Fetal head extractor with anti-reflux

Abstract

The application belongs to the technical field of medical apparatus and instruments, and discloses a fetal head aspirator with anti-reflux function. The fetal head aspirator comprises a handle column, one side of the handle column is fixed with a catheter, one end of the catheter is fixed with a suction cup, the other side of the handle column is provided with a handle plate, the inside of the handle plate is provided with a pushing device, the bottom of the handle column is provided with a shunt cavity, the inside of the shunt cavity is provided with a shunt device, and the inside of the handle column is provided with a guide device. The rubber convex ring inside of the suction cup is matched with the head of the fetus, then the pushing device pushes the air pressure into the guide device, the guide device is driven by the air pressure to generate negative pressure adsorption force in the shunt device, the negative pressure adsorption force is transmitted to the catheter through the shunt device, and finally the negative pressure adsorption force is transmitted to the inner cavity of the suction cup through the catheter, so that the suction cup generates adsorption force to adsorb the head of the fetus.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a fetal head suction device with anti-backflow function. Background Technology

[0002] During childbirth, if a woman experiences uterine atony, persistent transverse or posterior occiput position, natural childbirth can be very difficult. In such cases, a fetal head retraction device is needed to reposition the fetal head.

[0003] Currently, during childbirth, after the amniotic sac ruptures and the fetal head is still inside the uterus, when using a vacuum extractor to pull the fetal head, a soft suction cup needs to be placed inside the uterus to suction and pull the fetal head. However, during the suction process, amniotic fluid, blood, and secretions may enter the negative pressure tube, disrupting the stability of the negative pressure and causing unstable suction, which poses a safety risk. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a tire head suction device with anti-backflow function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a tire head suction device with anti-backflow function, comprising a handle post, a guide tube fixed on one side of the handle post, a suction cup fixed at one end of the guide tube, a handle plate provided on the other side of the handle post, a pushing device provided inside the handle plate, a flow diversion cavity opened at the bottom of the handle post, a flow diversion device provided inside the flow diversion cavity, and a guiding device provided inside the handle post.

[0006] Preferably, a rubber protruding ring is fixed at the top edge of the suction cup, and a wire mesh pad is provided between the inner walls of the rubber protruding ring at the top of the suction cup. An inner cavity is formed in the middle of the suction cup, and the top of the inner cavity extends to the top of the suction cup. One end of the conduit is connected to the inner cavity. Multiple side suction channels are equally spaced along the circumferential direction near the edge of the inner bottom surface of the suction cup, and one end of each of the multiple side suction channels extends into the inner cavity. An annular cavity is formed on the inner side of the rubber protruding ring, and a rubber membrane is provided between the inner walls of the annular cavity.

[0007] Preferably, the diversion device includes a fixed column fixed inside the diversion cavity. The interior of the fixed column is hollow near the bottom and top. A bent flow channel is formed near one side edge of the interior of the handle column. One end of the bent flow channel is connected to the end of the guide tube, and the other end of the bent flow channel is connected to the bottom of the fixed column. Multiple grid openings are equidistantly formed at the top of the fixed column along the circumferential direction. All of the multiple grid openings penetrate into the interior of the fixed column. Inner sliding cavities are formed near both sides of the interior of the fixed column. The bottom of two inner sliding cavities extends to the bottom of the fixed column, and the upper end face of the fixed column is located below the grid openings.

[0008] Preferably, both outer surfaces of the fixing column have through openings at the middle, extending into the interior of the fixing column. Both outer surfaces of the fixing column have sliding grooves extending into the interior of the inner sliding cavity. The through openings and the inner sliding cavities are interconnected. Both sliding grooves are located directly above the through openings. Both inner sliding cavities have inner sealing plates slidably installed inside. One outer surface of each inner sealing plate corresponds to one inner surface of the inner sliding cavity and is slidably and sealingly fitted.

