Automatic positive pressure pipe sealing device and pipe flushing device

Abstract

The application discloses an automatic positive pressure pipe sealing device and a pipe flushing device in the technical field of medical auxiliary devices. The automatic positive pressure pipe sealing device comprises a liquid supply assembly, a transmission assembly and an elastic energy storage assembly. The liquid supply assembly comprises a liquid storage pipe and a piston rod. The elastic energy storage assembly is in transmission connection with the transmission assembly. The transmission assembly is in transmission connection with the piston rod in the liquid storage pipe. The piston rod moves relative to the liquid storage pipe in a first preset direction, so that the liquid in the liquid storage space is discharged from a liquid outlet to the venous catheter to seal the pipe. The elastic energy storage assembly is used for converting mechanical energy into elastic potential energy and is in transmission connection with the transmission assembly. The piston rod can automatically move relative to the liquid storage pipe without manually continuously applying force to push the piston rod, so that the purpose of automatically operating the pipe sealing is achieved. The operation is simple, and the positive pressure state of the liquid pressure in the venous catheter relative to the liquid pressure in the human body vessel can be maintained for a long time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical auxiliary devices, and particularly relates to an automatic positive pressure tube sealing device and a tube flushing device. BACKGROUND

[0002] In clinical medical work, intravenous infusion is a common means for delivering liquid medicine to the human body. During the infusion process, when the infusion is completed, blood may flow back into the venous catheter, forming a thrombus to block the venous catheter. Therefore, nurses need to perform a tube flushing and sealing operation, which includes tube flushing and tube sealing. The tube flushing is to inject normal saline into the venous catheter to flush the inside of the venous catheter with normal saline; the tube sealing is to inject a certain amount of solution into the venous catheter to form a positive pressure liquid environment relative to the human body blood pressure, so as to prevent the human body blood from flowing back into the venous catheter to form a thrombus to block the venous catheter after the infusion is completed.

[0003] Some patients need long-term intravenous infusion, and after each infusion is completed, the tube sealing operation needs to be performed to prevent blood from flowing back, so as to prepare for the next intravenous infusion. However, under the existing tube sealing operation conditions, it is difficult to maintain the internal liquid pressure of the venous catheter to be higher than the human body blood pressure for a long time. When the interval time between two intravenous infusions is long, blood is still likely to flow back into the venous catheter. Therefore, professional medical staff needs to perform the tube sealing operation frequently to prevent blood from flowing back into the catheter lumen to form a thrombus. After the blood flows back into the venous catheter lumen to form a thrombus, thrombolysis and catheterization or replacement of the venous catheter need to be performed. This causes a great work pressure on the medical staff and increases the discomfort of the patient during the infusion process. SUMMARY

[0004] The purpose of the present application is to disclose an automatic positive pressure tube sealing device, which can automatically perform the tube sealing operation on the venous catheter to maintain the positive pressure state of the venous catheter relative to the human body blood pressure during the infusion interval, thereby reducing the workload of the medical staff and providing convenience for the patient.

[0005] In order to achieve the above-mentioned purpose, the present application discloses an automatic positive pressure tube sealing device, which comprises a liquid supply assembly, a piston rod and a transmission assembly. The liquid supply assembly comprises a liquid storage pipe and a liquid storage space and a liquid outlet connected with each other. The liquid outlet is used to connect with a venous catheter connected with a human body blood vessel.

[0006] The piston rod is at least partially arranged in the liquid storage space and can move relative to the liquid storage pipe along a first preset direction. The liquid storage space between the piston rod and the liquid outlet is used to store liquid. The first preset direction is the direction of the piston rod towards the liquid outlet.

[0007] The transmission assembly is transmissionally connected with the piston rod and is used to move the piston rod relative to the liquid storage pipe along the first preset direction.

[0008] An elastic energy storage assembly is drivingly connected to the transmission assembly and is used to convert mechanical energy into elastic potential energy so as to drive the transmission assembly to move the piston rod automatically.

[0009] As an optional implementation, the transmission assembly comprises a driving gear and a driven gear, the driving gear is drivingly connected to the elastic energy storage assembly and the driven gear respectively, a rack is arranged on the piston rod and is parallel to the first preset direction, and the rack is engaged with the driven gear.

[0010] As an optional implementation, the elastic energy storage assembly comprises a fixed shell, a coil spring and a rotating shaft, the coil spring is positioned in the fixed shell, an end of an inner ring of the coil spring is provided with a rotating cylinder, the coil spring is contracted to store energy when the rotating cylinder rotates along a second preset direction, the rotating shaft is arranged in the fixed shell, and two ends of the rotating shaft are coaxially connected with the driving gear and the rotating cylinder respectively so as to convert the elastic potential energy of the coil spring into the rotational kinetic energy of the driving gear.

[0011] As an optional implementation, one end of the rotating shaft close to the rotating cylinder is provided with a first ratchet, and a plurality of first clamping teeth are distributed on the inner wall of the rotating cylinder in the circumferential direction, the first clamping teeth are clamped with the first ratchet so that the rotating cylinder cannot drive the rotating shaft to rotate along the second preset direction when the rotating cylinder rotates along the second preset direction, and the rotating cylinder drives the rotating shaft to rotate in the direction opposite to the second preset direction when the coil spring releases the elastic potential energy.

