Anti-backflow positive pressure three-way valve

Abstract

The invention relates to the technical field of medical infusion tools, and discloses an anti-backflow positive pressure three-way valve which is composed of an injector body, a positive pressure connector connecting mechanism, an anti-backflow valve body mechanism and an anti-backflow positive pressure three-way valve mechanism. The anti-backflow positive-pressure three-way valve mechanism is installed at the bottom of the anti-backflow valve body mechanism in the mode that an inserting column penetrates through a second airtight diaphragm, a valve body rotary knob is rotated to drive a valve element communicating column to rotate, liquid can be controlled to be discharged from a first connecting pipe or a second connecting pipe, liquid backflow is efficiently prevented, the anti-backflow valve body mechanism achieves one-way flow limiting, and an injector is prevented from flowing back during infusion. A sealing gasket in the positive pressure connector connecting mechanism guarantees the sealing performance of a connector, positive pressure can be formed in the connector and the catheter when the first sealing diaphragm is reset, blood backflow is prevented, and the sealing performance of the connector is improved. The three-way valve effectively overcomes the defects of an existing device in the aspects of preventing liquid backflow and controlling the flow direction, and the three-way valve can better serve clinical medical operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical infusion tools, and specifically to an anti-backflow positive pressure three-way valve. Background Technique

[0002] During the clinical infusion process, the infusion connector, as an indispensable key component, plays a crucial role. One end of it is tightly connected to the infusion pipeline, allowing drugs and liquids to pass through smoothly, and the other end is accurately connected to the patient's vascular access, ensuring the stable and safe infusion of therapeutic liquids into the patient's body. It is an important link for the smooth progress of the infusion process.

[0003] Existing devices have deficiencies in preventing liquid backflow, are unable to efficiently control the flow direction of liquid medicine or blood, are difficult to conveniently switch the liquid outlet from different connecting tubes, and lack an effective structure to prevent liquid backflow. In clinical use, they cannot well meet the requirements of efficiently and accurately controlling liquid flow and ensuring the smooth progress of medical operations.

[0004] Therefore, it is necessary to design an anti-backflow positive pressure three-way valve with strong practicability and effective liquid backflow prevention. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-backflow positive pressure three-way valve to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, the present invention provides the following technical solution: An anti-backflow positive pressure three-way valve, including a syringe body, a pressing handle is arranged inside the syringe body, a connecting head is fixedly connected to the bottom of the syringe body, a positive pressure joint connecting mechanism is arranged at the bottom of the connecting head, an anti-backflow valve body mechanism is arranged at the bottom of the positive pressure joint connecting mechanism, and an anti-backflow positive pressure three-way valve mechanism is arranged at the bottom of the anti-backflow valve body mechanism; The anti-backflow positive pressure three-way valve mechanism includes an anti-backflow positive pressure three-way valve connector. The anti-backflow valve body mechanism includes a bottom connector. The anti-backflow positive pressure three-way valve connector is installed at the bottom of the bottom connector. A anti-backflow positive pressure three-way valve body is fixedly connected to the bottom of the anti-backflow positive pressure three-way valve connector. A plug post is fixedly connected inside the anti-backflow positive pressure three-way valve connector. A connecting pipe one is fixedly connected to the left end of the anti-backflow positive pressure three-way valve body. A connecting pipe two is fixedly connected to the right end of the anti-backflow positive pressure three-way valve body. A valve core connecting column is installed inside the anti-backflow positive pressure three-way valve body. A valve body knob is fixedly connected to the outer end of the valve core connecting column. During use, the anti-backflow positive pressure three-way valve mechanism is installed at the bottom of the anti-backflow valve body mechanism for use. It is installed by passing the plug post through the second airtight diaphragm. The flow direction of the liquid medicine or blood can be controlled. By rotating the valve body knob to drive the valve core connecting column to rotate, the flow direction of the liquid flowing in from the anti-backflow positive pressure three-way valve connector can be changed, and the liquid outlet from the connecting pipe one or the connecting pipe two can be controlled. Through the setting of this mechanism, the backflow of liquid can be prevented more efficiently and it can serve the clinic more efficiently.

[0007] According to the above technical solution, the anti-backflow valve body mechanism includes a second airtight diaphragm. The plug post penetrates through the surface of the second airtight diaphragm. The valve core connecting column is driven to rotate by the valve body knob.

