Passive one-way medical three-way valve

Abstract

The invention discloses a passive one-way medical three-way valve, relates to the technical field of medical instruments, and aims to solve the technical problems that when an existing three-way valve needs to switch an infusion path or prevent liquid from flowing back, manual operation of medical staff is often needed, the workload of the medical staff is increased, and the safety and effectiveness of infusion are affected. Comprising a cylindrical valve body, a valve seat is fixedly installed in the valve body, two adjacent input ports are fixedly formed in the outer side face of the valve body, and elastic elements are fixedly installed in the outlet ends of the input ports. When liquid or gas is injected from the input port, the pressure enables the plugging piece to overcome the elastic force of the elastic element to be opened, and the passive opening and closing type infusion device has the advantages that the passive opening and closing effect is achieved, the manual adjusting step is omitted, and infusion safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to a passive one-way medical three-way valve. Background Art

[0002] During medical procedures, patients often need to be given infusions, blood transfusions, drug injections, and blood sample extractions. In these operations, medical three-way valves are widely used to connect and switch between different pipelines and control the flow of fluids.

[0003] The existing three-way valve has some functional defects. When it is necessary to switch the infusion path or prevent liquid reflux, medical staff often need to operate manually. This not only increases the workload of medical staff, but also may cause liquid reflux and contamination due to human negligence during the operation, affecting the safety and effectiveness of the infusion. In view of this, we propose a passive one-way medical three-way valve. Summary of the Invention

[0004] The purpose of the present invention is to provide a passive one-way medical three-way valve to solve the problem that the current three-way valve often requires manual operation by medical staff when switching the infusion path or preventing liquid reflux, which increases the workload of technical medical staff and affects the safety and effectiveness of infusion.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a passive one-way medical three-way valve, comprising a cylindrical valve body, a valve seat fixedly mounted inside the valve body, two adjacent input ports fixedly disposed on the outer side of the valve body, an elastic element fixedly mounted inside the outlet ends of the input ports, a blocking member for blocking the outlet ends of the input ports mounted inside the elastic element, and a connected output port integrally formed at the bottom of the valve body; The valve seat includes a column, and a valve port corresponding to the position of the input port and the sealing member is opened on the outer wall of the column. A C-shaped flow cavity is constructed inside the column, and the two ends of the C-shaped flow cavity are respectively connected to the outlet ends of the two input ports.

[0006] The present invention provides unidirectional conductivity through the provision of an elastic element and a sealing member. When liquid or gas is injected into the input port, the pressure causes the sealing member to open, overcoming the elastic force of the elastic element. The medium can enter the C-shaped flow cavity through the valve port and then flow out of the bottom output port. When external pressure disappears or reverse pressure exists, the elastic element resets the sealing member, blocking the outlet of the input port and preventing backflow of the medium. This ensures unidirectional flow of the medium, helps avoid cross-infection and other problems, and also eliminates the need to manually switch the infusion path, reducing the probability of human error and improving infusion safety.

[0007] Preferably, the side surface of the C-shaped flow cavity close to the outlet end of the top input port is constructed with a downwardly inclined guide surface, and the side surfaces of the C-shaped flow cavity are all smooth surfaces.

[0008] Preferably, the elastic element comprises a fixing ring, a plurality of metal springs are fixedly provided on the inner ring surface of the fixing ring, and an elastic ring sleeved on the outside of the blocking member is fixedly connected between the side ends of the plurality of metal springs.

[0009] Preferably, the blocking member comprises a hollow column, a limiting circular plate is fixedly provided on the top of the hollow column, and a blocking plate having the same diameter as the outlet end of the input port is fixedly provided on the bottom of the hollow column.

[0010] Preferably, the top of the blocking plate is constructed with an upwardly protruding diverter slope, and the diameter of the junction surface between the diverter slope and the blocking plate is the same as the inner diameter length of the outlet end of the input port.

[0011] Preferably, a plurality of extension grooves are formed through the surface of the metal spring, and the shape of the extension grooves is rectangular.

[0012] Preferably, a liquid injection cavity is provided between the two ends of the input port, and a plurality of elastic clips engaged with a fixing ring are fixedly provided on the inner wall of the liquid injection cavity.

[0013] Preferably, a slot is provided on the outer side of the elastic ring, and a limiting ring is embedded in the inner side of the slot.

[0014] Preferably, a plurality of retaining grooves are provided on the side of the elastic ring that is in contact with the hollow column, and a retaining block that is engaged with the retaining grooves is fixedly provided on the outer wall of the hollow column.