[0012] As an optional implementation, the elastic energy storage assembly further comprises a plurality of sliding rollers, the sliding rollers are distributed between different layers of the coil spring at intervals and are arranged in sequence from the inner ring to the outer ring of the coil spring, and the sliding rollers are in rolling contact with the coil spring.

[0013] As an optional implementation, the cross section of the coil spring comprises an outer side surface, the outer side surface is provided with a convex part, the convex part is in rolling contact with the sliding roller, and the convex part is provided with an oil groove for storing lubricating oil to form an oil film on the outer side surface.

[0014] As an optional implementation, the piston rod is provided with second ratchets, the second ratchets are distributed on the piston rod along the first preset direction, the inner wall of the liquid storage pipe is provided with second clamping teeth, the second ratchets are clamped with the second clamping teeth, and the piston rod is unidirectionally moved along the first preset direction; the second ratchets are provided with not less than two scale ports, the plurality of scale ports are uniformly distributed along the first preset direction, the piston rod is provided with a first scale value corresponding to the position of the scale port, and the first scale value is used to indicate the moving distance of the piston rod.

[0015] As an optional implementation, the application further comprises a liquid distribution assembly, the liquid distribution assembly comprises a first connector, a second connector and a third connector; the first connector is used for connecting an external liquid source, the second connector is used for connecting the liquid supply assembly, and the third connector is used for connecting the intravenous catheter; the liquid distribution assembly is used for controlling the opening and closing of the liquid path between the intravenous catheter and the liquid supply assembly or the external liquid source.

[0016] As an optional implementation, the liquid distribution assembly comprises a three-way valve, the three-way valve is connected with the first connector, the second connector and the third connector respectively; the three-way valve is provided with a switch, and the switch is used for controlling the opening and closing of the liquid path between the liquid supply assembly and the intravenous catheter or the liquid path between the external liquid source and the intravenous catheter.

[0017] As an optional implementation, the liquid distribution assembly comprises a bifurcated pipe, the bifurcated pipe comprises a main pipe and a branch pipe; the two ends of the main pipe are provided with the first connector and the third connector; one end of the branch pipe is connected with the second connector, and the other end is connected with the main pipe; the branch pipe is provided with a first pipe clamp, and the first pipe clamp is used for controlling the opening and closing of the liquid path between the liquid supply assembly and the intravenous catheter; the side of the main pipe close to the first connector is provided with a second pipe clamp, and the second pipe clamp is used for controlling the opening and closing of the liquid path between the external liquid source and the intravenous catheter.

[0018] In another aspect, the application discloses a pipe flushing device, comprising the automatic positive pressure pipe sealing device, the driven gear of the automatic positive pressure pipe sealing device is a non-complete gear, the non-complete gear is intermittently engaged with the rack according to a preset frequency, and the piston rod is intermittently moved along the first preset direction relative to the liquid storage pipe according to the preset frequency.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] (1) The automatic positive pressure tube sealing device comprises a liquid supply assembly, a transmission assembly and an elastic energy storage assembly. The liquid supply assembly comprises a liquid storage tube and a piston rod. The elastic energy storage assembly is in transmission connection with the transmission assembly. The transmission assembly is in transmission connection with the piston rod in the liquid storage tube, so that the piston rod moves relative to the liquid storage tube along a first preset direction, the liquid in the liquid storage space is discharged from a liquid outlet, and the liquid in the liquid storage tube is delivered into the intravenous catheter for tube sealing. During a long infusion interval, the intravenous catheter can also be kept in a positive pressure state relative to the human body blood vessel, effectively improving the operation efficiency of tube sealing and reducing the labor intensity of medical staff.

[0021] (2) The patient only needs to operate the elastic energy storage assembly to convert the mechanical energy of human force into elastic potential energy, so as to reserve the elastic potential energy for automatic operation of tube sealing. The elastic energy storage assembly is in transmission connection with the transmission assembly, so that the plug rod can automatically move relative to the liquid storage tube, without the need of manually continuously applying force to push the piston rod, so as to achieve the purpose of automatic operation of tube sealing. No other steps are needed, which is beneficial to popularization of tube sealing technology. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a sectional view of the automatic positive pressure tube sealing device of the present application;

[0024] Figure 2 is an enlarged view of A in Figure 1

[0025] Figure 3 is a structural view of the elastic energy storage assembly of the present application;

[0026] Figure 4 is an enlarged view of B in Figure 3

[0027] Figure 5 is a sectional view of the rotating shaft and the rotating cylinder of the present application;

[0028] Figure 6 is a structural view of the automatic positive pressure tube sealing device of the present application;

[0029] Figure 7 is an enlarged view of C in Figure 6

[0030] Figure 8 is a schematic view of the piston rod of the present application;

[0031] ​​​Figure 9 is Figure 8 is an enlarged view of E in FIG. 1;

[0032] Figure 10 is a sectional view of the cross section of the coil spring of the present application;

[0033] Figure 11 is Figure 10 is an enlarged view of D in FIG. 2;

[0034] Figure 12 is a structural view of the sliding roller of the present application;

[0035] Figure 13 is a first structural view of the punch pipe sealing device of the present application;

[0036] Figure 14 is a second structural view of the punch pipe sealing device of the present application.

