Infusion device capable of automatically controlling speed and infusion assembly

Abstract

The invention relates to the technical field of medical apparatus and instruments, and discloses an automatic-speed-control infusion device and infusion assembly.The automatic-speed-control infusion device comprises a shell, a sliding hole is formed in the shell, and a push rod is slidably connected into the sliding hole; the side wall of the push rod is sleeved with a fourth spring, the side wall of the push rod is fixedly connected with a limiting ring, the fourth spring is sleeved with the portion, above the limiting ring, of the side wall of the push rod, elastic potential energy is stored through the fourth spring, the spring releasing time is controlled through the limiting assembly, and the push rod is driven to move linearly to complete infusion. The speed adjusting assembly adjusts the contact position of the driving rotary disc and the driven rotary disc through a rotary knob, changes the pressure of a friction plate and achieves flow speed adjustment, compared with a traditional infusion pump, the infusion pump gets rid of dependence on electric power, when a premature infant in a ward needs a small amount of liquid to be injected or blood is drawn, constant thrust or negative pressure is maintained when micro-injection or liquid drawing is achieved, and the infusion efficiency is improved. The system is especially suitable for emergency transfer, remote areas and other scenes without stable power supply, and the risk of treatment interruption caused by power failure is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a self-controlled speed infusion device and an infusion assembly. Background Art

[0002] At present, the self-controlled speed infusion devices used in clinical practice are mainly divided into two categories: electronic control type and mechanical control type. Electronic control type devices usually rely on motor drive, flow sensor and microcontroller system, and set the infusion speed through programming or button pressing. Their structure is complex and costly, and they require additional power supply. Their applicability is limited in scenarios without stable power support (such as emergency transport and remote areas). Mechanical control type devices mostly use gear sets, flow limiting valves or gravity drive structures. For example, the flow rate is controlled by adjusting the tightness of the roller clamping the infusion tube, but its adjustment accuracy is low, the gear position is fixed, and long-term use is prone to flow rate deviation due to mechanical wear. In addition, existing mechanical devices are usually only suitable for infusion sets or syringes of specific specifications, lack versatility, and are difficult to meet the needs of rapid switching in multiple scenarios.

[0003] Therefore, on the one hand, electronic control devices rely on external energy and precision components, and are prone to the risk of loss of control due to power outages, component failures, or electromagnetic interference in complex medical environments. For example, in emergency scenarios, sudden shutdown of the device may delay treatment. On the other hand, traditional mechanical flow rate control devices are rough to adjust and have poor flexibility, and the flow limiting valve adjustment requires repeated trial and error calibration, resulting in cumbersome and inefficient operation for medical staff. This is especially true when used for newborns in wards, where premature babies require small amounts of fluid injections or blood draws. It is not possible to maintain a constant thrust or negative pressure during micro-injections or fluid draws. In addition, existing devices are difficult to adapt to syringes or infusion sets of different specifications. If the injection speed and dosage need to be adjusted, the entire set of equipment often needs to be replaced, which not only increases the cost of consumables, but may also delay treatment in an emergency due to equipment switching. Summary of the Invention

[0004] The purpose of the present invention is to provide a technical solution to solve the problems raised in the above background technology that the electronic control device in the prior art relies on external energy and the traditional mechanical flow rate control device has rough adjustment and poor flexibility.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A self-controlled rate infusion device comprises a housing, with mounting assemblies slidably mounted on both ends of the housing, a sliding hole being formed inside the housing, a push rod being slidably connected in the sliding hole, and docking assemblies being fixedly mounted on both ends of the push rod;

[0007] The side wall of the push rod is sleeved with a fourth spring, the side wall of the push rod is fixedly connected to a limit ring, the fourth spring is sleeved on the side wall of the push rod above the limit ring, and the fourth spring is located in the sliding hole, and a limit assembly for limiting the movement of the limit ring is slidably installed inside the housing;

[0008] An adjustment component is installed on the side wall and inside of the shell, and the adjustment component is fixedly connected to the side wall of the push rod.

