Precision Filter Syringe

Abstract

The present invention belongs to the field of medical syringes, and particularly relates to a precision filtration syringe. A filtration valve is provided at the top inside the outer cylinder; the filtration valve includes a valve body, an inlet liquid one-way valve core, a filtration membrane and an outlet liquid valve core; the valve body is fixed at the top inside the outer cylinder, and an elastic valve sheet is provided at its bottom; the inlet liquid one-way valve core is installed inside the valve body, and an inlet liquid channel is provided thereon, and the elastic valve sheet blocks the inlet liquid channel from below; the outlet liquid valve core and the filtration membrane are installed in the installation groove on the upper end surface of the inlet liquid one-way valve core; the outlet liquid valve core includes an elastic core body provided with an outlet liquid channel and a gland, the gland blocks the outlet liquid channel from below, and an outlet liquid hole is opened on the gland; the filtration membrane is tightly fixed by the upper gland. When extracting the medicinal liquid, the elastic valve sheet deforms downward to open the inlet liquid gap, and the medicinal liquid enters the syringe through the inlet liquid channel; when injecting the medicinal liquid, the elastic core body deforms upward to open the outlet liquid gap, the microparticles in the medicinal liquid are filtered by the filtration membrane, and the filtered medicinal liquid is output through the outlet liquid channel, eliminating potential safety hazards.

Description

Technical Field

[0001] The present invention relates to a precision filtration syringe, belonging to the field of medical syringes. Background Art

[0002] A syringe is a common medical liquid injection device used for extracting and injecting medical liquids. However, during the injection process, the presence of ampoule residues (glass particles) or rubber particles in the liquid may affect the health of patients. Therefore, people consider filtering the particles in the extracted liquid by filtering the liquid. For example, an impurity filtration syringe disclosed in the authorized publication number CN213964362U fixes a connecting sleeve on the injection head at the front end of the injection outer cylinder. A connecting shell with a filter net is placed on the limiting step at the other end of the connecting sleeve, and then the needle is connected to the connecting sleeve. In this way, when extracting the liquid, glass particles, rubber particles, etc. that may exist in the liquid are isolated by the filter net. Before injecting the liquid, the connecting sleeve and the needle are removed, a new needle is replaced, and then the patient is injected to achieve the filtration of particles in the liquid. However, this syringe is cumbersome to operate during use, requires needle replacement, and there may be other liquid contamination situations 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 filtration syringe that can effectively filter the particles in the liquid during the liquid injection process without other additional operations, is easy to operate, and can eliminate the safety hazards caused by the particles in the liquid.

[0004] The precision filtration syringe described in the present invention includes an outer cylinder and a plunger rod;

[0005] A filter valve is provided at the inner top of the outer cylinder. The filter valve includes a valve body, an inlet check valve core, a filter membrane, and an outlet valve core;

[0006] The valve body is fixedly installed at the inner top of the outer cylinder. Its upper part is open, and its bottom is an elastic valve sheet with a liquid inlet hole opened thereon;

[0007] The inlet check valve core is installed in the valve body, and it is provided with an inlet channel. There is a gap one between its top and the inner top of the outer cylinder, which communicates the inlet channel with the outlet of the outer cylinder; the elastic valve sheet blocks the inlet channel from below. When an external force acts on the elastic valve sheet from above, the elastic valve sheet undergoes elastic deformation downward and forms a liquid inlet gap that communicates the inlet channel with the liquid inlet hole between it and the inlet check valve core;

[0008] An installation groove communicating with the liquid inlet hole is formed on the upper end surface of the liquid inlet one-way valve core. The liquid outlet valve core and the 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 gland. The gland plugs the liquid outlet channel on the elastic core body from below, and a liquid outlet hole is formed on the gland. When an external force acts on the elastic core body from below through the liquid outlet hole, the elastic core body elastically deforms upward, and a liquid outlet gap communicating the liquid outlet channel with the liquid outlet hole is formed between the elastic core body and the gland. The filter membrane is installed at the inner bottom of the installation groove and is tightly fixed by the gland above.

[0009] The specific process of injecting with the precision filtering syringe of the present invention is as follows:

[0010] ① Drawing the liquid medicine:

[0011] Pull the core rod backward to the rear end of the outer cylinder. The elastic valve piece is elastically deformed downward (i.e., to the side of the core rod in the inner cavity of the outer cylinder) under the force, and no longer plugs the liquid inlet channel. The liquid inlet gap is opened. Since the elastic core body plugs 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 of the outer cylinder and gap one, 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 drawn. At this time, stop pulling the core rod, the external force acting on the elastic valve piece disappears, and the elastic valve piece returns to the initial state, plugging the liquid inlet channel again.

