A device for preventing backflow of blood during intravenous infusion

Abstract

The application provides a venous transfusion nursing anti-backflow device, and belongs to the technical field of medical devices. The device comprises a catheter for transfusion liquid medicine, a flow guide element for guiding the liquid medicine is arranged in the middle of the catheter, a locking assembly is arranged outside the flow guide element, the locking assembly is used for extruding and blocking the liquid medicine, the locking assembly comprises an extrusion ring in sliding connection with the outer surface of the catheter, and a pressure plate is arranged on the inner side of the extrusion ring. In the above scheme, the locking assembly is arranged, the flow guide element is extruded and sealed by the contraction deformation of the flow guide element cooperating with the supporting sleeve, so that the flow of gas in the flow guide element and the catheter is prevented, the catheter can be locked and closed in time after the liquid medicine is discharged, and the risk of blood backflow can be effectively reduced. By blocking the catheter at the same time when the liquid medicine is discharged, the internal pressure of the catheter near the needle can be kept stable, and the anti-backflow precision of the transfusion device can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a device for preventing backflow of blood during intravenous infusion care. Background Technology

[0002] Intravenous infusion devices are medical devices used to directly introduce liquids, drugs, or nutrients into a patient's venous system. They mainly consist of infusion containers, infusion tubing, and puncture needles. Their core principle is to utilize the hydrostatic pressure generated by the height difference of the liquid. They are widely used in clinical treatment, and the correct use of intravenous infusion devices directly affects the treatment effect and patient safety.

[0003] Backflow of blood is a common occurrence during intravenous infusion, necessitating optimization of existing infusion devices. For example, Chinese utility model patent CN218685524U discloses an infusion set designed for easy fixation and backflow prevention. The magnetic cylinder of this set adheres to the outer wall of an iron support column, allowing for convenient and rapid height adjustment. A second sphere is located inside the first sphere; when blood flows into the first sphere, the spring force compresses the second sphere, preventing backflow. Once the medication in the reservoir is completely drained, the pressure inside decreases, causing blood to flow back into the infusion tubing under venous pressure.

[0004] Existing intravenous infusion backflow prevention devices, when blood backflow occurs, use the elasticity of a spring to drive a second ball to squeeze the blood and prevent further backflow. However, during this process, some blood has already flowed back into the infusion tube, and the backflow cannot be completely stopped, resulting in low accuracy in preventing backflow. Summary of the Invention

[0005] This invention provides an anti-backflow device for intravenous infusion care, which solves the technical problem that existing anti-backflow devices cannot completely prevent blood reflux and have low anti-backflow accuracy.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A backflow prevention device for intravenous infusion care includes a flow guide in the middle of the catheter, a locking assembly on the outside of the flow guide, the locking assembly including a compression ring slidably connected to the outer surface of the catheter, a pressure plate on the inner side of the compression ring, a contact block fixedly connected to the outer surface of the pressure plate, and a magnetic ring on the outside of the flow guide, with the contact block and the magnetic ring magnetically attracted; the backflow member and the pressure plate are both elastic components; the locking assembly is located at the catheter, the pressure plate is in a contracted state; the locking assembly is located at the lower middle part of the flow guide, the pressure plate is in an expanded state, and the pressure plate compresses the flow guide;

[0008] A clamp is fitted on the outside of the conduit, and an expansion member is installed on the inside of the clamp. Both the expansion member and the conduit are connected to the drip chamber.

[0009] Optionally, the guide member has an embedded storage groove on its inner side, the magnetic ring is located inside the storage groove, the extrusion ring has an embedded mounting groove on its inner side, the pressure plate has a U-shaped structure and is made of elastic material, the pressure plates are in several groups and are distributed in a ring array, and the contact block is in sliding contact with the outer surface of the pressure plate.

[0010] Optionally, the inner side of the flow guide is hollow, and a shrinkage component is provided on the inner side of the flow guide. The shrinkage component includes a support sleeve fixedly connected to the lower side of the inner surface of the flow guide. A flow guide channel is provided between the flow guide and the support sleeve. An overflow channel is provided through the outer surface of the lower end of the flow guide. A through hole is provided through the outer surface of the support sleeve. A pull plate is fixedly connected to the inner wall of the flow guide.

