A leak-proof sealing cap assembly of a medical disposable three-way valve and a connecting structure thereof

Abstract

The present application relates to the technical field of medical three-way valve, in particular to a leak-proof sealing cap assembly of medical disposable three-way valve and a connecting structure thereof. The leak-proof sealing cap assembly comprises a sealing body and an operating body which are sleeved on the pipeline interface of the three-way valve body. In the present application, after the narrow edge of the terminal is inserted into the second cylinder port, the lock hook is moved and clamped into the slot under the action of its own elastic force, realizing the combined installation of the terminal and the sleeve. By rotating the terminal, the lock hook drives the ball plug to move into the terminal against the elastic force of the outer spring, so that the liquid output by the syringe can enter the three-way valve body through the gap between the ball plug and the second cylinder port. When the syringe stops outputting, the terminal only needs to be reversed to drive the ball plug to reset and block the second cylinder port, thereby ensuring the sealing effect of the three-way valve under the premise of syringe injection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical three-way valves, in particular to a leak-proof sealing cap assembly of a medical disposable three-way valve and a connecting structure thereof. BACKGROUND

[0002] The medical three-way valve is a device used to control the flow of liquid in the medical field, mainly used for infusion, drainage and liquid merging / dividing operation. Its core function is to achieve precise control of fluid through three connection ports, which is commonly used in surgery, treatment and other scenarios.

[0003] The medical disposable three-way valve is a key connecting component in the infusion and injection treatment process, and a detachable or rotatable small cap structure is usually provided at the pipe interface for closing the channel, preventing liquid leakage or contamination during non-injection stage. However, the small cap of the traditional three-way valve is usually designed as a simple movable type, relying on manual tightening or pressing to achieve sealing, and the sealing effect is strongly dependent on the force and habit of the operator. In actual use, due to the lack of self-locking or positioning structure in the small cap, it is easy to loosen or even fall off due to accidental touch, pressure fluctuation or frequent operation, resulting in liquid leakage, which not only causes waste of medicine and environmental pollution, but also may cause microbial contamination, cross infection and other medical risks.

[0004] In addition, the three-way valve needs to be frequently connected to the syringe for liquid injection or suction operation in clinical application, and the traditional small cap is easy to wear and deform during repeated disassembly and installation, further reducing its sealing reliability. However, the existing structure often fails to balance the convenience of injection operation and the stability of sealing, i.e. while ensuring that the injection channel can be quickly and barrier-free opened, there is a lack of continuous and effective sealing mechanism in the closed state. SUMMARY

[0005] The purpose of the present application is to avoid the leakage problem of the small cap structure of the traditional three-way valve and the problem of unable to achieve effective sealing when connected to the syringe.

[0006] The purpose of the present application is to provide a leak-proof sealing cap assembly of a medical disposable three-way valve and a connecting structure thereof, which realizes sealing of the three-way valve through a spring and installation of two components, and realizes sealing injection of the syringe through rotation of the connecting structure.

[0007] To achieve the above purpose, one of the purposes of the present application is to provide a leak-proof sealing cap assembly of a medical disposable three-way valve, which comprises a sealing body sleeved on a pipe interface of a three-way valve body, the sealing body comprising a connecting pipe and a movable sleeve;

[0008] The connecting pipe comprises a sleeve sleeved on the pipe interface of the three-way valve body, and the sleeve is in communication with the pipe interface of the three-way valve body;

[0009] The activity kit comprises an activity rod and a ball plug mounted on one end of the activity rod, the activity rod is elastically connected with the inner wall of the sleeve and axially slides with the sleeve, the ball plug is located at the other end of the sleeve and is clamped with the inner wall of the sleeve, and a lock hook is arranged on the ball plug.

[0010] Under the elastic action of the activity rod, the activity rod moves axially along the sleeve, drives the ball plug to be clamped on the inner wall of the sleeve, and blocks the sleeve.

[0011] As a further improvement of the technical solution, the sleeve is a hollow pipe, first and second cylinder openings are arranged at two ends of the sleeve respectively, the first cylinder opening is in communication with the pipe interface of the three-way valve body, the ball plug is located in the second cylinder opening, an inner baffle is integrally formed in the sleeve, an activity limiting opening for liquid passing is arranged on the inner baffle, a rod cap is fixedly connected to one end of the activity rod penetrating through the inner baffle, an outer spring is arranged on the outer periphery of the activity rod and integrally formed with the inner baffle, and the outer spring is connected with the surface of the rod cap.

