Fluid restrictor and automatic infusion device with time control

Abstract

The present disclosure discloses a fluid speed limiter and an automatic infusion device with time control function, comprising a switch cap, a speed limiter, an adjusting piece, a knob and a connecting passage. The switch cap has a cylindrical cavity, the speed limiter and the adjusting piece are both circular pieces and are arranged in the cylindrical cavity to be separated, the surface of the speed limiter has a through hole area formed by a plurality of through holes, the adjusting piece has a notch, one end of the knob enters the cylindrical cavity of the switch cap from a port of the switch cap and is connected with the adjusting piece, the other end of the knob is located outside the port of the switch cap, and the connecting passage is connected with the switch cap. The speed limiter of the present disclosure can adjust the flow size of the passing fluid, thereby controlling the reset time of the compressed telescopic air bag, controlling the time of automatic injection, achieving the purpose of one-time infusion without supervision, and saving medical resources and manpower without using complex and high-cost micro pumps.

Description

Technical Field

[0001] This disclosure relates to the field of syringe technology, and more particularly to a fluid rate limiter and an automatic infusion device with timing control function. Background Technology

[0002] The information disclosed in this background art is intended only to enhance the understanding of the overall background of this disclosure and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Anesthesia involves administering numerous medications to the patient. Besides standard anesthetics, many auxiliary drugs are used, such as sedatives, analgesics, antibiotics, and traditional Chinese medicine. These auxiliary drugs assist anesthesiologists in managing anesthesia and surgery. Generally, to prevent side effects, timely and measured infusions are necessary. Injection times vary. For example, antibiotics require an injection time of at least 30 minutes to avoid allergic reactions. Traditional Chinese medicine has complex components and may cause adverse reactions during injection, thus also requiring injection time limits. Dexmedetomidine is currently the most widely used sedative under anesthesia, and its injection time should be at least 15 minutes. Previously, these drugs were administered via anesthesia pump by a single anesthesia nurse for safety. An electronic pump is a precise electronic device set by the volume of fluid injected per unit time. Furthermore, for some strictly controlled drugs, concentration conversion is required, altering the usual injection time settings. Each resetting increases the probability of error. The number of electronic pumps available to a department is limited. Therefore, when multiple operating rooms are administering medications simultaneously, the availability of electronic pumps becomes very strained, and sometimes there is a long waiting time before they can be used. While manual injection allows for better monitoring of the patient's condition during medication administration, it increases the workload and takes up valuable time from nurses. Summary of the Invention

[0004] To address the aforementioned problems, this disclosure provides a fluid rate limiter and an automatic infusion device with time control function, meeting the needs of some drugs requiring time-limited injection, achieving the goal of single-use infusion without supervision, and eliminating the need for complex and costly micro-infusion pumps, thus saving medical resources and manpower. The technical solution of this disclosure is as follows to achieve the above objectives.

[0005] On one hand, this disclosure provides a fluid flow limiter, comprising: a switch cap, a flow limiter plate, an adjusting plate, a knob, and a connecting passage. The switch cap has a cylindrical inner cavity. The flow limiter plate and the adjusting plate are both circular plates, stacked and separated within the cylindrical inner cavity. The surface of the flow limiter plate has a through-hole area formed by a plurality of concentrated through holes. The adjusting plate has a notch, and the notch is larger than the size of the through holes. One end of the knob enters the cylindrical inner cavity of the switch cap from one port and connects to the adjusting plate. The other end of the knob is located outside the port of the switch cap, so that rotating the knob drives the adjusting plate to rotate, thereby changing the degree of overlap between the notch and the through holes and limiting the fluid flow through the flow limiter plate and the adjusting plate. One end of the connecting passage is connected to the other port of the switch cap, and the flow limiter plate, adjusting plate, and knob are sequentially pressed into the switch cap.

[0006] In some typical embodiments, one end of the switch cap has an annular positioning element, which is fixedly connected to the switch cap via a connecting rod. One end of the knob passes through the annular positioning element and connects to the adjusting plate, and the knob can rotate within the annular positioning element. The connecting passage sequentially presses the speed limiter, adjusting plate, and knob onto the annular positioning element.