[0011] Optionally, the guide element is made of elastic material, the overflow channel is in several groups and arranged in a ring array, the pull plate is in two groups and arranged symmetrically, the upper end of the support sleeve is conical, and the pull plate is made of elastic material.

[0012] Optionally, the outer side of the clamping plate is provided with a pressure-increasing part for increasing the clamping pressure, the upper end of the conduit is detachably connected to a dripping bucket, the pressure-increasing part includes a bending groove that passes through the inner side of the clamping plate, an expansion member is fixedly connected to the inner surface of the clamping plate, a connecting pipe one is fixedly connected to the outer surface of the upper end of the expansion member, the upper end of the connecting pipe one communicates with the inside of the dripping bucket, and a connecting pipe two is embedded and fixedly connected to the inner side of the clamping plate, the connecting pipe two communicates with the inside of the conduit.

[0013] Optionally, the clamp has a V-shaped structure, the conduit extends in a V-shape inside the clamp, a fixing plate is fixedly connected to the outer surface of the lower end of the clamp, a slide rod is slidably connected to the outer surface of the fixing plate, a support plate is fixedly connected to the outer surface of the slide rod away from the fixing plate, and a spring is sleeved on the outer side of the slide rod.

[0014] Optionally, a movable frame is fixedly connected to the front and rear ends of the outer surface of the support plate, and an extrusion roller is rotatably connected to the outer surface of the movable frame. The outer surface of the extrusion tube is in rotatable contact with the upper and lower ends of the clamping plate, respectively.

[0015] Optionally, an elastic lever is fixedly connected to the inner surface of the conduit, and a squeezing block is fixedly connected to the outer surface of the lower end of the elastic lever. The number of elastic levers and squeezing blocks are several groups and they are distributed in a ring array. The squeezing block corresponds to the position of the connecting tube.

[0016] Optionally, a sliding groove is formed through the lower outer surface of the clamping plate, a traction rod is slidably connected to the inner side of the sliding groove, the lower end of the traction rod is fixedly connected to the support plate, an extrusion plate is slidably connected to the lower side of the inner surface of the clamping plate, an extrusion groove is formed through the outer surface of the extrusion plate, the side of the traction rod away from the support plate is fixedly connected to the extrusion plate, and the extrusion plate is sleeved on the outside of the guide tube through the extrusion groove, the extrusion groove having a V-shaped structure.

[0017] Optionally, the outer surface of the expansion member is arc-shaped and made of elastic material, the outer surface of the expansion member is embedded with a folding groove, and the outer surface of the conduit is embedded with a bending slit at the bend.

[0018] The beneficial effects of the above-described technical solution of the present invention are as follows:

[0019] In the above solution, by setting a locking component, the flow guide can be squeezed and sealed by the contraction and deformation of the flow guide in conjunction with the support sleeve, thereby preventing the flow of gas inside the flow guide and the catheter. After the drug solution is discharged, the catheter can be locked and closed in time, thereby effectively reducing the risk of blood backflow. By blocking the catheter at the same time as the drug solution is drained, the internal pressure of the catheter near the needle can be kept stable, thereby effectively improving the anti-backflow accuracy of the infusion device.

[0020] By setting up components such as clamps and squeeze rollers, the clamps will squeeze the catheter during the movement, causing the catheter to bend inside the clamps. The deformation and bending of the catheter can further block the inside of the catheter, thereby improving the sealing effect of the catheter and helping to reduce the probability of backflow of medicine inside the catheter, which can effectively improve the safety and reliability of the infusion device during operation.

[0021] By incorporating components such as a compression plate, the compression plate applies a certain amount of pressure to the catheter through the compression groove during its movement, causing the catheter to deform inward and block the flow inside. By setting multiple blocking structures at different positions on the catheter, the catheter can be automatically blocked and sealed at different positions when the medication inside the catheter is drained. This effectively reduces the risk of blood backflow caused by changes in pressure inside the catheter, further improving the anti-backflow effect of the infusion device. At the same time, it eliminates the need for manual operation, thus improving the ease of use of the infusion device to a certain extent. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the intravenous infusion nursing anti-backflow device of the present invention;

[0023] Figure 2 This is a top view of the overall structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 Sectional view along line AA;

[0025] Figure 4 This is a schematic diagram of the extrusion plate and extrusion groove structure of the present invention;

[0026] Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle;

[0027] Figure 6 For the present invention Figure 3 Enlarged view of point C in the middle;

[0028] Figure 7 For the present invention Figure 3 Enlarged view of point D;

[0029] Figure 8 For the present invention Figure 3 Enlarged diagram of point E in the middle.