[0012] As a further improvement of the technical solution, a threaded head is fixedly connected to one end of the activity rod away from the rod cap, a threaded groove is arranged on the surface of the ball plug, the ball plug and the activity rod are threadedly connected through the threaded head and the threaded groove, a narrowing surface is arranged at the communication position between the second cylinder opening and the sleeve, and the diameter of the narrowing surface is smaller than that of the ball plug.

[0013] As a further improvement of the technical solution, a first gasket is arranged at the contact position between the ball plug and the narrowing surface, the inner diameter of the first gasket is consistent with the diameter of the narrowing surface, and a second gasket for preventing leakage is arranged at the position of the first cylinder opening in contact with the pipe interface of the three-way valve body.

[0014] The second object of the present application also provides a connecting structure of a leak-proof sealing cap assembly of the medical disposable three-way valve.

[0015] After the narrow edge of the terminal is inserted into the second barrel opening, the locking hook moves and is clamped into the slot under the action of its own elasticity, that is, at this time, under the action of the elastic force of the outer spring, the ball plug pulls the narrow edge through the locking hook, so as to realize the combined installation of the terminal and the sleeve, and by rotating the terminal, the locking hook drives the ball plug to move into the terminal against the elastic force of the outer spring.

[0016] As a further improvement of the technical solution, the locking hook comprises a pair of stems located in the through hole, and the two stems are connected by an inner spring.

[0017] As a further improvement of the technical solution, the slot is a spiral slot.

[0018] As a further improvement of the technical solution, a movable limiting opening is formed in the middle of the inner baffle, the movable limiting opening is matched with the cross-sectional shape of the movable rod, and the movable limiting opening is used to limit the axial movement of the movable rod along the sleeve.

[0019] As a further improvement of the technical solution, a hole block is arranged at the contact position of the stem and the inner spring, the hole block is in sliding fit with the through hole, the hole block is a square, and the opening of the through hole is matched with the shape of the hole block.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1. In the leak-proof sealing cap assembly of the medical disposable three-way valve and the connecting structure thereof, the ball plug is driven by the movable rod to move into the second barrel opening along the sleeve under the elastic force of the outer spring, and is clamped to avoid the second barrel opening, so as to realize sealing and avoid liquid leakage of the three-way valve.

[0022] 2. In the leak-proof sealing cap assembly of the medical disposable three-way valve and the connecting structure thereof, after the narrow edge of the terminal is inserted into the second barrel opening, the locking hook moves and is clamped into the slot under the action of its own elasticity, which realizes the combined installation of the terminal and the sleeve, and by rotating the terminal, the locking hook drives the ball plug to move into the terminal against the elastic force of the outer spring, so that the liquid output by the syringe can enter the three-way valve body through the gap between the ball plug and the second barrel opening. When the syringe stops outputting, the ball plug can be reset to block the second barrel opening by reversing the terminal, so as to ensure the sealing effect of the three-way valve under the premise of syringe injection. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic view of the connection and cooperation of the three-way valve and the sealing body and the operating body of the present application;

[0024] Figure 2 It is a sectional schematic view of the connection and cooperation of the three-way valve and the sealing body and the operating body of the present application;

[0025] Figure 3 Structure split cooperation schematic diagram of sealing body and operating body of the present application;

[0026] Figure 4 Structure split cooperation schematic diagram of sealing body and operating body of the present application;

[0027] Figure 5 Structure split cooperation schematic diagram of sealing body and operating body of the present application;

[0028] Figure 6 Structure split cooperation schematic diagram of sealing body and operating body of the present application;

[0029] Figure 7 Structure split cooperation schematic diagram of sealing body and operating body of the present application;

[0030] Figure 8 Structure split cooperation schematic diagram of sealing body and operating body of the present application;

[0031] Figure 9 Structure split cooperation schematic diagram of sealing body and operating body of the present application;

[0032] Figure 10 Structure split cooperation schematic diagram of sealing body and operating body of the present application.