[0009] Preferably, each of the two inner sealing plates has a connecting port on one side near the top, and the two connecting ports are aligned with the through port. A sliding sleeve is slidably provided on the outer surface of the fixing column. A slider is fixed on the inner wall of both sides of the sliding sleeve near the bottom. The two sliders are correspondingly slidably engaged in the sliding groove. One end of each slider is correspondingly fixed to the outer surface of the inner sealing plate near the top edge.

[0010] Preferably, the bottom of the sliding sleeve is fixed with two connecting rods, the bottom of the handle post is fixed with an end cap, the bottom ends of the two connecting rods slide through the end cap and extend below it, a connecting plate is fixed between the bottoms of the two connecting rods, the bottom of the end cap is fixedly connected to a bottom tube, an annular float is provided inside the flow diversion cavity near the bottom, the annular float is fixed between the two connecting rods, a gap is left between the inner side of the annular float and the outer surface of the fixed post, both connecting rods have a bend opening inside, the top and bottom ends of the two bend openings extend to the outer surface of the connecting rod, the top of the two bend openings are located at the sliding contact point between the connecting rod and the handle post, the bottom of one bend opening is located inside the end cap, and the bottom of the other bend opening is located below the end cap.

[0011] Preferably, the pushing device includes an air chamber inside the handle plate and a slidingly sealed inner slide plate. The inner slide plate is slidably sealed between the inner walls of the air chamber. Guide rods are fixed on one side of the outer surface of the inner slide plate near both ends. The inner slide plate is connected to the handle column through the guide rods and the hollow tube. Both the hollow tube and the handle plate are provided with flow guides.

[0012] Preferably, the flow guide includes a fixedly installed threaded sleeve, with a support ring fixed at one end of the inner wall of the threaded sleeve and a sealing ring fixed at the other end. A sealing block is installed inside the threaded sleeve, and the conical surface of the sealing block is sealed and fitted with the sealing ring. A spring is installed between the support ring and the sealing block to form a one-way air passage structure.

[0013] Preferably, the guiding device includes an upper chamber located above the inside of the handle column and a lower chamber located in the middle. An upper piston is slidably and sealingly installed in the upper chamber, and a lower piston is slidably and sealingly installed in the lower chamber. The upper piston and the lower piston are fixedly connected by a hexagonal rod to achieve coaxial movement.

[0014] Preferably, the top chamber of the fixed column is connected to the bottom of the lower chamber, the upper part of the lower chamber has side openings on both sides that extend to the outside of the handle column, the bottom wall of the upper chamber has an air inlet on one side, and the air inlet is connected to the end of the hollow tube; a scale rod is fixed on the top of the upper piston, and the scale rod extends upward and slidably to the outside of the top of the handle column.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. In this invention, a suction cup is placed inside the uterus of the mother, so that the inner side of the rubber protrusion on the suction cup is in contact with the head of the fetus. Then, air pressure is pushed into the guide device by a pushing device. After being driven by air pressure, the guide device generates a negative pressure suction force that acts inside the diversion device. The negative pressure suction force is transmitted to the conduit through the diversion device. Finally, the negative pressure suction force is transmitted to the inner cavity of the suction cup through the conduit, so that the suction cup generates suction force to adsorb the head of the fetus.

[0017] 2. When the pushing device is working in this invention, the manual holds the handle column and handle plate. At this time, the inner slide plate is located on one side of the air chamber. When the handle plate is pulled and pushed back and forth towards the handle column, the air inside the air chamber can be pushed to the guiding device, which will drive the guiding device to work.

[0018] 3. When the guiding device of the present invention is working, the pushing air is introduced into the upper chamber through the hollow tube and the air inlet, which in turn drives the upper piston to slide upward. When the upper piston slides upward, it will drive the lower piston to slide upward in the lower chamber through the hexagonal rod. When the lower piston slides upward, it draws the air inside the diversion chamber into the lower chamber through the grid opening, thereby generating a negative pressure suction force. Then, the negative pressure suction force is transmitted to the inner cavity of the suction cup through the conduit, and then the suction cup adsorbs the fetal head.