[0009] Preferably, the limiting assembly includes a limiting mechanism and a reset mechanism, the limiting mechanism includes a limiting block and a first spring, a second slide groove is opened inside the shell, the limiting block is slidably installed in the second slide groove, the tail of the limiting block and the second slide groove are installed with a first spring, and the top surface of the limiting block is engaged with the reset mechanism.

[0010] Preferably, the reset mechanism includes a button, a movable plate and a first gear, one end of the movable plate is fixedly mounted on the button, the movable plate is slidingly connected in the shell, a first tooth groove is provided on the bottom surface of the movable plate, the first gear is rotatably connected in the shell, a second tooth groove is provided on the top surface of the limit block, and the side walls of the first gear are respectively meshed with the first tooth groove and the second tooth groove.

[0011] Preferably, the speed regulation assembly includes a knob, a rotating rod, a limit plate, a pushing mechanism, a friction mechanism and a transmission mechanism, the side wall center of the knob is fixedly connected to one end of the rotating rod, the limit plate is fixedly connected to the side wall of the rotating rod and is rotatably connected in the side wall of the shell, the other end of the rotating rod is fixedly installed with the pushing mechanism, the pushing mechanism is fixedly installed with one side of the friction mechanism, the other side of the friction mechanism is fixedly installed with the transmission mechanism, and the transmission mechanism is installed on the side wall of the push rod.

[0012] Preferably, the pushing mechanism includes an active turntable, a boss, a driven turntable and a shaft rod, the end of the turntable is fixedly mounted on the active turntable, three bosses are provided, the diameters of the three bosses decrease successively, one of the bosses is in conflict with the side wall of the driven turntable, one end of the shaft rod is fixedly mounted on the driven turntable, and the other end of the shaft rod is fixedly mounted on the friction mechanism.

[0013] Preferably, the friction mechanism includes a fixed ring, a first friction plate, and a second friction plate. The interior of the fixed ring is rotatably connected to the first friction plate and the second friction plate respectively. The side wall of the first friction plate is fixedly installed on the other end of the shaft, and the side wall of the second friction plate is fixedly installed on the transmission mechanism. The first friction plate is in contact with the second friction plate.

[0014] Preferably, the transmission mechanism includes a mounting cylinder, a second gear, a rotating shaft and a rack, one end of the mounting cylinder is fixedly mounted on the second friction plate, the other end of the mounting cylinder is fixedly connected to the side wall of the second gear, the second gear is rotatably connected inside the shell through the rotating shaft, the side wall of the rack is meshed with the second gear, the end of the rack is fixedly mounted on the side wall of the push rod, and the rack is slidably connected in the shell.

[0015] Preferably, the mounting assembly includes an insert plate, a movable rod, a fixed rod and a second spring, one end of the movable rod is fixedly connected to the insert plate, the other end of the movable rod is provided with an axial hole, the movable rod is slidably connected to the side wall of the fixed rod through the axial hole, and first sliding grooves are respectively provided on both sides of the two end portions of the shell, the two ends of the fixed rod are fixedly installed in the first sliding grooves, and a second spring is sleeved on one side of the fixed rod, and the second spring is in contact with the side wall of the movable rod.

[0016] Preferably, the docking assembly includes a mounting plate, a pull ring, a connecting rod, a third spring, a baffle, a limiting hole and a limiting rod. The mounting plate is fixedly mounted on both ends of the push rod, and the connecting rod is slidably connected on both sides of the mounting plate. The third spring is sleeved on the side wall of the connecting rod, one end of the connecting rod is fixedly connected to the pull ring, and the other end of the connecting rod is fixedly connected to the side wall of the baffle. The limiting rod is fixedly connected to the side wall of the baffle, and a limiting hole is opened on the side wall of the mounting plate, and the limiting rod is slidably connected in the limiting hole.