[0015] Preferably, a positioning groove is provided on the inner wall of the side end of the valve body that is in contact with the valve seat, and a positioning block that is combined with the positioning groove is fixed to the side end of the valve seat.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides unidirectional conductivity through the provision of an elastic element and a sealing member. When liquid or gas is injected into the input port, the pressure causes the sealing member to open, overcoming the elastic force of the elastic element. The medium can enter the C-shaped flow cavity through the valve port and then flow out from the bottom output port. When external pressure disappears or reverse pressure exists, the elastic element resets the sealing member, blocking the outlet of the input port and preventing the medium from flowing back. This ensures unidirectional flow of the medium, helps avoid cross-infection and other problems, and also saves the step of manually switching the infusion path, reducing the probability of human error and improving the safety of the infusion.

[0017] 2. The present invention also adopts the design of a C-shaped flow cavity, so that the outlet ends of the two input ports do not interfere with each other, and at the same time has a certain flow blocking effect, reducing the probability of liquid reflux. In addition, the sides of the C-shaped flow cavity are all smooth surfaces. Such a design is conducive to guiding the medium to flow smoothly from the input port to the output end, reducing flow resistance, reducing energy loss, and enabling the medium to pass through the three-way valve more efficiently, further improving the smoothness of one-way infusion.

[0018] 3. The elastic element in the present invention adopts a combined structure of a fixing ring, a metal spring and an elastic ring. The metal spring provides elastic force, and the elastic ring facilitates the connection and combination with the sealing member. The card groove on the outside of the elastic ring cooperates with the limit ring to fix the size of the elastic ring, so that it is not easy to deform when pulled downward, thereby improving the stability of the connection. Such a structural combination is easy to manufacture and reduce the difficulty of manufacturing. At the same time, the extension groove opened on the surface of the metal spring can increase the flexibility of the metal spring while ensuring elasticity, so that it can withstand multiple expansion and contraction deformations without being easily damaged, further extending the service life of the three-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cutaway structure of the present invention; Figure 3 Schematic diagram of the cross-section structure of the valve seat in the present invention; Figure 4 Schematic diagram of the cross-section structure of the input port in the present invention; Figure 5 Schematic diagram of the cross-section structure of the elastic element in the present invention; Figure 6 for Figure 5 Schematic enlargement of the structure in part A.

[0020] Description of the numbers in the figure: 1. Valve body; 101. Positioning groove; 102. Positioning cylinder; 2. Valve seat; 201. Column; 202. Valve port; 203. C-type flow cavity; 204. Guide surface; 205. Positioning block; 3. Input port; 301. Liquid injection cavity; 302. Elastic clamp; 4. Elastic element; 401. Fixing ring; 402. Metal spring; 403. Elastic ring; 404. Extension groove; 405. Clamping groove; 406. Limiting ring; 407. Guide slope; 408. Clamping groove; 5. Blocking piece; 501. Hollow column; 502. Limiting circular plate; 503. Blocking plate; 504. Diverter slope; 505. Clamping block; 6. Output port. DETAILED DESCRIPTION

[0021] like Figures 1 to 6As shown, the present invention relates to a passive one-way medical three-way valve, comprising a cylindrical valve body 1, a valve seat 2 fixedly installed inside the valve body 1, two adjacent input ports 3 fixedly provided on the outer side of the valve body 1, an elastic element 4 fixedly installed inside the outlet end of the input port 3, a blocking piece 5 for blocking the outlet end of the input port 3 installed on the inner side of the elastic element 4, and a connected output end 6 integrally formed at the bottom of the valve body 1; each structure is made of medical-grade non-toxic, corrosion-resistant plastic or metal material, the outlet end can be blocked by the elastic element 4 and the blocking piece 5 installed inside the input port 3, and when pressurized by the medium, the elastic element 4 can bend to cause the blocking piece 5 to displace, thereby achieving the effect of automatically releasing the blockage, and a positioning cylinder 102 is fixedly provided on the outside of the installation position of the valve body 1 at the input port 3, which can fix the installation position of the input port 3.

[0022] The valve seat 2 includes a column 201, and a valve port 202 corresponding to the position of the input port 3 and the sealing member 5 is opened on the outer wall of the column 201. The interior of the column 201 is constructed with a C-shaped flow cavity 203, and the two ends of the C-shaped flow cavity 203 are respectively connected to the outlet ends of the two input ports 3; the opening of the valve port 202 facilitates the flow of the medium into the C-shaped flow cavity 203. The shape design of the C-shaped flow cavity 203 makes it difficult for the medium flowing in from the top to flow to the side end position, thereby achieving a certain flow blocking effect. At the same time, it is also convenient for both ends to transport the medium to the position of the output end 6, thereby achieving a three-way effect.

[0023] In an embodiment of the present invention, the side surface of the C-shaped flow cavity 203 close to the outlet end of the top input port 3 is constructed with a downwardly inclined guide surface 204, and the side surfaces of the C-shaped flow cavity 203 are all smooth surfaces; because the side surface of the C-shaped flow cavity 203 close to the outlet end of the top input port 3 is constructed with a downwardly inclined guide surface 204, and the side surfaces of the C-shaped flow cavity 203 are all smooth surfaces, this enables the medium to flow smoothly in the C-shaped flow cavity 203, reducing resistance and turbulence during the flow process.

