A one-way filtering injection needle

Abstract

The present invention discloses a one-way filtration injection needle, which comprises an upper needle seat and a lower needle seat. The two are hermetically connected and a cavity is formed therebetween. A one-way valve is provided in the cavity. The one-way valve divides the cavity into a liquid inlet cavity and a liquid outlet cavity. The liquid inlet cavity is located inside the one-way valve, and the liquid outlet cavity is located outside the one-way valve. Both the liquid inlet cavity and the liquid outlet cavity communicate with the inside of the lower needle seat. The one-way valve comprises a one-way valve body, a top ring and an umbrella skirt. The one-way valve body is in a cylindrical shape. The top ring is connected to the front end of the one-way valve body, and the inner diameter of the top ring is smaller than the inner diameter of the one-way valve body. The umbrella skirt is located on the outer periphery of the one-way valve body. A convex ring is provided in the cavity, and a slider is provided in the liquid inlet cavity. When the liquid medicine enters and exits, a pressure difference will be generated in the cavity. Under the action of the pressure difference, the one-way valve fits and seals with the slider or the convex ring, realizing the one-way flow of the liquid medicine. The sealing method of the two components fitting together can achieve sealing under a smaller pressure difference, and at the same time, the sealing effect is more stable, avoiding liquid leakage inside the one-way filtration injection needle.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a one-way filtration injection needle. Background Art

[0002] Currently, the common packaging forms of small-sized injection agents are vials and ampoules. When using the drugs in vials or ampoules clinically, it is necessary to first puncture the vial stopper with an injection needle or cut the top of the ampoule. Using vials or ampoules easily causes vial stopper debris or glass debris to enter the liquid medicine. Injecting the liquid medicine containing impurities directly into the human body may cause adverse reactions such as phlebitis in patients. Therefore, it is necessary to filter the liquid medicine before injecting it.

[0003] The injection needle with a one-way filtration function is the simplest and safest liquid medicine filtration device currently. The injection needle with a one-way filtration function can prevent secondary contamination of the liquid medicine while filtering it. Currently, the existing injection needles with a one-way filtration function on the market mainly include two types: a perforated arc-shaped rubber stopper and a sealing mechanism with a top cover. However, both of them have the problem that the sealing effect cannot be guaranteed, so there is still a risk of causing adverse reactions in patients for the injection needle with a one-way filtration function.

[0004] Therefore, how to provide a one-way filtration injection needle with a better sealing effect is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a one-way filtration injection needle, which is provided with a one-way valve. The one-way valve fits with a convex ring or a slider under the action of a pressure difference to respectively achieve sealing when extracting the liquid medicine and injecting the liquid medicine, ensuring that the one-way filtration injection needle has a better sealing effect.

[0006] To achieve the above purpose, the present invention provides a one-way filtration injection needle, including an upper needle seat and a lower needle seat that are hermetically connected. A cavity is formed between the upper needle seat and the lower needle seat. A one-way valve is provided in the cavity. The cavity includes a liquid inlet cavity inside the one-way valve and a liquid outlet cavity outside the one-way valve. Both the liquid inlet cavity and the liquid outlet cavity communicate with the inside of the lower needle seat. The one-way valve includes a cylindrical one-way valve body, a top ring connected to the front end of the one-way valve body, and an umbrella skirt arranged on the outer periphery of the one-way valve body. The top ring has a through hole penetrating in the radial direction. A convex ring that fits with the umbrella skirt to seal the liquid outlet cavity when extracting the liquid medicine is provided in the cavity. The inner diameter of the top ring is smaller than the inner diameter of the one-way valve body. A slider that fits with the top ring to seal the liquid inlet cavity when injecting the liquid medicine is provided in the one-way valve body.

[0007] Preferably, the lower needle seat comprises a lower needle seat body and a needle seat tip, the lower needle seat body is conical, and its diameter gradually increases in the direction away from the upper needle seat, the needle seat tip is arranged at the front end of the lower needle seat body, the one-way valve body is sleeved on the outer periphery of the needle seat tip and is sealed with the needle seat tip, and the needle seat tip has a connecting hole that penetrates axially to connect the liquid inlet cavity and the inner side of the lower needle seat body.

