Leakage-proof sealing cap assembly of medical disposable three-way valve and connecting structure of leakage-proof sealing cap assembly

Abstract

The invention relates to the technical field of medical three-way valves, in particular to a leakage-proof sealing cap assembly of a medical disposable three-way valve and a connecting structure of the leakage-proof sealing cap assembly. The sealing device comprises a sealing body and an operating body which are sleeved on a pipeline interface of the three-way valve body. According to the invention, after the narrow edge of the terminal is inserted into the second cylinder opening, the latch hook moves and is clamped into the notch under the action of the elastic force of the latch hook to realize the combined installation of the terminal and the sleeve, and the latch hook drives the ball plug to overcome the elastic force of the outer spring to move into the terminal by rotating the terminal. Therefore, liquid output by the injector can enter the three-way valve body through the gap between the ball plug and the second barrel opening, when the injector stops outputting, the ball plug can be driven to reset to block the second barrel opening only by reversing the terminal, and therefore the sealing effect of the three-way valve is ensured on the premise that injection of the injector is considered.

Description

Technical Field

[0001] The present invention relates to the technical field of medical three-way valves, in particular to a liquid leakage-proof sealing cap assembly of a disposable medical three-way valve and a connection structure thereof. Background Art

[0002] Medical three-way valves are devices used in the medical field to control the flow of fluids. They are primarily used for infusion, drainage, and fluid merging / diversion. Their core function is to precisely control fluid flow through three connection ports, and they are commonly used in surgical and treatment settings.

[0003] Medical disposable three-way valves are key connecting components in the process of infusion and injection treatment. Their pipe interfaces are usually equipped with a detachable or rotatable cap structure, which is used to close the channel during the non-injection stage and prevent the drug solution from leaking or being contaminated. However, the caps of traditional three-way valves are mostly simple movable designs, which rely on manual tightening or pressing to achieve sealing. The sealing effect is highly dependent on the strength and habits of the operator. In actual use, since the cap lacks a self-locking or positioning structure, it is easy to loosen or even fall off due to accidental touch, pressure fluctuations or frequent operation, resulting in drug leakage. This not only causes drug waste and environmental pollution, but is also likely to cause medical risks such as microbial contamination and cross-infection.

[0004] Furthermore, in clinical applications, three-way valves frequently require connection to syringes for injection or aspiration. Traditional caps are susceptible to wear and deformation during repeated removal and installation, further reducing their sealing reliability. Existing structures often fail to balance the convenience of injection operations with sealing stability. While ensuring quick and unobstructed opening of the injection channel, they lack a consistently effective sealing mechanism when closed. Summary of the Invention

[0005] The purpose of the present invention is to avoid the problem of easy leakage of the small cap structure of the traditional three-way valve and the problem of being unable to achieve effective sealing when docking with a syringe.

[0006] The purpose of the present invention is to provide a liquid-leakage-proof sealing cap assembly for a disposable medical three-way valve and its connection structure, which realizes the sealing of the three-way valve through a spring and realizes the connection and installation of the two components. At the same time, the sealed injection of the syringe can be achieved through the rotation of the connection structure.

[0007] To achieve the above objectives, one of the objectives of the present invention is to provide a liquid-leakage-proof sealing cap assembly for a disposable medical three-way valve, comprising a sealing body sleeved on a pipeline interface of a three-way valve body, the sealing body comprising a connecting pipe and a movable kit;

[0008] The connecting pipe includes a sleeve with one end sleeved on the three-way valve body pipeline interface, and the sleeve is communicated with the three-way valve body pipeline interface;

[0009] The movable kit includes a movable rod and a ball plug installed at one end of the movable rod. The movable rod is located in the sleeve and is elastically connected to the inner wall of the sleeve. The movable rod and the sleeve slide together along the axial direction of the sleeve. The ball plug is located at the other end of the sleeve and is engaged with the inner wall of the sleeve. A locking hook is provided on the ball plug.

[0010] Under the elastic action of the movable rod, the movable rod moves axially along the sleeve, driving the ball plug to be stuck on the inner wall of the sleeve to seal the sleeve.

[0011] As a further improvement of the present technical solution, the sleeve is a hollow pipe, and a first barrel opening and a second barrel opening are respectively provided at both ends of the sleeve. The first barrel opening is connected to the three-way valve body pipe interface, and the ball plug is located in the second barrel opening. An inner baffle is integrally formed in the sleeve, and a movable limiting opening for liquid to pass through is provided on the inner baffle. One end of the movable rod passes through the inner baffle and is fixedly connected to a rod cap. An outer spring is provided on the outer periphery of the movable rod, and the outer spring is integrally formed with the inner baffle, and the outer spring is connected to the surface of the rod cap.