[0008] According to the above technical solution, the anti-backflow valve body mechanism includes an anti-backflow valve body. The anti-backflow valve body is arranged at the bottom of the syringe body. A top connector is installed on the top of the anti-backflow valve body. A connecting column is fixedly connected to the top of the top connector. External threads are provided on the surface of the connecting column. A bottom connector is installed at the bottom of the anti-backflow valve body. A second airtight diaphragm is fixedly connected to the bottom inside the bottom connector. During the use of the positive pressure connector connection mechanism, the one-way current limiting is realized through the anti-backflow valve body mechanism. The anti-backflow valve body limits the current of the positive pressure connector to prevent the syringe from backflow during infusion. The anti-backflow valve body mechanism is connected to the positive pressure connector connection mechanism through external threads. The overall structure is stable and will not fall off. When replacement is needed, it can also be quickly removed. Through the setting of this mechanism, it can effectively ensure that neither the syringe nor the positive pressure connector will have backflow.

[0009] According to the above technical solution, both the top connector and the bottom connector are set as detachable structures and are both designed as snap-fit structures.

[0010] According to the above technical solution, the positive pressure joint connection mechanism includes a first connection cylinder body, which is arranged at the bottom end of the syringe body. A first airtight diaphragm is fixedly connected to the top inside the first connection cylinder body. A connection column body is fixedly connected to the top of the first connection cylinder body. A sealing gasket is fixedly connected to the bottom inside the connection column body. A strengthened connection block is fixedly connected to the bottom of the first connection cylinder body. A second connection cylinder body is fixedly connected to the bottom of the strengthened connection block. Internal threads are provided at the bottom inside the second connection cylinder body. During use, the sealing gasket will ensure the sealing performance at the interface of the connector, preventing the positive pressure inside the positive pressure joint connection mechanism from being damaged. When the positive pressure joint connection mechanism is removed from the surface of the connector, the first airtight diaphragm will immediately reset, and the diaphragm will quickly return to its original state by relying on its own elasticity. During this recovery process, the space inside the connector will be squeezed, causing the internal liquid to be pushed forward, thereby forming a positive pressure inside the connector and the catheter, pushing the liquid forward to fill the catheter lumen and preventing blood reflux.

[0011] According to the above technical solution, a connector is fixedly connected to the bottom of the syringe body. The connector is inserted into the inside of the connection column body, and the connector penetrates through the surface of the first airtight diaphragm.

[0012] According to the above technical solution, the positive pressure joint connection mechanism includes a first airtight diaphragm, and the anti-backflow valve body mechanism includes a second airtight diaphragm. Both the first airtight diaphragm and the second airtight diaphragm are made of silicone material.

[0013] According to the above technical solution, the positive pressure joint connection mechanism includes a second connection cylinder body and internal threads, and the anti-backflow valve body mechanism includes a connection column and external threads. The connection column and the second connection cylinder body are threadedly connected through the external threads and the internal threads.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. In the present invention, by providing an anti-backflow positive pressure three-way valve mechanism, during use, the anti-backflow positive pressure three-way valve mechanism is installed at the bottom of the anti-backflow valve body mechanism for use. It is installed by inserting the plug column through the second airtight diaphragm. The flow direction of the liquid medicine or blood can be controlled. By rotating the valve body knob to drive the valve core connecting column to rotate, the flow direction of the liquid flowing in from the anti-backflow positive pressure three-way valve connection seat can be changed, controlling the liquid output from the first connecting pipe or the second connecting pipe. Through the setting of this mechanism, the backflow of the liquid can be prevented more efficiently, and it can serve the clinic more efficiently.

[0015] 2. In the present invention, by providing an anti-backflow valve body mechanism, when the positive pressure connector mechanism is in use, unidirectional current limiting is achieved through the anti-backflow valve body mechanism. The positive pressure of the positive pressure connector is limited by the anti-backflow valve body to prevent the syringe from backflow during infusion. The anti-backflow valve body mechanism is connected to the positive pressure connector mechanism through external threads, and the overall structure is stable without falling off. When replacement is required, it can also be quickly removed. Through the setting of this mechanism, it can effectively ensure that neither the syringe nor the positive pressure connector will have backflow.

[0016] 3. In the present invention, by providing a positive pressure connector mechanism, during use, the sealing gasket will ensure the sealing performance of the interface of the connector head, preventing the positive pressure inside the positive pressure connector mechanism from being damaged. When the positive pressure connector mechanism is removed from the surface of the connector head, the first airtight diaphragm will immediately reset, and the diaphragm will quickly return to its original state relying on its own elasticity. During this recovery process, the internal space of the connector head will be squeezed, causing the internal liquid to be pushed forward, thereby forming a positive pressure inside the connector and the catheter to push the liquid forward to fill the catheter lumen and prevent blood backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is the overall schematic diagram of the present invention; Figure 2 is the schematic diagram of the syringe body of the present invention; Figure 3 is the schematic diagram of the anti-backflow positive pressure three-way valve mechanism of the present invention; Figure 4 is the separated view schematic diagram of the anti-backflow positive pressure three-way valve mechanism of the present invention; Figure 5 is the schematic diagram of the positive pressure connector mechanism of the present invention; Figure 6 is the separated view schematic diagram of the anti-backflow valve body mechanism of the present invention; Figure 7 is the schematic diagram of the anti-backflow valve body mechanism of the present invention.