[0008] Preferably, the diameter of the slider is smaller than the inner diameter of the one-way valve body and larger than the diameter of the connecting hole. The front end of the needle seat tip has a liquid flow groove. When extracting the liquid medicine, the slider abuts against the front end of the needle seat tip. The liquid flow groove can connect the liquid inlet cavity and the inner side of the lower needle seat.

[0009] Preferably, the front end of the lower needle seat body is provided with a filter hole located at the outer periphery of the needle seat tip for connecting the liquid outlet cavity and the inner side of the lower needle seat, and the filter hole is covered with filter material.

[0010] Preferably, the end surface of the lower needle seat body facing the cavity is provided with a filter groove located at the outer periphery of the needle seat tip, the filter groove is annular, the filter hole is located at the bottom of the filter groove, and the filter material is a filter membrane covering the notch of the filter groove.

[0011] Preferably, a limiting boss is provided on the outer periphery of the needle seat tip, which abuts against the one-way valve body to limit the one-way valve body.

[0012] Preferably, a making way structure for the umbrella skirt to make way when injecting liquid medicine is provided at the front end of the liquid outlet cavity.

[0013] Preferably, the giving way structure is a deformation groove located at the front end of the liquid outlet cavity.

[0014] The one-way filtering injection needle provided by the present invention comprises an upper needle seat and a lower needle seat, which are sealed and connected to form a cavity between them. A one-way valve is arranged in the cavity, and the one-way valve divides the cavity into a liquid inlet cavity and a liquid outlet cavity. The liquid inlet cavity is located on the inner side of the one-way valve, and the liquid outlet cavity is located on the outer side of the one-way valve. Both the liquid inlet cavity and the liquid outlet cavity are connected to the inner side of the lower needle seat. The one-way valve comprises a one-way valve body, a top ring and an umbrella skirt. The one-way valve body is cylindrical, and the top ring is connected to the front end of the one-way valve body, and the inner diameter of the top ring is smaller than the inner diameter of the one-way valve body. The umbrella skirt is located on the outer periphery of the one-way valve body. A convex ring is arranged in the cavity. When extracting liquid medicine, the umbrella skirt fits with the convex ring to seal the liquid outlet cavity, and the liquid medicine enters the inner side of the lower needle seat from the liquid inlet cavity. A slider is provided in the liquid inlet cavity, the diameter of which is smaller than the inner diameter of the one-way valve body and larger than the inner diameter of the top ring. When injecting liquid medicine, the slider fits with the top ring under pressure to seal the liquid inlet cavity, and the liquid medicine flows out from the liquid outlet cavity.

[0015] A pressure difference will be generated in the cavity when the liquid medicine enters and exits. Under the action of the pressure difference, the one-way valve fits and seals with the slider or the convex ring to achieve the one-way flow of the liquid medicine. The sealing method of the two components fitting together can achieve sealing under a relatively small pressure difference, and at the same time, the sealing effect is more stable, avoiding liquid leakage in the one-way filtration injection needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0017] Figure 1 It is a cross-sectional view of the one-way filtration injection needle provided by the present invention;

[0018] Figure 2 is Figure 1 a schematic structural diagram of the one-way valve in

[0019] Figure 3 is Figure 1 a cross-sectional view of the one-way valve in

[0020] Figure 4 is Figure 1 a cross-sectional view of the lower needle seat in

[0021] Figure 5 is Figure 1 a top view of the lower needle seat in

[0022] Figure 6 is a schematic diagram of the one-way filtration injection needle when the liquid medicine flows in Figure 1 in

[0023] Figure 7 is a schematic diagram of the one-way filtration injection needle when the liquid medicine flows out Figure 1 in

