Blood return prevention infusion apparatus

Abstract

The invention provides a blood return prevention infusion apparatus, and belongs to the technical field of infusion apparatuses. Comprising an infusion apparatus drip cup, a fixing ring is fixedly connected in the infusion apparatus drip cup, a liquid storage box located above the fixing ring is arranged in the infusion apparatus drip cup in a sleeved mode, and evenly-distributed supporting pieces are fixedly connected to the inner side wall of the liquid storage box. By arranging the liquid storage box, the supporting piece and the sealing disc, the supporting piece supports the fixing disc under the action of self elasticity, the sealing disc is limited, the sealing state of the sealing disc on a water outlet in the bottom end of the liquid storage box is maintained, and liquid medicine entering a drip cup of the infusion apparatus is accumulated in the liquid storage box; after the liquid medicine in the liquid storage box is accumulated to a certain weight, the sealing disc can be pressed down, the water outlet is opened, normal infusion work of the infusion apparatus is guaranteed, after infusion work is completed, the sealing disc is reset and closed through the elastic force of the supporting piece, the water outlet is sealed again, and the infusion effect is improved. And the blood return phenomenon caused by negative pressure generated in the infusion pipeline is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of infusion sets, and in particular to an anti-blood-back infusion set. Background Art

[0002] An infusion set, also known as an intravenous infusion device, is a medical device used to deliver liquid medicine into the patient's body through the veins. The entire infusion set is mainly composed of an infusion bottle or bag, infusion tube, regulator, drip pot, filter, needle and other structures. The use of the infusion set needs to follow strict aseptic operating procedures to prevent infection. Medical staff will set the infusion speed according to the doctor's orders and the patient's specific conditions, and regularly check the infusion set and puncture site to ensure safe and effective infusion.

[0003] After the infusion is completed, the medical staff will remove the needle in time and guide the patient or family members to press the puncture site correctly to prevent bleeding or congestion. However, when the number of patients receiving infusion is large and the number of relevant medical staff is insufficient, the medical staff often cannot take care of each patient in time, which results in some patients not being able to remove the needle in time to end the infusion after completing the infusion. When the pressure in the blood vessel is higher than the pressure in the infusion device, blood refluxes into the infusion tube. The blood return from the infusion device can cause local vascular dilation, resulting in mild pain, and cause local blood circulation problems, resulting in blood congestion and swelling. If the blood return time is long and not treated, the local accumulation of blood may become viscous, increasing the risk of thrombosis. Therefore, the present application provides an anti-blood backflow infusion device to meet the needs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an anti-blood backflow infusion device to solve the problem of blood backflow caused by failure to remove the needle in time after the infusion is completed in the existing infusion device.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: 14. The infusion set as claimed in claim 13, wherein the cover has an arc portion extending therefrom and wherein the cover has a cam portion extending therefrom and wherein the cover has a cam portion extending therefrom. The cover has a plurality of arc portions extending therefrom and wherein the cover has a plurality of arc portions extending therefrom. The cover has a plurality of arc portions extending therefrom and wherein the cover has a plurality of arc portions extending therefrom.

[0006] Optionally, an input port is provided in the middle of the top of the liquid storage box, and a first guide surface inclined toward the central area of ​​the input port is provided at the top of the liquid storage box, and the opening of the input port is bent toward the inside of the liquid storage box to form a rolling groove between the input port and the inner wall of the liquid storage box.

[0007] Optionally, the bottom end of the liquid storage box is fixedly connected with evenly distributed fixing columns, the ends of the fixing columns are fixedly connected with connectors, and the fixing ring is provided with fixing holes corresponding to the positions of the fixing columns and the connectors.

[0008] Optionally, the sealing assembly includes a sealing strip fixedly connected to the closing disk, the sealing strip is located on a surface of the closing disk close to the bottom of the liquid storage box, and a sealing groove matching the shape of the sealing strip is formed at the bottom end of the liquid storage box.

[0009] Optionally, the top end of the sealing strip is bent and rolled toward the outside of the closing disk to form a snap-fit ​​edge, a third contact surface is provided on the side of the snap-fit ​​edge facing the bottom of the liquid storage box, an avoidance groove is provided at the connection between the sealing strip and the snap-fit ​​edge, and the sealing strip as a whole is a hollow structure.