[0012] As a further improvement of the present technical solution, the movable rod is fixedly connected with a threaded head at one end away from the rod cap, and a threaded groove is correspondingly provided on the surface of the ball plug. The ball plug and the movable rod are threadedly connected through the threaded head and the threaded groove, and a narrowing surface is provided at the connection between the second barrel mouth and the inside of the sleeve, and the diameter of the narrowing surface is smaller than the diameter of the ball plug.

[0013] As a further improvement of the present technical solution, a first gasket is provided at the contact point 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 is provided at the part of the first barrel mouth that contacts the three-way valve body pipeline interface to prevent leakage.

[0014] A second object of the present invention is to provide a connection structure for the liquid-leakage-proof sealing cap assembly of the above-mentioned disposable medical three-way valve, comprising an operating body, the operating body comprising a terminal and a connecting tube provided at one end of the terminal, the terminal being connected to the syringe via the provided connecting tube, the other end of the terminal being provided with a narrow edge, one end of the narrow edge being located to be plugged into and fitted with the end of the sleeve away from the three-way valve body, the end surface of the narrow edge being in contact with the first gasket, the ball plug being provided with a through hole penetrating its surface, the locking hook being located in the through hole, the inner wall of the narrow edge being symmetrically provided with notches, one end of the locking hook being located in the notch and being slidably connected to the notch;

[0015] After the narrow side of the terminal is inserted into the second barrel opening, the lock hook moves and is clamped into the slot under the action of its own elastic force. That is, at this time, under the elastic force of the external spring, the ball plug pulls the narrow side through the lock hook, thereby realizing the combined installation of the terminal and the sleeve, and by rotating the terminal, the lock hook drives the ball plug to overcome the elastic force of the external spring and move into the terminal.

[0016] As a further improvement of the present technical solution, the locking hook includes a pair of column heads located in the through hole, and the two column heads are connected by an internal spring.

[0017] As a further improvement of the present technical solution, the notch is a spiral groove.

[0018] As a further improvement of the present technical solution, a movable limiting opening is provided in the middle of the inner baffle, the movable limiting opening matches 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 present technical solution, a hole block is provided at the contact point between the column head and the inner spring, the hole block is slidably matched with the through hole, and the hole block is a cube, and the opening of the through hole matches the shape of the hole block.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the liquid leakage prevention sealing cap assembly and its connection structure of the disposable medical three-way valve, when the lock hook is released, the ball plug is driven by the movable rod along the axial direction of the sleeve under the elastic force of the external spring to enter the second barrel mouth, thereby blocking the second barrel mouth and achieving sealing, which can prevent leakage of the three-way valve.

[0022] 2. In the liquid-leakage-proof sealing cap assembly and its connection structure of the disposable medical three-way valve, after the narrow side of the terminal is inserted into the second barrel opening, the lock hook moves and snaps into the slot under the action of its own elastic force, thereby realizing the combined installation of the terminal and the sleeve. By rotating the terminal, the lock hook drives the ball plug to overcome the elastic force of the external spring and move into the terminal, 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, it only needs to reverse the terminal to drive the ball plug to reset and block the second barrel opening, thereby ensuring the sealing effect of the three-way valve while taking into account the injection of the syringe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the connection and coordination between the three-way valve, the sealing body and the operating body of the present invention;

[0024] Figure 2 It is a cross-sectional diagram of the connection and cooperation between the three-way valve, the sealing body and the operating body of the present invention;

[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 contamination 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 for 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 movable kit includes a movable rod 23 and a ball plug 24 installed at one end of the movable rod 23. The movable rod 23 is located in the sleeve 21 and is elastically connected to the inner wall of the sleeve 21. The movable rod 23 and the sleeve 21 slide together along the axial direction of the sleeve 21. The ball plug 24 is located at the other end of the sleeve 21 and is engaged with the inner wall of the sleeve 21. A locking hook is provided on the ball plug 24.

[0046] One end of the sleeve 21 is threaded or otherwise sleeved on the pipe interface of the three-way valve body 1 and kept fixedly connected. Under the elastic action of the movable rod 23, the movable rod 23 moves axially along the sleeve 21, driving the ball plug 24 to be stuck on the inner wall of the sleeve 21, thereby blocking the other end of the sleeve 21 and achieving the effect of blocking the three-way valve pipe.