[0017] An infusion assembly includes a syringe, which includes a piston rod and a syringe. The piston rod moves like a piston in the syringe. A push piece is integrally formed on the top of the piston rod. Finger buckles are integrally formed on both sides of the top of the syringe. The push piece is installed in a mounting plate, and the top surface of the baffle contacts the push piece.

[0018] Technical effects and advantages of the present invention: Compared with the prior art, the self-controlled rate infusion device and infusion assembly proposed by the present invention have the following advantages:

[0019] 1. The present invention stores elastic potential energy through the fourth spring, and uses the limit assembly to control the release time of the spring, driving the push rod to move linearly to complete the infusion. The speed control assembly adopts the friction transmission principle, and adjusts the contact position of the active turntable and the driven turntable through the knob to change the friction plate pressure to achieve flow rate regulation. Especially when premature babies in the ward need a small amount of liquid injection or blood drawing, it can achieve micro-injection or maintain a constant thrust or negative pressure when drawing liquid, and can accurately control the speed and dosage of liquid infusion, avoid errors and fluctuations caused by manual operation, stabilize the concentration of drugs in the body, improve the treatment effect, reduce adverse reactions caused by uneven injection, get rid of dependence on electricity, and is suitable for emergency transportation, remote areas and other scenes without stable power supply, avoiding the risk of treatment interruption due to power outages. Compared with traditional electronic control devices, the mechanical structure is more reliable and has strong anti-interference ability, reducing the risk of loss of control caused by electromagnetic interference or component failure;

[0020] 2. The present invention adopts an installation component, which adapts to syringe finger clips of different thicknesses through the elastic force of the second spring to achieve quick loading and unloading. The third spring is used to drive the baffle to press the syringe push piece, and the limit rod is used to ensure the connection stability. It is compatible with piston rods of different sizes. When installed correctly, the push rod moves upward to draw liquid, and when installed reversely, the push rod moves downward to infuse liquid. The function can be switched without changing the equipment. The quick docking structure reduces the equipment switching time, gains precious time in emergency treatment, and reduces the cost of consumables. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the automatic rate-controlled infusion device of the present invention;

[0022] Figure 2 It is a schematic structural diagram of a side cross-section of the housing of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the docking assembly of the present invention;

[0024] Figure 4 It is a schematic structural diagram of the syringe of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the installation of the syringe and the automatic speed-controlled infusion device of the present invention;

[0026] Figure 6 For the present invention Figure 2 A schematic diagram of the structure enlarged in the middle;

[0027] Figure 7 It is a structural schematic diagram of the speed regulating assembly of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the friction mechanism of the present invention.

[0029] In the picture:

[0030] 1. Housing; 11. First chute; 12. Slide hole; 13. Second chute;

[0031] 2. Push rod; 21. Limit ring;

[0032] 3. Limiting assembly; 31. Button; 32. Moving plate; 33. First tooth groove; 34. First gear; 35. Limiting block; 36. Second tooth groove; 37. First spring;

[0033] 4. Mounting assembly; 41. Insert plate; 42. Moving rod; 43. Fixing rod; 44. Second spring;

[0034] 5. Docking assembly; 51. Mounting plate; 52. Pull ring; 53. Connecting rod; 54. Third spring; 55. Baffle; 56. Limiting hole; 57. Limiting rod;

[0035] 6. Fourth spring;

[0036] 7. Speed regulating assembly; 71. Knob; 72. Rotating rod; 73. Limiting plate; 74. Active rotating plate; 75. Boss; 76. Driven rotating plate; 77. Shaft; 78. Friction mechanism; 781. Retaining ring; 782. First friction plate; 783. Second friction plate; 79. Mounting cylinder; 710. Second gear; 711. Rotating shaft; 712. Rack;

[0037] 8. Syringe; 81. Piston rod; 811. Push piece; 82. Syringe; 812. Finger clip. DETAILED DESCRIPTION

[0038] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. Furthermore, features described for some examples may be combined in other examples.