[0007] In some typical embodiments, the knob includes a handle and a pivot. The handle is located outside the switch cap, one end of the pivot is connected to the handle, and the other end passes through the annular positioning member and is connected to the adjusting plate.

[0008] In some typical embodiments, the connecting passage is threaded into the other end port of the switch cap to facilitate the assembly of the speed limiter and the regulating plate.

[0009] In some typical embodiments, the connection path has a channel that communicates with the inner cavity of the switch cap to facilitate the flow through the connection path.

[0010] In some typical embodiments, a gasket is provided between the connecting passage and the speed limiter, thereby enabling the connecting passage to better seal the edge of the speed limiter and prevent air leakage.

[0011] On the other hand, this disclosure provides an automatic infusion device with timing control function, comprising: a housing, a sliding member, a trigger, a limit switch, a telescopic airbag, and the aforementioned fluid speed limiter. The sliding member is slidably disposed within the receiving cavity of the housing. The trigger is connected to the sliding member via a slide rail on the outer wall of the housing. The fluid speed limiter is connected to the tail end of the housing. A spring is provided in the telescopic airbag, and both ends of the airbag are respectively connected to the other end of the connecting passage in the sliding member and the fluid speed limiter. The telescopic airbag, the connecting passage, and the switch cap are sequentially connected. A positioning hole is provided on the side wall of the housing, and the limit switch is connected in this positioning hole to position the sliding member when it reaches this location. At this time, the telescopic airbag is in a compressed state.

[0012] In some typical embodiments, the limit switch has an inverted "U" shaped structure with inwardly protruding locking points on its two side walls. These locking points can enter the receiving cavity through the positioning hole to position the sliding member.

[0013] In some typical embodiments, the upper surface of the locking point is a sloped or curved surface, which makes it easier to pull the limit switch out of the positioning hole.

[0014] In some typical embodiments, the limit switch has a gripping portion on its top to facilitate gripping and operating the limit switch.

[0015] In some typical embodiments, the outer wall of the sliding member has a baffle that can engage with the locking point to achieve positioning.

[0016] In some typical embodiments, the sliding member has a first slot so that the sliding member and the piston rod of the syringe disposed in the receiving cavity are engaged.

[0017] In some typical embodiments, the head end of the housing has an opening groove so that when the syringe is installed, its nipple enters the opening groove and locks the syringe in place.

[0018] In some typical embodiments, the connection passage in the fluid speed limiter is detachably snapped into the tail end of the housing.

[0019] In some typical embodiments, a second slot is provided in the receiving cavity to increase the stability of the syringe.

[0020] Compared with the prior art, this disclosure has the following beneficial effects:

[0021] First, this disclosure provides a fluid flow limiter that, through the setting of a specially structured limiting plate and an adjusting plate, can regulate the flow rate of the fluid, thereby controlling the reset time of the compressed telescopic balloon and thus controlling the automatic injection time. This achieves the goal of single-use infusion without the need for supervision, eliminating the need for complex and costly micro-pumps and saving medical resources and manpower. This is because the surface of the limiting plate of the aforementioned fluid flow limiter has a through-hole area formed by a concentrated distribution of several through holes. These through holes allow fluid to pass through while also limiting the flow rate. By rotating the adjusting plate to change the overlap area between its notch and the through-hole area, the number of through holes aligned with the notch can be changed. These through holes are the part that allows fluid to pass through, while other through holes are blocked and closed by the adjusting plate, preventing fluid from passing through. This allows for convenient and quick modification of the area of ​​through holes that allow fluid to pass through, thereby changing the fluid flow rate.

[0022] Secondly, this disclosure provides an automatic infusion device that utilizes the characteristics of the aforementioned fluid rate limiter to achieve a timing function. Furthermore, this device, by leveraging the fluid rate limiter's ability to regulate the flow of fluid (air), can delay the reset time of the compressed telescopic bladder, thereby controlling the automatic injection time. This is because when the telescopic bladder is compressed, the air within it is expelled through the fluid rate limiter, and to reset, air needs to re-enter the inner cavity of the telescopic bladder from the fluid rate limiter. This disclosure utilizes this reset characteristic of the telescopic bladder and designs the aforementioned fluid rate limiter to control the airflow rate entering the telescopic bladder, thereby controlling the reset time of the telescopic bladder and thus controlling the injection time of the syringe connected to the sliding member in the outer shell. Attached Figure Description

[0023] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0024] Figure 1 The following is an exploded view of the fluid speed limiter in the embodiments below.