[0037] Explanation of Major Reference Numerals:

[0038] 1. Liquid supply assembly; 11. Liquid storage pipe; 111. Liquid storage space; 112. Liquid outlet; 113. Second clamping tooth; 12. Piston rod; 121. Rack; 122. Second ratchet; 123. Scale opening; 124. First scale value;

[0039] 2. Transmission assembly; 21. Driven gear; 22. Driving gear; 23. Idler gear;

[0040] 3. Elastic energy storage assembly; 31. Fixed shell; 32. Coil spring; 321. Rotating cylinder; 322. First clamping tooth; 323. Outer side surface; 324. Oil groove; 325. Convex part; 326. Oil film; 327. Knob; 3271. Indicating part; 328. Dial; 329. Second scale value;

[0041] 33. Rotating shaft; 331. Spline; 332. First ratchet; 34. Sliding roller; 341. Roller body; 342. Slider; 35. Slide groove;

[0042] 4. Liquid distribution assembly; 41. First connector; 42. Second connector; 43. Third connector; 44. Three-way valve; 45. Branch pipe; 451. Main pipe; 4511. Second pipe clamp; 452. Branch pipe; 4521. First pipe clamp;

[0043] 5. Intravenous catheter;

[0044] F1. First preset direction; F2. Second preset direction. DETAILED DESCRIPTION

[0045] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0046] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to necessarily include a specific orientation, or to be constructed and operated in a specific orientation.

[0047] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For a person of ordinary skill in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0048] In addition, the terms "mount", "set", "provided with", "connect", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or components. For a person of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0049] In addition, the terms "first", "second", and the like are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "multiple" is two or more.

[0050] The technical solutions of the present application will be further described below in combination with the embodiments and the drawings.

[0051] Please refer to Figure 1As shown, the embodiment of the present application provides an automatic positive pressure tube sealing device, which comprises a liquid supply assembly 1, a transmission assembly 2 and an elastic energy storage assembly 3. The liquid supply assembly 1 is used to provide liquid for sealing the tube. The transmission assembly 2 is in transmission connection with the liquid supply assembly 1 and is used to directly drive the liquid for sealing the tube to be discharged from the liquid supply assembly 1 to the venous catheter 5 in communication with the human body vessel. The elastic energy storage assembly 3 is used to convert mechanical energy into elastic potential energy and store the elastic potential energy to continuously provide power to the transmission assembly 2.

[0052] The liquid supply assembly comprises a liquid storage tube 11 and a piston rod 12. The liquid storage tube 11 is provided with a liquid storage space 111 and a liquid outlet 112 in communication with each other. The liquid outlet 112 is used to communicate with the venous catheter 5 in communication with the human body vessel. At least a part of the piston rod 12 is arranged in the liquid storage space 111 and can move relative to the liquid storage tube 11 along a first preset direction F1. The liquid storage space 111 between the piston rod 12 and the liquid outlet 112 is used to store liquid. The first preset direction F1 is the direction of the piston rod 12 towards the liquid outlet 112.

[0053] The transmission assembly 2 is in transmission connection with the piston rod 12 and is used to move the piston rod 12 relative to the liquid storage tube 11 along the first preset direction F1. The elastic energy storage assembly 3 is in transmission connection with the transmission assembly 2 and is used to convert mechanical energy into elastic potential energy to automatically drive the transmission assembly 2 to move the piston rod 12.

[0054] The elastic energy storage assembly 3 is in transmission connection with the transmission assembly 2, and the transmission assembly 2 is in transmission connection with the piston rod 12 in the liquid storage tube 11 to move the piston rod 12 relative to the liquid storage tube 11 along the first preset direction F1, so that the liquid in the liquid storage space 111 is discharged from the liquid outlet 112 to the venous catheter 5 in a pulse manner.

[0055] The elastic energy storage assembly 3 is used to convert mechanical energy into elastic potential energy and is in transmission connection with the transmission assembly 2, so that the piston rod can automatically move relative to the liquid storage tube 11 without the need for manual continuous force to push the piston rod 12, so as to achieve the purpose of automatic operation of sealing the tube. Even during a long infusion interval, the venous catheter 5 can also maintain a positive pressure state relative to the human body vessel, effectively improving the operation efficiency of sealing the tube and reducing the labor intensity of medical staff.

[0056] The patient or medical staff only needs to operate the elastic energy storage assembly 3 to convert the mechanical energy of human power into elastic potential energy to reserve the elastic potential energy for automatic operation of sealing the tube. No other steps are needed for sealing tube operation. It is convenient for the patient or medical staff to operate and is beneficial to popularize the tube sealing technology.

[0057] In some embodiments, the transmission assembly 2 comprises a driving gear 22 and a driven gear 21, the driving gear 22 is drivingly connected to the elastic energy storage assembly 3 and the driven gear 21 respectively, the piston rod 12 is provided with a rack 121, the rack 121 is parallel to the first preset direction F1, and the rack 121 is engaged with the driven gear 21.