[0010] Optionally, the viscous assembly includes a viscous tube sleeved on the outside of the connecting rod, the bottom end of the viscous tube is connected to the second guide surface via a support seat, the support seat is in an inverted trumpet shape, and the outside of the support seat is provided with evenly distributed through openings, and the openings of the through openings extend to the outer surface of the second guide surface.

[0011] Optionally, the viscous tube is sleeved with a plurality of viscous strips evenly distributed from top to bottom, the outside of the connecting rod is fixedly connected with a positioning ring adapted to the size of the viscous strip, a first contact surface is provided on a side of the viscous strip away from the support seat, and a second contact surface is provided on a side of the viscous strip close to the support seat, and an angle between the first contact surface and the inner wall of the viscous tube is greater than an angle between the second contact surface and the inner wall of the viscous tube.

[0012] Optionally, the support sheet is Z-shaped, with the two ends of the support sheet being fixedly connected to the inner wall of the liquid storage box and the bottom surface of the fixed plate respectively, and a weakening groove is provided in the middle of the support sheet, and the thickness values ​​of the two connecting ends of the support sheet are greater than the thickness values ​​of other areas on the support sheet.

[0013] Optionally, the limiting assembly includes a limiting plate fixedly connected to the top end of the viscous tube, the limiting plate is parallel to the fixed plate, a slope is provided at the outer edge of the fixed plate, and the diameter of the fixed plate is greater than the diameter of the viscous tube.

[0014] Optionally, the limiting plate is provided with evenly distributed limiting grooves, the positions of the limiting grooves correspond to the positions of the supporting sheet, and the shapes of the limiting grooves are adapted to the shape of the supporting sheet.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by providing a liquid storage box, a support sheet and a closing plate, the support sheet supports the fixed plate by relying on its own elastic force, limits the closing plate, maintains the closing state of the closing plate on the water outlet at the bottom of the liquid storage box, and the medicine entering the drip pot of the infusion device accumulates in the liquid storage box. When the medicine in the liquid storage box accumulates to a certain weight, the closing plate can be pressed down to open the water outlet, thereby ensuring the normal infusion work of the infusion device. After the infusion work is completed, the closing plate is reset and closed by the elastic force of the support sheet, and the water outlet is closed again to avoid negative pressure in the infusion pipeline and blood return.

[0016] By setting up the sealing component, when the closing disk and the supporting sheet are in the first state, the sealing strip in the sealing component can cooperate with the sealing groove to close the gap between the top of the closing disk and the bottom surface of the liquid storage box, thereby ensuring the closing effect of the closing disk on the water outlet and forming a seal, further improving the closing effect of the infusion pipeline after the infusion is completed, and improving the anti-blood backflow effect of the infusion set.

[0017] By setting up a viscous component, there is a certain residence time when the position of the closing disk and the support plate switches between the first state and the second state. That is, after no more medicine enters the liquid storage box, the water outlet is maintained in an open state for a period of time to discharge all the medicine in the liquid storage box as much as possible, thereby reducing the residual medicine in the liquid storage box, improving the utilization rate of the medicine, and making the entire infusion device solution more complete.

[0018] By setting the limit plate in the limit assembly, the movable range of the fixed plate and the closing plate is limited. By controlling the position of the closing plate, the size of the opening at the water outlet is indirectly controlled, and the output speed of the medicine in the liquid storage box is controlled to avoid the medicine output speed being too fast or too slow, which will affect the infusion process of the entire infusion device.