[0030] [Figure Labels]

[0031] 11. Dropper; 12. Guide tube; 13. Clamping plate; 14. Connecting pipe one; 15. Expansion component; 16. Folding groove; 17. Extrusion roller; 18. Bending groove; 19. Movable frame; 20. Fixing plate; 21. Bending seam; 22. Connecting pipe two; 23. Slide groove; 24. Traction rod; 25. Support plate; 27. Spring; 28. Slide rod; 29. ​​Elastic lever; 30. Extrusion block; 31. Extrusion plate; 32. Flow guide; 33. Collection groove; 34. Magnetic ring; 35. Extrusion ring; 36. Mounting groove; 37. Pressure plate; 38. Contact block; 39. Flow guide channel; 40. Pull plate; 41. Support sleeve; 42. Through hole; 43. Overflow channel; 44. Extrusion groove. Detailed Implementation

[0032] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 8 As shown, an embodiment of the present invention provides an anti-backflow device for intravenous infusion care, including a catheter 12 for infusion medication, a guide 32 for draining the medication is provided in the middle of the catheter 12, and a locking assembly is provided on the outside of the guide 32, the locking assembly being used to squeeze and block the medication. Figure 7As shown, the locking assembly includes a compression ring 35 slidably connected to the outer surface of the conduit 12. A pressure plate 37 is disposed inside the compression ring 35, and the pressure plate 37 is used to compress the flow guide 32. A contact block 38 is fixedly connected to the outer surface of the pressure plate 37, and a magnetic ring 34 is disposed on the outer side of the flow guide 32. The diameter of the flow guide 32 is larger than the diameter of the conduit 12, and the contact block 38 and the magnetic ring 34 are magnetically attracted to each other. Figure 1 As shown, a clamping plate 13 is sleeved on the outside of the conduit 12. The clamping plate 13 is used to bend the conduit 12. A pressure-increasing part is provided on the outside of the clamping plate 13 to increase the squeezing force of the clamping plate 13.

[0034] like Figure 7 As shown, the guide member 32 has an embedded storage groove 33 on its inner side, the magnetic ring 34 is located inside the storage groove 33, the extrusion ring 35 has an embedded mounting groove 36 on its inner side, the pressure plate 37 has a U-shaped structure and is made of elastic material, the pressure plate 37 is in several groups and is distributed in a ring array, and the contact block 38 slides in contact with the outer surface of the pressure plate 37.

[0035] By adopting the above technical solution, during the infusion process, the catheter 12 is used to introduce the medication into the patient's vein. To reduce the risk of blood backflow during the infusion process, a locking component is provided. The medication is introduced into the guide member 32 through the catheter 12. The support sleeve 41 is used to divide the internal space of the guide member 32. After the medication enters the guide member 32, it will be located between the support sleeve 41 and the guide member 32. The guide member 32 will remain in a full state under the squeezing force of the medication. At this time, the diameter of the guide member 32 will be larger than the diameter of the catheter 12. At this time, the compression ring 35 is located on the upper side of the guide member 32. The catheter 12 is housed and installed with the magnetic ring 34 through the receiving groove 33, thereby keeping the outer surface of the catheter 12 flat. After the medication is discharged from the guide member 32, the pressure inside the guide member 32 disappears. At this time, the guide member 32 will contract inward under its own elasticity, causing the diameter of the guide member 32 to gradually decrease. At this time, the compression ring 35 slides along the surface of the catheter 12 to the outside of the guide member 32 under the action of gravity. The compression ring 35 will apply an inward squeezing force to the guide member 32. The contraction and deformation of the guide member 32, together with the support sleeve 41, can squeeze and seal the guide member 32, thereby preventing the flow of gas inside the guide member 32 and the catheter 12. After the medication is discharged, the catheter 12 can be locked and closed in time, thereby effectively reducing the risk of blood backflow. By blocking the catheter 12 at the same time as the medication is drained, the pressure inside the catheter 12 near the needle can be kept stable, thereby effectively improving the anti-backflow accuracy of the infusion device.