[0024] Among them, Figures 1 to 7 the reference numerals in

[0025] are: syringe needle 1, upper needle seat 2, convex ring 3, deformation groove 4, liquid inlet cavity 5, needle seat tip 6, lower needle seat body 7, liquid flow groove 8, filter hole 9, filter membrane 10, liquid outlet cavity 11, one-way valve body 12, umbrella skirt 13, top ring 14, through hole 15, slider 16, communication hole 17, limit boss 18. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please refer to Figures 1 to 7 , Figure 1 which is a cross-sectional view of the one-way filtration injection needle provided by the present invention; Figure 2 is Figure 1 a schematic structural view of the one-way valve in Figure 3 is Figure 1 a cross-sectional view of the one-way valve in Figure 4 is Figure 1 a cross-sectional view of the lower needle seat in Figure 5 is Figure 1 a top view of the lower needle seat in Figure 6 is a schematic view of the one-way filtration injection needle when the liquid medicine flows into Figure 1 ; Figure 7 is a schematic view of the one-way filtration injection needle when the liquid medicine flows out Figure 1 ;

[0029] The one-way filtration injection needle provided by the present invention, as Figure 1 shown, includes an upper needle seat 2 and a lower needle seat. The upper needle seat 2 is conical and has an opening at one end. The end of the upper needle seat 2 far from the opening is adhesively fixed to the needle tube 1. The opening end is hermetically connected to the lower needle seat by ultrasonic welding or adhesion. A cavity is formed between the upper needle seat 2 and the lower needle seat, and the needle tube 1 communicates with the cavity. The needle tube 1 can be made of stainless steel material, and the upper needle seat 2 and the lower needle seat can be made of polypropylene plastic or other plastics by injection molding.

[0030] A one-way valve is provided in the cavity. The structure of the one-way valve is as shown in Figure 2 and Figure 3As shown, it includes a cylindrical one-way valve body 12, the rear end of the one-way valve body 12 is sealed and connected to the lower needle seat, and the upper end is against the upper needle seat 2, so that the cavity is divided into a columnar space inside the one-way valve body 12 and an annular space outside the one-way valve body 12, and the needle tube 1 is located on the inner side of the one-way valve body 12. The one-way valve also includes a top ring 14 connected to the front end of the one-way valve body 12, and the inner diameter of the top ring 14 is smaller than the inner diameter of the one-way valve body 12, thereby forming a step surface facing the rear of the one-way valve body 12. The space inside the one-way valve body 12 behind the top ring 14 is the liquid inlet cavity 5, and the space outside the one-way valve body 12 is the liquid outlet cavity 11, and the liquid inlet cavity 5 and the liquid outlet cavity 11 are both connected to the inner side of the lower needle seat. The top ring 14 has a through hole 15 that penetrates in the radial direction, so that the liquid inlet cavity 5 is connected to the space inside the one-way valve body 12 behind the top ring 14. The outer periphery of the one-way valve body 12 is provided with an umbrella skirt 13, the length of which is greater than or equal to the width of the liquid outlet cavity 11, and a convex ring 3 is provided in the cavity behind the umbrella skirt 13, and the umbrella skirt 13 is made of materials such as silicone or rubber. In a specific embodiment of the present application, the one-way valve is made of silicone. Figure 6 As shown, the pressure on the side facing the lower needle seat is lower, and the umbrella skirt 13 is expanded under the action of the pressure difference and fits with the convex ring 3, so that the liquid outlet cavity 11 is sealed, and the liquid medicine flows into the inner side of the lower needle seat along the liquid inlet cavity 5. A slider 16 is provided in the liquid inlet cavity 5, and the diameter of the slider 16 is smaller than the inner diameter of the one-way valve body 12 and larger than the inner diameter of the top ring 14. When injecting liquid medicine, Figure 7 As shown, the pressure on the lower needle seat side is higher, and the slider 16 moves toward the top ring 14 under the action of the pressure difference and fits with the top ring 14, so that the liquid inlet cavity 5 is sealed, and the drug solution flows into the needle tube 1 along the liquid outlet cavity 11. Figure 6 and Figure 7 The arrow in the figure indicates the flow direction of the liquid medicine.