[0018] In the figure: 1. Syringe body; 2. Pressing handle; 3. Connector; 4. Positive pressure connector connection mechanism; 41. First connecting cylinder; 42. First airtight diaphragm; 43. Connecting cylinder; 44. Sealing gasket; 45. Reinforced connecting block; 46. Second connecting cylinder; 47. Internal thread; 5. Anti-backflow valve body mechanism; 51. Anti-backflow valve body; 52. Top connector; 53. Connecting column; 54. External thread; 55. Bottom connector; 56. Second airtight diaphragm; 6. Anti-backflow positive pressure three-way valve mechanism; 61. Anti-backflow positive pressure three-way valve connection seat; 62. Insertion column; 63. Anti-backflow positive pressure three-way valve body; 64. First connecting pipe; 65. Second connecting pipe; 66. Valve core connecting column; 67. Valve body knob. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] The present invention provides the following technical solutions: Embodiment 1 Please refer to Figures 1-7 , the present invention provides a technical solution: an anti-backflow positive pressure three-way valve, including a syringe body 1, a pressing handle 2 is arranged inside the syringe body 1, a connector 3 is fixedly connected to the bottom of the syringe body 1, a positive pressure connector connection mechanism 4 is arranged at the bottom of the connector 3, an anti-backflow valve body mechanism 5 is arranged at the bottom of the positive pressure connector connection mechanism 4, and an anti-backflow positive pressure three-way valve mechanism 6 is arranged at the bottom end of the anti-backflow valve body mechanism 5; The anti-backflow positive pressure three-way valve mechanism 6 includes an anti-backflow positive pressure three-way valve connecting seat 61. The anti-backflow valve body mechanism 5 includes a bottom connector 55. The anti-backflow positive pressure three-way valve connecting seat 61 is installed at the bottom of the bottom connector 55. A bottom of the anti-backflow positive pressure three-way valve connecting seat 61 is fixedly connected with an anti-backflow positive pressure three-way valve body 63. An inserting column 62 is fixedly connected inside the anti-backflow positive pressure three-way valve connecting seat 61. A left end of the anti-backflow positive pressure three-way valve body 63 is fixedly connected with a connecting pipe 64. A right end of the anti-backflow positive pressure three-way valve body 63 is fixedly connected with a connecting pipe 65. A valve core connecting column 66 is installed inside the anti-backflow positive pressure three-way valve body 63. An outer end of the valve core connecting column 66 is fixedly connected with a valve body knob 67. During use, the anti-backflow positive pressure three-way valve mechanism 6 is installed at the bottom of the anti-backflow valve body mechanism 5 for use. It is installed by passing the inserting column 62 through the second airtight diaphragm 56. The flow direction of the liquid medicine or blood can be controlled. By rotating the valve body knob 67 to drive the valve core connecting column 66 to rotate, the flow direction of the liquid flowing in from the anti-backflow positive pressure three-way valve connecting seat 61 can be changed, and the liquid outlet from the connecting pipe 64 or the connecting pipe 65 can be controlled. Through the setting of this mechanism, the backflow of the liquid can be prevented more efficiently and it can serve the clinic more efficiently; The anti-backflow valve body mechanism 5 includes a second airtight diaphragm 56. The inserting column 62 penetrates through the surface of the second airtight diaphragm 56. The valve core connecting column 66 is driven to rotate by the valve body knob 67.

