A rotary joint and infusion device

Abstract

This utility model discloses a rotary joint, including a connecting end, a rotating end, and a sealing assembly. The connecting end has a first channel, one end of which is a liquid inlet and the other end is a liquid outlet. The connecting end also has at least one injection port communicating with the first channel. A first one-way valve is connected to the injection port, and a second one-way valve is connected to the injection port. The rotating end has a second channel. The end of the connecting end near the injection port is inserted into and rotatably connected to the rotating end. The first channel and the second channel communicate. A first sealing ring is provided between the connecting end and the rotating end. This effectively avoids the problem of pipe tangling caused by the rotation of the connecting end, ensuring smooth liquid flow in the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a rotary joint and an infusion device. Background Technology

[0002] In clinical infusion tubing, different functional units such as infusion bags, syringe pumps, or filters need to be connected. To prevent backflow of fluid between different tubing lines, check valves are usually installed at the connection points. In current technology, the check valve and tubing are integrated into a single connector, which is plugged into to allow the tubing to flow. Furthermore, to meet more functional requirements, multiple check valves with different pathways may be installed on the connector.

[0003] However, when connecting the two tubing ends, medical staff often use a rotating motion for easier insertion. Therefore, when rotating the one-piece connector during insertion, the torque is transmitted to the adjacent tubing, easily causing it to coil and hindering fluid flow. Furthermore, during infusion, movement of the infusion head or tail can also cause the connector and tubing to move together, resulting in further coiling. Utility Model Content

[0004] The purpose of this invention is to provide a rotary joint and infusion device to solve the problem of pipeline entanglement when connecting adjacent pipelines.

[0005] To achieve this objective, the present invention adopts the following technical solution: A rotary joint, comprising: The connecting end has a first channel, one end of which is a liquid inlet and the other end is a liquid outlet. The connecting end is also equipped with at least one injection port that communicates with the first channel. A first check valve is connected to the liquid outlet and a second check valve is connected to the injection port. The rotating end has a second channel. The end of the connecting end near the infusion port is inserted into and rotatably connected to the rotating end. The first channel is connected to the second channel. A first sealing ring is provided between the connecting end and the rotating end.

[0006] Optionally, one end of the connecting end is a connector and the other end is a plug. One end of the rotating end is formed with a slot, and the plug is inserted into the slot. The first sealing ring is located between the end face of the plug and the bottom of the slot. The slot has an inwardly extending groove, and the end face of the connector is provided with an extension section, which is inserted into the extension groove. The thickness of the extension section gradually decreases in the direction away from the connector.

[0007] Optionally, the first check valve has a third channel communicating with the first channel, and the second check valve has a fourth channel communicating with the first channel. The first check valve is used to allow liquid to flow only from the first channel to the third channel, and the second check valve is used to allow liquid to flow only from the fourth channel to the first channel.

[0008] Optionally, the first check valve includes: A valve body is connected to the connecting end, and a liquid-passing cavity is formed between the end of the valve body and the end face of the connecting end. An abutment block is disposed in the first through hole and fixedly connected to the connecting end; An elastic valve core is disposed between the abutment block and the valve body. A water passage hole is opened in the center of the elastic valve core. When the elastic valve core is not deformed, it fits against the abutment block to block the first through hole.

[0009] Optionally, the rotary joint further includes a sealing assembly that allows a gap to be created between the connected end and the rotary end within a set distance after insertion, and maintains a seal when the rotary end rotates. The sealing assembly includes: A first insert sleeve is movably connected to one end of the connector and located in the first channel. A first limiting protrusion is provided on the outer wall of the first insert sleeve, and a fixing ring is provided on the outer wall of the first insert sleeve. A sliding groove is provided on the inner wall of the connector, and the fixing ring is slidably disposed in the sliding groove. The width of the sliding groove is greater than the width of the fixing ring. The second insertion sleeve is fixedly connected to one end of the rotating end and located in the second channel. A second limiting protrusion is provided on the inner wall of the second insertion sleeve, and a second sealing ring is provided between the end face of the second insertion sleeve and the first insertion sleeve. After the connector is inserted into the slot, the second connector sleeve is inserted outside the first connector sleeve, and the second connector sleeve is partially in the first channel. The first limiting protrusion is located on the side of the second limiting protrusion close to the rotating end, and there is a gap between the two.