[0012] ② Injecting the liquid medicine:

[0013] Push the core rod forward to the front end of the outer cylinder. Since the elastic valve piece plugs the liquid inlet channel from below, the liquid medicine can only go upward through the liquid inlet hole, 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 position of the elastic core body through the liquid outlet hole, and pushes the elastic core body upward, causing the elastic core body to elastically deform upward, and a liquid outlet gap communicating the liquid outlet hole with the liquid outlet channel is formed between the elastic core body and the gland (i.e., the liquid outlet gap is opened). The liquid medicine enters the liquid outlet of the outer cylinder through the liquid outlet gap and the liquid outlet channel until the liquid medicine injection operation is completed. During the drug injection process, the particles in the liquid medicine are effectively filtered by the filter membrane, eliminating the safety hazards caused by the particles in the liquid medicine.

[0014] In addition, when using this precision filtering syringe for injection, it can be directly operated according to the conventional clinical operation. Medical staff do not need to change the original operation habits, the operation is more convenient, and the probability of misoperation caused by changing the clinical operation habits can be reduced.

[0015] Preferably, the liquid inlet channel runs through the liquid inlet one-way valve core up and down and is uniformly arranged on the outer periphery of the installation groove.

[0016] Preferably, a through hole is formed at the bottom of the installation groove of the liquid inlet one-way valve core and communicates with the liquid inlet hole through the through hole.

[0017] 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 inlet one-way valve core. During installation, the annular groove of the inlet one-way valve core engages with the annular boss on the inner wall of the valve body to achieve fixed and sealed assembly of the inlet one-way valve core and the valve body.

[0018] Preferably, the upper end of the elastic core body has a sealing ring protruding upward, and each liquid outlet channel is enclosed within the sealing ring; in the initial state, there is a gap between the sealing ring and the inner top of the outer cylinder. When the elastic core body undergoes elastic deformation upward and forms the liquid outlet gap between it and the gland, the sealing ring abuts against the inner top of the outer cylinder. In this way, the gap, which is a liquid medicine circulation channel, is blocked by the sealing ring. When injecting the liquid medicine, the liquid medicine can only enter the liquid outlet of the outer cylinder along the liquid outlet channel and will not return to the inlet channel along the gap one, reducing waste of the liquid medicine.

[0019] Further preferably, an inner groove is formed on the lower end surface of the elastic core body, and a thin elastic valve sheet is formed on its top. The upper part of the gland is installed in the inner groove; the liquid outlet channels on the elastic core body are located on the thin elastic valve sheet; when an external force acts on the thin elastic valve sheet at the top of the elastic core body from below, the thin elastic valve sheet undergoes elastic deformation upward and forms a liquid outlet gap communicating the liquid outlet channel with the liquid outlet hole between it and the gland.

[0020] Preferably, a sealing convex ring is provided on the groove wall of the inner groove of the elastic core body, 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 engages with the annular groove on the outer periphery of the gland to achieve fixed and sealed assembly of the gland and the elastic core body.

[0021] 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 body, further ensuring the seal between the gland and the elastic core body.

[0022] Preferably, the liquid outlet channels on the elastic core body are evenly distributed.

[0023] Preferably, the valve body and the outer cylinder are assembled by an interference fit method.

[0024] Compared with the prior art, the snap-ring type self-destructing syringe of the present invention has the following beneficial effects:

[0025] The precision filtration syringe of the present invention has a reasonable and ingenious structural design. Through the filter valve with a unique structure provided on the inner top of the outer cylinder, it can ensure the normal extraction of the liquid medicine and can effectively filter the microparticles in the liquid medicine during the injection process of the liquid medicine, eliminating the safety hazards caused by the microparticles in the liquid medicine; at the same time, when using it for injection, it can be directly operated according to the conventional clinical operation. Medical staff do not need to change the original operation habits and do not need other additional operations. The operation is simple, and it can reduce the probability of misoperation caused by changing the clinical operation habits. Description of the Drawings

[0026] Figure 1 is the structural schematic diagram of the first embodiment;

[0027] Figure 2 is Figure 1 the A-A sectional view in

[0028] Figure 3 is Figure 2 the partial enlarged view of part I in

[0029] Figure 4 is the structural schematic diagram of the filter valve;

[0030] Figure 5 is the three-dimensional view of the valve body;

[0031] Figure 6 is the sectional view of the valve body;

[0032] Figure 7 is the three-dimensional view of the liquid inlet check valve core;

[0033] Figure 8 is the sectional view of the liquid inlet check valve core;

[0034] Figure 9 is one of the three-dimensional views of the elastic core;

[0035] Figure 10 is the other three-dimensional view of the elastic core;

[0036] Figure 11 is the sectional view of the elastic core;

[0037] Figure 12 is the three-dimensional view of the gland;

[0038] Figure 13 is the sectional view of the gland;

[0039] Figure 14 is the structural schematic diagram of the first embodiment in the state of extracting liquid medicine;

[0040] Figure 15 is the structural schematic diagram of the first embodiment in the state of injecting liquid medicine.