[0021] Embodiment 2 Please refer to Figures 1-7 , and on the basis of Embodiment 1, further obtain that the anti-backflow valve body mechanism 5 includes an anti-backflow valve body 51. The anti-backflow valve body 51 is arranged at the bottom of the syringe body 1. A top connector 52 is installed at the top of the anti-backflow valve body 51. A connecting column 53 is fixedly connected to the top of the top connector 52. An external thread 54 is provided on the surface of the connecting column 53. A bottom connector 55 is installed at the bottom of the anti-backflow valve body 51. A second airtight diaphragm 56 is fixedly connected to the bottom inside the bottom connector 55. When the positive pressure joint connection mechanism 4 is in use, one-way current limiting is realized through the anti-backflow valve body mechanism 5. The anti-backflow valve body 51 limits the current of the positive pressure joint to prevent the syringe from backflow during infusion. The anti-backflow valve body mechanism 5 is connected to the positive pressure joint connection mechanism 4 through the external thread 54. The overall structure is stable and will not fall off. When replacement is needed, it can also be quickly removed. Through the setting of this mechanism, it can effectively ensure that neither the syringe nor the positive pressure joint will have backflow; Both the top connector 52 and the bottom connector 55 are set as detachable structures and are both designed as snap-fit structures; The positive pressure connector connecting mechanism 4 includes a first connecting cylinder body 41, the first connecting cylinder body 41 is arranged at the bottom end of the syringe body 1, a first airtight diaphragm 42 is fixedly connected to the top inside the first connecting cylinder body 41, a connecting column body 43 is fixedly connected to the top of the first connecting cylinder body 41, a sealing gasket 44 is fixedly connected to the bottom inside the connecting column body 43, a strengthened connecting block 45 is fixedly connected to the bottom of the first connecting cylinder body 41, a second connecting cylinder body 46 is fixedly connected to the bottom of the strengthened connecting block 45, and an internal thread 47 is provided at the bottom inside the second connecting cylinder body 46. During use, the sealing gasket 44 will ensure the sealing performance of the interface of the connector 3, preventing the positive pressure inside the positive pressure connector connecting mechanism 4 from being damaged. When the positive pressure connector connecting mechanism 4 is removed from the surface of the connector 3, the first airtight diaphragm 42 will immediately reset, and the diaphragm will quickly rely on its own elasticity to return to its original state. During this recovery process, the space inside the connector will be squeezed, causing the internal liquid to be pushed forward, thereby forming a positive pressure inside the connector and the catheter, pushing the liquid forward to fill the catheter lumen and preventing blood backflow; The bottom of the syringe body 1 is fixedly connected with a connector 3, the connector 3 is inserted into the inside of the connecting column body 43, and the connector 3 penetrates through the surface of the first airtight diaphragm 42; The positive pressure connector connecting mechanism 4 includes a first airtight diaphragm 42, the anti-backflow valve body mechanism 5 includes a second airtight diaphragm 56, and both the first airtight diaphragm 42 and the second airtight diaphragm 56 are made of silica gel; The positive pressure connector connecting mechanism 4 includes a second connecting cylinder body 46 and an internal thread 47, the anti-backflow valve body mechanism 5 includes a connecting column 53 and an external thread 54, and the connecting column 53 and the second connecting cylinder body 46 are threadedly connected through the external thread 54 and the internal thread 47.

[0022] During the actual operation process, when this device is used, the positive pressure connector connecting mechanism 4, the anti-backflow valve body mechanism 5 and the anti-backflow positive pressure three-way valve mechanism 6 are installed at the bottom of the connector 3. During use, the sealing gasket 44 will ensure the sealing performance of the interface of the connector 3, preventing the positive pressure inside the positive pressure connector connecting mechanism 4 from being damaged. When the positive pressure connector connecting mechanism 4 is removed from the surface of the connector 3, the first airtight diaphragm 42 will immediately reset, and the diaphragm will quickly rely on its own elasticity to return to its original state. During this recovery process, the space inside the connector will be squeezed, causing the internal liquid to be pushed forward, thereby forming a positive pressure inside the connector and the catheter, pushing the liquid forward to fill the catheter lumen and preventing blood backflow; When the positive pressure connector connecting mechanism 4 is in use, one-way current limiting is achieved through the anti-backflow valve body mechanism 5. The positive pressure connector is current-limited by the anti-backflow valve body 51 to prevent the syringe from backflow during infusion. The anti-backflow valve body mechanism 5 is connected to the positive pressure connector connecting mechanism 4 through the external thread 54, and the overall structure is stable without falling. When replacement is needed, it can also be quickly removed. Through the setting of this mechanism, it can effectively ensure that neither the syringe nor the positive pressure connector has backflow; During use, the anti-backflow positive pressure three-way valve mechanism 6 is installed at the bottom of the anti-backflow valve body mechanism 5 for use. It is installed by inserting the plug post 62 through the second airtight diaphragm 56. The flow direction of the liquid medicine or blood can be controlled. By rotating the valve body knob 67 to drive the valve core connecting column 66 to rotate, the flow direction of the liquid flowing in from the anti-backflow positive pressure three-way valve connecting seat 61 can be changed, and the liquid outlet from the connecting pipe 1 64 or the connecting pipe 2 65 can be controlled. Through the setting of this mechanism, the backflow of liquid can be prevented more efficiently and it can serve the clinic more efficiently.