[0010] Optionally, a gap exists between the side wall of the first insertion sleeve near the end face of the connecting end and the inner wall of the connecting end, forming an insertion groove, and the second insertion sleeve is inserted into the insertion groove.

[0011] Optionally, the rotary joint further includes a throttling assembly, which includes a throttling male connector fixedly connected to the first insertion sleeve and a throttling female connector fixedly connected to the second insertion sleeve; The male throttling connector is provided with multiple liquid inlet holes spaced apart, and the female throttling connector is provided with multiple liquid outlet holes spaced apart. After the connector is inserted into the slot, the male throttling connector and the female throttling connector cooperate, and the liquid inlet holes and the liquid outlet holes correspond one-to-one and are connected.

[0012] Optionally, the outlet holes on the throttling female head are spaced apart along the axial direction, and the distance between two adjacent outlet holes is greater than the set distance that allows the gap between the connecting end and the plug end.

[0013] Optionally, the end of the throttling female connector away from the throttling male connector is provided with an overflow hole.

[0014] This utility model also provides an infusion device, including the rotary joint as described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This utility model provides a rotary joint for use as a connecting end of an infusion pipeline to connect two pipelines. A first one-way valve and a second one-way valve ensure that liquid flows only towards the infusion port, preventing cross-contamination and backflow. The rotary end is rotatably connected to the connecting end, and the rotary end can rotate relative to the connecting end. When the connecting pipeline or infusion pipeline moves, the relative rotation between the connecting end and the rotary end does not cause the pipeline to rotate, effectively preventing pipeline tangling caused by the rotation of the connecting end and ensuring smooth liquid flow in the pipeline. Simultaneously, the first sealing ring improves the sealing effect between the connecting end and the rotary end, effectively preventing liquid leakage.

[0016] In addition, when the rotating end rotates, the connected end and the rotating end can be separated by a certain gap to reduce the friction of the first sealing ring before rotating the rotating end. Even after the connected end and the rotating end are separated by a gap, they can still maintain a good sealing effect. Thus, while facilitating the rotation of the rotating end, the sealing between the connected end and the rotating end can also be maintained. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0019] Figure 1 This is a schematic diagram of a rotary joint.

[0020] Figure 2 This is a cross-sectional view of a rotary joint.

[0021] Figure 3 for Figure 2 Enlarged view of the structure of part A in the middle.

[0022] Figure 4 This is an exploded view of the structure of a rotary joint.

[0023] Diagram Explanation: 1. Connecting end; 11. First channel; 12. Inlet; 13. Infusion port; 14. Injection port; 15. First check valve; 151. Third channel; 152. Valve body; 153. Abutment block; 154. Resilient valve core; 16. Second check valve; 161. Fourth channel; 17. Connecting head; 18. Insert connector; 181. Extension section; 2. Rotating end; 21. Second channel; 22. Insert... 23. Extension groove; 3. First sealing ring; 4. Sealing assembly; 41. First insertion sleeve; 411. First limiting protrusion; 412. Fixing ring; 413. Sliding groove; 42. Second insertion sleeve; 421. Second limiting protrusion; 43. Second sealing ring; 44. Insertion groove; 5. Throttling assembly; 51. Throttling male head; 511. Liquid inlet; 52. Throttling female head; 521. Liquid outlet; 522. Overflow hole. Detailed Implementation

[0024] To make the invention's objectives, features, and advantages more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0026] This utility model provides a rotary joint, including a connecting end, a rotating end, and a sealing assembly. The connecting end has a first channel, one end of which is a liquid inlet and the other end is a liquid outlet. The connecting end is also provided with at least one injection port communicating with the first channel. A first check valve is connected to the injection port, and a second check valve is connected to the injection port. The rotating end has a second channel. The end of the connecting end near the injection port is inserted into and rotatably connected to the rotating end. The first channel and the second channel are communicating. A first sealing ring is provided between the connecting end and the rotating end.