[0019] By setting the limit plate and the limit groove in the limit assembly, the support piece in the liquid storage box is limited synchronously. During the deformation and deflection of the support piece, the outer part of the support piece is limited by the limit groove. During the deflection and displacement of the support piece, it is limited and guided, thereby avoiding misalignment during the activity of the support piece, thereby ensuring the stability of the support piece during work and further improving the function of the limit assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the anti-blood backflow infusion device; Figure 2 It is a partial cross-sectional structural schematic diagram of the liquid storage box; Figure 3 for Figure 2 The enlarged structural diagram at A in the middle; Figure 4 for Figure 2 The enlarged structural diagram at B in the middle; Figure 5 It is a schematic diagram of the local cross-sectional structure of the viscous tube; Figure 6 for Figure 5 The enlarged structural diagram at C in the middle; Figure 7 It is a schematic diagram of the three-dimensional structure of the closing disk and the connecting rod; Figure 8 It is a schematic diagram of the structure of the first state in which the supporting sheet and the closing disk cooperate; Fig. 9 for Figure 8 The enlarged structural diagram at D in the middle; Fig.10 It is a schematic diagram of the structure of the supporting sheet and the closing disk in the second state of cooperation; Fig.11 for Fig.10 The enlarged structural diagram at E in the middle; Fig.12 for Fig.10 The enlarged structural diagram at F in the middle; Fig.13 It is a schematic diagram of the three-dimensional structure of the sealing strip cross section.

[0022] Reference numerals: 1. Infusion set drip pot; 2. Liquid storage box; 3. First guide surface; 4. Rolling groove; 5. Fixed ring; 6. Viscous tube; 7. Support plate; 8. Fixed disk; 9. Second guide surface; 10. Fixed hole; 11. Limiting disk; 12. Limiting groove; 13. Support seat; 14. Through opening; 15. Closing disk; 16. Sealing strip; 17. Viscous strip; 18. First contact surface; 19. Second contact surface; 20. Connecting rod; 21. Positioning ring; 22. Weakened groove; 23. Fixed column; 24. Connecting head; 25. Sealing groove; 26. Third contact surface; 27. Card-joined edge; 28. Avoidance groove; 29. ​​Water outlet.

[0023] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0024] The following is a detailed description of an anti-blood backflow infusion device provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0025] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0026] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0027] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0028] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0029] like Figures 1 to 13 As shown, an embodiment of the present invention provides an anti-backflow infusion device, including an infusion device drip pot 1, a fixing ring 5 is fixedly connected to the infusion device drip pot 1, and a liquid storage box 2 located above the fixing ring 5 is sleeved in the infusion device drip pot 1, an inner wall of the liquid storage box 2 is fixedly connected with evenly distributed support sheets 7, and a water outlet 29 is provided in the middle of the bottom end of the liquid storage box 2, and a second guide surface 9 inclined toward the water outlet 29 is provided at the bottom of the inner wall of the liquid storage box 2, a fixing plate 8 is fixedly connected to one end of the support sheet 7 away from the inner wall of the liquid storage box 2, and a connecting rod 20 is fixedly connected to the lower part of the fixed plate 8, the infusion device drip pot 1 is located at the upper end of the infusion pipeline, and the medicinal liquid flows into the infusion tube through the infusion device drip pot 1, and a certain amount of medicinal liquid can be stored to ensure the continuous supply of medicinal liquid during the infusion process.

[0030] The fixing ring 5 in the drip pot 1 of the infusion device is used to assist the liquid storage box 2 in being fixed in the drip pot 1 of the infusion device, so as to ensure the stability of the liquid storage box 2 during operation. The liquid storage box 2 can store the liquid medicine entering the drip pot 1 of the infusion device, and drive other structures to cooperate with each other through the weight of the accumulated liquid medicine to open the water outlet 29 to ensure the normal progress of the infusion, and after the infusion is completed, the water outlet 29 is closed in time to avoid blood return. The closing plate 15 is used to close the water outlet 29. The closing plate 15 and the supporting sheet 7 in the liquid storage box 2 have two matching states. The first state is that the closing plate 15 is attached to the bottom of the liquid storage box 2 to close the water outlet 29. At this time, the entire infusion pipeline is closed to avoid blood return. The second state is that the closing plate 15 leaves the bottom surface of the liquid storage box 2 and moves downward. At this time, the water outlet 29 is in an open state, and the liquid medicine in the liquid storage box 2 can be infused through the drip pot 1 of the infusion device, so as to ensure the normal operation of the infusion pipeline.