[0058] The driving gear 22 is drivingly connected to the elastic energy storage assembly 3 and the driven gear 21 respectively, and the elastic potential energy released by the elastic energy storage assembly 3 is transmitted through the driving gear 22. Through the engagement of the driven gear 21 and the piston rod 12, the elastic potential energy of the elastic energy storage assembly 3 can be stably transmitted to the rack 121, and then the piston rod 12 is pushed to move along the preset direction F1, so as to realize the automatic sealing tube operation.

[0059] In some embodiments, the driving gear 22 and the driven gear 21 are provided with an idler gear 23, and the idler gear 23 is engaged with the driving gear 22 and the driven gear 21.

[0060] When the original installation position of the driving gear 22 and the driven gear 21 cannot meet the center distance requirement of direct engagement due to space limitation, the idler gear 23 can be used as an intermediate transition piece. By adjusting the installation position of the idler gear 23, the distance between the two gears can be flexibly adapted, avoiding the engagement failure caused by the mismatch of the center distance. Multiple gear engagement disperses the load of each gear, reduces the wear rate of the gear surface, and prolongs the service life of the transmission assembly 2.

[0061] Please refer to Figures 3-4 In some embodiments, the elastic energy storage assembly 3 comprises a fixed shell 31, a coil spring 32 and a rotating shaft 33. The coil spring 32 is positioned in the fixed shell 31, and the end of the inner circle of the coil spring 32 is provided with a rotating cylinder 321. When the rotating cylinder 321 rotates along the second preset direction F2, the coil spring 32 will contract and store energy. The rotating shaft 33 is arranged in the fixed shell 31, and the two ends of the rotating shaft 33 are coaxially connected with the driving gear 22 and the rotating cylinder 321 respectively, so as to convert the elastic potential energy of the coil spring 32 into the rotational kinetic energy of the driving gear 22.

[0062] The coil spring 32 is positioned in the fixed shell 31, and when the rotating cylinder 321 rotates along the second preset direction F2, the coil spring 32 will contract and store energy. The mechanical energy generated by artificial operation is effectively converted into the elastic potential energy of the coil spring 32 and stored. Before the sealing tube operation, the patient or medical staff only needs to rotate the rotating cylinder 321 to easily store energy for the subsequent sealing tube operation, without the need for complex skills or professional knowledge, which reduces the operation threshold and is convenient for patients to operate by themselves, which is conducive to the application and promotion of the sealing tube technology in a wider population.

[0063] In some embodiments, the rotating shaft 33 is arranged in the fixed shell 31, and a spline 331 is arranged at one end of the rotating shaft 33 close to the driving gear 22, and the spline 331 is used to fix the rotating shaft 33 and the driving gear 22 in the circumferential direction. The other end of the rotating shaft 33 is fixedly connected with the rotating drum 321. When it is needed to release the energy for the pipe sealing operation, the elastic potential energy stored by the coil spring 32 can be accurately converted into the rotational kinetic energy of the driving gear 22 through the rotating shaft 33. This energy conversion mode is direct and efficient, reduces the loss of energy in the transmission process, and ensures that the elastic potential energy can effectively drive the transmission assembly 2 to drive the piston rod 12 to move along the first preset direction F1 at a certain frequency, thereby achieving the technical effect of automatic pipe sealing.

[0064] Referring to Figure 4 In some embodiments, the elastic energy storage assembly 3 further comprises a plurality of sliding rollers 34, which are arranged between different coil layers of the coil spring 32 and arranged in sequence along the coil spring 32 from the inner coil to the outer coil, and the sliding rollers 34 are in rolling contact with the coil spring 32. The fixed shell 31 is provided with a sliding groove 35 extending along the coil spring 32 from the inner coil to the outer coil, and the sliding rollers 34 are in sliding connection with the sliding groove 35.

[0065] In the process of accumulating the elastic potential energy by the coil spring 32, the degree of deformation of the inner coil of the coil spring 32 is larger than that of the outer coil of the coil spring 32. Therefore, in the process of releasing the elastic potential energy by the elastic recovery of the coil spring 32, the inner coil layer and the outer coil layer of the coil spring 32 are prone to sliding friction, which consumes the elastic potential energy of the coil spring 32 on the one hand, and causes the process of releasing the elastic potential energy of the coil spring 32 to be unstable on the other hand, thereby causing the transmission process of the transmission assembly 2 to be unstable, the moving frequency of the piston rod 12 to change too much, and it is difficult to implement a stable pipe sealing process.

[0066] The plurality of sliding rollers 34 are arranged between different coil layers of the coil spring 32 to reduce the frictional contact between different coil layers of the coil spring 32, and the rolling friction between the sliding rollers 34 and the coil spring 32 is used to reduce the elastic potential energy consumed by friction. The sliding groove 35 provides a fixed track for the movement of the sliding rollers 34, so that the coil layers of the coil spring 32 can normally and orderly contract and expand within a certain range, and the normal working state of the contraction and storage of the coil spring 32 and the expansion and release capacity is maintained.