[0033] The meanings of various labels in the figure are as follows:

[0034] 1. Three-way valve body;

[0035] 2. Sealing body; 21. Sleeve; 211. First barrel mouth; 212. Second barrel mouth; 22. Inner baffle; 221. Movable limiting port; 23. Movable rod; 231. Rod cap; 232. Threaded head; 24. Ball plug; 241. Threaded groove; 242. Through hole; 25. Stud; 251. Hole block; 26. First gasket; 27. Second gasket; 28. Inner spring;

[0036] 3. Operating body; 31. Terminal; 311. Narrow side; 312. Slot. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0040] The medical disposable three-way valve is a key connecting component in infusion and injection treatment, and its pipeline interface is usually equipped with a detachable or rotatable small cap structure for closing the channel, preventing liquid leakage or pollution during non-injection stage. However, the small cap of the traditional three-way valve is usually designed with a simple movable type, and the sealing effect highly depends on the manual tightening or pressing force and habit of the operator. In actual use, due to the lack of self-locking or positioning structure of the small cap, it is easy to loosen or even fall off due to accidental touch, pressure fluctuation or frequent operation, resulting in liquid leakage, which not only causes waste of medicine and environmental pollution, but also may cause microbial contamination and cross infection and other medical risks.

[0041] In addition, the three-way valve needs to be frequently connected to the syringe for liquid injection or suction operation in clinical application, and the traditional small cap is easy to wear and deform during frequent disassembly and installation, resulting in a decrease in sealing reliability, and there is no optimization for the connection of the syringe, which also causes the problem that the three-way valve cannot achieve effective sealing when connected to the syringe.

[0042] Therefore, please refer to Figure 1 , Figure 2 , Figure 3 It is one of the purposes of the present embodiment to provide a leak-proof sealing cap assembly of a medical disposable three-way valve, which comprises a sealing body 2 sleeved on the pipeline interface of a three-way valve body 1.

[0043] The sealing body 2 comprises a connecting pipe and a movable sleeve assembly.

[0044] The connecting pipe comprises a sleeve 21 sleeved on the pipeline interface of the three-way valve body 1, and the sleeve 21 communicates with the pipeline interface of the three-way valve body 1.

[0045] The activity kit comprises an activity rod 23 and a ball plug 24 mounted at one end of the activity rod 23, the activity rod 23 is elastically connected with the inner wall of the sleeve 21 and axially slides along the sleeve 21, and the ball plug 24 is located at the other end of the sleeve 21 and is in clamping fit with the inner wall of the sleeve 21, and the ball plug 24 is provided with a lock hook.

[0046] One end of the sleeve 21 is threadedly or in other forms mounted on the pipe interface of the three-way valve body 1 and fixedly connected, under the elastic action of the activity rod 23, the activity rod 23 moves axially along the sleeve 21, driving the ball plug 24 to be clamped on the inner wall of the sleeve 21, thereby plugging the other end of the sleeve 21, achieving the effect of plugging the pipe of the three-way valve.

[0047] The structure is disclosed as follows:

[0048] As shown in Figure 2 , Figure 3 , Figure 3 , Figure 5 , Figure 6 , the sleeve 21 is a hollow pipe, and the sleeve 21 is provided with a first barrel mouth 211 and a second barrel mouth 212 at two ends respectively, the first barrel mouth 211 is in communication with the pipe interface of the three-way valve body 1, the ball plug 24 is located in the second barrel mouth 212, the sleeve 21 is integrally formed with an inner baffle 22 near the middle position, the inner baffle 22 is provided with an activity limiting opening 221 for liquid to pass through, one end of the activity rod 23 penetrates through the inner baffle 22 and is fixedly connected with a rod cap 231, and an outer spring is sleeved on the outer periphery of the activity rod 23, the outer spring is a medical plastic compression spring and is integrally formed with the inner baffle 22, and the outer spring is connected with the surface of the rod cap 231.

[0049] The ball plug 24 is driven by the lock hook to move to the outside of the sleeve 21 against the elastic force of the outer spring, at this time, since the ball plug 24 is away from the second barrel mouth 212, liquid can be input or output to the pipe interface of the three-way valve body 1 through the gap between the second barrel mouth 212 and the ball plug 24; when it is needed to close the pipe interface of the three-way valve body 1, the lock hook is only loosened, and the ball plug 24 is driven by the activity rod 23 to axially enter the second barrel mouth 212 along the sleeve 21 under the elastic force of the outer spring, clamping the second barrel mouth 212 to achieve plugging, thereby avoiding the leakage of the three-way valve.