[0031] The bottom end of the connecting rod 20 passes through the water outlet 29 and is fixedly connected to the closing disk 15; the sealing component is used to seal the water outlet 29 after it is closed, and the sealing component is connected to the closing disk 15; the viscous component is used to control the speed of the movable reset of the connecting rod 20, and the viscous component is connected to the liquid storage box 2; the limiting component is used to limit the range of movement of the closing disk 15 and the support sheet 7, and the limiting component is connected to the viscous component. The sealing component can ensure the sealing effect of the water outlet 29 after the closing disk 15 is closed, thereby preventing the liquid medicine in the pipeline below the infusion pot 1 from leaking out of the sealing disk. The blood returns to the liquid storage box 2 through the gap between the closing disk 15 and the bottom of the liquid storage box 2, causing the blood backflow phenomenon, thereby ensuring the anti-blood backflow effect of the entire infusion set. The setting of the viscous component can maintain the closing disk 15 and the supporting plate 7 in the second state for a period of time after the infusion is completed, so that the water outlet 29 is continuously opened for a period of time after the infusion is completed, and the medicine liquid in the liquid storage box 2 is output as much as possible to reduce the residual medicine liquid. The limiting component can limit the range of movement of the structure in the liquid storage box 2 to avoid misalignment when the structures work together, thereby ensuring the stability of the entire liquid storage box 2 during operation.

[0032] In this embodiment, if Figure 1 to Figure 2 as well as Figure 8As shown, an input port is provided in the middle of the top of the liquid storage box 2, and a first guide surface 3 inclined toward the central area of ​​the input port is provided at the top of the liquid storage box 2, and the opening of the input port is bent toward the inner side of the liquid storage box 2, and a roll-up groove 4 is formed between the inner wall of the liquid storage box 2, and the input port of the liquid storage box 2 can allow the medicine entering the drip pot 1 of the infusion device to drip into the liquid storage box 2 for storage, and the first guide surface 3 at the top of the liquid storage box 2 can guide the medicine that does not directly drip into the liquid storage box 2, so that the medicine can slide into the liquid storage box 2 along the guidance of the first guide surface 3, and the design of the roll-up groove 4 can form a certain wrapping on the top of the liquid storage box 2, so as to prevent the medicine dripping into the liquid storage box 2 from splashing out the medicine originally existing in the liquid storage box 2 again, thereby ensuring the retention effect of the medicine in the liquid storage box 2.

[0033] The bottom end of the liquid storage box 2 is fixedly connected with evenly distributed fixing columns 23, and the ends of the fixing columns 23 are fixedly connected with the connecting heads 24. The fixing ring 5 is provided with fixing holes 10 corresponding to the positions of the fixing columns 23 and the connecting heads 24. The diameter of the bottom end of the connecting head 24 is smaller than the diameter of the fixing hole 10, and the diameter of the other end is larger than the diameter of the fixing hole 10, so that the small end of the connecting head 24 can be more easily inserted into the fixing hole 10. The connecting head 24 is made of hard rubber as a whole and has a hollow structure. The material and structure of the connecting head 24 make The connector 24 has a certain deformation ability. When the liquid storage box 2 is installed, the connector 24 can be deformed by squeezing the liquid storage box 2 and pass through the fixing hole 10. The length of the fixing column 23 is the same as the thickness of the fixing ring 5. When the liquid storage box 2 is installed and fixed inside the infusion pot 1, the fixing column 23 is sleeved in the fixing hole 10, and the connector 24 passes through the fixing hole 10 as a whole, and the end of the connector 24 with a larger diameter is in contact with the bottom surface of the fixing ring 5, thereby ensuring the stability of the liquid storage box 2 when assembled and fixed in the infusion pot 1.