[0027] This utility model provides a rotary joint for use as a connecting end of an infusion pipeline to connect two pipelines. A first one-way valve and a second one-way valve ensure that liquid flows only towards the infusion port, preventing cross-contamination and backflow. The rotary end is rotatably connected to the connecting end, and the rotary end can rotate relative to the connecting end. When the connecting pipeline or infusion pipeline moves, the relative rotation between the connecting end and the rotary end does not cause the pipeline to rotate, effectively preventing pipeline tangling caused by the rotation of the connecting end and ensuring smooth liquid flow in the pipeline. Simultaneously, the first sealing ring improves the sealing effect between the connecting end and the rotary end, effectively preventing liquid leakage.

[0028] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1-4 As shown, this embodiment of the invention provides a rotary connector for use as a connection end 1 of an infusion tubing, enabling the connection of two tubing lines. The infusion tubing typically includes an inlet tube, an infusion tube, and an injection tube. The inlet tube connects to a medication bottle, the infusion tube connects to the patient or the target of the infusion, and the injection tube connects to the junction of the inlet and infusion tubes. In some infusion scenarios, the injection tube may only be a short section. When the rotary connector of this embodiment is connected to the infusion tubing, the adjacent tubing is connected by rotation, preventing the tubing from becoming tangled.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the rotary joint includes a connecting end 1, a rotating end 2, and a sealing assembly 4. The connecting end 1 has a first channel 11, one end of which is an inlet 12 and the other end is an outlet 13. The connecting end 1 is also provided with at least one injection port 14 communicating with the first channel 11. A first check valve 15 is connected to the inlet 12, and a second check valve 16 is connected to the injection port 14. The rotating end 2 has a second channel 21. The end of the connecting end 1 near the outlet 13 is inserted into and rotatably connected to the rotating end 2. The first channel 11 and the second channel 21 are in communication. A first sealing ring 3 is provided between the connecting end 1 and the rotating end 2.

[0031] Specifically, the connecting end 1 can be a tee or a four-way pipe, and the specific structure can be selected according to the application scenario of the infusion tubing. For example, the connecting end 1 is an integrated tee structure with three openings: an inlet 12, an infusion port 13, and an injection port 14. The inlet pipe is connected to the inlet 12, the infusion pipe is connected to the infusion port 13, and the injection pipe is connected to the injection port 14. The infusion port 13 is connected to a first one-way valve 15, which is used to connect the infusion tubing; the injection port 14 is connected to a second one-way valve 16, which is used to connect the injection tubing.

[0032] During infusion, the fluid enters the first channel 11 through the inlet 12 or the injection port 14 and flows out through the infusion port 13. The first one-way valve 15 connected to the infusion port 13 ensures that the fluid can only flow from the first channel 11 to the infusion port 13, preventing backflow of the medication in the infusion tubing and causing accidental mixing of the fluids; the second one-way valve 16 connected to the injection port 14 ensures that the fluid can only flow into the first channel 11 from the second channel, achieving physical isolation between the main infusion pathway and the injection medication pathway, avoiding accidental mixing of the medications due to backflow and causing contamination.

[0033] Rotary end 2 is rotatably connected to connecting end 1, and the inlet tube is connected to rotary end 2. For example, when connecting the inlet tube and the infusion tube, the infusion line can be connected to connecting end 1 first, then the rotary end 2 can be inserted into connecting end 1, and finally the inlet tube can be connected to rotary end 2. The connection between the infusion line and connecting end 1, and between the inlet tube and rotary end 2, can be made by rotation, facilitating a tight connection. Furthermore, the connection can be achieved by rotating connecting end 1 and rotary end 2 without causing the inlet tube and infusion tube to rotate, thus avoiding the problem of tubing tangling caused by the rotation of connecting end 1 or rotary end 2, and ensuring smooth flow of liquid in the tubing.

