Double-membrane one-way valve

Abstract

The utility model discloses a double-membrane one-way valve which comprises a first connector, an anti-backflow piece and a second connector which are sequentially connected in a matched mode, and the interiors of the first connector, the anti-backflow piece and the second connector are sequentially communicated. The anti-backflow part comprises a first check block, a first membrane, a support, a second check block and a second membrane, the first membrane and the second membrane are arranged on the upper side and the lower side of the support respectively, a first through hole is formed in the first membrane, the first check block is arranged on the inner wall of the first channel and abuts against the first membrane, and the position of the first check block corresponds to the position of the first through hole; the second diaphragm is provided with a second through hole, the second check block is arranged on the inner wall of the second channel and abuts against the second diaphragm, and the position of the second check block corresponds to the position of the second through hole. The first diaphragm and the first stop block are matched for use, the second diaphragm and the second stop block are matched for use, so that liquid medicine is prevented from flowing to the first connector from the second connector, liquid medicine backflow in the infusion process can be effectively eradicated, and the effect of blocking germs is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a double-membrane one-way valve. Background Art

[0002] In the field of clinical medicine, one-way valves are widely used as accessories for intravascular drug delivery devices. The one-way valve is connected to a drug delivery device and an intravenous indwelling needle through a drug delivery tube to prevent the backflow of liquid medicine. In clinical use, when only a small amount or a trace amount of liquid medicine needs to be input into a patient's body, non-disposable drug delivery devices are often used. The non-disposable drug delivery device, the drug delivery tube, the one-way valve, the infusion tube, and the intravenous indwelling needle are connected in sequence. During use, the non-disposable drug delivery device and the drug delivery tube can be reused within a certain period of time, while the one-way valve, the infusion tube, and the intravenous indwelling needle in direct contact with the patient need to be replaced as the patient is replaced.

[0003] Most of the one-way valves in the prior art are single-membrane one-way valves, and the anti-backflow effect is unstable. During use, the patient's blood may still flow back due to changes in the pressure inside the tube or other uncontrollable factors, and part of the liquid medicine may flow back to the drug delivery tube through the one-way valve, resulting in the entry of germs in the patient's body into the drug delivery tube and contaminating the drug delivery tube and the non-disposable drug delivery device. When other patients use the non-disposable drug delivery device again, it is very easy to cause disease transmission and cross-infection. Therefore, the single-membrane one-way valve applied to the infusion pipeline of non-disposable drug delivery devices in the prior art is prone to technical defects such as liquid medicine backflow and contamination of non-disposable drug delivery devices during use. Summary of the Utility Model

[0004] A double-membrane one-way valve provided by the utility model is applied to the infusion pipeline of non-disposable drug delivery devices, aiming to solve the technical defect that the single-membrane one-way valve in the prior art is prone to liquid medicine backflow and contamination of non-disposable drug delivery devices during use.

[0005] The utility model discloses a double - membrane one - way valve, which comprises a first joint, an anti - backflow member, and a second joint that are sequentially and cooperatively connected; a first channel is arranged inside the first joint, a second channel is arranged in the anti - backflow member, a third channel is arranged inside the second joint, and the first channel, the second channel, and the third channel are sequentially communicated; the anti - backflow member includes: a first stop block, a first membrane, a bracket, a second stop block, and a second membrane. The second channel is arranged in the bracket, and the first joint, the bracket, and the second joint are sequentially and cooperatively connected. The first membrane and the second membrane are respectively arranged on the upper and lower sides of the bracket. A first through - hole is arranged on the first membrane. The first stop block is connected to the inner wall of the first channel, the bottom of the first stop block abuts against the first membrane, and the position of the first stop block corresponds to the position of the first through - hole; a second through - hole is arranged on the second membrane. The second stop block is connected to the inner wall of the second channel, the bottom of the second stop block abuts against the second membrane, and the position of the second stop block corresponds to the position of the second through - hole; the first membrane and the second membrane respectively cooperate with the first stop block and the second stop block to achieve unidirectional liquid flow.

[0006] Wherein, one end of the bracket close to the first joint is provided with a first annular abutting layer and a second annular abutting layer. The second annular abutting layer is arranged inside the first annular abutting layer, and a first annular groove is formed between the first annular abutting layer and the second annular abutting layer; one end of the first joint close to the bracket is provided with a first annular plugging layer adapted to the first annular groove, and the first annular plugging layer is plugged into the first annular groove.