[0050] In order to ensure the plugging effect of the second barrel mouth 212, as shown in Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7As shown, the movable rod 23 is fixedly connected with a threaded head 232 at one end away from the rod cap 231, and the ball plug 24 is provided with a threaded groove 241 on the surface corresponding to the threaded head 232. The ball plug 24 is fixedly connected with the movable rod 23 through the threaded head 232 and the threaded groove 241. A narrowing surface is arranged at the inner communication position of the second barrel port 212 and the sleeve 21. The diameter of the narrowing surface is smaller than that of the ball plug 24. The first gasket 26 is arranged at the contact position of the ball plug 24 and the narrowing surface. The inner diameter of the first gasket 26 is consistent with the diameter of the narrowing surface. The second gasket 27 is arranged at the position of the first barrel port 211 which is in contact with the pipeline interface of the three-way valve body 1 to prevent leakage.

[0051] Under the elastic force of the outer spring, the movable rod 23 pulls the ball plug 24 to clamp the narrowing surface, so as to realize the sealing of the three-way pipe and avoid liquid leakage. The first gasket 26 and the second gasket 27 can prevent the ball plug 24 from being unable to completely seal the narrowing surface or the leakage at the position of the first barrel port 211 and the pipeline interface of the three-way valve body 1 due to manufacturing tolerance, thereby further ensuring the sealing effect of the three-way pipe.

[0052] Then, considering that the three-way valve needs to be frequently connected with the syringe in clinical application, in order to ensure effective sealing when the syringe is connected, please refer to Figure 1 、 Figure 2 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 、 Figure 10 As shown, the second purpose of the embodiment is to provide a connecting structure of the leakage-proof sealing cap assembly of the medical disposable three-way valve. The connecting structure comprises an operating body 3. The operating body 3 comprises a terminal 31 and a connecting pipe arranged at one end of the terminal 31. The terminal 31 is in communication with the syringe through the connecting pipe. The other end of the terminal 31 is provided with a narrow edge 311. One end of the narrow edge 311 is located in the insertion and cooperation with the sleeve 21 away from one end of the three-way valve body 1. The end surface of the narrow edge 311 is in contact with the first gasket 26. The ball plug 24 is provided with a through hole 242 penetrating the surface thereof. The lock hook is located in the through hole 242. The inner wall of the narrow edge 311 is symmetrically provided with a slot 312. One end of the lock hook is located in the slot 312 and is in sliding connection with the slot 312.

[0053] After the narrow edge 311 of the terminal 31 is inserted into the second barrel port 212, the locking hook moves and is clamped into the slot 312 under the action of its own elastic force. At this time, under the action of the elastic force of the outer spring, the ball plug 24 pulls the narrow edge 311 through the locking hook, so that the combination installation of the terminal 31 and the sleeve 21 is realized. By rotating the terminal 31, the locking hook drives the ball plug 24 to move into the terminal 31 against the elastic force of the outer spring, so that the liquid output by the syringe can enter the three-way valve body 1 through the gap between the ball plug 24 and the second barrel port 212. When the syringe stops outputting, the ball plug 24 can be reset to block the second barrel port 212 by reversing the terminal 31, thereby ensuring the sealing effect of the three-way valve.

[0054] Specifically, as shown in Figure 2 、 Figure 3 、 Figure 7 、 Figure 8 、 Figure 9 , the locking hook includes a pair of stems 25 located in the through hole 242. The two stems 25 are connected by the inner spring 28. When the narrow edge 311 is inserted, the narrow edge 311 contacts the inclined surface of the stem 25, so that the stem 25 moves into the through hole 242 against the elastic force of the inner spring 28. When the narrow edge 311 is completely inserted and installed, the two stems 25 move out of the through hole 242 under the action of the elastic force of the inner spring 28, until the stem 25 is clamped into the slot 312, thereby realizing the fixed installation of the narrow edge 311.