[0047] The above structure is disclosed below:

[0048] like Figure 2 、 Figure 3 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the sleeve 21 is a hollow pipe, and a first tube opening 211 and a second tube opening 212 are respectively provided at both ends of the sleeve 21. The first tube opening 211 is connected to the pipeline interface of the three-way valve body 1, and the ball plug 24 is located in the second tube opening 212. An inner baffle 22 is integrally formed near the middle position in the sleeve 21, and a movable limit opening 221 for liquid to pass through is provided on the inner baffle 22. One end of the movable rod 23 passes through the inner baffle 22 and is fixedly connected to a rod cap 231. An outer spring is provided on the outer periphery of the movable rod 23. The outer spring is a medical plastic compression spring, and the outer spring is integrally formed with the inner baffle 22, and the outer spring is connected to the surface of the rod cap 231.

[0049] The locking hook drives the ball plug 24 so that the ball plug 24 overcomes the elastic force of the outer spring and moves toward the outside of the sleeve 21. At this time, since the ball plug 24 is away from the second tube opening 212, liquid can be input or output to the pipeline interface of the three-way valve body 1 through the gap between the second tube opening 212 and the ball plug 24; when the pipeline interface of the three-way valve body 1 needs to be closed, it is only necessary to loosen the locking hook, and the ball plug 24 can be driven by the movable rod 23 along the axial direction of the sleeve 21 under the elastic force of the outer spring to enter the second tube opening 212, thereby blocking the second tube opening 212, thereby achieving sealing and preventing leakage of the three-way valve.

[0050] In order to ensure the blocking effect on the second barrel opening 212, as shown in FIG. Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 7As shown, the movable rod 23 is fixedly connected to one end away from the rod cap 231 with a threaded head 232, and a threaded groove 241 is correspondingly provided on the surface of the ball plug 24. The ball plug 24 and the movable rod 23 are threadedly fixedly connected through the threaded head 232 and the threaded groove 241. A narrowing surface is provided at the connection between the second barrel mouth 212 and the sleeve 21. The diameter of the narrowing surface is smaller than the diameter of the ball plug 24, and a first gasket 26 is provided at the contact between 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. A second gasket 27 for preventing leakage is provided at the position in the first barrel mouth 211 that contacts the pipeline interface of the three-way valve body 1.

[0051] Under the elastic force of the external spring, the movable rod 23 pulls the ball plug 24 to clamp the narrowing surface, thereby achieving the closure of the three-way pipe and avoiding liquid leakage. In addition, by providing the first gasket 26 and the second gasket 27, it can prevent the ball plug 24 from failing to completely close the narrowing surface or leakage at the interface between the first barrel 211 and the three-way valve body 1 due to manufacturing tolerances, further ensuring the sealing effect of the three-way pipe.

[0052] Then, considering that the three-way valve needs to be frequently docked with syringes in clinical applications, in order to ensure effective sealing when docking the syringe, please refer to Figure 1 、 Figure 2 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 、 Figure 10 As shown, the second purpose of this embodiment is to provide a connection structure of the anti-leakage sealing cap assembly for the above-mentioned medical disposable three-way valve, including an operating body 3, the operating body 3 including a terminal 31 and a connecting tube arranged at one end of the terminal 31, the terminal 31 is connected to the syringe through the arranged connecting tube, and a narrow edge 311 is provided at the other end of the terminal 31, one end of the narrow edge 311 is located and plugged into the end of 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, the ball plug 24 is provided with a through hole 242 running through its surface, the locking hook is located in the through hole 242, the inner wall of the narrow edge 311 is symmetrically provided with a notch 312, and one end of the locking hook is located in the notch 312 and is slidably connected to the notch 312.

[0053] After the narrow side 311 of the terminal 31 is inserted into the second barrel opening 212, the locking hook moves and is clamped into the slot 312 under the action of its own elastic force. That is, at this time, under the elastic force of the external spring, the ball plug 24 pulls the narrow side 311 through the locking hook, thereby realizing the combined installation of the terminal 31 and the sleeve 21, and by rotating the terminal 31, the locking hook drives the ball plug 24 to overcome the elastic force of the external spring and move into the terminal 31, 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 opening 212. When the syringe stops outputting, it only needs to reverse the terminal 31 to drive the ball plug 24 to return to its original position to block the second barrel opening 212, thereby ensuring the sealing effect of the three-way valve.