[0034] In this embodiment, if Figure 4 and Figure 7 as well as Figure 12 to Figure 13As shown, the sealing assembly includes a sealing strip 16 fixedly connected to the closing disk 15. The sealing strip 16 is located on a surface of the closing disk 15 close to the bottom of the liquid storage box 2. A sealing groove 25 matching the shape of the sealing strip 16 is formed at the bottom end of the liquid storage box 2. The top end of the sealing strip 16 is bent and rolled toward the outside of the closing disk 15 to form a snap-fit ​​edge 27. A third contact surface 26 is provided on one side of the snap-fit ​​edge 27 facing the bottom of the liquid storage box 2. An avoidance groove 28 is provided at the connection between the sealing strip 16 and the snap-fit ​​edge 27, and the sealing strip 16 is a hollow structure as a whole. When the infusion set is infusing normally, the closing disk 15 and the supporting sheet 7 are in the second state. In this state, the closing disk 15 leaves the bottom surface of the liquid storage box 2, and the sealing strip 16 does not work. The liquid medicine in the liquid storage box 2 is discharged through the water outlet 29 after the closing disk 15 is opened. After the infusion is completed, the fixed disk 8 and the closing disk 15 are reset under the elastic force of the supporting sheet 7, and the water outlet 29 is closed again by the closing disk 15. In this process, the sealing strip 16 on the closing disk 15 follows the closing disk 15 to the storage box 2. The sealing strip 16 moves to the sealing groove 25 at the bottom of the liquid box 2. After the sealing strip 16 approaches the bottom surface of the liquid storage box 2, the third contact surface 26 on the sealing strip 16 contacts the bottom surface of the liquid storage box 2 and is subjected to pressure from the bottom surface of the liquid storage box 2, so that the clamping edge 27 on the sealing strip 16 is bent and deformed at the avoidance groove 28 until the sealing strip 16 completely enters the sealing groove 25, allowing the closing plate 15 and the supporting sheet 7 to return to the first state. In this state, the sealing strip 16 is sleeved in the sealing groove 25, and a clamping connection is formed between the clamping edge 27 on the sealing strip 16 and the sealing groove 25, closing the water outlet 29 and filling the gap between the closing plate 15 and the bottom surface of the liquid storage box 2, thereby ensuring the sealing effect of the closing plate 15 on the water outlet 29, and avoiding the possibility of the medicine flowing back into the liquid storage box 2 from the gap, causing the blood return phenomenon.

[0035] In this embodiment, if Figures 2 to 11As shown, the viscous component includes a viscous tube 6 sleeved on the outside of the connecting rod 20, and the bottom end of the viscous tube 6 is connected to the second guide surface 9 through a support seat 13. The support seat 13 is in an inverted trumpet shape, and the outside of the support seat 13 is provided with evenly distributed through openings 14, and the openings of the through openings 14 extend to the outer surface of the second guide surface 9. The design of the second guide surface 9 forms an inclined surface at the water outlet 29 on the bottom surface of the inner side wall of the liquid storage box 2. When the liquid medicine in the liquid storage box 2 is about to be discharged, the residual liquid medicine is guided to the water outlet 29 for discharge. The viscous tube 6 relies on the support seat 13 in the liquid storage box 2. The connection is fixed, and after the medicine entering the liquid storage box 2 accumulates to a certain extent, it will press the closing disk 15 open under the action of its own weight, so that the water outlet 29 is opened. At this time, the medicine accumulated in the liquid storage box 2 can pass through the through opening 14 on the support seat 13 and be discharged through the water outlet 29. The diameter of the water outlet 29 is larger than the diameter of the viscous tube 6. Therefore, the support seat 13 is in an inverted trumpet shape to adapt to the viscous tube 6 and the second guide surface 9. The opening of the through opening 14 extends to the second guide surface 9 to avoid the formation of a groove-like structure between the support seat 13 and the second guide surface 9, which in turn produces residual medicine.