[0036] For example Figure 7As shown, when the squeezing ring 35 moves to the outside of the guide member 32, the squeezing ring 35 drives the pressure plate 37 to move synchronously through the mounting groove 36. The pressure plate 37 applies a certain squeezing force to the contact block 38, thereby keeping the contact block 38 and the pressure plate 37 moving synchronously. When the contact block 38 moves to the magnetic ring 34, the magnetic ring 34 magnetically attracts the contact block 38, causing the contact block 38 to stay outside the magnetic ring 34. At this time, as the squeezing ring 35 and the pressure plate 37 continue to slide downward, the pressure plate 37 will disengage from the contact block 38. At this time, the pressure plate 37 flips to one side of the guide member 32 under its own elastic force. The deformation of the pressure plate 37 can effectively increase the squeezing force on the guide member 32, thereby further improving the locking and sealing effect of the guide member 32, and further improving the anti-backflow effect of the infusion device.

[0037] like Figure 3 , Figure 7 and Figure 8 As shown, the inner side of the flow guide 32 is hollow, and a contraction assembly is provided inside the flow guide 32. The contraction assembly includes a support sleeve 41 fixedly connected to the lower side of the inner surface of the flow guide 32. A flow guide channel 39 is provided between the flow guide 32 and the support sleeve 41. An overflow channel 43 is formed through the lower outer surface of the flow guide 32, and a through hole 42 is formed through the outer surface of the support sleeve 41. A pull plate 40 is fixedly connected to the inner wall of the flow guide 32 via the support sleeve 41. The flow guide 32 is made of elastic material. The overflow channels 43 are arranged in several groups in a ring array. The pull plates 40 are arranged in two groups symmetrically. The upper end of the support sleeve 41 is conical, and the pull plates 40 are made of elastic material.

[0038] By adopting the above technical solution, the liquid medicine flows into the guide member 32 and is stored in the guide channel 39. The upper end of the support sleeve 41 is conical, which can evenly guide the liquid medicine into the guide channel 39, so that the guide member 32 remains in a full and expanded state under the action of the liquid medicine. Then, under the action of gravity, the liquid medicine will pass through the overflow channel 43 on the lower side of the guide member 32 and enter the lower conduit 12. There are several sets of overflow channels 43, which can make the liquid medicine injected into the conduit 12 at a constant flow rate. When the liquid medicine in the guide channel 39 is discharged, the guide member 32 will contract inward from the full state under the elastic force of the pull plate 40, which can further increase the contraction deformation range of the guide member 32 to ensure the normal sliding of the extrusion ring 35.

[0039] like Figure 1 and Figure 3As shown, the upper end of the conduit 12 is detachably connected to a dripping funnel 11. The pressurizing part includes a bending groove 18 that passes through the inner side of the clamping plate 13. An expansion member 15 is fixedly connected to the inner surface of the clamping plate 13. A connecting pipe 14 is fixedly connected to the outer surface of the upper end of the expansion member 15. The upper end of the connecting pipe 14 is connected to the inside of the dripping funnel 11. A connecting pipe 22 is embedded and fixedly connected to the inner side of the clamping plate 13. The connecting pipe 22 is connected to the inside of the conduit 12.

[0040] like Figure 6 As shown, an elastic lever 29 is fixedly connected to the inner surface of the conduit 12, and a squeezing block 30 is fixedly connected to the outer surface of the lower end of the elastic lever 29. The number of elastic levers 29 and squeezing blocks 30 are several groups and they are arranged in a ring array. The squeezing block 30 corresponds to the position of the connecting tube 22.

[0041] By adopting the above technical solution, the bending groove 18 on the surface of the clamp 13 can reduce the deformation resistance of the clamp 13 to a certain extent. The medicine in the dripping funnel 11 flows into the conduit 12. The upper and lower ends of the clamp 13 are fixedly connected to the conduit 12, so that the conduit 12 remains bent inside the clamp 13. When the medicine flows inside the conduit 12, the medicine will impact the elastic paddle 29. At this time, the elastic paddle 29 distributed in a ring array has its own elasticity and diffuses under the impact force of the medicine. The elastic paddle 29 drives the squeezing block 30 to keep it tightly attached to the inner wall of the conduit 12. The squeezing block 30 can seal the liquid outlet of the connecting tube 22, thereby preventing the flow of medicine inside the connecting tube 22. Part of the medicine in the dripping funnel 11 will enter the expansion member 15 through the connecting tube 14. The expansion member 15 will remain in an expanded state under the squeezing force of the medicine. The expansion sleeve can apply an outward expansion force to the clamp 13, thereby keeping the clamp 13 in a V-shaped expansion state.