[0019] 4. When the diversion device of this invention is working, during the process of the suction cup adsorbing the fetal head, when the fluid inside the mother's uterus seeps into the suction cup and enters the diversion chamber through the conduit, the fluid will first be discharged into the diversion chamber from the through-hole. Inside the diversion chamber, the fluid will flow into the bottom storage, while the gas will enter the lower chamber through the grid opening. When the fluid accumulates on the bottom surface inside the diversion chamber, it will drive the annular float to slide upward along the fixed column. When the fluid accumulates, it will drive the annular float to float upward. The annular float will drive the sliding sleeve to slide to the top of the fixed column through the connecting rod. The inner wall of the sliding sleeve will seal the multiple grid openings to prevent the fluid from entering the upper chamber. Attached Figure Description

[0020] Figure 1 This invention provides a front-view three-dimensional structural diagram of a tire head suction device with anti-backflow function.

[0021] Figure 2 This invention provides a cross-sectional three-dimensional structural diagram of a tire head suction device with anti-backflow function;

[0022] Figure 3 This invention provides a cross-sectional three-dimensional structural diagram of the suction cup in a tire head suction device with anti-backflow function.

[0023] Figure 4 This invention provides a cross-sectional three-dimensional structural diagram of the handle column and handle plate in a tire head suction device with anti-backflow function.

[0024] Figure 5 This invention provides a three-dimensional cross-sectional view of one side of the handle column in a tire head suction device with anti-backflow function.

[0025] Figure 6 This invention provides a three-dimensional cross-sectional view of the other side of the handle column in a tire head suction device with anti-backflow function.

[0026] Figure 7 This invention provides a three-dimensional cross-sectional view of the internal structure of the handle column in a tire head suction device with anti-backflow function;

[0027] Figure 8 This invention provides a partial cross-sectional three-dimensional structural diagram of the annular float and sliding sleeve in a tire head suction device with anti-backflow function.

[0028] Figure 9 For the present invention Figure 5 A magnified view of a portion of point A in the middle;

[0029] Figure 10 For the present invention Figure 6 A magnified view of a portion of point B in the middle;

[0030] Figure 11 For the present invention Figure 7 A magnified view of a portion of point C in the middle;

[0031] Figure 12 For the present invention Figure 4 A magnified view of a portion of point D.

[0032] In the diagram: 1. Handle post; 2. Handle plate; 3. Guide rod; 4. Hollow tube; 5. Side opening; 6. Guide tube; 7. Suction cup; 8. Mesh pad; 9. Inner cavity; 10. Side suction channel; 11. Rubber convex ring; 12. Annular cavity; 13. Rubber diaphragm; 14. Air chamber; 15. Threaded sleeve; 16. Upper chamber; 17. Marking rod; 18. Upper piston; 19. Bending flow channel; 20. Air inlet; 21. Spring; 22. Hexagonal rod; 23. 24. Lower chamber; 25. Lower piston; 26. End cap; 27. Bottom tube; 28. Connecting rod; 29. ​​Connecting plate; 30. Diverter chamber; 31. Fixed column; 32. Inner sliding plate; 33. Annular float plate; 34. Sliding sleeve; 35. Inner sealing plate; 36. Connecting port; 37. Sliding block; 38. Bending port; 39. Grid port; 40. Inner sliding cavity; 41. Through port; 42. Slide groove; 43. Support ring; 44. Sealing ring; 45. Sealing block. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-12 The present invention provides a technical solution: a tire head suction device with anti-backflow, including a handle post 1, a guide tube 6 fixed on one side of the handle post 1, a suction cup 7 fixed at one end of the guide tube 6, a handle plate 2 provided on the other side of the handle post 1, a pushing device provided inside the handle plate 2, a diversion cavity 29 opened at the bottom of the handle post 1, a diversion device provided inside the diversion cavity 29, and a guiding device provided inside the handle post 1.