[0025] Figure 2 The following is a schematic diagram of the structure of the switch cap in the embodiments.

[0026] Figure 3 The following is a schematic diagram of the speed limiter in the embodiments.

[0027] Figure 4 The following is a schematic diagram of the structure of the adjusting plate in the embodiments.

[0028] Figure 5The following is a schematic diagram of the structure of an automatic infusion device with time control function in the embodiments below.

[0029] Figure 6 The following is a schematic diagram of the outer casing in the embodiments.

[0030] Figure 7 The following is a schematic diagram of the sliding component in the embodiments.

[0031] Figure 8 The following is a schematic diagram of the sliding member and trigger in the embodiments.

[0032] Figure 9 The following is a schematic diagram of the limit switch in the embodiments.

[0033] Figure 10 The following is a schematic diagram of the structure of the telescopic airbag in the embodiments below.

[0034] The markings in the diagram represent: 1-Switch cap, 101-Annular positioning element, 102-Connecting rod; 2-Speed ​​limiter, 201-Through hole; 3-Adjusting plate, 301-Notch; 4-Knob, 401-Handle, 402-Shaft; 5-Connecting passage; 6-Gasket; 7-Outer shell, 701-Receiving cavity, 702-Positioning hole, 703-Opening slot, 704-Second slot, 705-Slide rail; 8-Sliding element, 801-Baffle, 802-First slot; 9-Trigger; 10-Limit switch, 1001-Clutch point, 1002-Grip part; 11-Telescopic airbag; 12-Injector. Detailed Implementation

[0035] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this disclosure. Unless otherwise specified, all technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0036] For ease of description, the terms "up," "down," "left," and "right" appearing in this disclosure only indicate that they correspond to the up, down, left, and right directions of the accompanying drawings themselves. They do not limit the structure and are merely for the purpose of facilitating and simplifying the description of this disclosure. They do not indicate or imply that the device or component referred to needs to have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. The oropharyngeal airway of this disclosure will now be further described in conjunction with the accompanying drawings and specific methods.

[0037] refer to Figures 1 to 5 Example of a fluid speed limiter, comprising: a switch cap 1, a speed limiter 2, an adjusting plate 3, a knob 4, and a connecting passage 5. Wherein:

[0038] The switch cap 1 has a cylindrical structure, i.e., it has a cylindrical inner cavity to facilitate the installation of the speed limiter 2 and the adjusting plate 3. Therefore, the external structure of the switch cap 1 can be any suitable structure such as cylindrical, prismatic, or elliptical cylinder, as long as the switch cap 1 has the cylindrical inner cavity required to install the circular speed limiter 2 and adjusting plate 3.

[0039] As described above, both the speed limiter 2 and the adjusting plate 3 are circular plates, made of materials such as metal or hard plastic. Polytetrafluoroethylene (PTFE) has a low coefficient of friction and self-lubricating properties, facilitating the rotation of the adjusting plate 3 on the surface of the speed limiter 2. The speed limiter 2 and the adjusting plate 3 are stacked within the cylindrical inner cavity, with their central axes coinciding, thereby dividing the cylindrical inner cavity into a specific distribution.

[0040] The surface of the speed limiter 2 has a through-hole area formed by a concentrated distribution of several through holes 201, such as Figure 3 As shown, in this embodiment, the through-hole area is semi-circular, meaning half the area of ​​the speed limiter 2 is the through-hole area, and the through holes 201 are evenly distributed within this through-hole area. (Reference) Figure 4 The adjusting piece 3 has an arc-shaped notch 301 on its surface, and the area of ​​the notch 301 is larger than the diameter of a single through hole 201. The diameter of the through hole 201 can be designed as needed, and will not be described in detail in this embodiment. It should be understood that the through hole 201 does not have to be a round hole; it can also be a square hole, an elliptical hole, etc., because the function of the through hole 201 is to allow fluids such as air to pass through, and the specific shape of the through hole 201 does not substantially affect the achievement of the above purpose.