[0042] After the medication is discharged from the infusion tubing and drip chamber 11, the impact force of the medication on the elastic lever 29 will disappear. At this time, the squeezing pressure between the squeezing block 30 and the inner wall of the catheter 12 will decrease synchronously. Under the action of gravity, the medication inside the expansion member 15 will be discharged into the catheter 12 through the connecting tube 22. As the medication inside the expansion member 15 is gradually discharged, the expansion member 15 will gradually fold and contract under its own elastic force. At this time, the clamp 13 will gradually converge under its own elastic force, so that the expansion angle of the clamp 13 will gradually decrease. During the movement, the clamp 13 will squeeze the catheter 12, so that the catheter 12 will bend inside the clamp 13. The deformation and bending of the catheter 12 can further block the inside of the catheter 12, thereby further improving the sealing effect of the catheter 12, helping to reduce the probability of backflow of medication inside the catheter 12 and thus effectively improving the safety and reliability of the infusion device during operation.

[0043] like Figures 3-5 As shown, the clamping plate 13 has a V-shaped structure, and the guide tube 12 extends in a V-shape inside the clamping plate 13. A fixing plate 20 is fixedly connected to the lower outer surface of the clamping plate 13. A sliding rod 28 is slidably connected to the outer surface of the fixing plate 20. A support plate 25 is fixedly connected to the outer surface of the sliding rod 28 away from the fixing plate 20. A spring 27 is sleeved on the outer side of the sliding rod 28, and the two ends of the spring 27 are respectively connected to the fixing plate 20 and the support plate 25. A movable frame 19 is fixedly connected to the front and rear ends of the outer surface of the support plate 25. A pressing roller 17 is rotatably connected to the outer surface of the movable frame 19, and the outer surface of the pressing roller 17 is in rotatable contact with the upper and lower ends of the clamping plate 13.

[0044] By adopting the above technical solution, the movable frame 19 is used to support the rotation of the extrusion roller 17. The extrusion roller 17 rotates and contacts the upper and lower sides of the clamping plate 13. The fixed plate 20 applies a certain tension to the support plate 25 through the spring 27. The support plate 25 drives the extrusion roller 17 to keep it in close contact with the outer surface of the clamping plate 13 through the movable frame 19. The two sets of extrusion rollers 17 can increase the contraction pressure of the clamping plate 13 to a certain extent. After the liquid medicine inside the expansion member 15 is discharged, as the angle of the clamping plate 13 gradually decreases, the support plate 25 slides along the lower side of the clamping plate 13 towards the fixed plate 20 under the elastic force of the spring 27. The slide rod 28 is slidably connected to the fixed plate 20 and can limit the spring 27. During the movement, the support plate 25 will drive the extrusion roller 17 to move synchronously through the movable frame 19. The two sets of extrusion rollers 17 can squeeze the clamping plate 13, thereby increasing the extrusion pressure of the clamping plate 13 on the guide tube 12 to a certain extent, thereby further improving the bending and sealing effect of the guide tube 12.

[0045] like Figure 5 As shown, a sliding groove 23 is formed through the lower outer surface of the clamping plate 13, and a traction rod 24 is slidably connected to the inner side of the sliding groove 23. The lower end of the traction rod 24 is fixedly connected to the support plate 25. Figure 6 As shown, an extrusion plate 31 is slidably connected to the lower side of the inner surface of the clamping plate 13, and an extrusion groove 44 is formed through the outer surface of the extrusion plate 31 (e.g., Figure 4 As shown), the traction rod 24 is fixedly connected to the extrusion plate 31 on the side away from the support plate 25. The extrusion plate 31 is sleeved on the outside of the guide tube 12 through the extrusion groove 44, which has a V-shaped structure.