[0024] In an embodiment of the present invention, the elastic element 4 includes a fixing ring 401, the inner ring surface of the fixing ring 401 is fixedly provided with a plurality of metal spring sheets 402, and the side ends of the plurality of metal spring sheets 402 are fixedly connected with an elastic ring 403 sleeved on the outside of the blocking member 5, and the blocking member 5 includes a hollow column 501, the top of the hollow column 501 is fixedly provided with a limiting circular plate 502, and the bottom of the hollow column 501 is fixedly provided with a blocking plate 503 with the same diameter as the outlet end of the input port 3; by sleeved on the outside of the blocking member 5 by the elastic ring 403, the combined connection operation of the two can be facilitated, and the manufacturing is easy; the setting of the blocking plate 503 can limit the installation position of the elastic ring 403, so that when the blocking member 5 is pressurized by the medium, the elastic ring 403 pulls the connected metal spring sheet 402 to bend, thereby achieving the effect of automatic displacement, and when the pressure is reduced, it can be reset by the rebound effect of the metal spring sheet 402 itself, so that the blocking plate 503 is re-fitted with the outlet end of the input port 3.

[0025] In an embodiment of the present invention, the top of the sealing plate 503 is constructed with an upwardly protruding diverter slope 504, and the diameter of the joint surface between the diverter slope 504 and the sealing plate 503 is the same as the inner diameter length of the outlet end of the input port 3; the diverter slope 504 on the top of the sealing plate 503 can divert the medium evenly to both sides when the medium flows in, avoiding the concentrated impact of the medium on one side, and further improving the smoothness of the movement of the sealing plate 503.

[0026] In an embodiment of the present invention, a plurality of extension grooves 404 are formed through the surface of the metal spring 402, and the extension grooves 404 are rectangular in shape. The extension grooves 404 formed on the surface of the metal spring 402 can increase the flexibility of the metal spring 402 while ensuring elasticity, so that the metal spring 402 can withstand multiple expansion and contraction deformations without being easily damaged.

[0027] In an embodiment of the present invention, an injection cavity 301 is provided between the two ends of the input port 3, and a plurality of elastic clips 302 are fixed on the inner wall of the injection cavity 301 to be engaged with the fixing ring 401; through the arrangement of the elastic clips 302, when the fixing ring 401 is installed inside the injection cavity 301, the bottom of the elastic clips 302 can be squeezed and deformed under the action of the guide slope 407, so that the fixing ring 401 can be moved to the inner side of the elastic clips 302 to achieve the effect of clamping and limiting.

[0028] In an embodiment of the present invention, a slot 405 is provided on the outer side of the elastic ring 403, and a limiting ring 406 is embedded in the inner side of the slot 405; the setting of the slot 405 facilitates fixing the position of the limiting ring 406, and the limiting ring 406 is fixed to the inner side of the slot 405 by bending and winding, thereby reducing the probability of deformation of the elastic ring 403 caused by pulling, and improving the stability of the combined connection.

[0029] In an embodiment of the present invention, a plurality of latching grooves 408 are provided on the side where the elastic ring 403 and the hollow column 501 are in contact, and a latching block 505 combined with the latching groove 408 is fixed on the outer wall of the hollow column 501; through the combination of the latching groove 408 and the latching block 505, the position of the connection between the elastic ring 403 and the hollow column 501 can be limited, which makes it less likely to deviate and improves the stability of the connection.

[0030] In an embodiment of the present invention, a positioning groove 101 is provided on the inner wall of the side end where the valve body 1 and the valve seat 2 fit together, and a positioning block 205 is fixedly provided on the side end of the valve seat 2 to be combined with the positioning groove 101; the cooperation between the two can fix the connection position during assembly and fixation, and is not easy to shift.

