Microinfusion devices, microinfusion assemblies, and methods for their control

Abstract

The present application relates to a kind of microinfusion device, microinfusion assembly and its control method.The microinfusion assembly includes peristaltic mechanism, encoder and controller.In operation, when detecting gap is rotated to opposite with the fixed detection part, fixed detection part senses detection gap, and extrusion mechanism synchronously completes current infusion cycle, i.e.at the end time of previous infusion cycle and the initial time of next infusion cycle at this time.In addition, when fixed detection part senses detection gap, controller sends start or stop signal to the driving mechanism.So according to the detection signal of encoder, the start-stop position of microinfusion assembly can be accurately controlled, so that the infusion amount of each infusion cycle can be accurately controlled when outputting liquid each time or continuously outputting liquid, and the actual liquid output amount is an integer multiple of the infusion amount of each infusion cycle, so that the actual liquid output amount can ensure high accuracy.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a microinfusion device, a microinfusion assembly, and a control method thereof. Background Technology

[0002] In the field of microinfusion, microinfusion devices, such as those using infusion pumps, are used to deliver fluids. However, existing microinfusion devices still have discrepancies between the actual and theoretical fluid output, failing to meet practical accuracy requirements. Furthermore, most microinfusion devices suffer from unstable baseline pressure readings in the pipeline, leading to false alarms and missed alarms related to pressure infusion products. Summary of the Invention

[0003] This application provides a microinfusion device, a microinfusion assembly, and a control method thereof to solve one or more technical problems in the prior art.

[0004] The technical solution is as follows: A microinfusion assembly, the microinfusion assembly comprising:

[0005] A peristaltic mechanism, comprising a drive mechanism, a cam mechanism, and a squeezing mechanism, wherein the drive mechanism drives the cam mechanism to rotate, and the squeezing mechanism periodically changes the cross-sectional area of ​​the pipeline as the cam mechanism rotates;

[0006] The encoder includes a fixed detection unit and a code disk, the code disk rotating synchronously with the cam mechanism, the code disk having a detection notch, the fixed detection unit being used to sense the detection notch; the squeezing mechanism being used to synchronously complete the current infusion cycle when the detection notch rotates to be opposite to the fixed detection unit;

[0007] The controller is electrically connected to the drive mechanism and the fixed detection unit respectively; the controller is used to send a start or stop signal to the drive mechanism when the detection notch rotates to be opposite to the fixed detection unit.

[0008] In one embodiment, the number of detection gaps is at least two.

[0009] In one embodiment, at least two of the detection notches are arranged at equal intervals along the circumference on the code disk.

[0010] In one embodiment, the cam mechanism includes a rotating shaft, and a first cam, a pressing cam, and a second cam sequentially connected to the rotating shaft; the pressing mechanism includes a first pressing assembly, a pressing assembly, and a second pressing assembly; the first cam, the pressing cam, and the second cam respectively abut against the first pressing assembly, the pressing assembly, and the second pressing assembly.

[0011] In one embodiment, the first cam has a first raised surface and a first concave surface connected to the first raised surface on its circumferential outer edge; the second cam has a second raised surface and a second concave surface connected to the second raised surface on its circumferential outer edge; the number of the first raised surface, the first concave surface, the second raised surface and the second concave surface are all equal to the number of the detection notches.

[0012] In one embodiment, when the detection notch is rotated to be opposite to the fixed detection part, the middle position of the first concave surface abuts against the first pushing component, and the middle position of the second convex surface abuts against the second pushing component.

[0013] In one embodiment, when the detection notch is rotated to be opposite to the fixed detection part, the head of the first protruding surface abuts against the first pushing component, and the tail of the second protruding surface abuts against the second pushing component.

[0014] In one embodiment, there are at least two first protruding surfaces and at least two first concave surfaces, and the first protruding surfaces and the first concave surfaces are alternately arranged; there are at least two second protruding surfaces and at least two second concave surfaces, and the second protruding surfaces and the second concave surfaces are alternately arranged.