[0067] Referring to Figures 5-7In some embodiments, a portion of the rotating drum 321 penetrates the fixed shell 31, and the end of the rotating drum 321 penetrating the fixed shell 31 is provided with a knob 327. The knob 327 is used to manually apply torque to the rotating drum 321 outside the fixed shell 31 to achieve the contraction of the coil spring 32 for energy storage. The outer peripheral portion of the knob 327 is provided with a dial 328, and the dial 328 is circumferentially provided with second scale values 329 uniformly distributed around the knob 327. The knob 327 is provided with an indicating portion 3271 circumferentially fixed relative to the knob 327. The rotation angle of the knob 327 is indicated by the cooperation of the indicating portion 3271 and the second scale.

[0068] Different patients or different catheterization requirements may have different energy requirements. By accurately controlling the rotation angle of the knob 327, the user can reserve an appropriate amount of elastic potential energy according to the actual situation to meet the individualized catheterization operation requirements. During the energy storage process of the coil spring 32, the rotation angle is closely related to the degree of contraction of the coil spring 32 and the stored elastic potential energy. The user accurately controls the rotation angle of the knob 327 according to the scale on the dial 328 and the position of the indicating portion 3271, thereby achieving precise control of the energy storage of the coil spring 32.

[0069] Please refer to Figure 5 In some embodiments, the rotating shaft 33 is provided with a first ratchet 332 near one end of the rotating drum 321, and the inner wall of the rotating drum 321 is circumferentially provided with a first tooth 322. The first tooth 322 and the first ratchet 332 are engaged so that when the rotating drum 321 rotates in the second predetermined direction F2, the rotating drum 321 will not drive the rotating shaft 33 to rotate in the second predetermined direction F2. When the coil spring 32 releases the elastic potential energy, the rotating drum 321 drives the rotating shaft 33 to rotate in the direction opposite to the second predetermined direction F2.

[0070] When the rotating drum 321 rotates in the second predetermined direction F2 to achieve the contraction of the coil spring 32 for energy storage, the first tooth 322 and the first ratchet 332 are engaged so that the rotation of the rotating drum 321 will not drive the rotating shaft 33 to rotate in the second predetermined direction F2. This means that during the process of the user rotating the knob 327 to rotate the rotating drum 321 to compress the coil spring 32 to store elastic potential energy, the rotating shaft 33 will not rotate in the direction opposite to the second predetermined direction F2, preventing the transmission assembly 2 from driving the piston rod 12 to move in the direction opposite to the first predetermined direction F1, ensuring the one-way movement of the piston rod 12 in the first predetermined direction F1. Preventing the piston rod 12 from moving in the opposite direction to cause the gas or liquid outside the liquid supply assembly 1 to flow back into the liquid storage pipe 11. In order to prevent the contact and friction between the rotating drum 321 and the rotating shaft 33 from driving the rotating shaft 33 to rotate in the second predetermined direction F2 when the knob 327 is rotated in the second predetermined direction F2, the part of the piston rod 12 outside the liquid storage pipe 11 needs to be manually resisted during the energy storage stage of the coil spring 32 to lock the piston rod 12 and the transmission assembly 2.

[0071] Please see Figures 8-9 As shown, in some embodiments, the piston rod 12 is provided with a second ratchet 122, which is distributed along a first preset direction F1 on the piston rod 12. The inner wall of the liquid storage tube 11 is provided with a second locking tooth 113, which engages with the second ratchet 122 and the second locking tooth 113, so that the piston rod 12 moves unidirectionally along the first preset direction F1. The second ratchet 122 is provided with no less than two scale openings 123, which are evenly distributed along the first preset direction F1. The piston rod 12 is provided with a first scale value 124 corresponding to the scale opening 123, which is used to indicate the moving distance of the piston rod 12.

[0072] The second ratchet 122 is distributed along the first preset direction F1 on the piston rod 12. The second locking tooth 113 on the inner wall of the liquid storage tube 11 engages with the second ratchet 122, so that the piston rod 12 can only move in one direction along the first preset direction F1. The liquid in the liquid storage space 111 can be pushed out in the predetermined direction, maintaining a stable liquid delivery process. Through the cooperation of the second ratchet 122 and the second locking tooth 113, the contact friction between the rotating shaft 33 and the drum during the energy storage stage of the coil spring 32 by manually operating the knob 327 can be prevented from causing the rotating shaft 33 to rotate along the second preset direction F2. When the knob 327 is not manually operated, it is not necessary to press against the piston rod 12, which reduces the difficulty of manual operation and reduces the risk of the piston rod 12 moving in the opposite direction. By observing the first scale value 124, medical staff or patients can accurately and directly observe the movement of the piston rod 12 and understand the progress of the entire automated sealing process, so that users can adjust the automatic positive pressure sealing device in a timely manner.

[0073] Please see Figures 10-11 As shown, in some embodiments, the cross-section of the coil spring 32 includes an outer side surface 323, the outer side surface 323 is provided with a protrusion 325, the protrusion 325 is in rolling contact with the sliding roller 34; the protrusion 325 is provided with an oil groove 324, the oil groove 324 is used to store lubricating oil to form an oil film 326 on the outer side surface 323.