[0036] The viscous tube 6 is sleeved with a plurality of viscous strips 17 evenly distributed from top to bottom, and a positioning ring 21 matching the size of the viscous strip 17 is fixedly connected to the outside of the connecting rod 20, and a first contact surface 18 is provided on the side of the viscous strip 17 away from the support seat 13, and a second contact surface 19 is provided on the side of the viscous strip 17 close to the support seat 13, and the angle between the first contact surface 18 and the inner wall of the viscous tube 6 is greater than the angle between the second contact surface 19 and the inner wall of the viscous tube 6. The viscous strip 17 sleeved in the viscous tube 6 forms a plurality of limiting areas in the viscous tube 6, and there is a certain viscous time when the position of the closing disk 15 is switched between the first state and the second state. For example, when there is no more input of liquid medicine in the infusion pot 1, the liquid medicine in the liquid storage box 2 is no longer replenished, and the residual liquid medicine in the liquid storage box 2 remains The liquid medicine flows out from the water outlet 29. As the liquid medicine flows out, the gravity effect of the liquid medicine on the closed disk 15 gradually decreases, and the positions of the fixed disk 8 and the closed disk 15 are gradually reset under the elastic force of the support sheet 7. During the reset process, the positioning ring 21 on the connecting rod 20 contacts the second contact surface 19 on the sticky strip 17, and is squeezed and limited by the sticky strip 17 to slow down the upward movement speed of the connecting rod 20 and the positioning ring 21, and indirectly slow down the reset speed of the closed disk 15 and the fixed disk 8, so that the residual liquid medicine in the liquid storage box 2 can be fully discharged. Each time it passes through a sticky strip 17, the elastic force of the support sheet 7 is further reduced until the gravity of the liquid medicine in the liquid storage box 2 is further reduced, so that the upward thrust of the elastic force of the support sheet 7 on the fixed disk 8 and the connecting rod 20 is greater than the resistance of the sticky strip 17 to the positioning ring 21, until the support sheet 7 and the closed disk 15 return to the first state.

[0037] In this embodiment, if Figures 2 to 7As shown, the support sheet 7 is Z-shaped, and the two ends of the support sheet 7 are fixedly connected to the inner wall of the liquid storage box 2 and the bottom surface of the fixed plate 8 respectively, and a weakened groove 22 is opened in the middle of the support sheet 7. The thickness values ​​of the two connecting ends of the support sheet 7 are greater than the thickness values ​​of other areas on the support sheet 7. The support sheet 7 is used to support and limit the fixed plate 8 and the connecting rod 20 to ensure the position of the fixed plate 8 and the connecting rod 20 in the liquid storage box 2. At the same time, when the liquid medicine is not accumulated in the liquid storage box 2, the fixed plate 8 is limited by its own elastic force, and the fit between the closing plate 15 and the bottom surface of the liquid storage box 2 is indirectly maintained. The two ends of the support sheet 7 are respectively connected to the inner wall of the liquid storage box 2 and the bottom surface of the fixed disk 8, and the connection end is thickened to ensure the stability of the connection between the support sheet 7 and the fixed disk 8 and the inner wall of the liquid storage box 2. The weakening groove 22 makes the thickness of the support sheet 7 at the weakening groove 22 thinner and weaker, and it is more likely to deform after being acted upon by external force. After the liquid medicine in the liquid storage box 2 accumulates to a certain extent, the gravity of the liquid medicine on the closed disk 15 is greater than the supporting effect of the support sheet 7 on it. At this time, the support sheet 7 will bend and deform in the weakening groove 22, and the closed disk 15 will be displaced. The limiting assembly includes a limiting disk 11 fixedly connected to the top of the viscous tube 6, the limiting disk 11 is parallel to the fixed disk 8, and an inclined surface is arranged at the outer edge of the fixed disk 8, and the diameter of the fixed disk 8 is greater than the diameter of the viscous tube 6.

[0038] The limiting plate 11 is provided with evenly distributed limiting grooves 12, the positions of the limiting grooves 12 correspond to the positions of the supporting sheet 7, and the shapes of the limiting grooves 12 match the shapes of the supporting sheet 7. When the closing plate 15 and the supporting sheet 7 are in the second state, the fixed plate 8 moves with the closing plate 15 under the influence of the transmission effect of the connecting rod 20. At this time, the bottom surface of the fixed plate 8 is in contact with the top of the limiting plate 11, and the limiting plate 11 forms an auxiliary limit for the fixed plate 8, limiting the range of movement of the closing plate 15, and preventing the closing plate 15 from being too far away from the bottom surface of the liquid storage box 2, resulting in the water outlet The opening 29 is too large, causing the medicine in the liquid storage box 2 to flow out too quickly. The position of the limiting groove 12 on the limiting disk 11 corresponds to the support sheet 7, and the shape is adapted to the support sheet 7. When the support sheet 7 follows the displacement of the closing disk 15 to switch between the first state and the second state, the connection between the support sheet 7 and the fixed disk 8 will also deflect following the deformation of the support sheet 7. The setting of the limiting groove 12 can limit the support sheet 7 during the deflection process, thereby avoiding the misalignment of the support sheet 7, and further improving the stability of the structure in the liquid storage box 2 during operation.