[0015] In one embodiment, the projections of the first convex surface and the second convex surface onto a plane perpendicular to the rotation axis are both circular arcs or elliptical arcs; the projections of the first concave surface and the second concave surface onto a plane perpendicular to the rotation axis are both circular arcs or elliptical arcs; a chamfer is provided between the first convex surface and the first concave surface; a chamfer is provided between the second convex surface and the second concave surface; and the projection of the extrusion cam onto a plane perpendicular to the rotation axis is elliptical.

[0016] In one embodiment, when the extrusion cam is in a pressing state, the tail of the first protrusion abuts against the first pushing component.

[0017] In one embodiment, the projections of the first protruding surface and the second protruding surface onto a plane perpendicular to the rotation axis have an overlapping area, and the angle corresponding to the overlapping area is 0.5°-5°.

[0018] In one embodiment, the first pressing assembly includes a first abutment, a second abutment, and an elastic buffer; the first abutment is used to press against the pipeline, the second abutment engages with the cam mechanism, and the first abutment is connected to the second abutment through the elastic buffer.

[0019] In one embodiment, the extrusion assembly includes an extrusion block and an elastic connector, the extrusion block engaging with the cam mechanism via the elastic connector.

[0020] A microinfusion device includes the aforementioned microinfusion assembly and an infusion mechanism. The infusion mechanism includes a tubing and a support portion. The tubing is located on the support portion, and a squeezing mechanism is located on one side of the support portion and periodically changes the cross-sectional area of ​​the tubing.

[0021] A control method for a microinfusion device includes the following steps:

[0022] In the startup process, when the fixed detection unit senses the detection gap, the controller controls the drive mechanism to operate.

[0023] The stopping step involves determining whether a preset number of infusion cycles have been run based on the number of detected gaps. When it is determined that a preset number of infusion cycles have been run and the fixed detection unit senses the detection gaps, the controller controls the drive mechanism to stop operating.

[0024] In one embodiment, the control method further includes: obtaining the infusion volume after running one infusion cycle in advance; the controller, after receiving the target infusion volume, determines the number of infusion cycles to be run; the number of infusion cycles to be run constitutes the preset number of infusion cycles.

[0025] In one embodiment, the control method further includes a pressure detection step, wherein when the fixed detection part is opposite to the detection notch and the cam mechanism stops rotating, the pressure of the pipeline is detected by a pressure sensor to obtain a base pressure value, and a preset range is obtained based on the base pressure value.

[0026] In one embodiment, the control method further includes an alarm step, wherein when the pressure value detected by the pressure sensor exceeds a preset range, the alarm is controlled to perform an alarm action.

[0027] In one embodiment, the control method further includes: when the fixed detection unit does not sense the detection gap, the controller controls the drive mechanism to move until the fixed detection unit senses the detection gap, and then executes the start-up step.

[0028] In the aforementioned microinfusion device, microinfusion assembly, and control method, during operation, when the detection notch rotates to be opposite the fixed detection unit, the fixed detection unit senses the detection notch, and the squeezing mechanism synchronously completes the current infusion cycle. This occurs at the end of the previous infusion cycle and the beginning of the next infusion cycle. Furthermore, when the fixed detection unit senses the detection notch, the controller sends a start or stop signal to the drive mechanism. Thus, based on the encoder's detection signal, the start and stop positions of the microinfusion assembly can be precisely controlled, ensuring accurate control of the infusion volume per infusion cycle during each pulse or continuous liquid output. The actual liquid output volume is an integer multiple of the infusion volume for each infusion cycle, guaranteeing high precision in the actual liquid output. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the working state of a microinfusion device in the start / stop position according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of another working state of the microinfusion device according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the code disk mounted on the rotating shaft according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the cam mechanism, the first pressing component, the extrusion component, and the second pressing component according to an embodiment of the present invention;

[0035] Figure 5 for Figure 4 Another perspective structural diagram;

[0036] Figure 6 This is a schematic diagram of the cam mechanism according to an embodiment of the present invention from one perspective;

[0037] Figure 7 This is a schematic diagram of the first pushing component according to one embodiment of the present invention from one perspective.