[0074] The sliding roller 34 makes rolling contact with the protrusion 325, which reduces the frictional contact area between the sliding roller 34 and the coil spring 32, making the rotation of the sliding roller 34 relative to the coil spring 32 smoother and helping to reduce the frictional loss of elastic potential energy.

[0075] The oil film 326 plays a role of buffering and lubrication between the convex part 325 and the sliding roller 34, which is conducive to reducing the wear caused by friction between the two. With the increase of use time, the oil film 326 can also gradually evaporate and disappear. A certain amount of lubricating oil is stored in the oil groove 324, and under the action of the tension of the lubricating oil itself, the lubricating oil in the oil groove 324 can be supplemented to the oil film 326 to realize a complete oil film 326 state for a long time, improve the lubricating effect of the oil film 326, and increase the service life of the sliding roller 34 and the coil spring 32.

[0076] Please refer to Figure 10 and Figure 12 In some embodiments, the sliding roller 34 includes a roller body 341 and a sliding block 342, the sliding block 342 is provided with a rotating shaft, the roller body 341 is arranged on the rotating shaft, and the roller body 341 is rotationally connected to the sliding block 342 through the rotating shaft; when the roller body 341 is in rolling contact with the coil spring 32, the roller body 341 rotates relative to the sliding block 342. The sliding block 342 is embedded in the sliding groove 35, and the sliding block 342 is in sliding connection with the sliding groove 35. When the sliding block 342 moves along the sliding groove 35, the roller body 341 moves together with the sliding block 342. The distance from the outer side surface 323 of the roller body 341 in contact with the coil spring 32 to the edge of the sliding block 342 is S, the maximum layer thickness of the coil spring 32 is H, and the diameter of the roller body 341 is D, and the three satisfy the numerical relationship of D / 2

[0077] When the size of the sliding block 342 is too large, the distance between adjacent roller bodies 341 is greater than the layer thickness of the coil spring 32, that is, there is a gap between the roller body 341 and the coil spring 32 in the contracted state of the coil spring 32, which is not conducive to fully exerting the ability of the coil spring 32 to accumulate elastic potential energy. When the roller body 341 is in contact with the coil spring 32, the roller body 341 is subjected to a radial torque. If the size of the sliding block 342 is too small, the center of gravity of the sliding roller 34 is concentrated on the roller body 341, and when the sliding block 342 moves along the sliding groove 35, it is easy to be stuck due to uneven force.

[0078] S>D / 2, that is, the distance from the edge of the sliding block 342 to the outer side surface 323 of the roller body 341 is greater than half the radius of the roller body 341, which is conducive to reducing the center of gravity of the sliding roller 34 to the sliding block 342 and improving the smoothness of the sliding connection between the sliding roller 34 and the sliding groove 35. S

[0079] In some embodiments, the automatic positive pressure sealing device further comprises a liquid distribution assembly 4. The liquid distribution assembly 4 comprises a first joint 41, a second joint 42, and a third joint 43. The first joint 41 is used to communicate with an external liquid source, the second joint 42 is used to communicate with the liquid supply assembly 1, and the third joint 43 is used to communicate with the venous catheter 5; the liquid distribution assembly 4 is used to control the opening and closing of the liquid path between the venous catheter 5 and the liquid supply assembly 1 or the external liquid source.

[0080] The liquid distribution assembly 4 integrates the three core components of the external liquid source, the liquid supply assembly 1, and the venous catheter 5 in the same device through the first joint 41, the second joint 42, and the third joint 43, forming a complete liquid delivery closed loop. Medical personnel or patients only need to operate the liquid distribution assembly 4 to control the flow of the external liquid source into the venous catheter 5 or inject liquid from the liquid supply assembly 1 into the venous catheter 5 for sealing, avoiding the cumbersome operation of frequently disassembling the pipeline or switching devices in traditional split devices, and significantly improving the convenience of use.

[0081] During the sealing process, the liquid supply assembly 1 is connected through the second joint 42 and the external liquid source is blocked, ensuring that only the liquid for sealing is delivered from the liquid supply assembly 1 to the venous catheter 5; while during regular infusion, the external liquid source such as normal saline, disinfectant, drug solution, etc. is connected through the first joint 41 and the liquid supply assembly 1 is blocked, avoiding mutual interference.

[0082] In some embodiments, please refer to Figure 13 As shown in the first structure diagram of the automatic positive pressure sealing device, the liquid distribution assembly 4 comprises a three-way valve 44, which is in communication with the first joint 41, the second joint 42, and the third joint 43 respectively; the three-way valve 44 is provided with a switch, which is used to control the opening and closing of the liquid path between the liquid supply assembly 1 and the venous catheter 5, or the liquid path between the external liquid source and the venous catheter 5.

[0083] The three-way valve 44 is a valve with three ports, which are respectively connected to the first joint 41 connected to the external liquid source, the second joint 42 connected to the liquid supply assembly 1, and the third joint 43 connected to the venous catheter 5. The three-way valve 44 has a movable valve core inside, and the position of the valve core determines the communication relationship between different ports. By changing the position of the valve core, the conduction or blockage between different ports can be achieved, thereby controlling the flow direction and path of the liquid.