[0035] A rubber protruding ring 11 is fixed at the top edge of the suction cup 7. A wire mesh pad 8 is provided between the inner walls of the rubber protruding ring 11 at the top of the suction cup 7. An inner cavity 9 is opened in the middle of the suction cup 7. The top of the inner cavity 9 extends to the top of the suction cup 7. One end of the conduit 6 is connected to the inner cavity 9. Multiple side suction channels 10 are equally spaced along the circumferential direction on the bottom surface of the suction cup 7 near the edge. One end of each side suction channel 10 extends into the inner cavity 9. An annular cavity 12 is opened on the inner side of the rubber protruding ring 11. A rubber membrane 13 is provided between the inner walls of the annular cavity 12.

[0036] The effect is as follows: the suction cup 7 is placed inside the mother's uterus, so that the inner part of the rubber protrusion 11 on the suction cup 7 is in contact with the head of the fetus. Compressed air is introduced into the upper chamber 16 through the hollow tube 4 and the air inlet 20, which in turn drives the upper piston 18 to slide upwards. During this sliding process, the scale rod 17 slides upwards towards the top of the handle post 1. The strength of the suction force can be determined by observing the scale value on the scale rod 17, preventing excessive suction force from damaging the fetal head. Simultaneously, as the upper piston 18 slides upwards, it drives the lower piston 24 in the lower chamber 23 via the hexagonal rod 22. When the middle slides upward and the lower piston 24 slides upward, the air inside the diversion chamber 29 is drawn into the lower chamber 23 through the grid opening 38, thereby generating a negative pressure suction force. This negative pressure suction force is then transmitted to the inner cavity 9 inside the suction cup 7 through the conduit 6, allowing the suction cup 7 to adhere to the fetal head. Then, by pulling the handle column 1 outward, the suction cup 7 and the fetal head can be pulled and corrected outward. When the suction cup 7 is adsorbing, if liquid enters the diversion chamber 29 through the conduit 6, the diversion device will sense the liquid and seal the inside of the handle column 1 to prevent the liquid from entering the guiding device.

[0037] like Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11As shown, the diversion device includes a fixed column 30 fixed inside the diversion cavity 29. The interior of the fixed column 30 is hollow near the bottom and top. A bent flow channel 19 is formed near one edge inside the handle column 1. One end of the bent flow channel 19 is connected to the end of the guide tube 6, and the other end of the bent flow channel 19 is connected to the bottom of the fixed column 30. Multiple grid openings 38 are equidistantly formed at the top of the fixed column 30 along the circumferential direction. All grid openings 38 penetrate into the interior of the fixed column 30. Inner sliding cavities 39 are formed near both sides of the interior of the fixed column 30. The bottom of the two inner sliding cavities 39 extends to the bottom of the fixed column 30, and the upper end face of the fixed column 30 is located below the grid openings 38. Through-holes 40 penetrating into the interior of the fixed column 30 are formed at the middle of both outer surfaces of the fixed column 30. The outer surfaces of both sides of the fixed column 30 are provided with grooves 41 that penetrate into the inner sliding cavity 39. The through opening 40 and the inner sliding cavity 39 are interconnected. Both grooves 41 are located directly above the through opening 40. Both inner sliding cavities 39 are slidably provided with inner sealing plates 34. One side of the outer surface of the two inner sealing plates 34 is correspondingly slidably sealed and fitted with one side of the inner sliding cavity 39. One side of the two inner sealing plates 34 is provided with a connecting opening 35 near the top. Both connecting openings 35 are correspondingly aligned with the through opening 40. The outer surface of the fixed column 30 is slidably provided with a sliding sleeve 33. Both sides of the inner wall of the sliding sleeve 33 are fixed with sliders 36 near the bottom. The two sliders 36 are correspondingly slidably engaged in the grooves 41. One end of the two sliders 36 is correspondingly fixed to the outer surface of the inner sealing plate 34 near the top edge.