[0039] The working principle of the technical solution provided by the present invention is as follows: When in use, first connect the infusion set as a whole to the infusion bottle, the medicine in the infusion bottle enters the infusion set drip pot 1 through the infusion pipe, the medicine drips into the liquid storage box 2, and is stored in the liquid storage box 2. After the medicine in the liquid storage box 2 accumulates to a certain extent, the closing plate 15 is pressed down by the weight of the medicine and moves, and the water outlet 29 is opened. The medicine stored in the liquid storage box 2 passes through the through opening 14 on the support seat 13 and then flows down through the water outlet 29, passes through the infusion set drip pot 1, and is output from the infusion needle after passing through the infusion pipeline. The infusion needle is punctured and inserted into the patient's infusion site to perform infusion for the patient.

[0040] During the downward displacement of the closing disk 15, the fixed disk 8 is driven downward by the transmission of the connecting rod 20, and then the support sheet 7 between the fixed disk 8 and the inner wall of the liquid storage box 2 is compressed, so that the support sheet 7 is bent and deformed at the weakened groove 22. At the same time, the positioning ring 21 on the connecting rod 20 follows the movement of the connecting rod 20 until the support sheet 7 and the closing disk 15 cooperate to present the second state. In this state, the medicine liquid in the liquid storage box 2 is continuously replenished, the closing disk 15 leaves the bottom surface of the liquid storage box 2, and the medicine liquid in the liquid storage box 2 is continuously discharged from the water outlet 29 to ensure the normal infusion of the entire infusion device.

[0041] After the infusion is completed, the medicine in the liquid storage box 2 is no longer replenished. At the same time, the residual medicine in the liquid storage box 2 still flows out from the water outlet 29. The positions of the fixed disk 8 and the closed disk 15 are gradually reset under the elastic force of the support sheet 7. During the reset process, the positioning ring 21 on the connecting rod 20 contacts the second contact surface 19 on the sticky strip 17 and is squeezed and limited by the sticky strip 17 to slow down the upward movement speed of the connecting rod 20 and the positioning ring 21, and indirectly slow down the reset speed of the closed disk 15 and the fixed disk 8, so that the residual medicine in the liquid storage box 2 can be fully discharged.

[0042] After a period of sticking under the action of the viscous strip 17 in the viscous tube 6, the medicine in the liquid storage box 2 is fully discharged, and the positions of the closing disk 15 and the supporting plate 7 are restored to the first state. During this process, the sealing strip 16 on the closing disk 15 moves toward the sealing groove 25 at the bottom of the liquid storage box 2, and the third contact surface 26 on the sealing strip 16 contacts the bottom surface of the liquid storage box 2 and is subjected to pressure from the bottom surface of the liquid storage box 2, so that the clamping edge 27 on the sealing strip 16 is bent and deformed at the avoidance groove 28 until the sealing strip 16 completely enters the sealing groove 25. At this time, the closing disk 15 and the supporting plate 7 are restored to the first state, and the sealing strip 16 is sleeved in the sealing groove 25. The clamping edge 27 on the sealing strip 16 is clamped with the sealing groove 25 to close the water outlet 29, thereby avoiding the generation of negative pressure in the infusion pot 1 and causing blood return after the infusion is completed, completing the working process of the entire anti-blood return infusion device.