[0041] In the figure: 1. Outer cylinder; 101. Liquid outlet; 2. Core rod; 3. Elastic core body; 301. Liquid outlet channel; 302. Sealing ring; 303. Thin elastic valve sheet; 304. Inner groove; 305. Sealing convex ring; 4. Liquid inlet one-way valve core; 401. Liquid inlet channel; 402. Through hole; 403. Installation groove; 404. Annular groove; 5. Pressing cover; 501. Liquid outlet hole; 502. Annular groove; 503. Outer edge; 6. Filter membrane; 7. Valve body; 701. Elastic valve sheet; 702. Liquid inlet hole; 703. Annular boss; 8. Gap one; 9. Liquid inlet gap; 10. Liquid outlet gap. Specific implementation mode

[0042] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0043] Embodiment 1:

[0044] As Figures 1 to 15 shown, the precision filtration syringe in this embodiment includes an outer cylinder 1 and a core rod 2;

[0045] A filter valve is provided at the inner top of the outer cylinder 1. The filter valve includes a valve body 7, a liquid inlet one-way valve core 4, a filter membrane 6 and a liquid outlet valve core;

[0046] The valve body 7 is fixedly installed at the inner top of the outer cylinder 1. Its upper part is open, and its bottom is an elastic valve sheet 701. A liquid inlet hole 702 is opened on the elastic valve sheet 701;

[0047] The liquid inlet one-way valve core 4 is installed in the valve body 7. A liquid inlet channel 401 is provided on it. There is a gap one 8 between its top 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 sheet 701 blocks the liquid inlet channel 401 from below. When an external force acts on the elastic valve sheet 701 from above, the elastic valve sheet 701 undergoes elastic deformation downward, and a liquid inlet gap 9 connecting the liquid inlet channel 401 and the liquid inlet hole 702 is formed between it and the liquid inlet one-way valve core 4;

[0048] An installation groove 403 communicating with the liquid inlet hole 702 is opened on the upper end surface of the liquid inlet one-way valve core 4. The liquid outlet valve core and the filter membrane 6 are installed in the installation groove 403; the liquid outlet valve core includes an elastic core body 3 provided with a liquid outlet channel 301 and a pressing cover 5. The pressing cover 5 blocks the liquid outlet channel 301 on the elastic core body 3 from below. A liquid outlet hole 501 is opened on the pressing cover 5; when an external force acts on the elastic core body 3 from below through the liquid outlet hole 501, the elastic core body 3 undergoes elastic deformation upward, and a liquid outlet gap 10 connecting the liquid outlet channel 301 and the liquid outlet hole 501 is formed between it and the pressing cover 5; the filter membrane 6 is installed at the inner bottom of the installation groove 403 and is tightly fixed by the pressing cover 5 above it.

[0049] In this embodiment:

[0050] The valve body 7 and the outer cylinder 1 are assembled by an interference fit method.

[0051] The liquid inlet channel 401 runs through the liquid inlet one-way valve core 4 vertically and is evenly arranged on the outer periphery of the installation groove 403.

[0052] In this embodiment, a through hole 402 is opened at the bottom of the installation groove 403 of the liquid inlet one-way valve core 4, and it communicates with the liquid inlet hole 702 through the through hole 402. 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. During installation, the annular groove 404 of the liquid inlet one-way valve core 4 and the annular boss 703 on the inner wall of the valve body 7 are engaged with each other to achieve the fixed and sealed assembly of the liquid inlet one-way valve core 4 and the valve body 7.

[0053] In the precision filtration syringe described in this embodiment, the upper end of the elastic core 3 has a sealing ring 302 protruding upward, and each liquid outlet channel 301 is enclosed within the sealing ring 302; in the initial state, there is a gap between the sealing ring 302 and the inner top of the outer cylinder 1. When the elastic core 3 undergoes elastic deformation 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 cylinder 1. In this way, the liquid medicine flow channel of the gap one 8 is blocked by the sealing ring 302. When injecting the liquid medicine, the liquid medicine can only enter the liquid outlet 101 of the outer cylinder 1 along the liquid outlet channel 301 and will not return to the liquid inlet channel 401 along the gap one 8 again, reducing the waste of liquid medicine.