[0038] Two connecting rods 27 are fixed to the bottom of the sliding sleeve 33, and an end cap 25 is fixed to the bottom of the handle column 1. The bottom ends of the two connecting rods 27 slide through the end cap 25 and extend below it. A connecting plate 28 is fixed between the bottoms of the two connecting rods 27. A bottom tube 26 is fixedly connected to the bottom of the end cap 25. An annular float 32 is provided inside the flow divider 29 near the bottom. The annular float 32 is fixed between the two connecting rods 27. A gap is left between the inner side of the annular float 32 and the outer surface of the fixed column 30. A bend 37 is opened inside the two connecting rods 27. The top and bottom ends of the two bend 37 extend to the outer surface of the connecting rod 27. The tops of the two bend 37 are located at the sliding contact point between the connecting rod 27 and the handle column 1. The bottom of one bend 37 is located inside the end cap 25, and the bottom of the other bend 37 is located below the end cap 25 to prevent simultaneous pressure relief and air intake, which would cause the negative pressure to be unmaintained and the adsorption to fail.

[0039] The effect achieved is that, during the process of suction cup 7 adsorbing the fetal head, when the fluid inside the mother's uterus seeps into the suction cup 7 and enters the diversion chamber 29 through the conduit 6, the fluid will first be discharged into the diversion chamber 29 from the through port 40. Inside the diversion chamber 29, the fluid will flow into the bottom storage, while the gas will enter the lower chamber 23 through the grid port 38. When the fluid accumulates on the bottom surface inside the diversion chamber 29, it will drive the annular float 32 to slide upward along the fixed column 30, causing the connecting rod 27 to drive the sliding sleeve 33 to slide to the top of the fixed column 30. The inner wall of the sliding sleeve 33 will seal the multiple grid ports 38 to prevent the fluid from entering the upper chamber 16.

[0040] like Figure 1 , Figure 2 , Figure 4 and Figure 12 As shown, the pushing device includes an air chamber 14 inside the handle plate 2 and a slidingly sealed inner slide plate 31. The inner slide plate 31 is slidably sealed between the inner walls of the air chamber 14. Guide rods 3 are fixed on one side of the outer surface of the inner slide plate 31 near both ends. The inner slide plate 31 is connected to the handle column 1 through the guide rods 3 and the hollow tube 4. Both the hollow tube 4 and the handle plate 2 are provided with flow guides. The flow guides include a fixedly installed threaded sleeve 15. A support ring 42 is fixed at one end of the inner wall of the threaded sleeve 15, and a sealing ring 43 is fixed at the other end. A sealing block 44 is installed inside the threaded sleeve 15. The conical surface of the sealing block 44 is sealed and fitted with the sealing ring 43. A spring 21 is installed between the support ring 42 and the sealing block 44 to form a one-way air passage structure.

[0041] The effect achieved is as follows: when the manual hand holds the handle column 1 and handle plate 2, with the inner slide plate 31 located on one side of the air chamber 14, pulling the handle plate 2 back and forth against the handle column 1 pushes the air inside the air chamber 14 to the guiding device, causing the guiding device to work. Furthermore, during the reciprocating pulling of the handle plate 2 against the handle column 1, the airflow is controlled by two guide components. One guide component is located at the opening connecting the hollow tube 4 and the inner slide plate 31, and the other guide component is located on the rear side of the handle plate 2. The conical surface of the sealing block 44 in the guide component on the hollow tube 4 faces the air chamber 14, while the conical surface of the sealing block 44 in the guide component on the handle plate 2 faces the outside of the handle plate 2. Therefore, when the handle plate 2 is pulled back and forth against the handle column 1, the airflow is controlled by two guide components. When the handle post 1 is pushed, the air in the air chamber 14 pushes the sealing block 44 on the hollow tube 4 to one side. At this time, the hollow tube 4 is in a conductive state, while the sealing block 44 on the handle plate 2 is pressed in the opposite direction by the air in the air chamber 14, so that it contacts the inner wall of the sealing ring 43 and is in a closed state. When the handle plate 2 is pulled away from the handle post 1, the air chamber 14 is in a negative pressure state. At this time, under the negative pressure suction force, the sealing block 44 on the handle plate 2 is sucked inward, and the external air can enter the air chamber 14 through the handle plate 2. At the same time, under the elastic force of the spring 21, the sealing block 44 located inside the hollow tube 4 will be pushed into the sealing ring 43, so that the hollow tube 4 is closed and the internal pressure of the guiding device is prevented from being released.