[0054] Specifically, such as Figure 2 、 Figure 3 、 Figure 7 、 Figure 8 、 Figure 9 As shown, the lock hook includes a pair of studs 25 located in the through hole 242, and the two studs 25 are connected by an inner spring 28. When the narrow side 311 is inserted, the narrow side 311 contacts the inclined surface of the stud 25, so that the stud 25 overcomes the elastic force of the inner spring 28 and moves into the through hole 242. When the narrow side 311 is inserted and installed, the two studs 25 move out of the through hole 242 under the elastic force of the inner spring 28 until the stud 25 is stuck in the slot 312, thereby achieving fixed installation of the narrow side 311.

[0055] Furthermore, the notch 312 is a spiral groove. By setting the notch 312 as a spiral groove, when the terminal 31 is rotated, the notch 312 and the column head 25 are slidably connected, so that the column head 25 drives the ball plug 24 to move, thereby facilitating the control of the movement of the ball plug 24 when the syringe is injecting or restricting. 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 achieve the effect of controlling the axial movement of the ball plug 24 along the sleeve 21. Therefore, if Figure 5 A movable limiting opening 221 is provided in the middle of the inner baffle 22, and the movable limiting opening 221 matches the cross-sectional shape of the movable rod 23. The movable limiting opening 221 is used to limit the axial movement of the movable rod 23 along the sleeve 21. Here, for example, when the cross-section of the movable rod 23 is square, the movable limiting opening 221 is a square opening, or when the cross-section of the movable rod 23 is a cross, the movable limiting opening 221 corresponds to a cross groove, thereby ensuring that the movable rod 23 can only drive the ball plug 24 to move axially along the sleeve 21, which can avoid the situation where the column head 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 processing error, in order to avoid liquid leakage from the outer wall of terminal 31, as shown in FIG. Figure 2 、 Figure 10As shown, a sealing strip is provided on the outer wall of the terminal 31 , and a sealing groove is opened at a corresponding position on the inner wall of the sleeve 21 . The sealing strip is inserted into the sealing groove to seal the terminal 31 , thereby preventing liquid from leaking from the outer wall of the terminal 31 .

[0057] In addition, in order to ensure that the narrow side 311 can contact the inclined surface of the column head 25 when inserted, a hole block 251 is provided at the contact point between the column head 25 and the inner spring 28. The hole block 251 slides with the through hole 242, and the hole block 251 is a square. The opening of the through hole 242 matches the shape of the hole block 251. By providing 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 side 311, thereby ensuring that the narrow side 311 can contact the inclined surface of the column head 25 when inserted, pushing the column head 25 to retract inward.

[0058] In summary, when not assembled, under the action of the outer spring, the ball plug 24 is clamped on the narrow surface, and the column head 25 is pressed against the inner wall of the sleeve 21 under the action of the inner spring 28; when the terminal 31 is inserted, the narrow side 311 contacts the inclined surface of the column head 25, so that the column head 25 overcomes the elastic force of the inner spring 28 and moves into the through hole 242 until the end surface of the narrow side 311 contacts the first washer 26. At this time, under the action of the inner spring 28, the column head 25 moves and is clamped into the notch 312, and the outer spring Under the action of the ball plug 24 itself, the narrow surface is stuck, and the narrow side 311 relatively fixed to the ball plug 24 also maintains contact with the first gasket 26, thereby preventing liquid leakage from the tee. When injection or infusion is needed, the terminal 31 is rotated, and the column head 25 slides along the groove 312, thereby driving the ball plug 24 to overcome the tension of the outer spring, and the ball plug 24 moves away from the narrow surface, allowing liquid to pass through. The terminal 31 is rotated in the opposite direction to reset the ball plug 24, thereby preventing liquid leakage from the tee.

[0059] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid-leakage-proof sealing cap assembly for a disposable medical three-way valve, comprising a sealing body (2) sleeved on a pipe interface of a three-way valve body (1), characterized in that: The sealing body (2) comprises a connecting pipe and a movable kit; The connecting pipe comprises a sleeve (21) with one end 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 kit includes a movable rod (23) and a ball plug (24) installed at one end of the movable rod (23), the movable rod (23) is located in the sleeve (21) and is elastically connected to the inner wall of the sleeve (21), and the movable rod (23) and the sleeve (21) are axially slidably matched along the sleeve (21), the ball plug (24) is located at the other end of the sleeve (21), the ball plug (24) is snap-fitted with the inner wall of the sleeve (21), and a locking hook is provided on the ball plug (24); Under the elastic action of the movable rod (23), the movable rod (23) moves axially along the sleeve (21), driving the ball plug (24) to be stuck on the inner wall of the sleeve (21), thereby sealing the sleeve (21).