[0039] See also Figure 1-8 , the embodiment provided by the present invention:

[0040] Example 1

[0041] like Figure 1 and Figure 2As shown, a self-controlled rate infusion device includes a shell 1, and mounting components 4 are slidably installed on both sides of the two end portions of the shell 1. The mounting components 4 include an insert plate 41, a moving rod 42, a fixed rod 43 and a second spring 44. One end of the moving rod 42 is fixedly connected to the insert plate 41, and the other end of the moving rod 42 is provided with an axial hole. The moving rod 42 is slidably connected to the side wall of the fixed rod 43 through the axial hole. First slide grooves 11 are respectively provided on both sides of the two end portions of the shell 1, and both ends of the fixed rod 43 are fixedly installed in the first slide grooves 11, and a second spring 44 is sleeved on one side of the fixed rod 43, and the second spring 44 conflicts with the side wall of the moving rod 42.

[0042] The housing 1 is provided with a sliding hole 12, in which a push rod 2 is slidably connected, and both ends of the push rod 2 are fixedly mounted with docking components 5. Figure 3 As shown, the docking assembly 5 includes a mounting plate 51, a pull ring 52, a connecting rod 53, a third spring 54, a baffle 55, a limiting hole 56 and a limiting rod 57. The mounting plate 51 is fixedly mounted on both ends of the push rod 2, and the connecting rod 53 is slidably connected on both sides of the mounting plate 51. The third spring 54 is sleeved on the side wall of the connecting rod 53. One end of the connecting rod 53 is fixedly connected to the pull ring 52, and the other end of the connecting rod 53 is fixedly connected to the side wall of the baffle 55. The limiting rod 57 is fixedly connected to the side wall of the baffle 55. The side wall of the mounting plate 51 is provided with a limiting hole 56, and the limiting rod 57 is slidably connected in the limiting hole 56.

[0043] like Figure 4 and Figure 5 As shown, an infusion assembly includes a syringe 8, which includes a piston rod 81 and a syringe 82. The piston rod 81 moves like a piston in the syringe 82. A push piece 811 is integrally formed on the top of the piston rod 81, and finger buckles 812 are integrally formed on both sides of the top of the syringe 82. The push piece 811 is installed in the mounting plate 51, and the top surface of the baffle 55 is in contact with the push piece 811. The side wall of the insert plate 41 is provided with a slot, and the finger buckle 812 is inserted into the slot.

[0044] Installation of syringe 82 and mounting assembly 4: When the finger clip 812 of syringe 8 is inserted into the slot of insert plate 41, the insert plate 41 is forced outward, driving the movable rod 42 to slide on the fixed rod 43 and compressing the second spring 44. The elastic force generated by the second spring 44 causes the insert plate 41 to tightly clamp the finger clip 812, forming a stable mechanical connection, enabling rapid docking and detachment of syringe 8 with the automatic rate-controlled infusion device. The spring's elastic force provides a stable clamping force, ensuring that syringe 8 does not fall off during infusion or withdrawal.

[0045] Installation of piston rod 81 and docking assembly 5: When pull ring 52 is pulled, connecting rod 53 moves baffle 55 and stretches third spring 54, allowing push piece 811 of syringe 8 to be placed into mounting plate 51. After releasing pull ring 52, the elastic force of third spring 54 resets baffle 55 and compresses push piece 811. Limit rod 57 slides within limiting hole 56, ensuring accurate movement of baffle 55 and achieving reliable connection and control of piston rod 81. This allows the movement of push rod 2 to be accurately transmitted to the piston of syringe 8, completing the withdrawal or infusion process.

[0046] It is worth noting that after the syringe 8 is connected to the device via the mounting assembly 4 and the docking assembly 5, the linear motion of the push rod 2 drives the piston rod 81 to perform piston motion within the syringe 82. When the syringe is installed in reverse, the push rod 2 moves upward to extract liquid; when the syringe is installed in the correct position, the push rod 2 moves downward to push liquid.