[0031] In addition, if Figure 7 As shown, when injecting the medicine, the umbrella skirt 13 curls toward the front end of the liquid outlet cavity 11 under the action of the pressure difference. A yield structure is provided at the front end of the liquid outlet cavity 11. The curled umbrella skirt 13 is spaced a preset distance from the front end of the liquid outlet cavity 11, thereby forming a liquid outlet flow channel at the front end of the liquid outlet cavity 11. The medicine enters the through hole 15 of the top ring 14 along the liquid outlet flow channel and is finally discharged from the needle tube 1.

[0032] Optionally, the yielding structure is a deformation groove 4 located at the front end of the liquid outlet cavity 11, the bottom of the deformation groove 4 is arc-shaped, and the distance between the deformation groove 4 and the root of the umbrella skirt 13 is greater than the length of the umbrella skirt 13, so that when the umbrella skirt 13 is curled, it can ensure smooth flow of the liquid medicine.

[0033] Optionally, the lower needle base includes a lower needle base body 7 and a needle base tip 6. The lower needle base body 7 is conical, and its diameter gradually increases in the direction away from the upper needle base. Specifically, the lower needle base body 7 is a 6:100 taper joint. The rear end of the lower needle base body 7 is used to connect to a syringe barrel or the like. The upper needle base 2 is sleeved on the front end of the lower needle base body 7, and the upper needle base 2 is also specifically a 6:100 taper joint. The needle base tip 6 is arranged at the center of the front end of the lower needle base body 7 and extends into the cavity. The one-way valve body 12 is sleeved on the outer periphery of the needle base tip 6 and is hermetically connected to the needle base tip 6. The needle base tip 6 has a communication hole 17 penetrating axially, and the communication hole 17 connects the liquid inlet chamber 5 and the inner side of the lower needle base. When extracting the liquid medicine, the liquid medicine enters the inner side of the lower needle base along the communication hole 17. In addition, the lower needle base is an integrally formed structural member, ensuring that the lower needle base has high strength.

[0034] Optionally, the diameter of the slider 16 is larger than the diameter of the communication hole 17. When extracting the liquid medicine, the front end of the needle base tip 6 abuts against the slider 16 to prevent the slider 16 from entering the inner side of the lower needle base. As Figure 4 and Figure 5 shown, a liquid flow groove 8 is provided at the front end of the needle base tip 6. When extracting the liquid medicine, the slider 16 abuts against the front end of the needle base tip 6, and the liquid flow groove 8 can connect the liquid inlet chamber 5 and the communication hole 17. The liquid medicine flows along the gap between the slider 16 and the one-way valve body 12 and enters the communication hole 17 through the liquid flow groove 8. Figure 5 The number of the middle liquid guide grooves is 6, and they are evenly distributed along the circumferential direction of the needle base tip 6. Users can also set the number and distribution form of the liquid guide grooves according to needs, which is not limited here.

[0035] Further, to facilitate the installation of the one-way valve on the needle base tip 6, a limiting boss 18 is provided on the outer periphery of the needle base tip 6. When installing the one-way valve, the one-way valve body 12 is sleeved on the needle base tip 6 until the rear end of the one-way valve body 12 abuts against the limiting boss 18.

[0036] Optionally, a filter hole 9 located on the outer periphery of the needle base tip 6 is provided at the front end of the lower needle base body 7. The filter hole 9 connects the liquid outlet chamber 11 and the inner side of the lower needle base. At the same time, the filter hole 9 is covered with a filter material, and the filter material can filter the liquid medicine when injecting the liquid medicine to prevent the bottle stopper or glass debris from entering the patient's body.

[0037] Further, a filter groove located on the outer periphery of the needle base tip 6 is provided on the end face of the lower needle base body 7 facing the cavity. The filter groove is annular, and the width of the filter groove is greater than or equal to the diameter of the filter hole 9. The filter hole 9 is located at the bottom of the filter groove. The filter material can specifically be a filter membrane 10. The filter membrane 10 is also annular and covers the notch of the filter groove and is fixed to the filter groove by means of bonding or ultrasonic welding, etc. In a specific embodiment of the present application, the filter membrane 10 is a polytetrafluoroethylene filter membrane 10. Of course, users can also select filter membranes 10 of other materials, which is not limited here.