[0038] Figure 8 This is a schematic diagram of the first pushing component according to an embodiment of the present invention from another perspective.

[0039] Figure 9 This is a schematic diagram of the cam mechanism, the first pressing component, the extrusion component, and the second pressing component according to another embodiment of the present invention.

[0040] 10. Microinfusion assembly; 11. Peristaltic mechanism; 111. Frame; 112. Drive mechanism; 1121. Motor; 1122. First transmission wheel; 1123. Second transmission wheel; 1124. Transmission element; 113. Cam mechanism; 1131. Rotating shaft; 11311. First step; 11312. Second step; 1132. First cam; 11321. First raised surface; 11322. First concave surface; 1133. Extrusion cam; 1134. Second cam; 11341. Second raised surface; 1134 2. Second concave surface; 114. First pushing assembly; 1141. First abutting member; 11411. Pressure-stopping plate; 11412. Housing; 11413. Movable hole; 1142. Second abutting member; 11421. Abutting part; 11422. Mounting part; 11423. Snap-fit ​​part; 115. Extrusion assembly; 116. Second pushing assembly; 12. Encoder; 121. Code disk; 1211. Detection notch; 122. Fixed detection part; 13. Pressure sensor; 20. Infusion mechanism; 21. Pipeline; 22. Support part. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] Traditional micro-infusion devices can have various structural types. In existing technologies, although the driver sends a certain number of pulses to the motor, and the actuator completes the required number of pulses according to the driver's instructions, the actual output fluid volume still differs from the theoretical output volume, failing to meet actual accuracy requirements. Furthermore, when the infusion product's tubing becomes abnormally blocked, the pressure in the tubing increases sharply, necessitating timely and reliable alarm prompts. The inventors discovered that the discrepancy between the actual and theoretical fluid output volumes in existing micro-infusion devices stems from the inability to precisely control the pump mechanism's start and stop positions. This leads to differences between the actual and theoretical fluid output volumes during each pulse or continuous output, and these differences accumulate with continuous use, gradually increasing the fluid output error to an unacceptable level. Moreover, this error is not easily detected during the use of existing micro-infusion devices.

[0043] For the reasons mentioned above, the present invention provides a microinfusion device, a microinfusion component and a control method thereof, which can improve infusion accuracy and provide a guarantee for safe infusion.

[0044] See Figures 1 to 3 , Figure 1 A schematic diagram of the microinfusion device according to an embodiment of the present invention in the start / stop position is shown. Figure 2 A schematic diagram of a microinfusion device according to an embodiment of the present invention in another operating state is shown. Figure 3 A schematic diagram of the encoder 121 mounted on a rotating shaft 1131 according to an embodiment of the present invention is shown. One embodiment of this application provides a microinfusion device, which includes a microinfusion assembly 10 and an infusion mechanism 20. The infusion mechanism 20 includes a tubing 21 and a support 22. The tubing 21 is located on the support 22, and a squeezing mechanism is located on one side of the support 22 and periodically changes the cross-sectional area of ​​the tubing 21. Specifically, the squeezing mechanism includes a first pushing assembly 114, a squeezing assembly 115, and a second pushing assembly 116. The first pushing assembly 114, the squeezing assembly 115, and the second pushing assembly 116 are located on one side of the tubing 21 and along the liquid flow direction of the tubing 21 (e.g., ...). Figure 1 Set them sequentially (in the direction indicated by arrow S in the image).