[0047] Example 2

[0048] like Figure 2 As shown, on the basis of Example 1, the side wall of the push rod 2 is sleeved with a fourth spring 6, and the side wall of the push rod 2 is fixedly connected to the limit ring 21. The fourth spring 6 is sleeved on the side wall of the push rod 2 above the limit ring 21, and the fourth spring 6 is located in the slide hole 12. A limit assembly 3 for limiting the movement of the limit ring 21 is slidably installed inside the housing 1. The fourth spring 6 is sleeved on the side wall of the push rod 2 above the limit ring 21. When the push rod 2 moves upward, the limit ring 21 compresses the fourth spring 6 to store elastic potential energy; when the limit assembly 3 releases the limit ring 21, the elastic force of the fourth spring 6 pushes the push rod 2 downward to realize the infusion process;

[0049] Specifically, such as Figure 6 As shown, the limiting assembly 3 includes a limiting mechanism and a reset mechanism, the limiting mechanism includes a limiting block 35 and a first spring 37, a second slide groove 13 is opened inside the shell 1, the limiting block 35 is slidably installed in the second slide groove 13, the tail of the limiting block 35 and the second slide groove 13 are installed with a first spring 37, and the top surface of the limiting block 35 is engaged with the reset mechanism.

[0050] The reset mechanism includes a button 31, a movable plate 32 and a first gear 34. One end of the movable plate 32 is fixedly installed with the button 31. The movable plate 32 is slidably connected in the shell 1. The bottom surface of the movable plate 32 is provided with a first tooth groove 33. The first gear 34 is rotatably connected in the shell 1. The top surface of the limit block 35 is provided with a second tooth groove 36. The side walls of the first gear 34 are respectively engaged with the first tooth groove 33 and the second tooth groove 36.

[0051] Since the top surface of the limit block 35 is a plane and the bottom surface is an inclined surface, the limit block 35 is clamped on the limit ring 21 under the action of the first spring 37, preventing the push rod 2 from moving. When the button 31 is pressed, the movable plate 32 drives the first gear 34 to rotate through the first tooth groove 33, and the first gear 34 then drives the limit block 35 to retract through the second tooth groove 36, thereby releasing the restriction on the limit ring 21 and controlling the starting timing of the push rod 2.

[0052] like Figure 7 As shown, the side wall and interior of the shell 1 are installed with a speed regulating assembly 7, and the speed regulating assembly 7 is fixedly installed on the side wall of the push rod 2. Specifically, the speed regulating assembly 7 includes a knob 71, a rotating rod 72, a limiting plate 73, a pushing mechanism, a friction mechanism 78 and a transmission mechanism. The center of the side wall of the knob 71 is fixedly connected to one end of the rotating rod 72, the limiting plate 73 is fixedly connected to the side wall of the rotating rod 72 and is rotatably connected in the side wall of the shell 1, the other end of the rotating rod 72 is fixedly installed with the pushing mechanism, the pushing mechanism is fixedly installed with one side of the friction mechanism 78, the other side of the friction mechanism 78 is fixedly installed with the transmission mechanism, and the transmission mechanism is installed on the side wall of the push rod 2.

[0053] The pushing mechanism includes a driving turntable 74, a boss 75, a driven turntable 76 and a shaft 77. The end of the turntable 72 is fixedly mounted on the driving turntable 74. There are three bosses 75. The diameters of the three bosses 75 decrease successively. One of the bosses 75 abuts against the side wall of the driven turntable 76. One end of the shaft 77 is fixedly mounted on the driven turntable 76, and the other end of the shaft 77 is fixedly mounted on the friction mechanism 78.

[0054] The rotating knob 71 drives the driving rotary disk 74 to rotate, and the three bosses 75 of different diameters on the driving rotary disk 74 abut against the driven rotary disk 76 to change the lateral position of the driven rotary disk 76, thereby adjusting the axial displacement of the shaft 77.