[0038] In this embodiment, a one-way valve is provided in the one-way filtration injection needle. The one-way valve is respectively attached to the convex ring 3 and the slider 16 under the action of pressure difference when extracting and injecting the liquid medicine to achieve sealing. The sealing method of the two components being attached to each other can achieve sealing under a relatively small pressure difference, and at the same time, the sealing effect is more stable. When injecting the liquid medicine, the filter membrane 10 can filter out the debris in the liquid medicine, avoiding the debris from entering the patient's body and improving the safety of the injection process.

[0039] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0040] The one-way filtration injection needle provided by the present invention has been introduced in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A one-way filtering injection needle, characterized in that, The invention comprises an upper needle seat (2) and a lower needle seat which are sealed and connected, a cavity is formed between the upper needle seat (2) and the lower needle seat, a one-way valve is arranged in the cavity, the cavity comprises a liquid inlet cavity (5) located inside the one-way valve and a liquid outlet cavity (11) located outside the one-way valve, the liquid inlet cavity (5) and the liquid outlet cavity (11) are both connected to the inner side of the lower needle seat, the one-way valve comprises a cylindrical one-way valve body (12), a top ring (14) connected to the front end of the one-way valve body (12), and a one-way valve body (14) arranged An umbrella skirt (13) is arranged on the outer periphery of the one-way valve body (12); the top ring (14) has a through hole (15) penetrating in the radial direction; a convex ring (3) is provided in the cavity, which is in contact with the umbrella skirt (13) when extracting liquid medicine to seal the liquid outlet cavity (11); the inner diameter of the top ring (14) is smaller than the inner diameter of the one-way valve body (12); and a sliding block (16) is provided in the one-way valve body (12) when injecting liquid medicine to seal the liquid inlet cavity (5); The lower needle seat comprises a lower needle seat body (7) and a needle seat tip (6), wherein the needle seat tip (6) is arranged at the front end of the lower needle seat body (7), the one-way valve body (12) is sleeved on the outer periphery of the needle seat tip (6) and is sealedly connected to the needle seat tip (6), and the needle seat tip (6) has a connecting hole (17) which penetrates along the axial direction to connect the liquid inlet cavity (5) and the inner side of the lower needle seat body (7); The diameter of the slider (16) is smaller than the inner diameter of the one-way valve body (12) and larger than the diameter of the connecting hole (17); a liquid flow groove (8) is provided at the front end of the needle seat tip (6); when extracting liquid medicine, the slider (16) abuts against the front end of the needle seat tip (6); the liquid flow groove (8) can connect the liquid inlet cavity (5) and the inner side of the lower needle seat; The diameter of the slider (16) is larger than the inner diameter of the top ring (14); the slider (16) moves toward the top ring (14) under the action of the pressure difference and fits with the top ring (14), so that the liquid inlet cavity (5) is sealed; The front end of the lower needle seat body (7) is provided with a filter hole (9) located at the periphery of the needle seat tip (6) for connecting the liquid outlet cavity (11) and the inner side of the lower needle seat, and the filter hole (9) is covered with filter material.

2. The unidirectional filtration injection needle according to claim 1, wherein The lower needle seat body (7) is conical, and its diameter gradually increases in a direction away from the upper needle seat (2).

3. The one-way filtering injection needle according to claim 2, characterized in that, The end surface of the lower needle seat body (7) facing the cavity is provided with a filter groove located at the periphery of the needle seat tip (6), the filter groove is annular, the filter hole (9) is located at the bottom of the filter groove, and the filter material is a filter membrane (10) covering the notch of the filter groove.

4. The one-way filtering injection needle according to claim 3, wherein The outer periphery of the needle seat tip (6) is provided with a limiting boss (18) which abuts against the one-way valve body (12) to limit the position of the one-way valve body (12).

5. The unidirectional filtration injection needle according to any one of claims 1 to 4, characterized in that, The front end of the liquid outlet cavity (11) is provided with a giving way structure for giving way to the umbrella skirt (13) when injecting liquid medicine.

6. The unidirectional filtration injection needle according to claim 5, wherein The giving way structure is a deformation groove (4) located at the front end of the liquid outlet cavity (11).

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