 403 .

[0022] The bottom of the installation groove 403 of the liquid inlet check valve core 4 in this embodiment is provided with a through hole 402, and the through hole 402 is communicated with the liquid inlet hole 702. An annular boss 703 is provided on the inner wall of the valve body 7, and an annular groove 404 corresponding to the annular boss 703 is provided on the outer wall of the liquid inlet check valve core 4. When installed, the annular groove 404 of the liquid inlet check valve core 4 and the annular boss 703 on the inner wall of the valve body 7 are engaged with each other, so as to realize the fixed sealing assembly of the liquid inlet check valve core 4 and the valve body 7.

[0023] In the precision filtration syringe described in the present embodiment, the upper end of the elastic core 3 has a sealing ring 302 protruding upward, and each liquid outlet channel 301 is enclosed in the sealing ring 302; in the initial state, a gap is left between the sealing ring 302 and the inner top of the outer tube 1. When the elastic core 3 undergoes elastic deformation upward and forms the liquid outlet gap 10 between it and the pressure cover 5, the sealing ring 302 abuts against the inner top of the outer tube 1. In this way, the gap 8, which is a liquid medicine circulation channel, is blocked by the sealing ring 302. When the liquid medicine is injected, the liquid medicine can only enter the liquid outlet 101 of the outer tube 1 along the liquid outlet channel 301, and will not return to the liquid inlet channel 401 along the gap 8, thereby reducing the waste of liquid medicine.

[0024] An inner groove 304 is provided on the lower end surface of the elastic core 3, a thin elastic valve sheet 303 is formed on the top of the elastic core 3, and the upper part of the gland 5 is installed in the inner groove 304; the liquid outlet channel 301 on the elastic core 3 is located on the thin elastic valve sheet 303; when an external force acts on the thin elastic valve sheet 303 on the top of the elastic core 3 from below, the thin elastic valve sheet 303 elastically deforms upward, and a liquid outlet gap 10 is formed between the gland 5 and the liquid outlet channel 301 and the liquid outlet hole 501. Wherein: A sealing convex ring 305 is provided on the groove wall of the inner groove 304 of the elastic core 3, and an annular groove 502 is provided on the outer periphery of the upper part of the gland 5 corresponding to the sealing convex ring 305. During installation, the sealing convex ring 305 and the annular groove 502 on the outer periphery of the gland 5 are engaged with each other to realize the fixed sealing assembly of the gland 5 and the elastic core 3; The lower part of the gland 5 has an outer edge 503, and the outer edge 503 is in contact with the lower end surface of the elastic core 3, further ensuring the seal between the gland 5 and the elastic core 3; The liquid outlet channels 301 on the elastic core 3 are evenly distributed.

[0025] The specific process of extracting and injecting the drug solution using the precision filtration syringe described in this embodiment is as follows: ① Extracting liquid medicine: Pull the core rod 2 toward the rear end of the outer tube 1, and the elastic valve plate 701 is subjected to downward force (i.e., toward the side of the core rod 2 in the inner cavity of the outer tube 1) to undergo elastic deformation and no longer block the liquid inlet channel 401, and the liquid inlet gap 9 is opened. Since the thin elastic valve plate 303 of the elastic core body 3 blocks the liquid outlet channel 301 from below, the medicinal liquid can only enter the liquid inlet channel 401 of the liquid inlet check valve core 4 along the liquid outlet port 101 of the outer tube 1 and the gap 8, and enter the inner cavity of the outer tube 1 through the liquid inlet gap 9 and the liquid inlet hole 702 until the medicinal liquid is completely extracted. At this time, stop pulling the core rod 2, the external force acting on the elastic valve plate 701 disappears, and the elastic valve plate 701 returns to the initial state, and blocks the liquid inlet channel 401 again; ② Push injection of liquid medicine: The core rod 2 is pushed toward the front end of the outer tube 1. Since the elastic valve sheet 701 blocks the liquid inlet channel 401 from the bottom, the medicinal liquid can only go up through the liquid inlet hole 702, and pass through the through hole 402, the filter membrane 6 (if the medicinal liquid contains particles, they will be effectively filtered by the filter membrane 6), and the liquid outlet hole 501 in sequence to reach the position of the elastic core 3, and push the elastic core 3 upward, so that the thin elastic valve sheet 303 on the top of the elastic core 3 is elastically deformed upward, and a liquid outlet gap 10 connecting the liquid outlet hole 501 and the liquid outlet channel 301 is formed between the pressure cover 5 (that is, the liquid outlet gap 10 is opened). At the same time, the sealing ring 302 at the upper end of the thin elastic valve sheet 303 abuts against the inner top of the outer tube 1, blocking the gap 8 that is the medicinal liquid circulation channel. In this way, the medicinal liquid can only enter the liquid outlet 101 of the outer tube 1 along the liquid outlet gap 10 and the liquid outlet channel 301 until the medicinal liquid injection operation is completed. During the drug push injection process, the particles in the drug solution are effectively filtered by the filter membrane 6, eliminating the potential safety hazard caused by the particles in the drug solution.