[0041] Further, refer to Figure 2 The switch cap 1 has an annular positioning element 101 at one end. The annular positioning element 101 is fixedly connected to the switch cap 1 via four connecting rods 102, which are radially distributed to allow air to pass between them. One end of the knob 4 passes through the annular positioning element 101 and connects to the adjusting plate 3, and the knob 4 can rotate within the annular positioning element 101. Specifically, refer to... Figure 1 The knob 4 includes a handle 401 and a rotating shaft 402. The handle 401 is located outside the switch cap 1. One end of the rotating shaft 402 is connected to the handle 401, and the other end passes through the annular positioning member 101 and connects to the adjusting plate 3. This allows the adjusting plate 3 to rotate by rotating the knob 4, thereby aligning the notch 301 on the adjusting plate 3 with the through-hole area on the speed limiter 2, allowing air to pass through. By changing the degree of overlap, the airflow rate can be controlled.

[0042] refer to Figure 1The connecting passage 5 is a tubular structure with an external thread at one end and an internal thread at one end of the switch cap 1. The two are connected as one unit by the thread, and the connecting passage 5 communicates with the inner cavity of the switch cap 1 to facilitate the flow of the connecting passage 5. At the same time, the end face of the connecting passage 5 entering the switch cap 1 presses the speed limiter 2 and the adjusting piece 3 against the inner surface of the annular positioning member 101, thereby assembling the speed limiter 2 and the adjusting piece 3 together. Furthermore, after the speed limiter 2 and the adjusting piece 3 are stacked and arranged in the inner cavity of the switch cap 1 and pressed against the inner surface of the annular positioning member 101, adhesive can be applied from one end of the connecting passage 5 to the edge of the speed limiter 2 to fix it to the inner wall of the inner cavity of the switch cap 1. Then, one end of the connecting passage 5 is connected to the port of the switch cap 1, and the connecting passage 5 and the handle 401 are respectively distributed at both ends of the switch cap 1. At this time, the end of the connecting passage 5 entering the switch cap 1 can contact the speed limiter 2 or not.

[0043] Continue to refer to Figure 1 In some other typical embodiments, a gasket 6 is provided between the connecting passage 5 and the speed limiter 2, thereby enabling the connecting passage 5 to better seal the edge of the speed limiter 2 and prevent air leakage. Furthermore, a gasket 6 can also be provided between the adjusting piece 3 and the annular positioning member 101, thereby providing better sealing between the adjusting piece 3 and the annular positioning member 101 and preventing air leakage.

[0044] In the above embodiment, the speed limiter changes the overlap area between the notch 301 and the through-hole area by rotating the adjusting plate 3, thereby changing the number of through-holes 201 aligned with the notch 301. These through-holes 201 are the parts that allow fluid to pass through, while other through-holes 201 are blocked and closed by the adjusting plate 3, preventing fluid from passing through. This allows for convenient and quick changes in the area of ​​the through-hole area that allows fluid to pass through, thereby changing the fluid flow rate. Combined with the compressed telescopic balloon 11 described below, it can cleverly control the time for automatic injection, achieving the goal of single-use infusion without the need for on-site supervision, thus eliminating the need for complex and costly micro-infusion pumps and saving medical resources and manpower.

[0045] Specifically, refer to Figures 5 to 10 The following embodiments illustrate an automatic infusion device with timing control function, including: a housing 7, a sliding member 8, a trigger 9, a limit switch 10, a telescopic airbag 11, and the fluid rate limiter exemplified in the above embodiments. Wherein:

[0046] refer to Figure 6The outer casing 7 is a rectangular box with an open upper port for installing other components. It should be understood that a cover may also be provided, and the cover can be detachably fixed to the upper port of the outer casing 7 using snap-fit ​​devices, thereby enclosing the components installed in the outer casing 7. It should be understood that, considering the convenience of installing the syringe 12 into the receiving cavity 701 of the outer casing 7, the cover may be omitted. Furthermore, the head end of the outer casing 7 has an opening groove 703 so that when the syringe 12 is installed, its nipple enters the opening groove 703 and engages with the syringe 12.