[0007] Wherein, one end of the second joint close to the bracket is provided with a third annular abutting layer and a fourth annular abutting layer. The fourth annular abutting layer is arranged inside the third annular abutting layer, and a second annular groove is formed between the third annular abutting layer and the fourth annular abutting layer; one end of the bracket close to the second joint is provided with a second annular plugging layer adapted to the second annular groove, and the second annular plugging layer is plugged into the second annular groove.

[0008] Wherein, the first membrane includes a first support ring and a first baffle. The first baffle covers one end of the first support ring. The first through - hole is arranged at the central position of the first baffle. The outer peripheral surface of the first support ring abuts against the inner side of the second annular abutting layer, and the upper side of the first baffle abuts against the bottom of the first stop block.

[0009] Among them, the second diaphragm includes a second support ring and a second baffle. The second baffle covers one end of the second support ring. The second through hole is provided at the center position of the second baffle. The outer peripheral surface of the second support ring abuts against the inner side of the fourth annular abutting layer. The upper side surface of the second baffle abuts against the bottom of the second baffle block.

[0010] Preferably, the first diaphragm and the second diaphragm are silicone diaphragms, but are not limited thereto.

[0011] Among them, the size of the first through hole is smaller than that of the first baffle block, and the size of the second through hole is smaller than that of the second baffle block.

[0012] Among them, a first boss ring is provided on the inner wall of the second channel along the radial direction. One end of the first support ring away from the first baffle abuts against the first boss ring; a second boss ring is provided on the inner wall of the third channel along the radial direction. One end of the second support ring away from the second baffle abuts against the second boss ring.

[0013] Preferably, a first liquid passing hole is provided between the first baffle block and the inner wall of the first channel, and a second liquid passing hole is provided between the second baffle block and the inner wall of the second channel.

[0014] Preferably, the first joint is one of a male joint, a female joint or a straight joint; the second joint is one of a male joint, a female joint or a straight joint, but is not limited thereto.

[0015] A double-diaphragm one-way valve disclosed by the present utility model includes a first joint, an anti-backflow member, and a second joint which are sequentially connected in cooperation. The anti-backflow member includes a first baffle block, a first diaphragm, a bracket, a second baffle block, and a second diaphragm. A first through hole is provided on the first diaphragm, and a second through hole is provided on the second diaphragm. In the present utility model, by arranging the cooperation of the first diaphragm and the first baffle block, and the second diaphragm and the second baffle block, in case of pressure change in the infusion tube or other uncontrollable factors causing the backflow of the liquid medicine, the hydraulic pressure makes the second diaphragm move towards the second baffle block, and the first diaphragm move towards the first baffle block. The second baffle block blocks the second through hole, and the first baffle block blocks the first through hole. Through the double-blocking effect, the backflow of the liquid medicine can be effectively prevented, and the technical effects of blocking germs and preventing the contamination of non-disposable drug delivery devices can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 The overall structure diagram of the double - membrane one - way valve disclosed in the embodiment of the present utility model;

[0018] Figure 2 The sectional view of the double - membrane one - way valve disclosed in the embodiment of the present utility model;

[0019] Figure 3 Disclosed in the embodiment of the present utility model Figure 2 The enlarged structure diagram of part A;

[0020] Figure 4 The structure diagram of the first membrane and the second membrane disclosed in the embodiment of the present utility model;

[0021] Figure 5 The connection structure diagram of the first stop block and the first channel disclosed in the embodiment of the present utility model;

[0022] Figure 6 The overall structure diagram of the female double - membrane one - way valve disclosed in the embodiment of the present utility model;

[0023] Figure 7 The overall structure diagram of the male double - membrane one - way valve disclosed in the embodiment of the present utility model;

[0024] Reference numerals:

[0025] 100, female joint; 200, male joint; 300, straight - through joint; 400, fin; 1, first joint; 11, first channel; 111, liquid inlet; 12, first annular insertion layer; 2, anti - backflow part; 21, second channel; 22, first stop block; 221, first liquid - passing hole; 222, first connection part; 23, first membrane; 231, first through - hole; 232, first support ring; 233, first stop piece; 24, bracket; 241, first annular abutting layer; 242, second annular abutting layer; 243, first annular groove; 244, second annular insertion layer; 25, second stop block; 251, second liquid - passing hole; 26, second membrane; 261, second through - hole; 262, second support ring; 263, second stop piece; 27, first boss ring; 3, second joint; 31, third channel; 311, liquid outlet; 32, third annular abutting layer; 33, fourth annular abutting layer; 34, second annular groove; 35, second boss ring; Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0027] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0028] It should also be understood that the terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. As used in the specification and the appended claims of the present utility model, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0029] It should be further understood that the term "and / or" used in the specification and the appended claims of the present utility model refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0030] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

[0031] The present utility model discloses a double - membrane one - way valve, which is used in cooperation with the infusion pipeline of a non - disposable drug delivery device. The double - membrane one - way valve includes a first joint 1, a back - flow prevention member 2, and a second joint 3 that are sequentially and cooperatively connected. Please refer to Figure 1 and Figure 2, one end of the first connector 1 is provided with a liquid inlet 111, and a first channel 11 communicating with the liquid inlet 111 is arranged inside the first connector 1. A second channel 21 is arranged in the anti-backflow member 2. One end of the second connector 3 is provided with a liquid outlet 311, and a third channel 31 communicating with the liquid outlet 311 is arranged inside the second connector 3. The first channel 11, the second channel 21, and the third channel 31 are sequentially connected and form a communicating pipeline. The liquid medicine flows in from the liquid inlet 111, sequentially flows through the first channel 11, the second channel 21, and the third channel 31, and flows out from the liquid outlet 311 to realize the forward flow of the liquid medicine.

[0032] Among them, please refer to Figure 3 , for Figure 2 the enlarged structure diagram of part A in, the anti-backflow member 2 includes: a first stopper 22, a first diaphragm 23, a bracket 24, a second stopper 25, and a second diaphragm 26. A second channel 21 is arranged in the bracket 24. Specifically, the second channel 21 is arranged through the bracket 24. The first connector 1, the bracket 24, and the second connector 3 are sequentially connected in cooperation; the first diaphragm 23 and the second diaphragm 26 are respectively abutted on the upper and lower sides of the bracket 24. A first through hole 231 is arranged on the first diaphragm 23, and a second through hole 261 is arranged on the second diaphragm 26. The liquid medicine flows into the second channel 21 through the first through hole 231 and flows into the third channel 31 through the second through hole 261; the first stopper 22 is connected to the inner wall of the first channel 11. Specifically, please refer to Figure 5 , which is the connection structure diagram of the first stopper 22 and the first channel 11 disclosed in the embodiment of the present invention (the cross-sectional view of the double-membrane one-way valve perpendicular to the liquid flow direction at the first stopper 22). The first stopper 22 is connected to the inner wall of the first channel 11 through a first connecting portion 222. The size of the first stopper 22 is smaller than that of the first channel 11, and a first liquid passing hole 221 is arranged between the first stopper 22 and the inner wall of the first channel 11. Specifically, the first liquid passing hole 221 is surrounded by the first stopper 22, the first connecting portion 222, and the inner wall of the first channel 11. In this embodiment, the number of the first liquid passing holes 221 is three. The liquid medicine sequentially flows through the first liquid passing hole 221 and the first through hole 231 and enters the second channel; the bottom of the first stopper 22 abuts against the first diaphragm 23, and the position of the first stopper 22 corresponds to the position of the first through hole 231.

[0033] The second stopper 25 is connected to the inner wall of the second channel 21. The connection structure between the second stopper 25 and the second channel 21 is similar to the connection structure between the first stopper 22 and the first channel 11. The size of the second stopper 25 is smaller than that of the second channel 21, and a second liquid passing hole 251 is provided between the second stopper 25 and the inner wall of the second channel 21. The liquid medicine flows through the second liquid passing hole 251 and the second through hole 261 in sequence and then flows into the third channel 31. The bottom of the second stopper 25 abuts against the second diaphragm 26, and the position of the second stopper 25 corresponds to the position of the second through hole 261. The first diaphragm 23 and the second diaphragm 26 cooperate with the first stopper 22 and the second stopper 25 respectively to enable the liquid medicine to flow from the first channel 11 to the third channel 31 or block the liquid medicine from flowing from the third channel 31 to the first channel 11.