[0084] When the switch is in a specific position, the valve core of the three-way valve 44 moves, so that the second joint 42 and the third joint 43 are connected, and the pipeline between the first joint 41 and the second joint 42 is blocked. At this time, the liquid in the liquid supply assembly 1 flows to the venous catheter 5 through the second joint 42, the internal channel of the three-way valve 44, and the third joint 43, realizing the sealing operation.

[0085] When the switch is switched to another position, the spool moves to change the communication of the internal passage, so that the communication between the second joint 42 and the third joint 43 is blocked. In this way, the liquid in the liquid supply assembly 1 cannot flow to the venous catheter 5, and the sealing operation is suspended. This precise control can ensure that there is no liquid from the liquid supply assembly 1 into the venous catheter 5 when sealing is not needed.

[0086] During the control of the on-off of the liquid path, the three-way valve 44 can ensure the independence between different liquid paths. When the liquid path of the liquid supply assembly 1 is communicated with the venous catheter 5, the liquid path of the external liquid source and the venous catheter 5 is blocked, and vice versa. This independence can avoid the mixing of two different sources of liquid, prevent the problems of drug efficacy change, adverse reactions and other problems caused by liquid mixing, and ensure the safety and effectiveness of liquid delivery.

[0087] In some embodiments, please refer to Figure 14 As shown, a second structural diagram of the automatic positive pressure sealing device is shown, the distribution assembly 4 includes a bifurcated pipe 45, the bifurcated pipe 45 includes a main pipe 451 and a branch pipe 452; the two ends of the main pipe 451 are provided with the first joint 41 and the third joint 43; one end of the branch pipe 452 is communicated with the second joint 42, and the other end is communicated with the main pipe 451; the branch pipe 452 is provided with a first pipe clamp 4521, and the first pipe clamp 4521 is used to control the on-off of the liquid path between the liquid supply assembly 1 and the venous catheter 5; the side of the main pipe 451 close to the first joint 41 is provided with a second pipe clamp 4511, and the second pipe clamp 4511 is used to control the on-off of the liquid path between the external liquid source and the venous catheter 5.

[0088] The bifurcated pipe 45 integrates the first joint 41, the second joint 42 and the third joint 43 in a relatively compact pipe structure through the main pipe 451 and the branch pipe 452. The integration of the distribution assembly 4 is improved, the number and complexity of pipe connections are simplified, and the structure of the whole distribution assembly 4 is more simple.

[0089] The main pipe 451 and the branch pipe 452 form relatively independent and interrelated liquid path channels. The main pipe 451 is mainly responsible for connecting an external liquid source and the venous catheter 5, and the branch pipe 452 is used for connecting the liquid supply assembly 1 and the main pipe 451. By controlling the opening and closing of the first pipe clamp 4521, the liquid path between the liquid supply assembly 1 and the venous catheter 5 can be flexibly controlled. By controlling the opening and closing of the second pipe clamp 4511, the liquid path between the external liquid source and the venous catheter 5 can be controlled. When automatic tube sealing operation is needed, the second pipe clamp 4511 is closed, and the first pipe clamp 4521 is opened. The liquid in the liquid supply assembly 1 can flow to the venous catheter 5 through the second joint 42, the branch pipe 452, the main pipe 451 and the third joint 43. When automatic tube sealing operation is not needed, and routine infusion work is performed, the first pipe clamp 4521 is closed, and the second pipe clamp 4511 is opened. The external liquid source can flow to the venous catheter 5 through the main pipe 451 and the third joint 43. This flexible liquid path switching mode can meet different clinical needs and realize rapid conversion of various liquid delivery modes.

[0090] Another application of the present application discloses a pipe flushing device, which comprises the automatic positive pressure tube sealing device. The driven gear 21 in the automatic positive pressure tube sealing device is a non-complete gear. The non-complete gear and the rack 121 are intermittently engaged according to a preset frequency, so that the piston rod 12 moves along the first preset direction F1 relative to the liquid storage pipe 11 according to the preset frequency.

[0091] The non-complete gear is not provided with teeth on the entire circumference. During rotation, only the toothed part can engage with the rack 121 to drive the piston rod 12 to move along the first preset direction F1. When the non-toothed part is opposite to the rack 121, the piston rod 12 stops moving. This ensures the intermittency of the movement of the piston rod 12, so that the liquid in the liquid storage space 111 can be discharged in a pulse mode, and the alternating process of injection and pause during manual pipe flushing is accurately simulated.

[0092] In actual use, different patients have different requirements for the frequency of pipe flushing operation and the injection amount of liquid each time due to different age groups or other individual difference factors. The number of teeth and the interval distance of the driven gear 21 can be designed according to actual requirements to achieve different pipe flushing effects of different frequencies, thereby meeting the requirements of different patients.

[0093] The technical means disclosed in the present application scheme is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes technical solutions composed of any combination of the above technical features. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements are also considered to be within the protection scope of the present application.