[0042] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the guiding device includes an upper chamber 16 located above the inside of the handle post 1 and a lower chamber 23 in the middle. An upper piston 18 is slidably and sealedly installed in the upper chamber 16, and a lower piston 24 is slidably and sealedly installed in the lower chamber 23. The upper piston 18 and the lower piston 24 are fixedly connected by a hexagonal rod 22 to achieve coaxial movement. The top chamber of the fixed post 30 is connected to the bottom of the lower chamber 23. Side openings 5 ​​extending to the outside of the handle post 1 are opened on both sides of the upper part of the lower chamber 23. An air inlet 20 is opened on one side of the bottom wall of the upper chamber 16, and the air inlet 20 is connected to the end of the hollow tube 4. A marking rod 17 is fixed on the top of the upper piston 18, and the marking rod 17 extends upwards and slidably to the outside of the top of the handle post 1.

[0043] The effect is as follows: compressed air is introduced into the upper chamber 16 through the hollow tube 4 and the air inlet 20, which in turn drives the upper piston 18 to slide upward. During the sliding process, the scale rod 17 will slide upward to the top of the handle column 1. People can observe the scale value on the scale rod 17 to determine the magnitude of the suction force, so as to prevent the suction force from being too large and causing damage to the fetal head. At the same time, when the upper piston 18 slides upward, it will drive the lower piston 24 to slide upward in the lower chamber 23 through the hexagonal rod 22. When the lower piston 24 slides upward, it draws the air inside the diversion chamber 29 into the lower chamber 23 through the grid opening 38, thereby generating a negative pressure suction force. Then, the negative pressure suction force is transmitted to the inner cavity 9 inside the suction cup 7 through the conduit 6, so that the suction cup 7 can suction the fetal head.

[0044] Working principle: When using this device, place the suction cup 7 inside the mother's uterus, ensuring the inner side of the rubber protrusion 11 on the suction cup 7 is in contact with the fetal head. Then, manually hold the handle column 1 and handle plate 2. At this time, the inner sliding plate 31 is located on one side of the air chamber 14. When the handle plate 2 is pulled back and forth against the handle column 1, the air inside the air chamber 14 is pushed into the upper chamber 16 through the hollow tube 4 and the air inlet 20, thereby driving the upper piston 18 to slide upward. During the sliding process, it will drive the scale rod 17 to slide upward to the top of the handle column 1. By observing the scale value on the scale rod 17, the suction force can be determined, preventing excessive suction force from causing damage to the fetal head. At the same time, when the upper piston 18 slides upward, it will drive the lower piston 2 through the hexagonal rod 22. 4. As the lower piston 24 slides upward in the lower chamber 23, it draws air from the shunt chamber 29 into the lower chamber 23 through the grid opening 38, creating a negative pressure suction force. This negative pressure suction force is then transmitted to the inner cavity 9 of the suction cup 7 through the conduit 6, allowing the suction cup 7 to adhere to the fetal head. During this process, when fluid from the mother's uterus seeps into the suction cup 7 and enters the shunt chamber 29 through the conduit 6, the fluid first drains into the shunt chamber 29 through the through-hole 40. Inside the shunt chamber 29, the fluid flows into the bottom storage area, while the gas enters the lower chamber 23 through the grid opening 38. As the fluid accumulates at the bottom of the shunt chamber 29, it drives the annular float 32 along the fixed column 30. As the liquid accumulates, it causes the annular float 32 to float upwards. The annular float 32, via the connecting rod 27, causes the sliding sleeve 33 to slide to the top of the fixed column 30. The inner wall of the sliding sleeve 33 seals multiple grid openings 38, preventing liquid from entering the upper chamber 16. When the sliding sleeve 33 slides upwards, it causes the connecting rod 27 to slide upwards simultaneously. After the sliding sleeve 33 slides to the corresponding position, the top openings of the bends 37 on both connecting rods 27 slide to the bottom surface inside the diversion chamber 29 and communicate with it. The bottom opening of the bend 37 on one of the connecting rods 27 slides to the bottom of the handle column 1 and is located inside the end cap 25. The bottom opening of the bend 37 on the other connecting rod 27 is located below the end cap 25. At this time, in the diversion chamber... Under the negative pressure adsorption force of the 29, external air can be drawn into the interior through the bend 37, relieving the negative pressure state inside the diversion chamber 29. Then, the bottom pipe 26 is connected to the external extraction device to extract the liquid inside the diversion chamber 29. When the liquid inside the diversion chamber 29 is discharged, it flows out through the top opening of one of the bends 37 into the end cap 25. Air from outside the end cap 25 is sent into the diversion chamber 29 through the other bend 37 to prevent the formation of a sealed volume that would prevent the liquid from being discharged. After the liquid is discharged, pulling the connecting plate 28 will drive the connecting rod 27 to slide, causing the annular float 32 to reset. At this time, the negative pressure adsorption force can be generated again by the pushing device and the guiding device, allowing the suction cup 7 to continue adsorption. At the same time, when the sliding sleeve 33 slides upward,The slider 36 will cause the inner sealing plate 34 to slide upwards until the connecting port 35 and the through port 40 are misaligned. At this point, the inner surface of the bottom of the inner sealing plate 34 will seal against the through port 40, preventing the through port 40 from being blocked by airflow when liquid is discharged, which could cause the suction cup 7 to depressurize excessively and detach.