[0055] Further, the slot 312 is a spiral slot. By setting the slot 312 as a spiral slot, when the terminal 31 is rotated, the stem 25 drives the ball plug 24 to move through the sliding connection of the slot 312 and the stem 25, thereby facilitating the control of the movement of the ball plug 24 when the syringe is injecting or limiting. It is worth noting that when the terminal 31 is rotated, it is necessary to ensure that the ball plug 24 does not rotate synchronously, so as to realize the effect of controlling the axial movement of the ball plug 24 along the sleeve 21. Therefore, as shown in Figure 5 , the middle part of the inner baffle 22 is provided with a movable limiting port 221, and the movable limiting port 221 is matched with the cross-sectional shape of the movable rod 23. The movable limiting port 221 is used to limit the axial movement of the movable rod 23 along the sleeve 21. Here, it is exemplified that when the cross section of the movable rod 23 is square, the movable limiting port 221 is a square port, or when the cross section of the movable rod 23 is cross-shaped, the movable limiting port 221 is correspondingly a cross-shaped groove, so as to ensure that the movable rod 23 can only drive the ball plug 24 to move axially along the sleeve 21, and can avoid the situation that the stem 25 cannot normally drive the ball plug 24 to move due to the rotation of the ball plug 24 when the terminal 31 is rotated.

[0056] Considering the problem of machining error, in order to avoid the leakage of liquid from the outer wall of the terminal 31, as shown in Figure 2 、 Figure 10As shown, the outer wall of the terminal 31 is provided with a sealing rubber strip, and the inner wall of the sleeve 21 is provided with a sealing groove at the corresponding position, the sealing rubber strip is clamped into the sealing groove, so that the sealing can be realized, thereby avoiding the leakage of liquid from the outer wall of the terminal 31.

[0057] In addition, in order to ensure that the narrow edge 311 can be in contact with the inclined surface of the head 25 when inserted, the hole block 251 is arranged at the position where the head 25 is in contact with the inner spring 28, the hole block 251 is in sliding fit with the through hole 242, and the hole block 251 is a square, the opening of the through hole 242 is matched with the shape of the hole block 251, by arranging the square hole block 251 and the through hole 242 with the corresponding opening shape, the inclined surface of the hole block 251 is always aligned with the narrow edge 311, thereby ensuring that the narrow edge 311 can be in contact with the inclined surface of the head 25 when inserted, and the head 25 is pushed to shrink inward.

[0058] In summary, when not assembled and installed, under the action of the outer spring, the ball plug 24 is clamped on the narrow surface, and the head 25 is abutted against the inner wall of the sleeve 21 under the action of the inner spring 28; when the terminal 31 is inserted, the narrow edge 311 is in contact with the inclined surface of the head 25, so that the head 25 is moved into the through hole 242 against the elastic force of the inner spring 28, until the end surface of the narrow edge 311 is in contact with the first gasket 26, at this time, under the action of the inner spring 28, the head 25 is clamped into the slot 312, under the action of the outer spring, the ball plug 24 itself is clamped on the narrow surface, and the narrow edge 311 which keeps relative fixation with the ball plug 24 also keeps contact with the first gasket 26, thereby avoiding the leakage of the three-way tube, when injection or infusion is needed, the terminal 31 is rotated, the head 25 slides along the slot 312, and then drives the ball plug 24 to overcome the pulling force of the outer spring, the ball plug 24 moves away from the narrow surface, so that the liquid can pass through, and the terminal 31 is reversely rotated, so that the ball plug 24 is reset, thereby avoiding the leakage of the three-way tube.