[0055] like Figure 8 As shown, the friction mechanism 78 includes a fixing ring 781, a first friction plate 782, and a second friction plate 783. The interior of the fixing ring 781 is rotatably connected to the first friction plate 782 and the second friction plate 783 respectively. The side wall of the first friction plate 782 is fixedly mounted on the other end of the shaft 77, and the side wall of the second friction plate 783 is fixedly mounted on the transmission mechanism. The first friction plate 782 is in contact with the second friction plate 783. The displacement of the shaft 77 changes the contact pressure between the first friction plate 782 and the second friction plate 783, thereby adjusting the magnitude of the friction force.

[0056] The transmission mechanism includes a mounting cylinder 79, a second gear 710, a rotating shaft 711 and a rack 712. One end of the mounting cylinder 79 is fixedly mounted on the second friction plate 783, and the other end of the mounting cylinder 79 is fixedly connected to the side wall of the second gear 710. The second gear 710 is rotatably connected inside the housing 1 through the rotating shaft 711. The side wall of the rack 712 is meshed with the second gear 710. The end of the rack 712 is fixedly mounted on the side wall of the push rod 2, and the rack 712 is slidably connected in the housing 1.

[0057] The friction force is transmitted to the mounting cylinder 79 and the second gear 710 through the second friction plate 783. The second gear 710 is engaged with the rack 712 to convert the rotational motion into the linear motion of the push rod 2. The greater the friction force, the lower the transmission efficiency and the slower the movement speed of the push rod 2. The smaller the friction force, the higher the transmission efficiency and the faster the movement speed of the push rod 2, thereby realizing the adjustment of the movement speed of the push rod 2 to meet the flow rate requirements of different infusion scenarios.

[0058] The above describes the embodiments of the present invention, but the present invention is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms under the guidance of the present invention, all of which are protected by the present invention.

Claims

1. A self-controlled rate infusion device, characterized in that: The invention comprises a shell (1), wherein mounting assemblies (4) are slidably mounted on both sides of the two ends of the shell (1), a sliding hole (12) is provided inside the shell (1), a push rod (2) is slidably connected in the sliding hole (12), and docking assemblies (5) are fixedly mounted on both ends of the push rod (2); The side wall of the push rod (2) is sleeved with a fourth spring (6), the side wall of the push rod (2) is fixedly connected to a limiting ring (21), the fourth spring (6) is sleeved on the side wall of the push rod (2) above the limiting ring (21), and the fourth spring (6) is located in the sliding hole (12), and a limiting assembly (3) for limiting the movement of the limiting ring (21) is slidably installed inside the housing (1); An adjustment component is installed on the side wall and inside of the housing (1), and the adjustment component is fixedly connected to the side wall of the push rod (2).

2. The automatic rate-controlled infusion device according to claim 1, characterized in that: The limiting assembly (3) includes a limiting mechanism and a reset mechanism, the limiting mechanism includes a limiting block (35) and a first spring (37), a second slide groove (13) is provided inside the housing (1), the limiting block (35) is slidably installed in the second slide groove (13), the tail of the limiting block (35) and the second slide groove (13) are installed with a first spring (37), and the top surface of the limiting block (35) is engaged with the reset mechanism.

3. The automatic rate-controlled infusion device according to claim 2, characterized in that: The reset mechanism comprises a button (31), a movable plate (32) and a first gear (34); one end of the movable plate (32) is fixedly mounted on the button (31); the movable plate (32) is slidably connected in the housing (1); a first tooth groove (33) is provided on the bottom surface of the movable plate (32); the first gear (34) is rotatably connected in the housing (1); a second tooth groove (36) is provided on the top surface of the limit block (35); and the side walls of the first gear (34) are respectively meshed with the first tooth groove (33) and the second tooth groove (36).

4. The automatic rate-controlled infusion device according to claim 1, characterized in that: The speed regulating assembly (7) comprises a knob (71), a rotating rod (72), a limiting plate (73), a pushing mechanism, a friction mechanism (78) and a transmission mechanism. The center of the side wall of the knob (71) is fixedly connected to one end of the rotating rod (72). The limiting plate (73) is fixedly connected to the side wall of the rotating rod (72) and is rotatably connected in the side wall of the housing (1). The other end of the rotating rod (72) is fixedly installed with the pushing mechanism. The pushing mechanism is fixedly installed with one side of the friction mechanism (78). The other side of the friction mechanism (78) is fixedly installed with the transmission mechanism. The transmission mechanism is installed on the side wall of the push rod (2).