[0047] refer to Figure 7 The sliding member 8 is a cylindrical structure with a baffle 801 on its outer wall. The sliding member 8 is slidably disposed in the receiving cavity 701 so that it can slide along the receiving cavity 701 under the action of an external driving force, thereby pushing the syringe 12 in the receiving cavity 701 to complete the injection. For this purpose, a trigger 9 is also included. (See reference...) Figure 5 , Figure 6 and Figure 8 The front and rear walls of the outer casing 7 are provided with strip-shaped slides 705. The trigger 9 is located outside the outer casing 7 and is connected to the sliding member 8 through the slide 705. Thus, by moving the trigger 9 in the slide 705, the sliding member 8 can be driven to slide along the receiving cavity 701.

[0048] Furthermore, one end of the sliding member 8 has a first slot 802, so that the sliding member 8 and the piston rod of the syringe 12 disposed in the receiving cavity 701 can be locked together. The middle section of the telescopic airbag 11 is a corrugated tubular structure, and a spring is provided in the telescopic airbag 11 so that it can be reset after being compressed by the sliding member 8 moving towards the right end of the outer shell 7, thereby pushing the sliding member 8 and the piston rod of the syringe 12 to inject. It should be understood that the spring can be directly fitted onto the corrugated part of the telescopic airbag 11 or embedded in the wall surface of the telescopic airbag 11.

[0049] refer to Figure 5The two ends of the telescopic airbag 11 are respectively connected to the other end of the sliding member 8 and the connecting passage 5. The connecting passage 5 engages with the tail end of the outer shell 7, and the telescopic airbag 11 and the knob 4 are located at opposite ends of the switch cap 1. This allows air to enter from the end of the switch cap 1 where the knob 4 is located, and then enter the inner cavity of the telescopic airbag 11 from the other end of the connecting passage 5. Therefore, the inner cavities of the telescopic airbag 11, the connecting passage 5, and the switch cap 1 should be sequentially sealed and connected. After the telescopic airbag 11 is compressed, the air in its inner cavity is expelled. To restore its shape, air needs to re-enter the telescopic airbag 11 through the switch cap 1 and the connecting passage 5. Furthermore, by controlling the flow rate of air through the switch cap 1, the recovery time of the telescopic airbag 11 can be controlled, thereby achieving control of the injection time.

[0050] Furthermore, to facilitate the installation of the syringe 12, which has already drawn up the injection fluid, into the receiving cavity 701 of the housing 7, a positioning mechanism is also provided, which includes a limit switch 10 and a positioning hole 702 formed in the side wall of the housing 7. Specifically, refer to Figure 5 , Figure 6 The positioning holes 702 are located on the front and rear sidewalls of the outer casing 7 and are symmetrically distributed. The positioning holes 702 are located on the right side of the slide rail 705 to facilitate the compression of the telescopic airbag 11 to the bottom before fixing the sliding member 8. (Reference) Figure 9 The limit switch 10 has an inverted "U" shaped structure with inwardly protruding locking points 1001 on its two side walls. When the limit switch 10 is locked onto the side wall of the housing 7, the locking points 1001 enter the receiving cavity 701 through the positioning hole 702 and block the baffle 801 on the sliding member 8, preventing the sliding member 8 from moving back to the left end of the housing 7. At this time, the telescopic airbag 11 is in a compressed and energy-storing state, thereby achieving the positioning of the sliding member 8. Then, the syringe 12, which has already drawn up the injection liquid, is installed in the receiving cavity 701 of the housing 7, and the tail end of the piston rod of the syringe 12 is locked in the first locking groove 802 of the sliding member 8. At the same time, the nipple of the syringe 12 is locked in the opening groove 703 at the left end face of the housing 7. When the limit switch 10 is pulled off the housing 7, the telescopic airbag 11 begins to reset and pushes the sliding member 8 to the left (see reference). Figure 5 Then, the piston rod of the syringe 12 is squeezed to inject the solution.

[0051] Continue to refer to Figure 5 In some other typical embodiments, the upper surface of the locking point 1001 is a slope or an arc surface, which makes it easier to pull the limit switch 10 out of the positioning hole 702 using the slope or arc surface.

[0052] Continue to refer to Figure 5 In some typical embodiments, the limit switch 10 has a gripping portion 1002 on its top to facilitate gripping the limit switch 10 for operation.

[0053] Continue to refer to Figure 5 and Figure 6 In some typical embodiments, a second slot 704 is provided in the receiving cavity 701 to increase the stability of the syringe 12.