[0043] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An anti-blood backflow infusion device, characterized in that: The invention comprises an infusion device drip pot, wherein a fixing ring is fixedly connected in the infusion device drip pot, and a liquid storage box located above the fixing ring is sleeved in the infusion device drip pot, and uniformly distributed support sheets are fixedly connected to the inner side wall of the liquid storage box, and a water outlet is provided in the middle of the bottom end of the liquid storage box, and a second guide surface inclined toward the water outlet is provided at the bottom of the inner wall of the liquid storage box, and a fixing plate is fixedly connected to one end of the support sheet away from the inner side wall of the liquid storage box, and a connecting rod is fixedly connected below the fixing plate, and the bottom end of the connecting rod passes through the water outlet and is fixedly connected to a closing plate; A sealing assembly, used for sealing the water outlet after closing, the sealing assembly being connected to the closing disk; A viscous component, used for controlling the speed of the movable reset of the connecting rod, the viscous component is connected to the liquid storage box; The limiting component is used to limit the range of movement of the closing disk and the supporting plate, and the limiting component is connected to the viscous component.

2. The anti-blood-backflow infusion device according to claim 1, characterized in that: An input port is provided in the middle of the top of the liquid storage box, and a first guide surface inclined toward the central area of ​​the input port is provided at the top of the liquid storage box. The opening of the input port is bent toward the inside of the liquid storage box and forms a rolling groove between the input port and the inner wall of the liquid storage box.

3. The anti-blood-back infusion device according to claim 1, characterized in that: The bottom end of the liquid storage box is fixedly connected with evenly distributed fixing columns, the ends of the fixing columns are fixedly connected with connectors, and the fixing ring is provided with fixing holes corresponding to the positions of the fixing columns and the connectors.

4. The anti-blood-backflow infusion device according to claim 1, characterized in that: The sealing assembly comprises a sealing strip fixedly connected to the closing disk, the sealing strip is located on a surface of the closing disk close to the bottom of the liquid storage box, and a sealing groove matching the shape of the sealing strip is formed at the bottom end of the liquid storage box.

5. The anti-blood-backflow infusion device according to claim 4, characterized in that: The top end of the sealing strip is bent and rolled toward the outside of the closing disk to form a snap-fit ​​edge, a third contact surface is provided on a side of the snap-fit ​​edge facing the bottom of the liquid storage box, an avoidance groove is provided at the connection between the sealing strip and the snap-fit ​​edge, and the sealing strip is a hollow structure as a whole.

6. The anti-blood-back infusion device according to claim 5, characterized in that: The viscous component includes a viscous tube sleeved on the outside of the connecting rod, the bottom end of the viscous tube is connected to the second guide surface via a support seat, the support seat is in an inverted trumpet shape, and the outside of the support seat is provided with evenly distributed through openings, and the openings of the through openings extend to the outer surface of the second guide surface.

7. The anti-blood-backflow infusion device according to claim 6, characterized in that: The viscous tube is sleeved with a plurality of viscous strips evenly distributed from top to bottom, the outside of the connecting rod is fixedly connected with a positioning ring matched with the size of the viscous strip, a first contact surface is provided on a side of the viscous strip away from the support seat, and a second contact surface is provided on a side of the viscous strip close to the support seat, and the angle between the first contact surface and the inner wall of the viscous tube is greater than the angle between the second contact surface and the inner wall of the viscous tube.

8. The anti-blood-backflow infusion device according to claim 7, characterized in that: The support sheet is Z-shaped, and the two ends of the support sheet are fixedly connected to the inner wall of the liquid storage box and the bottom surface of the fixed plate respectively, and a weakening groove is opened in the middle of the support sheet, and the thickness values ​​of the two connecting ends of the support sheet are greater than the thickness values ​​of other areas on the support sheet.

9. The anti-blood-backflow infusion device according to claim 8, characterized in that: The limiting assembly includes a limiting plate fixedly connected to the top end of the viscous tube, the limiting plate is parallel to the fixed plate, an inclined surface is arranged at the outer edge of the fixed plate, and the diameter of the fixed plate is greater than the diameter of the viscous tube.

10. The anti-blood-backflow infusion device according to claim 9, characterized in that: The limiting plate is provided with evenly distributed limiting grooves, the positions of the limiting grooves correspond to the positions of the supporting plates, and the shapes of the limiting grooves match the shapes of the supporting plates.

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