[0034] When the liquid medicine flows forward, the liquid medicine flows into from the first channel 11. Under the action of the gravity of the liquid medicine, the first diaphragm 23 is pressed downwards. The first diaphragm 23 deforms and a gap is formed between the first diaphragm 23 and the first stopper 22. The liquid medicine flows through the gap and flows into the second channel 21 through the first through hole 231, and then presses down the second diaphragm 26. The second diaphragm 26 deforms and a gap is formed between the second diaphragm 26 and the second stopper 25. The liquid medicine flows through the gap and flows into the third channel through the second through hole 261. In case of reverse flow of the liquid medicine, the liquid medicine flows into from the third channel 31. Under the action of the hydraulic pressure, the second diaphragm 26 moves towards the second stopper 25, and the second through hole 261 on the second diaphragm 26 is blocked by the second stopper 25, which can block the continuous flow of the liquid medicine. Part of the liquid medicine flowing into the second channel 21 presses the first diaphragm 23 towards the first stopper 22, and the first through hole 231 on the first diaphragm 23 is blocked by the first stopper 22. Through double blocking, the liquid medicine can be effectively prevented from flowing into the first channel 11.

[0035] Specifically, please refer to Figure 3 , a first annular abutting layer 241 and a second annular abutting layer 242 are provided at one end of the bracket 24 close to the first joint 1. The second annular abutting layer 242 is arranged inside the first annular abutting layer 241, and a first annular groove 243 is formed between the first annular abutting layer 241 and the second annular abutting layer 242. A first annular inserting layer 12 adapted to the first annular groove 243 is provided at one end of the first joint 1 close to the bracket 24, and the first annular inserting layer 12 is inserted into the first annular groove 243.

[0036] On the inner side wall of the first annular groove 243 and the outer wall of the first annular insertion layer 12, there are respectively provided matching threads (not shown in the figure). Specifically, on the side of the first annular abutting layer 241 close to the first annular insertion layer 12, there is a first thread, and on the side of the first annular insertion layer 12 close to the first annular abutting layer 241, there is a second thread adapted to the first thread. The first annular insertion layer 12 is screwed into the first annular groove 243 to enable the bracket 24 to be tightly assembled with the first joint 1. During assembly, an adhesive can also be applied to the connection between the first annular groove 243 and the first annular insertion layer 12 for bonding. After the adhesive cures, the tightness of the assembly between the first joint 1 and the bracket 24 can be further ensured.

[0037] Wherein, at one end of the second joint 3 close to the bracket 24, there are provided a third annular abutting layer 32 and a fourth annular abutting layer 33. The fourth annular abutting layer 33 is arranged inside the third annular abutting layer 32, and a second annular groove 34 is formed between the third annular abutting layer 32 and the fourth annular abutting layer 33. At one end of the bracket 24 close to the second joint 3, there is provided a second annular insertion layer 244 adapted to the second annular groove 34, and the second annular insertion layer 244 is inserted into the second annular groove 34.

[0038] Similarly, the second annular groove 34 and the second annular insertion layer 244 can also be connected by means of threaded connection or bonding to further ensure the tight assembly of the bracket 24 and the second joint 3.