[0059] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application, and are not intended to limit the present application, various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A leak-proof sealing cap assembly of a medical disposable three-way valve, comprising a sealing body (2) and an operating body (3) sleeved on the pipe interface of a three-way valve body (1), characterized in that: The sealing body (2) comprises a connecting pipe and a movable sleeve assembly; The connecting pipe comprises a sleeve (21) sleeved on the pipe interface of the three-way valve body (1), and the sleeve (21) is in communication with the pipe interface of the three-way valve body (1); The movable sleeve assembly comprises a movable rod (23) and a ball plug (24) mounted on one end of the movable rod (23), the movable rod (23) is elastically connected to the inner wall of the sleeve (21) and axially slides along the sleeve (21), the ball plug (24) is located at the other end of the sleeve (21) and is clamped to the inner wall of the sleeve (21), and a locking hook is arranged on the ball plug (24); Under the elastic action of the movable rod (23), the movable rod (23) moves axially along the sleeve (21) and drives the ball plug (24) to be clamped to the inner wall of the sleeve (21) to block the sleeve (21); The sleeve (21) is a hollow pipe, and first and second cylinder openings (211) and (212) are respectively arranged at two ends of the sleeve (21), the first cylinder opening (211) is in communication with the pipe interface of the three-way valve body (1), the ball plug (24) is located in the second cylinder opening (212), an inner baffle (22) is integrally formed in the sleeve (21), an active limiting opening (221) for liquid passing is arranged on the inner baffle (22), the active limiting opening (221) is used for limiting the axial movement of the movable rod (23), and an outer spring is arranged on the outer periphery of the movable rod (23); A narrowing surface is arranged at the communication position between the second cylinder opening (212) and the sleeve (21), and a first gasket (26) is arranged at the contact position between the ball plug (24) and the narrowing surface; The operation body (3) comprises a terminal (31) and a connecting pipe arranged at one end of the terminal (31), the terminal (31) is in communication with a syringe through the connecting pipe, a narrow edge (311) is arranged at the other end of the terminal (31), one end of the narrow edge (311) is inserted into the sleeve (21) away from the three-way valve body (1), the end face of the narrow edge (311) is in contact with the first gasket (26), a through hole (242) penetrating the surface of the ball plug (24) is arranged, the locking hook is located in the through hole (242), and grooves (312) are symmetrically arranged on the inner wall of the narrow edge (311); After the narrow edge (311) of the terminal (31) is inserted into the second cylinder opening (212), the locking hook is moved and clamped into the groove (312) under the elastic force of the locking hook, that is, under the elastic force of the outer spring, the ball plug (24) pulls the narrow edge (311) through the locking hook, so that the terminal (31) and the sleeve (21) are combined and installed, and the locking hook drives the ball plug (24) to move into the terminal (31) by rotating the terminal (31) and overcoming the elastic force of the outer spring; The notch (312) is a spiral notch.

2. The leak-proof, liquid-tight cap assembly for a medical, disposable, three-way valve of claim 1, wherein: One end of the movable rod (23) penetrates the inner baffle (22) and is fixedly connected with a rod cap (231), and the outer spring is integrally formed with the inner baffle (22), and the outer spring is connected with the surface of the rod cap (231).

3. The leak-free, sealed cap assembly for a medical disposable three-way valve of claim 2, wherein: The movable rod (23) is fixedly connected with a threaded head (232) at the end away from the rod cap (231), a threaded groove (241) is formed on the surface of the ball plug (24) in correspondence, the ball plug (24) and the movable rod (23) are threadedly connected through the threaded head (232) and the threaded groove (241), and the diameter of the narrowing surface is smaller than the diameter of the ball plug (24).

4. The leak-proof, liquid-tight, cap assembly for a medical, disposable, three-way valve of claim 3, wherein: The inner diameter of the first gasket (26) is consistent with the diameter of the narrowing surface, and a second gasket (27) for preventing leakage is arranged at the part of the first cylinder mouth (211) in contact with the pipeline interface of the three-way valve body (1).

5. The leak-proof, liquid-tight, cap assembly for a medical, disposable, three-way valve of claim 1, wherein: The lock hook comprises a pair of studs (25) arranged in the through hole (242), and the two studs (25) are connected by an inner spring (28).

6. The leak-proof, liquid-tight, cap assembly for a medical, disposable, three-way valve of claim 5, wherein: An active limiting opening (221) is formed in the middle of the inner baffle (22), the active limiting opening (221) is matched with the cross-sectional shape of the movable rod (23), and the active limiting opening (221) is used for limiting the axial movement of the movable rod (23) along the sleeve (21).

7. The leak-free, sealed cap assembly for a medical disposable three-way valve of claim 6, wherein: A hole block (251) is arranged at the contact position of the stud (25) and the inner spring (28), the hole block (251) is in sliding fit with the through hole (242), the hole block (251) is a square, and the opening of the through hole (242) is matched with the shape of the hole block (251).

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