[0054] An inner groove 304 is opened on the lower end surface of the elastic core 3, and the top of the elastic core 3 forms a thin elastic valve sheet 303. The upper part of the gland 5 is installed in the inner groove 304; the liquid outlet channels 301 on the elastic core 3 are located on the thin elastic valve sheet 303; when an external force acts on the thin elastic valve sheet 303 at the top of the elastic core 3 from below, the thin elastic valve sheet 303 undergoes elastic deformation upward and forms a liquid outlet gap 10 connecting the liquid outlet channel 301 and the liquid outlet hole 501 with the gland 5. Among them:

[0055] The groove wall of the inner groove 304 of the elastic core 3 has a sealing convex ring 305. Correspondingly, an annular groove 502 is opened on the outer periphery of the upper part of the gland 5. 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 achieve the fixed and sealed assembly of the gland 5 and the elastic core 3;

[0056] The lower part of the gland 5 has an outer edge 503, and the outer edge 503 fits against the lower end surface of the elastic core 3, further ensuring the seal between the gland 5 and the elastic core 3;

[0057] The liquid outlet channels 301 on the elastic core 3 are evenly distributed.

[0058] The specific process of extracting and injecting liquid medicine using the precision filtering syringe described in this embodiment is as follows:

[0059] ① Extracting liquid medicine:

[0060] Pull the plunger rod 2 backward at the rear end of the outer cylinder 1. The elastic valve piece 701 is stressed and elastically deformed downward (i.e., toward the side of the plunger rod 2 in the inner cavity of the outer cylinder 1), and no longer blocks the liquid inlet channel 401. The liquid inlet gap 9 is opened. Since the thin elastic valve piece 303 of the elastic core 3 blocks the liquid outlet channel 301 from below, the liquid medicine can only enter the liquid inlet channel 401 of the liquid inlet one-way valve core 4 along the liquid outlet 101 of the outer cylinder 1 and the gap one 8, and then enter the inner cavity of the outer cylinder 1 through the liquid inlet gap 9 and the liquid inlet hole 702 until the liquid medicine extraction is completed. At this time, stop pulling the plunger rod 2, the external force acting on the elastic valve piece 701 disappears, and the elastic valve piece 701 returns to its initial state, blocking the liquid inlet channel 401 again;

[0061] ② Injecting liquid medicine:

[0062] Push the plunger rod 2 forward at the front end of the outer cylinder 1. Since the elastic valve piece 701 blocks the liquid inlet channel 401 from below, the liquid medicine can only go upward through the liquid inlet hole 702, pass through the through hole 402, the filter membrane 6 (if there are particles in the liquid medicine, they will be effectively filtered by the filter membrane 6) and the liquid outlet hole 501 to reach the position of the elastic core 3, and push the elastic core 3 upward, so that the thin elastic valve piece 303 at the top of the elastic core 3 elastically deforms upward, forming a liquid outlet gap 10 (i.e., the liquid outlet gap 10 is opened) that connects the liquid outlet hole 501 and the liquid outlet channel 301 between the elastic core 3 and the gland 5. At the same time, the sealing ring 302 at the upper end of the thin elastic valve piece 303 abuts against the inner top of the outer cylinder 1, blocking the liquid medicine circulation channel of the gap one 8. In this way, the liquid medicine can only enter the liquid outlet 101 of the outer cylinder 1 along the liquid outlet gap 10 and the liquid outlet channel 301 until the liquid medicine injection operation is completed. During the drug injection process, the particles in the liquid medicine are effectively filtered by the filter membrane 6, eliminating the safety hazards caused by the particles in the liquid medicine.

[0063] In addition, when using the precision filtering syringe described in this embodiment for injection, it can be directly operated according to the conventional clinical operation. Medical staff do not need to change their original operation habits, the operation is more convenient, and it can reduce the probability of misoperation caused by changing clinical operation 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), and 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 upward, 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; 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).

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 or 2, 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 upward, and forms a liquid outlet gap (10) between the pressure cover (5) and the liquid outlet channel (301) and the liquid outlet hole (501).

6. The precision filtration syringe according to claim 5, 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).

7. The precision filtration syringe according to claim 6, 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).

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

9. The precision filtration syringe according to claim 1, characterized in that: The valve body (7) and the outer tube (1) are assembled in an interference fit manner.

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