[0039] Specifically, please refer to Figure 4, the first diaphragm 23 includes a first support ring 232 and a first retaining piece 233. Specifically, the first support ring 232 is in an annular structure, and the first retaining piece 233 covers one end of the first support ring 232. The first diaphragm 23 can be manufactured by an injection molding process, or the first support ring 232 and the first retaining piece 233 can be bonded to manufacture the first diaphragm 23. In this embodiment, the first diaphragm 23 is manufactured by an injection molding process; the first through hole 231 is disposed at the center position of the first retaining piece 233, the outer peripheral surface of the first support ring 232 abuts against the inner side of the second annular abutting layer 242, and the upper side surface of the first retaining piece 233 abuts against the bottom of the first retaining block 22; the structure of the second diaphragm 26 is the same as that of the first diaphragm 23. The second diaphragm 26 includes a second support ring 262 and a second retaining piece 263. The second retaining piece 263 covers one end of the second support ring 262. In this embodiment, the second diaphragm 26 is manufactured by an injection molding process. The second through hole 261 is disposed at the center position of the second retaining piece 263. The outer peripheral surface of the second support ring 262 abuts against the inner side of the fourth annular abutting layer 33, and the upper side surface of the second retaining piece 263 abuts against the bottom of the second retaining block 25; when the liquid medicine flows from the third channel 31 to the second channel 21, the hydraulic pressure causes the second retaining piece 263 to move in the direction of the second retaining block 25, and the second through hole 261 is blocked by the second retaining block 25, which can prevent the liquid medicine from entering the second channel 21. When part of the liquid medicine entering the second channel 21 moves upward, it causes the first retaining piece 233 to move in the direction of the first retaining block 22, and the first through hole 231 is blocked by the first retaining piece 233, which can prevent the liquid medicine from entering the first channel 11, effectively preventing the reverse flow of the liquid medicine.

[0040] The first diaphragm 23 and the second diaphragm 26 are silicone diaphragms. The silicone diaphragm has good elasticity. When the liquid medicine flows in the forward direction, the liquid medicine flows in from the first channel 11. Under the action of the gravity of the liquid medicine, the first diaphragm 23 can deform and move away from the first retaining block 22 to form a gap, and the second diaphragm 26 deforms and moves away from the second retaining block 25 to form a gap. The liquid medicine flows through the gap into the first through hole 231 and the second through hole 261 to realize the forward flow of the liquid medicine; when the liquid medicine flows in the reverse direction, the liquid medicine flows from the third channel 31 to the second channel 21, and the hydraulic pressure causes the second diaphragm 26 to move in the direction of the second retaining block 25. Due to the good elasticity of the silicone diaphragm, the second diaphragm 26 can be well attached to the second retaining block 25, and the second retaining block 25 fully blocks the second through hole 261 to prevent the liquid medicine from entering the second channel; moreover, the silicone diaphragm also has good corrosion resistance and wear resistance. Under the long-term immersion of chemical media such as liquid medicine, its performance will not be affected, which can effectively ensure the service life of the first diaphragm 23 and the second diaphragm 26, and thus ensure the reliability of the double-diaphragm one-way valve.

[0041] Specifically, the size of the first through hole 231 is smaller than that of the first stopper 22, and the size of the second through hole 261 is smaller than that of the second stopper 25, so that when the liquid medicine flows backward, the second stopper 25 can completely block the second through hole 261, and the first stopper 22 can completely block the first through hole 231.

[0042] Wherein, a first boss ring 27 is arranged radially on the inner wall of the second channel 21, and one end of the first support ring 232 away from the first flap 233 abuts against the first boss ring 27 to limit the first diaphragm 23 and prevent the first diaphragm 23 from moving with the flow of the liquid medicine; a second boss ring 35 is arranged radially on the inner wall of the third channel 31, and one end of the second support ring 262 away from the second flap 263 abuts against the second boss ring 35 to fix the position of the second diaphragm 26 and prevent the second diaphragm 26 from moving with the flow of the liquid medicine.

[0043] Wherein, the first connector 1 is one of a male connector 200, a female connector 100 or a straight connector 300, and the second connector 3 is one of a male connector, a female connector or a straight connector. According to the use requirements, the first connector 1 and the second connector 3 can be selected, and the double - diaphragm one - way valve in the present utility model can be applied to the infusion pipeline containing different types of connectors.