[0045] 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tire head suction device with anti-backflow function, characterized in that, Includes a handle post (1), a conduit (6) fixed on one side of the handle post (1), a suction cup (7) fixed at one end of the conduit (6), a handle plate (2) provided on the other side of the handle post (1), a pushing device provided inside the handle plate (2), a diversion cavity (29) opened at the bottom of the handle post (1), a diversion device provided inside the diversion cavity (29), and a guiding device provided inside the handle post (1).

2. A tire suction device with anti-backflow function according to claim 1, characterized in that: A rubber protruding ring (11) is fixed at the top edge of the suction cup (7). A wire mesh pad (8) is provided between the inner walls of the rubber protruding ring (11) at the top of the suction cup (7). An inner cavity (9) is opened in the middle of the suction cup (7). The top of the inner cavity (9) extends to the top of the suction cup (7). One end of the conduit (6) is connected to the inner cavity (9). Multiple side suction channels (10) are equidistantly opened along the circumferential direction on the bottom surface of the suction cup (7) near the edge. One end of each side suction channel (10) extends into the inner cavity (9). An annular cavity (12) is opened on the inner side of the rubber protruding ring (11). A rubber membrane (13) is provided between the inner walls of the annular cavity (12).

3. A tire suction device with anti-backflow function according to claim 1, characterized in that: The diversion device includes a fixed column (30) fixed inside the diversion cavity (29). The interior of the fixed column (30) is hollow near the bottom and top. A bent flow channel (19) is provided inside the handle column (1) near one side edge. One end of the bent flow channel (19) is connected to the end of the guide tube (6), and the other end of the bent flow channel (19) is connected to the bottom of the fixed column (30). Multiple grid openings (38) are provided at equal intervals along the circumferential direction on the top of the fixed column (30). All grid openings (38) penetrate into the interior of the fixed column (30). Inner sliding cavities (39) are provided inside the fixed column (30) near both sides edge. The bottom of the two inner sliding cavities (39) extends to the bottom of the fixed column (30), and the upper end face of the fixed column (30) is located below the grid openings (38).