[0034] Meanwhile, the addition of a rotating end 2 between the connecting end 1 and the infusion tube, and the fact that the rotating end 2 needs to rotate relative to the connecting end 1, may pose a risk of liquid leakage; while the first sealing ring 3 can improve the sealing effect between the connecting end 1 and the rotating end 2, effectively preventing liquid leakage.

[0035] In this embodiment of the utility model, one end of the connecting end 1 is a connector 17, and the other end is a plug 18. One end of the rotating end 2 is formed with a slot 22. The plug 18 is inserted into the slot 22. The first sealing ring 3 is located between the end face of the plug 18 and the bottom of the slot 22. The slot 22 has an inwardly extending extension groove 23. An extension section 181 is provided on the end face of the plug 18. The extension section 181 is inserted into the extension groove 23. The thickness of the extension section 181 gradually decreases towards the plug 18.

[0036] Specifically, the end of the connecting end 1 near the inlet 12 is a plug 18, and the end near the infusion port 13 is a connector 17. A slot 22 is provided at one end of the rotating end 2. The slot 22 can be stepped. A limiting protrusion ring can be provided on the side wall of the first step of the slot 22. There is a gap between the limiting protrusion ring and the bottom of the first step of the slot 22. The plug 18 can be engaged with the protrusion ring. After the plug 18 is inserted into the slot 22, the engaging protrusion ring enters between the limiting protrusion ring and the bottom of the first step of the slot 22, facilitating the fixing and rotation of the rotating end 2. An extension groove 23 is formed inward on the bottom of the second step of the slot 22, and an extension section 181 is provided on the end face of the plug 18, which is inserted into the extension groove 23. The first sealing ring 3 is located between the end face of the plug 18 and the bottom of the second step of the slot 22. When the rotating end 2 is separated from the plug end by one end gap, the friction between the first sealing ring 3 and the rotating end 2 can be further reduced, making it easier for the rotating end 2 to rotate.

[0037] like Figure 2 , Figure 3 As shown in the present invention, the rotary joint further includes a sealing component 4. The sealing component 4 is disposed at the connection between the connecting end 1 and the rotating end 2. The sealing component 4 allows the connecting end 1 and the rotating end 2 to have a gap within a set distance after insertion, and remains sealed when the rotating end 2 rotates.

[0038] Specifically, to ensure a tight seal between the connecting end 1 and the rotating end 2, the first sealing ring 3 needs to be tightly fitted to both the connecting end 1 and the rotating end 2. Consequently, when the rotating end 2 rotates, it may be difficult to rotate due to significant friction with the first sealing ring 3. Therefore, by providing the sealing component 4, a certain gap can be created between the connected end 1 and the rotating end 2 after insertion when the rotating end 2 rotates. This reduces the friction between the rotating end 2 and the first sealing ring 3, allowing the rotating end 2 to rotate further. Even with this gap, a good seal can still be maintained between the connecting end 1 and the rotating end 2. Thus, while facilitating the rotation of the rotating end 2, the sealing between the connecting end 1 and the rotating end 2 can be maintained.

[0039] Furthermore, the sealing assembly 4 includes: The first insertion sleeve 41 is movably connected to one end of the connecting end 1 and located in the first channel 11. A first limiting protrusion 411 is provided on the outer wall of the first insertion sleeve 41, and a fixing ring 412 is provided on the outer wall of the first insertion sleeve 41. A sliding groove 413 is provided on the inner wall of the connector 17, and the fixing ring 412 is slidably disposed in the sliding groove 413. The width of the sliding groove 413 is greater than the width of the fixing ring 412. The second insertion sleeve 42 is fixedly connected to one end of the rotating end 2 and located in the second channel 21. A second limiting protrusion 421 is provided on the inner wall of the second insertion sleeve 42. A second sealing ring 43 is provided between the end face of the second insertion sleeve 42 and the first insertion sleeve 41. After the connector 18 is inserted into the slot 22, the second connector sleeve 42 is inserted outside the first connector sleeve 41, and part of the second connector sleeve 42 is in the first channel 11. The first limiting protrusion 411 is located on the side of the second limiting protrusion 421 near the rotating end 2, and there is a gap between the two.