[0044] In the first embodiment, both the first connector 1 and the second connector 3 are selected as the straight connector 300 to obtain a straight double - diaphragm one - way valve. Please refer to Figure 1, install the straight-through double-membrane one-way valve in the infusion pipeline of the non-disposable drug delivery device. The non-disposable drug delivery device, the drug delivery tube, the straight-through double-membrane one-way valve, the infusion tube, and the venous indwelling needle are connected in sequence. Specifically, during implementation, the drug delivery tube is inserted into the liquid inlet 111 of the first joint 1, and the infusion tube is inserted into the liquid outlet 311 of the second joint 3. The connection is bonded with an adhesive. During infusion, the liquid medicine flows in from the liquid inlet 111. Under the action of the gravity of the liquid medicine, the liquid medicine presses down the first diaphragm 23. Since the first diaphragm 23 is a silicone diaphragm and has a certain elasticity, the first diaphragm 23 deforms and a gap is formed between the first diaphragm 23 and the first stopper 22. The liquid medicine flows into the second channel 21 from the gap and presses down the second diaphragm 26. The second diaphragm 26 deforms and a gap is formed between the second diaphragm 26 and the second stopper 25. The liquid medicine flows out from the second joint 3 through the liquid outlet 311, realizing the forward flow of the liquid medicine. In case of reverse flow of the liquid medicine, the liquid medicine flows in from the second joint 3. Under the action of hydraulic pressure, the second diaphragm 26 moves towards the second stopper 25, and the second stopper 25 blocks the second through-hole 261 to block the continuous flow of the liquid medicine into the second channel 21. For the part of the liquid medicine that enters the second channel 21, it makes the first diaphragm 23 move towards the first stopper 22, and the first stopper 22 blocks the first through-hole 231, which can prevent the liquid medicine from continuing to enter the first channel 11. Through the cooperation of the second diaphragm 26 and the second stopper 25, and the cooperation of the first diaphragm 23 and the first stopper 22, double blocking of the liquid medicine can be achieved, effectively preventing the reverse flow of the liquid medicine, thereby achieving the technical effect of blocking germs and preventing the contamination of non-disposable drug delivery devices.

[0045] In the second embodiment, please refer to Figure 6 , the first joint 1 is selected as a straight-through joint 300, and the outer periphery of the straight-through joint 300 is provided with a wing 400 for easy holding. The second joint 3 is selected as a female joint 100, and the female joint 100 is a joint with a thread on the outer periphery of the end, obtaining a female double-membrane one-way valve. Specifically, during implementation, the drug delivery tube is inserted into the straight-through joint 300, and the connection is bonded with an adhesive. The female joint 100 is connected to a connection joint with a male end thread on the infusion tube, and the female double-membrane one-way valve can be applied to the infusion pipeline containing different types of joints. The flow of the liquid medicine in the female double-membrane one-way valve is similar to the flow of the liquid medicine in the straight-through double-membrane one-way valve, which will not be elaborated here.

[0046] In the third embodiment, please refer to Figure 7 , the first joint 1 is selected as a male joint 200, and the outer periphery of the male joint 200 is provided with a wing 400 for easy holding. The second joint 3 is selected as a straight-through joint 300, obtaining a male double-membrane one-way valve. Specifically, during implementation, the male double-membrane one-way valve is installed in the infusion pipeline. The male joint 200 is connected to another female joint 100 on the infusion tube by threading or other screwing methods. The flow of the liquid medicine in the male double-membrane one-way valve is similar to the flow of the liquid medicine in the straight-through double-membrane one-way valve and the female double-membrane one-way valve, which will not be elaborated here.

[0047] A double - membrane one - way valve disclosed by the utility model is applied to the infusion pipeline of non - disposable drug delivery devices, and includes a first connector, an anti - backflow member, and a second connector that are sequentially and cooperatively connected. The anti - backflow member includes a first stopper, a first diaphragm, a bracket, a second stopper, and a second diaphragm. The first diaphragm is provided with a first through - hole, and the second diaphragm is provided with a second through - hole. In the utility model, by setting the cooperation of the first diaphragm and the first stopper, and the second diaphragm and the second stopper, in case of liquid medicine backflow, the hydraulic pressure makes the second diaphragm move towards the direction of the second stopper, and the second stopper blocks the second through - hole. For part of the liquid medicine entering the second channel, it makes the first diaphragm move towards the direction of the first stopper, and the first stopper blocks the first through - hole, which can achieve double blocking of the liquid medicine, thus effectively preventing the backflow of the liquid medicine, and achieving the effects of blocking germs and preventing the pollution of non - disposable drug delivery devices; Moreover, in this technology, a first annular groove and a second annular insertion layer are respectively arranged at both ends of the bracket. A first annular insertion layer adapted to the first annular groove is arranged on the first connector, and a second annular groove adapted to the second annular insertion layer is arranged on the second connector. The first annular insertion layer is inserted into the first annular groove and connected by means of screw connection or bonding, and the second annular insertion layer is inserted into the second annular groove and connected by means of screw connection or bonding, which can effectively ensure the tightness of the connection between the first connector, the anti - backflow member, and the second connector, and further ensure the reliability of the double - membrane one - way valve during use.