4. A tire suction device with anti-backflow function according to claim 3, characterized in that: Both sides of the fixed column (30) have through openings (40) at the middle of their outer surfaces, which penetrate into the interior of the fixed column (30). Both sides of the fixed column (30) have grooves (41) that penetrate into the interior of the inner sliding cavity (39). The through openings (40) and the inner sliding cavity (39) are interconnected. Both grooves (41) are located directly above the through openings (40). Both inner sliding cavities (39) have inner sealing plates (34) that are slidably installed inside. One side of the outer surface of the two inner sealing plates (34) is corresponding to the inner side of the inner sliding cavity (39) and is slidably sealed and fitted.

5. A tire head suction device with anti-backflow function according to claim 4, characterized in that: One side of each of the two inner sealing plates (34) is provided with a connecting port (35) near the top. Both connecting ports (35) are aligned with the through port (40). A sliding sleeve (33) is slidably provided on the outer surface of the fixing post (30). A slider (36) is fixed on the inner wall of both sides of the sliding sleeve (33) near the bottom. The two sliders (36) are slidably engaged in the sliding groove (41). One end of each slider (36) is fixed on the outer surface of the inner sealing plate (34) near the top edge.

6. A tire head suction device with anti-backflow function according to claim 5, characterized in that: Two connecting rods (27) are fixed to the bottom of the sliding sleeve (33). An end cap (25) is fixed to the bottom of the handle column (1). The bottom ends of the two connecting rods (27) slide through the end cap (25) and extend below it. A connecting plate (28) is fixed between the bottoms of the two connecting rods (27). A bottom tube (26) is fixedly connected to the bottom of the end cap (25). An annular float (32) is provided inside the diversion cavity (29) near the bottom. The annular float (32) is fixed between the two connecting rods (27). There is a gap between the inner side of the annular float (32) and the outer surface of the fixed column (30). Both of the connecting rods (27) have a bend (37) inside. The top and bottom of the two bends (37) extend to the outer surface of the connecting rod (27). The top of the two bends (37) are located at the sliding contact point between the connecting rod (27) and the handle column (1). The bottom of one bend (37) is located inside the end cap (25), and the bottom of the other bend (37) is located below the end cap (25).

7. A tire head suction device with anti-backflow function according to claim 1, characterized in that: The pushing device includes an air chamber (14) inside the handle plate (2) and a sliding seal inner slide plate (31). The inner slide plate (31) is slidably sealed between the inner walls of the air chamber (14). Guide rods (3) are fixed on one side of the outer surface of the inner slide plate (31) near the two ends. The inner slide plate (31) is connected to the handle column (1) through the guide rods (3) and the hollow tube (4). Both the hollow tube (4) and the handle plate (2) are provided with flow guides.

8. A tire head suction device with anti-backflow function according to claim 7, characterized in that: The flow guide includes a fixedly installed threaded sleeve (15), with a support ring (42) fixed at one end of the inner wall of the threaded sleeve (15) and a sealing ring (43) fixed at the other end. A sealing block (44) is installed inside the threaded sleeve (15), and the conical surface of the sealing block (44) is sealed and fitted with the sealing ring (43). A spring (21) is installed between the support ring (42) and the sealing block (44) to form a one-way air passage structure.

9. A tire head suction device with anti-backflow function according to claim 3, characterized in that: The guiding device includes an upper chamber (16) located above the handle column (1) and a lower chamber (23) located in the middle. An upper piston (18) is slidably and sealed inside the upper chamber (16), and a lower piston (24) is slidably and sealed inside the lower chamber (23). The upper piston (18) and the lower piston (24) are fixedly connected by a hexagonal rod (22) to achieve coaxial movement.

10. A tire head suction device with anti-backflow function according to claim 9, characterized in that: The top chamber of the fixed column (30) is connected to the bottom of the lower chamber (23). The upper sides of the lower chamber (23) are provided with side openings (5) that extend to the outside of the handle column (1). The bottom wall of the upper chamber (16) is provided with an air inlet (20), which is connected to the end of the hollow tube (4). The top of the upper piston (18) is fixed with a scale rod (17), which extends upwards and can slide to the outside of the top of the handle column (1).

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