[0040] Specifically, the first insertion sleeve 41 is disposed in the first channel 11 of the connection end 1 and is located on one side of the insertion connector 18. The part of the first insertion sleeve 41 facing away from the insertion connector 18 is located outside the first channel 11. The outer wall diameter of the side of the first insertion sleeve 41 facing away from the insertion connector 18 is smaller than the outer wall diameter of the other side. The larger diameter part fits against the inner wall of the connection end 1, while the smaller diameter part overlaps with the inner wall of the connection end 1 and forms an insertion groove 44. In this device, a fixing ring 412 is fixed on the outer wall of the larger diameter portion of the first insertion sleeve 41. The cross-section of the fixing ring 412 can be T-shaped. A sliding groove 413 is provided on the inner wall of the connecting end 1. The fixing ring 412 is located in the sliding groove 413, and the width of the sliding groove 413 is greater than the width of the fixing ring 412. The width of the sliding groove 413 is the distance range at which the rotating end 2 and the connecting end 1 can be separated. Thus, the first insertion sleeve 41 can slide axially relative to the connecting end 1 within the width range of the sliding groove 413, and the first insertion sleeve 41 can rotate relative to the connecting end 1.

[0041] The second insertion sleeve 42 is fixed in the second channel 21 of the rotating end 2, and the portion of the second insertion sleeve 42 facing away from the rotating end 2 is located outside the second channel 21; the second insertion sleeve 42 is inserted into the insertion groove 44. A second sealing ring 43 is provided between the end face of the second insertion sleeve 42 and the bottom of the insertion groove 44.

[0042] Meanwhile, a first limiting protrusion 411 is provided on the outer wall of the smaller diameter portion of the first insert sleeve 41, and a second limiting protrusion 421 is provided on the inner wall of the second insert sleeve 42. When the first insert sleeve 41 is inserted into the second insert sleeve 42, the first limiting protrusion 411 is located on the side of the second limiting protrusion 421 closer to the rotating end 2. Through the first limiting protrusion 411 and the second limiting protrusion 421, the first insert sleeve 41 and the second insert sleeve 42 are interference-fitted, thereby allowing the first insert sleeve 41 and the rotating end 2 to be relatively fixed. When the rotating end 2 rotates, it can drive the first insert sleeve 41 to rotate together. Furthermore, the distance between the first limiting protrusion 411 and the second limiting protrusion 421 is equal to the distance range within which the rotating end 2 and the connecting end 1 can be separated. Therefore, when it is necessary to rotate the rotating end 2, the rotating end 2 is separated from the connecting end 1 by a certain distance to reduce the friction between the first sealing ring 3 and the rotating end 2. The rotating end 2 will drive the first insertion sleeve 41 to move axially together. Thus, the axial position of the first insertion sleeve 41 between the second insertion sleeve 42 remains unchanged, that is, the sealing effect of the second sealing ring 43 remains unchanged. Therefore, while facilitating the rotation of the rotating end 2, a good sealing effect between the connecting end 1 and the rotating end 2 can still be maintained, and the risk of severe wear of the first sealing ring 3 after multiple rotations can also be effectively reduced.