[0023] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0024] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A backflow prevention positive pressure three-way valve, comprising a syringe body (1), characterized in that: A pressing handle (2) is arranged inside the syringe body (1); a connector (3) is fixedly connected to the bottom of the syringe body (1); a positive pressure joint connection mechanism (4) is arranged at the bottom of the connector (3); a backflow prevention valve body mechanism (5) is arranged at the bottom of the positive pressure joint connection mechanism (4); and a backflow prevention positive pressure three-way valve mechanism (6) is arranged at the bottom of the backflow prevention valve body mechanism (5); The anti-backflow positive pressure three-way valve mechanism (6) comprises an anti-backflow positive pressure three-way valve connecting seat (61), and the anti-backflow valve body mechanism (5) comprises a bottom connector (55). The anti-backflow positive pressure three-way valve connecting seat (61) is mounted on the bottom of the bottom connector (55). The bottom of the anti-backflow positive pressure three-way valve connecting seat (61) is fixedly connected to an anti-backflow positive pressure three-way valve body (63). The interior of the anti-backflow positive pressure three-way valve connecting seat (61) is fixedly connected to a plug-in column (62). The left end of the anti-backflow positive pressure three-way valve body (63) is fixedly connected to a connecting pipe 1 (64), and the right end of the anti-backflow positive pressure three-way valve body (63) is fixedly connected to a connecting pipe 2 (65). A valve core connecting column (66) is mounted inside the anti-backflow positive pressure three-way valve body (63), and the outer end of the valve core connecting column (66) is fixedly connected to a valve body knob (67).

2. The anti-backflow positive pressure three-way valve according to claim 1, characterized in that: The anti-backflow valve body mechanism (5) comprises a second sealed diaphragm (56), the plug-in column (62) penetrates the surface of the second sealed diaphragm (56), and the valve core connecting column (66) is driven to rotate by a valve body knob (67).

3. The anti-backflow positive pressure three-way valve according to claim 1, characterized in that: The anti-backflow valve body mechanism (5) comprises an anti-backflow valve body (51), the anti-backflow valve body (51) is arranged at the bottom of the syringe body (1), a top connector (52) is installed on the top of the anti-backflow valve body (51), a connecting column (53) is fixedly connected to the top of the top connector (52), and an external thread (54) is provided on the surface of the connecting column (53), a bottom connector (55) is installed on the bottom of the anti-backflow valve body (51), and a second sealed diaphragm (56) is fixedly connected to the bottom of the bottom connector (55).

4. The anti-backflow positive pressure three-way valve according to claim 3, characterized in that: The top connector (52) and the bottom connector (55) are both configured as detachable structures, and are both designed as snap-on structures.

5. The anti-backflow positive pressure three-way valve according to claim 1, characterized in that: The positive pressure joint connection mechanism (4) comprises a first connection cylinder (41), the first connection cylinder (41) is arranged at the bottom end of the syringe body (1), a first sealed diaphragm (42) is fixedly connected to the top of the first connection cylinder (41), a connection column (43) is fixedly connected to the top of the first connection cylinder (41), a sealing gasket (44) is fixedly connected to the bottom of the connection column (43), a reinforcing connection block (45) is fixedly connected to the bottom of the first connection cylinder (41), a second connection cylinder (46) is fixedly connected to the bottom of the reinforcing connection block (45), and an internal thread (47) is provided at the bottom of the second connection cylinder (46).

6. The anti-backflow positive pressure three-way valve according to claim 5, characterized in that: A connector (3) is fixedly connected to the bottom of the syringe body (1); the connector (3) is inserted into the interior of the connecting column (43); and the connector (3) penetrates the surface of the first sealed diaphragm (42).

7. The anti-backflow positive pressure three-way valve according to claim 1, characterized in that: The positive pressure joint connection mechanism (4) comprises a first sealed diaphragm (42), and the anti-backflow valve body mechanism (5) comprises a second sealed diaphragm (56), and both the first sealed diaphragm (42) and the second sealed diaphragm (56) are made of silicone.

8. The anti-backflow positive pressure three-way valve according to claim 1, characterized in that: The positive pressure joint connection mechanism (4) comprises a second connection cylinder (46) and an internal thread (47), and the anti-backflow valve body mechanism (5) comprises a connection column (53) and an external thread (54), and the connection column (53) and the second connection cylinder (46) are threadedly connected via the external thread (54) and the internal thread (47).

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