Claims

1. An automatic positive pressure sealing device, characterized in that, include: The fluid supply assembly includes a fluid storage tube and a piston rod; the fluid storage tube has an interconnected fluid storage space and a fluid outlet; the fluid outlet is used to connect to a venous catheter connected to a human blood vessel. The piston rod is at least partially disposed within the liquid storage space and can move relative to the liquid storage tube in a first preset direction. The liquid storage space between the piston rod and the liquid outlet is used to store liquid. The first preset direction is the direction in which the piston rod faces the liquid outlet. A transmission assembly is connected to the piston rod and is used to move the piston rod relative to the liquid storage tube along the first preset direction. An elastic energy storage component is connected to the transmission component and is used to convert mechanical energy into elastic potential energy so that the transmission component automatically drives the piston rod to move. The transmission assembly includes a driving gear and a driven gear. The driving gear is connected to the elastic energy storage assembly and the driven gear respectively. The piston rod is provided with a rack, which is parallel to the first preset direction. The rack meshes with the driven gear. The elastic energy storage component includes a fixed shell, a coil spring, and a rotating shaft. The coil spring is positioned inside the fixed shell, and the end of the inner coil of the coil spring is provided with a rotating cylinder. When the rotating cylinder rotates along a second preset direction, the coil spring will contract and store energy. The rotating shaft is located inside the fixed shell, and both ends of the rotating shaft are coaxially connected to the drive gear and the rotating cylinder, respectively, so as to convert the elastic potential energy of the coil spring into the rotational kinetic energy of the drive gear.

2. The automatic positive pressure sealing device according to claim 1, characterized in that, The rotating shaft is provided with a first ratchet at one end near the rotating cylinder, and the inner wall of the rotating cylinder is provided with a first locking tooth distributed in the circumferential direction. When the first locking tooth engages with the first ratchet tooth, the rotating cylinder will not drive the rotating shaft to rotate in the second preset direction when the rotating cylinder rotates along the second preset direction. When the coil spring releases its elastic potential energy, the rotating cylinder drives the rotating shaft to rotate in the opposite direction to the second preset direction.

3. The automatic positive pressure sealing device according to claim 1, characterized in that, The elastic energy storage component also includes multiple sliding rollers, which are spaced apart between different coils of the coil spring and arranged sequentially along the direction from the inner coil to the outer coil of the coil spring. The sliding rollers are in rolling contact with the coil spring. The fixed shell is provided with a sliding groove, which extends along the direction from the inner coil to the outer coil of the coil spring. The sliding rollers are slidably connected to the sliding groove.

4. The automatic positive pressure sealing device according to claim 3, characterized in that, The cross-section of the coil spring includes an outer side surface, the outer side surface is provided with a protrusion, the protrusion is in rolling contact with the sliding roller; the protrusion is provided with an oil groove, the oil groove is used to store lubricating oil to form an oil film on the outer side surface.

5. The automatic positive pressure sealing device according to claim 1, characterized in that, The piston rod is provided with a second ratchet, which is distributed along the first preset direction. The inner wall of the liquid storage tube is provided with a second locking tooth. The second ratchet engages with the second locking tooth, allowing the piston rod to move unidirectionally along the first preset direction. The second ratchet is provided with at least two scale openings, which are evenly distributed along the first preset direction. The piston rod is provided with a first scale value corresponding to the position of the scale opening, which is used to indicate the movement distance of the piston rod.

6. The automatic positive pressure sealing device according to any one of claims 1-5, characterized in that, It also includes a liquid dispensing assembly, which includes a first connector, a second connector, and a third connector; the first connector is used to connect to an external liquid source, the second connector is used to connect to the liquid supply assembly, and the third connector is used to connect to the intravenous catheter; the liquid dispensing assembly is used to control the opening and closing of the liquid path between the intravenous catheter and the liquid supply assembly and the external liquid source, respectively.

7. The automatic positive pressure sealing device according to claim 6, characterized in that, The liquid dispensing assembly includes a three-way valve, which is connected to the first connector, the second connector, and the third connector respectively. The three-way valve is equipped with a switch, which is used to control the opening and closing of the liquid passage between the liquid supply assembly and the venous catheter, or the opening and closing of the liquid passage between the external liquid source and the venous catheter.

8. The automatic positive pressure sealing device according to claim 6, characterized in that, The fluid distribution assembly includes a bifurcated tube, which includes a main tube and a branch tube. The main tube has a first connector and a third connector at both ends. One end of the branch tube is connected to the second connector, and the other end is connected to the main tube. The branch tube is equipped with a first clamp, which is used to control the flow of fluid between the fluid supply assembly and the venous catheter. The main tube is equipped with a second clamp on the side near the first connector, which is used to control the flow of fluid between the external fluid source and the venous catheter.

9. A pipe-flushing device, characterized in that, The automatic positive pressure sealing device according to any one of claims 1-8, wherein the driven gear is a non-complete gear, and the non-complete gear meshes with the rack intermittently at a preset frequency, causing the piston rod to move intermittently relative to the liquid storage tube along the first preset direction at the preset frequency.

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