[0048] As described above, it is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by this application, and these modifications or substitutions should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A double-membrane one-way valve, characterized in that, It includes a first joint, a backflow prevention member, and a second joint that are sequentially fitted and connected. A first channel is provided inside the first joint, a second channel is provided in the backflow prevention member, and a third channel is provided inside the second joint. The first channel, the second channel, and the third channel are sequentially connected and communicated; The backflow prevention member includes: a first stopper, a first diaphragm, a bracket, a second stopper, and a second diaphragm. The second channel is provided in the bracket, and the first joint, the bracket, and the second joint are sequentially fitted and connected; the first diaphragm and the second diaphragm are respectively provided on the upper and lower sides of the bracket. A first through hole is provided on the first diaphragm. The first stopper is connected to the inner wall of the first channel, and the bottom of the first stopper abuts against the first diaphragm, and the position of the first stopper corresponds to the position of the first through hole; a second through hole is provided on the second diaphragm. The second stopper is connected to the inner wall of the second channel, and the bottom of the second stopper abuts against the second diaphragm, and the position of the second stopper corresponds to the position of the second through hole; the first diaphragm and the first stopper cooperate, and the second diaphragm and the second stopper cooperate to achieve unidirectional liquid flow.

2. The dual-membrane one-way valve according to claim 1, characterized in that, One end of the bracket close to the first joint is provided with a first annular abutting layer and a second annular abutting layer. The second annular abutting layer is provided inside the first annular abutting layer, and a first annular groove is formed between the first annular abutting layer and the second annular abutting layer; One end of the first joint close to the bracket is provided with a first annular plugging layer adapted to the first annular groove, and the first annular plugging layer is plugged into the first annular groove.

3. The double-membrane one-way valve according to claim 2, wherein One end of the second joint close to the bracket is provided with a third annular abutting layer and a fourth annular abutting layer. The fourth annular abutting layer is provided inside the third annular abutting layer, and a second annular groove is formed between the third annular abutting layer and the fourth annular abutting layer; One end of the bracket close to the second joint is provided with a second annular plugging layer adapted to the second annular groove, and the second annular plugging layer is plugged into the second annular groove.

4. The double-membrane one-way valve according to claim 3, characterized in that, The first diaphragm includes a first support ring and a first blocking piece. The first blocking piece covers one end of the first support ring. The first through hole is provided at the central position of the first blocking piece. The outer peripheral surface of the first support ring abuts against the inner side of the second annular abutting layer, and the upper side surface of the first blocking piece abuts against the bottom of the first stopper.

5. The double-membrane one-way valve according to claim 4, wherein, The second diaphragm includes a second support ring and a second blocking piece. The second blocking piece covers one end of the second support ring. The second through hole is provided at the central position of the second blocking piece. The outer peripheral surface of the second support ring abuts against the inner side of the fourth annular abutting layer, and the upper side surface of the second blocking piece abuts against the bottom of the second stopper.

6. The double-membrane one-way valve according to claim 1, wherein The first diaphragm and the second diaphragm are silicone diaphragms.

7. The double-membrane one-way valve according to claim 1, wherein, The size of the first through hole is smaller than that of the first stopper, and the size of the second through hole is smaller than that of the second stopper.

8. The dual-film one-way valve according to claim 5, characterized in that, A first boss ring is provided on the inner wall of the second channel along the radial direction, and one end of the first support ring away from the first baffle is abutted against the first boss ring; a second boss ring is provided on the inner wall of the third channel along the radial direction, and one end of the second support ring away from the second baffle is abutted against the second boss ring.

9. The dual-membrane one-way valve according to claim 1, wherein A first liquid passing hole is provided between the first stop block and the inner wall of the first channel, and a second liquid passing hole is provided between the second stop block and the inner wall of the second channel.

10. The double-membrane one-way valve according to claim 1, characterized in that, The first joint is one of a male joint, a female joint or a straight joint; the second joint is one of a male joint, a female joint or a straight joint.

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