[0046] By adopting the above technical solution, during the movement of the support plate 25, the compression plate 31 will move synchronously through the traction rod 24. The compression groove 44 on the surface of the compression plate 31 is sleeved on the outside of the catheter 12. When the compression plate 31 moves towards the expansion member 15, due to the V-shaped structure of the compression groove 44, the compression plate 31 will apply a certain compression force to the catheter 12 through the compression groove 44 during the movement, thereby causing the catheter 12 to undergo a convergence deformation inward to block the inside of the catheter 12. By setting multiple sets of blocking structures at different positions of the catheter 12, when the medicine inside the catheter 12 is drained, it can automatically block and seal the catheter 12 at different positions, thereby effectively reducing the risk of blood backflow caused by pressure changes inside the catheter 12, which helps to further improve the anti-backflow effect of the infusion device. At the same time, no manual operation is required, which can improve the ease of use of the infusion device to a certain extent.

[0047] like Figure 1 As shown, the outer surface of the expansion member 15 is arc-shaped and made of elastic material. A folding groove 16 is embedded in the outer surface of the expansion member 15, and a bending slit 21 is embedded in the curved section of the outer surface of the conduit 12. By adopting the above technical solution, the folding groove 16 on the surface of the expansion member 15 can reduce the deformation resistance of the expansion member 15 to a certain extent, thereby enabling more precise expansion and contraction of the expansion member 15. The bending slit 21 on the surface of the conduit 12 not only reduces the bending pressure of the conduit 12 but also allows the conduit 12 to bend at a predetermined position, thereby improving the bending blocking accuracy of the conduit 12.

[0048] The working process of the intravenous infusion nursing anti-backflow device provided by the present invention is as follows:

[0049] During infusion, catheter 12 is used to deliver the medication solution into the patient's vein. Part of the medication solution in drip chamber 11 enters the expansion member 15 through connecting tube 14. The expansion member 15 remains expanded under the pressure of the medication solution. Elastic lever 29 drives the compression block 30 to maintain a tight fit with the inner wall of catheter 12, sealing the outlet end of connecting tube 22. After the medication solution is discharged from the guide member 32, the guide member 32 contracts inward under its own elasticity, causing its diameter to gradually decrease. The guide member 32 contracts inward from its full state under the elasticity of pull plate 40, further increasing the contraction deformation amplitude. Compression ring 35 applies inward pressure to the guide member 32, and the contraction deformation of the guide member 32, combined with the support sleeve 41, seals the guide member 32. When the contact block 38 moves to the magnetic ring 34, the magnetic ring 34 magnetically attracts the contact block 38, causing the contact block 38 to remain outside the magnetic ring 34. Under its own elastic force, the pressure plate 37 flips to one side of the guide member 32. The deformation of the pressure plate 37 effectively increases the squeezing force on the guide member 32, thereby further improving the locking and sealing effect of the guide member 32. As the liquid inside the expansion member 15 is gradually discharged, the clamping plate 13 gradually converges under its own elastic force. During the movement, the clamping plate 13 squeezes the conduit 12, causing the conduit 12 to bend inside the clamping plate 13. The deformation and bending of the conduit 12 further blocks the inside of the conduit 12. During the movement, the support plate 25 drives the squeezing roller 17 to move synchronously through the movable frame 19. The two sets of squeezing rollers 17 can squeeze the clamping plate 13, thereby increasing the squeezing force of the clamping plate 13 on the conduit 12 to a certain extent. During its movement, the squeezing plate 31 applies a certain squeezing force to the catheter 12 through the squeezing groove 44, thereby causing the catheter 12 to undergo a converging deformation inward and blocking the inside of the catheter 12, which helps to further improve the anti-backflow effect of the infusion device.

[0050] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A device for preventing backflow in intravenous infusion, comprising a catheter for infusion of medication, characterized in that, A flow guide is provided in the middle of the conduit, and a locking assembly is provided on the outside of the flow guide. The locking assembly includes a compression ring that is slidably connected to the outer surface of the conduit. A pressure plate is provided on the inner side of the compression ring, and a contact block is fixedly connected to the outer surface of the pressure plate. A magnetic ring is provided on the outside of the flow guide, and the contact block and the magnetic ring are magnetically attracted to each other. The backflow member and the pressure plate are both elastic components. The locking assembly is located at the conduit. The pressure plate is in a contracted state. The locking assembly is located at the lower middle part of the flow guide. The pressure plate is in an expanded state, and the pressure plate compresses the flow guide. A clamp is fitted on the outside of the conduit, and an expansion member is installed on the inside of the clamp. Both the expansion member and the conduit are connected to the drip chamber.