[0045] The microinfusion assembly 10 includes a peristaltic mechanism 11, an encoder 12, and a controller. The peristaltic mechanism 11 includes a drive mechanism 112, a cam mechanism 113, and a squeezing mechanism. The drive mechanism 112 drives the cam mechanism 113 to rotate, and the squeezing mechanism periodically changes the cross-sectional area of ​​the tubing 21 as the cam mechanism 113 rotates. Specifically, the peristaltic mechanism 11 also includes a frame 111. The cam mechanism 113 is rotatably connected to the frame 111, and the squeezing mechanism is movably mounted on the frame 111. The encoder 12 includes a fixed detection unit 122 and a code disk 121. The code disk 121 rotates synchronously with the cam mechanism 113. Specifically, in some embodiments, the cam mechanism is coaxially connected, and the code disk 121 is coaxially connected to the cam mechanism 113. In other embodiments, each cam of the cam mechanism is connected to a drive shaft, and synchronous rotation of the code disk 121 and the cams is also possible. The encoder 121 has at least one detection notch 1211. A fixed detection unit 122 is used to sense the detection notch 1211. When the fixed detection unit 122 is aligned with the detection notch 1211, the squeezing mechanism synchronously completes the current infusion cycle. The controller is electrically connected to the drive mechanism 112 and the fixed detection unit 122. When the detection notch 1211 rotates to be aligned with the fixed detection unit 122, the controller sends a start or stop signal to the drive mechanism 112.

[0046] The microinfusion device can be used for either pulsed infusion, which means that under the control of the controller, it runs multiple infusion cycles at preset time intervals, i.e., each pulse runs for, for example, 1, 2, 3 or other number of infusion cycles; or it can be used for continuous infusion, which means that under the control of the controller, it runs multiple infusion cycles continuously.

[0047] For each infusion cycle, the infusion stops at both the start and stop times, and the volume of fluid delivered remains constant under the condition that the fluid pressure in pipeline 21 is the same. As an example, let's consider... Figures 4 to 6 Taking the compression mechanism shown as an example, it is found that when the rotating shaft 1131 rotates 360°, two infusion cycles are completed, as follows. Figure 9As shown. During initialization, the detection notch 1211 sensed by the encoder 12 is defined as the initial position, and the rotating shaft 1131 is at 0°. When the drive mechanism 112 receives a pulse command from the controller, the drive mechanism 112 drives the cam mechanism 113 to rotate, which drives the coaxial code disk 121 to rotate synchronously (e.g., rotate 180°). The encoder 12 rotates at a constant speed from the initial detection notch 1211 position to the next detection notch 1211 position, completing the infusion action of one infusion cycle. The first pushing assembly 114 corresponds to the suction port of the local chamber of the pipeline 21, and completes a movement from lifting-pressing-pressing-pressing-lifting in one infusion cycle; the second pushing assembly 116 corresponds to the discharge port of the local chamber of the pipeline 21, and completes a movement from pressing-pressing-lifting-pressing-pressing in one infusion cycle; the squeezing assembly 115 is used to squeeze the liquid out of the local chamber of the pipeline 21, and completes a movement from half-pressing-lifting-half-pressing-pressing-half-pressing in one infusion cycle. This cycle repeats sequentially according to the infusion cycle.

[0048] That is, at the beginning and end of the infusion cycle, the first pushing component 114 is in the first extreme position, and the part of the tubing 21 corresponding to the first pushing component 114 is loosened to the maximum extent, that is, in the lifting state; the second pushing component 116 is in the second extreme position, and the second pushing component 116 is in the position of fully compressing the tubing 21, that is, in the compressed state; the squeezing component 115 is in the semi-compressed state.

[0049] Furthermore, it should be noted that the first pushing component 114 should be raised after the squeezing component 115 is pressed, so that the liquid before the first pushing component 114 is drawn in by the negative pressure formed by the pipeline 21. After a certain amount of liquid is drawn in, the first pushing component 114 correspondingly changes to pressing, at which time the second pushing component 116 gradually changes from pressing to raising, and the squeezing component 115 gradually changes from raising to pressing, thereby squeezing out a certain amount of liquid that has been drawn in.