[0026] In addition, when using the precision filtration syringe described in this embodiment for injection, conventional clinical operations can be directly followed. Medical personnel do not need to change their original operating habits, which makes the operation more convenient and can reduce the probability of misoperation caused by changing clinical operating habits.

Claims

1. A precision filtering syringe, comprising an outer tube (1) and a core rod (2), characterized in that: A filter valve is provided at the inner top of the outer cylinder (1), the filter valve comprising a valve body (7), a liquid inlet one-way valve core (4), a filter membrane (6) and a liquid outlet valve core; The valve body (7) is fixedly mounted on the inner top of the outer cylinder (1), the upper part of which is open, and the bottom of which is an elastic valve plate (701), and the elastic valve plate (701) is provided with a liquid inlet hole (702); The liquid inlet one-way valve core (4) is installed in the valve body (7), and is provided with a liquid inlet channel (401). A gap (8) is provided between the top of the valve core and the inner top of the outer cylinder (1), which connects the liquid inlet channel (401) and the liquid outlet (101) of the outer cylinder (1). The elastic valve plate (701) blocks the liquid inlet channel (401) from below. When an external force acts on the elastic valve plate (701) from above, the elastic valve plate (701) elastically deforms downward, and forms a liquid inlet gap (9) between the elastic valve plate (701) and the liquid inlet channel (401) and the liquid inlet hole (702). The upper end surface of the liquid inlet one-way valve core (4) is provided with a mounting groove (403) which is in communication with the liquid inlet hole (702); the liquid outlet valve core and the filter membrane (6) are installed in the mounting groove (403); the liquid outlet valve core comprises an elastic core (3) provided with a liquid outlet channel (301) and a pressure cover (5); the pressure cover (5) blocks the liquid outlet channel (301) on the elastic core (3) from below, and the pressure cover (5) is provided with a liquid outlet hole (501); when an external force acts on the elastic core (3) from below through the liquid outlet hole (501), the elastic core (3) elastically deforms upwards and forms a liquid outlet gap (10) between the elastic core (3) and the pressure cover (5) which connects the liquid outlet channel (301) and the liquid outlet hole (501); the filter membrane (6) is installed at the inner bottom of the mounting groove (403) and is pressed and fixed by the pressure cover (5) above.

2. The precision filtration syringe according to claim 1, characterized in that: The liquid inlet channel (401) passes through the liquid inlet one-way valve core (4) vertically and is evenly arranged on the outer periphery of the installation groove (403).

3. The precision filtration syringe according to claim 1 or 2, characterized in that: A through hole (402) is provided at the bottom of the mounting groove (403) of the liquid inlet one-way valve core (4), and is in communication with the liquid inlet hole (702) through the through hole (402).

4. The precision filtration syringe according to claim 3, characterized in that: An annular boss (703) is provided on the inner wall of the valve body (7), and an annular groove (404) corresponding to the annular boss (703) is provided on the outer wall of the liquid inlet one-way valve core (4).

5. The precision filtration syringe according to claim 1, characterized in that: The upper end of the elastic core (3) has a sealing ring (302) protruding upward, and each liquid outlet channel (301) is enclosed in the sealing ring (302); in the initial state, a gap is left between the sealing ring (302) and the inner top of the outer tube (1); when the elastic core (3) elastically deforms upward and forms the liquid outlet gap (10) between it and the gland (5), the sealing ring (302) abuts against the inner top of the outer tube (1).

6. The precision filtration syringe according to claim 1, 2 or 5, characterized in that: An inner groove (304) is provided on the lower end surface of the elastic core (3), a thin elastic valve sheet (303) is formed on the top of the elastic core, and the upper part of the pressure cover (5) is installed in the inner groove (304); the liquid outlet channel (301) on the elastic core (3) is located on the thin elastic valve sheet (303); when an external force acts on the thin elastic valve sheet (303) on the top of the elastic core (3) from below, the thin elastic valve sheet (303) elastically deforms upwards, and forms a liquid outlet gap (10) between the pressure cover (5) and the liquid outlet channel (301) and the liquid outlet hole (501).

7. The precision filtration syringe according to claim 6, characterized in that: A sealing convex ring (305) is provided on the groove wall of the inner groove (304) of the elastic core (3), and an annular groove (502) is provided on the outer periphery of the upper part of the gland (5) corresponding to the sealing convex ring (305).

8. The precision filtration syringe according to claim 7, characterized in that: The lower part of the gland (5) has an outer edge (503), and the outer edge (503) is in contact with the lower end surface of the elastic core (3).

9. The precision filtration syringe according to claim 1, 2 or 5, characterized in that: The liquid outlet channels (301) on the elastic core (3) are evenly distributed.

10. The precision filtration syringe according to claim 1, characterized in that: The valve body (7) and the outer tube (1) are assembled by means of interference fit.

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