2. The liquid-leakage-proof sealing cap assembly of a disposable medical three-way valve according to claim 1, characterized in that: The sleeve (21) is a hollow pipe, and a first tube opening (211) and a second tube opening (212) are respectively provided at both ends of the sleeve (21), the first tube opening (211) is communicated with the pipe interface of the three-way valve body (1), and the ball plug (24) is located in the second tube opening (212). An inner baffle (22) is integrally formed in the sleeve (21), and a movable limit opening (221) for liquid to pass through is provided on the inner baffle (22). One end of the movable rod (23) passes through the inner baffle (22) and is fixedly connected to a rod cap (231). An outer spring is provided on the outer periphery of the movable rod (23), and the outer spring is integrally formed with the inner baffle (22), and the outer spring is connected to the surface of the rod cap (231).

3. The liquid-leakage-proof sealing cap assembly of a disposable medical three-way valve according to claim 2, characterized in that: The movable rod (23) is fixedly connected to one end thereof away from the rod cap (231) with a threaded head (232), and a threaded groove (241) is correspondingly provided on the surface of the ball plug (24). The ball plug (24) and the movable rod (23) are threadedly connected via the threaded head (232) and the threaded groove (241). A narrowing surface is provided at the connection point between the second barrel opening (212) and the inner portion of the sleeve (21), and the diameter of the narrowing surface is smaller than the diameter of the ball plug (24).

4. The liquid-leakage-proof sealing cap assembly for a disposable medical three-way valve according to claim 3, characterized in that: A first gasket (26) is provided at the contact point between the ball plug (24) and the narrowing surface, and the inner diameter of the first gasket (26) is consistent with the diameter of the narrowing surface. A second gasket (27) is provided at the portion of the first barrel opening (211) that contacts the pipeline interface of the three-way valve body (1) for preventing leakage.

5. A connection structure for a liquid-leakage-proof sealing cap assembly of a disposable medical three-way valve according to any one of claims 1 to 4, characterized in that: The operating body (3) includes the terminal (31) and a connecting tube provided at one end of the terminal (31), the terminal (31) is connected to the syringe through the provided connecting tube, the other end of the terminal (31) is provided with a narrow edge (311), one end of the narrow edge (311) is plugged into and matched with the end of the sleeve (21) away from the three-way valve body (1), the end face of the narrow edge (311) contacts the first gasket (26), the ball plug (24) is provided with a through hole (242) penetrating the surface thereof, the locking hook is located in the through hole (242), the inner wall of the narrow edge (311) is symmetrically provided with a notch (312), and one end of the locking hook is located in the notch (312) and is slidably connected to the notch (312); After the narrow side (311) of the terminal (31) is inserted into the second barrel opening (212), the lock hook moves and snaps into the slot (312) under the action of its own elastic force. That is, at this time, under the elastic force of the external spring, the ball plug (24) pulls the narrow side (311) through the lock hook, thereby realizing the combined installation of the terminal (31) and the sleeve (21), and by rotating the terminal (31), the lock hook drives the ball plug (24) to overcome the elastic force of the external spring and move into the terminal (31).

6. The connection structure of the liquid-leakage-proof sealing cap assembly of the disposable medical three-way valve according to claim 5, characterized in that: The locking hook comprises a pair of column heads (25) located in the through hole (242), and the two column heads (25) are connected via an inner spring (28).

7. The connection structure of the liquid-leakage-proof sealing cap assembly of the disposable medical three-way valve according to claim 6, characterized in that: The notch (312) is a spiral groove.

8. The connection structure of the liquid-leakage-proof sealing cap assembly of the disposable medical three-way valve according to claim 7, characterized in that: A movable limiting opening (221) is provided in the middle of the inner baffle (22), the movable limiting opening (221) matches the cross-sectional shape of the movable rod (23), and the movable limiting opening (221) is used to limit the axial movement of the movable rod (23) along the sleeve (21).

9. The connection structure of the liquid-leakage-proof sealing cap assembly of the disposable medical three-way valve according to claim 8, characterized in that: A hole block (251) is provided at the contact point between the column head (25) and the inner spring (28), the hole block (251) and the through hole (242) are slidably matched, and the hole block (251) is a cube, and the opening of the through hole (242) matches the shape of the hole block (251).

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