[0043] like Figure 2, Figure 3 As shown, in this embodiment of the invention, the rotary joint further includes a throttling component 5. The throttling component 5 includes a throttling male head 51 fixedly connected to the first insertion sleeve 41 and a throttling female head 52 fixedly connected to the second insertion sleeve 42. The throttling male head 51 is provided with a plurality of liquid inlet holes 511 spaced apart, and the throttling female head 52 is provided with a plurality of liquid outlet holes 521 spaced apart. After the plug 18 is inserted into the slot 22, the throttling male head 51 and the throttling female head 52 cooperate, and the liquid inlet holes 511 and the liquid outlet holes 521 correspond one-to-one and are connected.

[0044] Furthermore, the outlet holes 521 on the throttling female head 52 are spaced apart along the axial direction, and the distance between two adjacent outlet holes 521 is greater than the set distance that allows the gap between the connecting end 1 and the plug end.

[0045] Specifically, after the first insertion sleeve 41 and the second insertion sleeve 42 are inserted, the throttling male head 51 and the throttling female head 52 are also inserted and fitted together, with multiple inlet holes 511 and multiple outlet holes 521 corresponding one-to-one. The liquid in the second channel 21 enters the throttling male head 51 sequentially from the outlet hole 521 and the inlet hole 511. When the connecting end 1 and the rotating end 2 are separated by a gap, the inlet hole 511 and the outlet hole 521 are misaligned, and the diameter of the outlet hole 521 is reduced, thereby reducing the amount of liquid flowing from the second channel 21 into the first channel 11. This reduces the amount of liquid flowing into the first channel 11 during the rotation of the rotating end 2, which helps to further reduce the risk of liquid leakage. At the same time, when the rotating end 2 rotates, the inlet hole 511 and the outlet hole 521 are also misaligned around the axis, which allows for control of the liquid flow rate in the first channel 11 when the rotating end 2 is rotated.

[0046] For example, an overflow hole 522 is provided on the end face of the throttling female head 52 away from the throttling male head 51. When the throttling male head 51 is reinserted into the throttling female head 52, the liquid that enters between the inside of the throttling female head 52 and the end of the throttling male head 51 can be discharged from the overflow hole 522, so that the throttling male head 51 and the throttling female head 52 can fit tightly together.

[0047] For example, the first one-way valve 15 has a third channel 151 communicating with the first channel 11, and the second one-way valve 16 has a fourth channel 161 communicating with the first channel 11. The first one-way valve 15 is used to ensure that liquid can only flow from the first channel 11 to the third channel 151, and the second one-way valve 16 is used to ensure that liquid can only flow from the fourth channel 161 to the first channel 11. Specifically, the first one-way valve 15 connected to the infusion port 13 allows liquid to flow unidirectionally from the first channel 11 to the third channel 151, preventing backflow of the medication and accidental mixing of the liquid; the second one-way valve 16 connected to the injection port 14 allows liquid to flow unidirectionally from the fourth channel 161 to the first channel 11, realizing physical isolation between the main infusion path and the injection drug delivery path, and avoiding backflow of the medication and accidental mixing, which could cause contamination.

[0048] This utility model embodiment also provides an infusion device, which includes a rotary joint. The specific structure of the rotary joint is as described in the above embodiments. Since this infusion device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0049] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rotary joint, characterized in that, include: A connecting end (1) has a first channel (11), one end of the first channel (11) is an inlet (12) and the other end is an outlet (13). The connecting end (1) is also equipped with at least one injection port (14) communicating with the first channel (11). A first check valve (15) is connected to the outlet (13) and a second check valve (16) is connected to the injection port (14). A rotating end (2) has a second channel (21). The end of the connecting end (1) near the infusion port (13) is inserted into and rotatably connected to the rotating end (2). The first channel (11) communicates with the second channel (21). A first sealing ring (3) is provided between the connecting end (1) and the rotating end (2).

2. The rotary joint according to claim 1, characterized in that, One end of the connecting end (1) is a connector (17), and the other end is a plug (18). One end of the rotating end (2) is formed with a slot (22). The plug (18) is inserted into the slot (22). The first sealing ring (3) is located between the end face of the plug (18) and the bottom of the slot (22). The slot (22) has an inwardly extending extension groove (23), and the end face of the connector (18) is provided with an extension section (181), which is inserted into the extension groove (23). The thickness of the extension section (181) gradually decreases in the direction away from the connector (18).