[0031] Working Principle: This embodiment provides a passive, one-way medical three-way valve. When no medium is input, the elastic element 4 within the input port 3 is in its natural state, and the sealing member 5 inside the elastic element 4 tightly seals the outlet of the input port 3. Specifically, the sealing plate 503 in the sealing member 5 is in contact with the outlet of the input port 3. The cooperation between the limiting circular plate 502 and the elastic ring 403 restricts the position of the hollow column 501. The metal spring 402 of the elastic element 4 exerts an inward force on the sealing member 5 through the elastic ring 403, maintaining the sealing state and ensuring the stability of the seal. When a medium, such as liquid medicine or gas, is input through the top input port 3, the pressure generated by the medium acts on the sealing member 5. As the pressure gradually increases, it overcomes the elastic force of the elastic element 4. Specifically, the medium pressure pushes the sealing plate 503 and the limiting circular plate 502 of the sealing member 5, causing the hollow column 501 to move in the direction of pressure. At this time, the metal spring 402 of the elastic element 4 bends, causing the sealing plate 503 to separate from the outlet end of the input port 3, making it easier for the medium to pass through the outlet end of the input port 3 and enter the C-shaped flow cavity 203 inside the column 201 of the valve seat 2, allowing the medium to flow in the C-shaped flow cavity 203. Since the side of the C-shaped flow cavity 203 near the outlet end of the top input port 3 is constructed with a downward-sloping guide surface 204, and the side surfaces of the C-shaped flow cavity 203 are all smooth surfaces, this allows the medium to flow smoothly in the C-shaped flow cavity 203, reducing resistance and turbulence during the flow process. Finally, the medium flows out from the valve port 202 connected to the bottom of the C-shaped flow cavity 203, is output through the output end 6 integrally formed at the bottom of the valve body 1, and is transported to the desired location. When the medium stops being input and the pressure in the input port 3 gradually decreases to a level equal to or lower than the external pressure, the metal spring 402 of the elastic element 4, under the action of its own elastic restoring force, pushes the hollow column 501 of the blocking member 5 toward the outlet of the input port 3, allowing the blocking plate 503 to re-adhere tightly to the outlet of the input port 3 and re-block the port. This effectively prevents the medium from flowing back from the output port 6 or other input ports 3 to the port where the medium has been input, avoids cross-contamination between different media, and ensures the safety and effectiveness of the use of media during medical procedures.

[0032] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A passive one-way medical three-way valve, characterized in that: The invention comprises a cylindrical valve body (1), a valve seat (2) being fixedly mounted inside the valve body (1), two adjacent input ports (3) being fixedly mounted on the outer side of the valve body (1), an elastic element (4) being fixedly mounted inside the outlet end of the input port (3), a blocking member (5) for blocking the outlet end of the input port (3) being mounted inside the elastic element (4), and a connected output port (6) being integrally formed at the bottom of the valve body (1); The valve seat (2) comprises a column (201), the outer wall of which is provided with a valve port (202) corresponding to the position of the input port (3) and the blocking member (5), the interior of the column (201) is provided with a C-shaped flow cavity (203), and the two ends of the C-shaped flow cavity (203) are respectively connected to the outlet ends of the two input ports (3).

2. The passive one-way medical three-way valve according to claim 1, characterized in that: The side surface of the C-shaped flow cavity (203) close to the outlet end of the top input port (3) is constructed with a downwardly inclined flow guide surface (204), and the side surfaces of the C-shaped flow cavity (203) are all smooth surfaces.

3. The passive one-way medical three-way valve according to claim 1, characterized in that: The elastic element (4) comprises a fixing ring (401), the inner ring surface of which is fixedly provided with a plurality of metal springs (402), and the side ends of the plurality of metal springs (402) are fixedly connected with an elastic ring (403) sleeved on the outside of the blocking member (5).

4. The passive one-way medical three-way valve according to claim 3, characterized in that: The blocking member (5) comprises a hollow column (501), a limiting circular plate (502) is fixedly provided on the top of the hollow column (501), and a blocking plate (503) having the same diameter as the outlet end of the input port (3) is fixedly provided on the bottom of the hollow column (501).

5. The passive one-way medical three-way valve according to claim 4, characterized in that: The top of the blocking plate (503) is constructed with an upwardly protruding diverter slope (504), and the diameter of the junction surface between the diverter slope (504) and the blocking plate (503) is the same as the inner diameter length of the outlet end of the input port (3).

6. The passive one-way medical three-way valve according to claim 3, characterized in that: A plurality of extension grooves (404) are provided through the surface of the metal spring (402), and the extension grooves (404) are rectangular in shape.

7. The passive one-way medical three-way valve according to claim 3, characterized in that: A liquid injection cavity (301) is provided between the two ends of the input port (3), and a plurality of elastic clamping members (302) that are clamped to the fixing ring (401) are fixedly provided on the inner wall of the liquid injection cavity (301).

8. The passive one-way medical three-way valve according to claim 4, characterized in that: A slot (405) is provided on the outer side of the elastic ring (403), and a limiting ring (406) is embedded inside the slot (405).

9. The passive one-way medical three-way valve according to claim 4, characterized in that: A plurality of latching grooves (408) are provided on the side of the elastic ring (403) that fits the hollow column (501), and a latching block (505) that is coupled with the latching grooves (408) is fixedly provided on the outer wall of the hollow column (501).

10. The passive one-way medical three-way valve according to claim 4, characterized in that: A positioning groove (101) is provided on the inner wall of the side end where the valve body (1) and the valve seat (2) are in contact, and a positioning block (205) coupled to the positioning groove (101) is fixedly provided on the side end of the valve seat (2).

Images