2. The intravenous infusion nursing anti-backflow device according to claim 1, characterized in that, The guide member has an embedded storage groove on its inner side, the magnetic ring is located inside the storage groove, the extrusion ring has an embedded mounting groove on its inner side, the pressure plate has a U-shaped structure and is made of elastic material, the pressure plate is in several groups and is distributed in a ring array, and the contact block is in sliding contact with the outer surface of the pressure plate.

3. The intravenous infusion nursing anti-backflow device according to claim 2, characterized in that, The inner side of the flow guide is hollow, and a shrinkage component is provided on the inner side of the flow guide. The shrinkage component includes a support sleeve fixedly connected to the lower side of the inner surface of the flow guide. A flow guide channel is provided between the flow guide and the support sleeve. An overflow channel is opened through the outer surface of the lower end of the flow guide. A through hole is opened through the outer surface of the support sleeve. A pull plate is fixedly connected to the inner wall of the flow guide.

4. The intravenous infusion nursing anti-backflow device according to claim 3, characterized in that, The flow guide is made of elastic material, the overflow channel is in several groups and arranged in a ring array, the pull plate is in two groups and arranged symmetrically, the upper end of the support sleeve is conical, and the pull plate is made of elastic material.

5. The intravenous infusion nursing anti-backflow device according to claim 4, characterized in that, The outer side of the clamping plate is provided with a pressure-increasing part for increasing the clamping force. The upper end of the conduit is detachably connected to a dripping bucket. The pressure-increasing part includes a bending groove that runs through the inner side of the clamping plate. An expansion member is fixedly connected to the inner surface of the clamping plate. A connecting pipe one is fixedly connected to the outer surface of the upper end of the expansion member. The upper end of the connecting pipe one is connected to the inside of the dripping bucket. A connecting pipe two is embedded and fixedly connected to the inner side of the clamping plate. The connecting pipe two is connected to the inside of the conduit.

6. The intravenous infusion nursing anti-backflow device according to claim 5, characterized in that, The clamp has a V-shaped structure, and the conduit extends in a V-shape inside the clamp. A fixing plate is fixedly connected to the outer surface of the lower end of the clamp. A sliding rod is slidably connected to the outer surface of the fixing plate. A support plate is fixedly connected to the outer surface of the sliding rod away from the fixing plate. A spring is sleeved on the outer side of the sliding rod.

7. The intravenous infusion nursing anti-backflow device according to claim 6, characterized in that, The support plate has a movable frame fixedly connected to its front and rear ends on its outer surface. The movable frame is rotatably connected to an extrusion roller. The outer surface of the extrusion tube is in rotatable contact with the upper and lower ends of the clamping plate, respectively.

8. The intravenous infusion nursing anti-backflow device according to claim 7, characterized in that, An elastic lever is fixedly connected to the inner surface of the conduit, and a compression block is fixedly connected to the outer surface of the lower end of the elastic lever. The number of elastic levers and compression blocks are several groups, which are distributed in a ring array. The compression block corresponds to the position of the connecting tube.

9. The intravenous infusion nursing anti-backflow device according to claim 8, characterized in that, A sliding groove is formed through the lower outer surface of the clamping plate. A traction rod is slidably connected to the inner side of the sliding groove. The lower end of the traction rod is fixedly connected to the support plate. An extrusion plate is slidably connected to the lower side of the inner surface of the clamping plate. An extrusion groove is formed through the outer surface of the extrusion plate. The side of the traction rod away from the support plate is fixedly connected to the extrusion plate. The extrusion plate is sleeved on the outside of the guide tube through the extrusion groove, and the extrusion groove has a V-shaped structure.

10. The intravenous infusion nursing anti-backflow device according to claim 9, characterized in that, The outer surface of the expansion member is arc-shaped and made of elastic material. A folding groove is embedded in the outer surface of the expansion member, and a bending slit is embedded in the curved part of the outer surface of the conduit.

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