3. The rotary joint according to claim 1, characterized in that, The first check valve (15) has a third channel (151) communicating with the first channel (11), and the second check valve (16) has a fourth channel (161) communicating with the first channel (11). The first check valve (15) is used to allow liquid to flow only from the first channel (11) to the third channel (151), and the second check valve (16) is used to allow liquid to flow only from the fourth channel (161) to the first channel (11).

4. The rotary joint according to claim 3, characterized in that, The first check valve (15) includes: A valve body (152) is connected to the connecting end (1), and a liquid-filled cavity is formed between the end of the valve body (152) and the end face of the connecting end (1); An abutment block (153) is disposed in the first through hole (11) and fixedly connected to the connecting end (1); An elastic valve core (154) is disposed between the abutment block (153) and the valve body (152). A water passage hole is opened in the center of the elastic valve core (154). When the elastic valve core (154) is not deformed, it fits against the abutment block (153) to block the first through hole (11).

5. The rotary joint according to claim 1, characterized in that, It also includes a sealing assembly (4), which allows a gap to be formed between the connected end (1) and the rotating end (2) within a set distance after insertion, and maintains a seal when the rotating end (2) rotates. The sealing assembly (4) includes: A first insert sleeve (41) is movably connected to one end of the connecting end (1) and located in the first channel (11). A first limiting protrusion (411) is provided on the outer wall of the first insert sleeve (41). A fixing ring (412) is provided on the outer wall of the first insert sleeve (41). A sliding groove (413) is provided on the inner wall of the connecting head (17). The fixing ring (412) is slidably disposed in the sliding groove (413). The width of the sliding groove (413) is greater than the width of the fixing ring (412). The second insertion sleeve (42) is fixedly connected to one end of the rotating end (2) and located in the second channel (21). A second limiting protrusion (421) is provided on the inner wall of the second insertion sleeve (42). A second sealing ring (43) is provided between the end face of the second insertion sleeve (42) and the first insertion sleeve (41). After the connector (18) is inserted into the slot (22), the second connector sleeve (42) is inserted outside the first connector sleeve (41), and the second connector sleeve (42) is partially in the first channel (11). The first limiting protrusion (411) is located on the side of the second limiting protrusion (421) close to the rotating end (2), and there is a gap between the two.

6. The rotary joint according to claim 5, characterized in that, The first insertion sleeve (41) has a gap between its side wall near the end face of the connecting end (1) and the inner wall of the connecting end (1), forming an insertion groove (44), and the second insertion sleeve (42) is inserted into the insertion groove (44).

7. The rotary joint according to claim 5, characterized in that, The rotary joint also includes a throttling assembly (5), which includes a throttling male head (51) fixedly connected to the first insertion sleeve (41) and a throttling female head (52) fixedly connected to the second insertion sleeve (42). The male throttling head (51) is provided with a plurality of liquid inlet holes (511) spaced apart, and the female throttling head (52) is provided with a plurality of liquid outlet holes (521) spaced apart. After the connector (18) is inserted into the slot (22), the male throttling head (51) and the female throttling head (52) cooperate, and the liquid inlet holes (511) and the liquid outlet holes (521) correspond one-to-one and are connected.

8. The rotary joint according to claim 7, characterized in that, The outlet holes (521) on the throttling female head (52) are spaced apart along the axial direction, and the distance between two adjacent outlet holes (521) is greater than the set distance between the connecting end (1) and the plug end that allows for a gap.

9. The rotary joint according to claim 7, characterized in that, The throttling female connector (52) has an overflow hole (522) at the end away from the throttling male connector (51).

10. An infusion device, characterized in that, Includes the rotary joint as described in any one of claims 1-9.

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