[0054] The automatic infusion device of the above embodiment utilizes the characteristic of the fluid rate limiter to regulate the airflow, delaying the reset time of the compressed telescopic airbag 11, thereby controlling the automatic injection time. This is because when the telescopic airbag 11 is compressed, the air inside is discharged through the fluid rate limiter, and to reset, air needs to re-enter the inner cavity of the telescopic airbag 11 from the fluid rate limiter. This disclosure utilizes this reset characteristic of the telescopic airbag 11 and designs the aforementioned fluid rate limiter to control the airflow rate entering the telescopic airbag 11, thereby controlling the reset time of the telescopic airbag 11, which in turn controls the injection time of the syringe connected to the sliding member in the outer shell.

[0055] Finally, it should be noted that any modifications, equivalent substitutions, or improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure. Although the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. An automatic infusion device with time control function, characterized in that, include: The system comprises a housing, a sliding component, a trigger, a limit switch, a telescopic airbag, and a fluid speed limiter; wherein: the sliding component is slidably disposed within the housing cavity of the housing; the trigger is connected to the sliding component via a slide rail on the outer wall of the housing; and the fluid speed limiter is connected to the tail end of the housing; the telescopic airbag contains a spring, and both ends of the telescopic airbag are respectively connected to the other end of the connecting passage in the sliding component and the fluid speed limiter, and the telescopic airbag, the connecting passage, and the switch cap are sequentially connected; the housing side wall has a positioning hole, and the limit switch is connected in the positioning hole and can position the sliding component when it reaches this point, at which time the telescopic airbag is in a compressed state; The fluid speed limiter includes: a switch cap, a speed limiter plate, an adjusting plate, a knob, and a connecting passage; wherein: the switch cap has a cylindrical inner cavity, the speed limiter plate and the adjusting plate are both circular plates, and are stacked and separated within the cylindrical inner cavity; the surface of the speed limiter plate has a through-hole area formed by a plurality of through holes distributed in a concentrated manner, and the adjusting plate has a notch, the notch being larger than the size of the through holes; one end of the knob enters the cylindrical inner cavity of the switch cap from one port and connects to the adjusting plate, the other end of the knob being located outside the port of the switch cap; one end of the connecting passage is connected to the other port of the switch cap, and sequentially presses the speed limiter plate, the adjusting plate, and the knob into the switch cap; One end of the switch cap has an annular positioning element, which is fixedly connected to the switch cap via a connecting rod; one end of the knob passes through the annular positioning element and is connected to the adjusting plate, and the knob can rotate within the annular positioning element; the connecting passage presses the speed limiter, adjusting plate, and knob sequentially onto the annular positioning element. The connection passage is threaded into the other end port of the switch cap; The connection path has a channel that communicates with the inner cavity of the switch cap.

2. The automatic infusion device with time control function according to claim 1, characterized in that, The knob includes a handle and a rotating shaft; wherein: the handle is located outside the switch cap, one end of the rotating shaft is connected to the handle, and the other end passes through the annular positioning member and is connected to the adjusting plate.

3. The automatic infusion device with time control function according to claim 1, characterized in that, A gasket is provided between the connecting passage and the speed limiter.

4. The automatic infusion device with time control function according to claim 1, characterized in that, The limit switch has an inverted "U" shaped structure with inwardly protruding locking points on its two side walls. These locking points can enter the receiving cavity through the positioning hole to position the sliding component. The upper surface of the checkpoint is a slope or an arc surface; The limit switch has a gripping part on its top.

5. The automatic infusion device with time control function according to claim 4, characterized in that, The outer wall of the sliding member has a baffle that can be engaged with the locking point to achieve positioning; or, the sliding member has a first locking groove.

6. The automatic infusion device with time control function according to claim 1, characterized in that, The head end of the outer shell has an opening groove, through which the nipple of the syringe installed in the receiving cavity extends to the outside of the outer shell; the piston rod of the syringe is engaged in the opening groove; a second retaining groove is provided in the receiving cavity.

7. The automatic infusion device with time control function according to any one of claims 1-6, characterized in that, The connecting passage in the fluid speed limiter is detachably snapped into the tail end of the housing.

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