5. The automatic rate-controlled infusion device according to claim 4, characterized in that: The pushing mechanism comprises a driving turntable (74), a boss (75), a driven turntable (76) and a shaft (77). The end of the turntable (72) is fixedly mounted on the driving turntable (74). Three bosses (75) are provided. The diameters of the three bosses (75) decrease in sequence. One of the bosses (75) contacts the side wall of the driven turntable (76). One end of the shaft (77) is fixedly mounted on the driven turntable (76), and the other end of the shaft (77) is fixedly mounted on the friction mechanism (78).

6. The automatic rate-controlled infusion device according to claim 5, characterized in that: The friction mechanism (78) includes a fixed ring (781), a first friction plate (782), and a second friction plate (783). The interior of the fixed ring (781) is rotatably connected to the first friction plate (782) and the second friction plate (783), respectively. The side wall of the first friction plate (782) is fixedly mounted on the other end of the shaft (77), and the side wall of the second friction plate (783) is fixedly mounted on the transmission mechanism. The first friction plate (782) is in contact with the second friction plate (783).

7. The automatic rate-controlled infusion device according to claim 6, characterized in that: The transmission mechanism comprises a mounting cylinder (79), a second gear (710), a rotating shaft (711) and a rack (712); one end of the mounting cylinder (79) is fixedly mounted on the second friction plate (783); the other end of the mounting cylinder (79) is fixedly connected to the side wall of the second gear (710); the second gear (710) is rotatably connected inside the housing (1) via the rotating shaft (711); the side wall of the rack (712) is meshed with the second gear (710); the end of the rack (712) is fixedly mounted on the side wall of the push rod (2), and the rack (712) is slidably connected in the housing (1).

8. The automatic rate-controlled infusion device according to claim 1, characterized in that: The mounting assembly (4) comprises an inserting plate (41), a moving rod (42), a fixed rod (43) and a second spring (44); one end of the moving rod (42) is fixedly connected to the inserting plate (41); the other end of the moving rod (42) is provided with an axial hole; the moving rod (42) is slidably connected to the side wall of the fixed rod (43) through the axial hole; first sliding grooves (11) are respectively provided on both sides of the two end portions of the housing (1); both ends of the fixed rod (43) are fixedly installed in the first sliding grooves (11); and a second spring (44) is sleeved on one side of the fixed rod (43); the second spring (44) contacts the side wall of the moving rod (42).

9. The automatic rate-controlled infusion device according to claim 1, characterized in that: The docking assembly (5) comprises a mounting plate (51), a pull ring (52), a connecting rod (53), a third spring (54), a baffle (55), a limiting hole (56) and a limiting rod (57). The mounting plate (51) is fixedly mounted on both ends of the push rod (2), the connecting rod (53) is slidably connected on both sides of the mounting plate (51), the third spring (54) is sleeved on the side wall of the connecting rod (53), one end of the connecting rod (53) is fixedly connected to the pull ring (52), the other end of the connecting rod (53) is fixedly connected to the side wall of the baffle (55), the limiting rod (57) is fixedly connected to the side wall of the baffle (55), the side wall of the mounting plate (51) is provided with a limiting hole (56), and the limiting rod (57) is slidably connected in the limiting hole (56).

10. An infusion assembly, comprising the automatic rate-controlled infusion device according to any one of claims 1 to 9, characterized in that: The invention comprises a syringe (8), wherein the syringe (8) comprises a piston rod (81) and a syringe (82), wherein the piston rod (81) moves like a piston in the syringe (82), a push piece (811) is integrally formed on the top of the piston rod (81), and finger buckles (812) are integrally formed on both sides of the top of the syringe (82), wherein the push piece (811) is installed in the mounting plate (51), and the top surface of the baffle (55) contacts the push piece (811).

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