[0050] Compared to some embodiments, although the encoder 121 has a notch for recording the rotation angle after the motor 1121 is driven, the notch does not correspond to a specific state of the infusion component, and the increase in infusion volume does not increase uniformly with the increase in rotation angle. Therefore, directly calculating the completed infusion volume based on the notch position is not realistic. However, some embodiments of this application cleverly avoid this problem by making the start and stop positions correspond to a specific state of the infusion component each time, so that the infusion task can be completed as long as it reaches an integer multiple of the infusion cycle. Specifically, when the micro-infusion component 10 is working, when the detection notch 1211 rotates to be opposite the fixed detection unit 122, the fixed detection unit 122 senses the detection notch 1211, and the squeezing mechanism synchronously completes the current infusion cycle. That is, at this time, it is at the end of the previous infusion cycle and the beginning of the next infusion cycle. In addition, when the fixed detection unit 122 senses the detection notch 1211, the controller sends a signal to the drive mechanism 112 to start or stop working. Based on the detection signal from the encoder 12, the start and stop positions of the micro-infusion component 10 can be precisely controlled, so that the infusion volume of each infusion cycle can be precisely controlled when the liquid is output with each pulse or when the liquid is continuously output. The actual liquid output volume is an integer multiple of the infusion volume of each infusion cycle, thus ensuring high accuracy of the actual liquid output volume.

[0051] In one embodiment, the encoder 12 may include, but is not limited to, an optical encoder 12, a magnetic encoder 12, etc. The specific encoder may be flexibly adjusted and set according to actual needs, and is not limited here.

[0052] In one embodiment, the number of detection notches 1211 is at least two. Accordingly, the cam mechanism 113 is designed such that when the motor 1121 drives the cam mechanism 113 to rotate one revolution (360°), there are at least two infusion cycles corresponding to the at least two detection notches 1211, thus ensuring precise control of the start and stop positions of each infusion cycle. Furthermore, since the motor 1121 drives the cam mechanism 113 to rotate one revolution, there are at least two infusion cycles, thereby increasing the infusion rate.

[0053] As an optional solution, the detection gap 1211 is set to one, and accordingly, the cam mechanism 113 is designed with the specific structure of one rotation to complete one infusion cycle.

[0054] In one embodiment, the at least two detection notches 1211 can be arranged at equal intervals along the circumference on the code disk 121, or they can be arranged at non-equal intervals along the circumference on the code disk 121. The specific arrangement can be flexibly adjusted and set according to actual needs.

[0055] In one embodiment, at least two detection notches 1211 are arranged at equal intervals along the circumference on the encoder 121. Thus, the motor 1121 operates at a uniform speed, ensuring the same infusion volume and time for each infusion cycle. Furthermore, this simplifies the structure of the cam mechanism 113, making it easier to design and manufacture.

[0056] When there are two detection notches 1211, and they are arranged at equal intervals along the circumference on the encoder 121, the cam mechanism 113 can rotate 180° to move from the position of one detection notch 1211 to the position of another detection notch 1211, thus completing one infusion cycle. When there are three detection notches 1211, and they are arranged at equal intervals along the circumference on the encoder 121, the cam mechanism 113 can rotate 120° to move from the position of one detection notch 1211 to the position of another adjacent detection notch 1211, thus completing one infusion cycle.

[0057] Please see Figure 1 , Figure 4 and Figure 5 , Figure 4 This diagram illustrates the structure of a cam mechanism 113, a first pressing assembly 114, a pressing assembly 115, and a second pressing assembly 116 according to an embodiment of the present invention. Figure 5 It shows Figure 4 Another perspective structural diagram. In one embodiment, the cam mechanism 113 includes a rotating shaft 1131, and a first cam 1132, a pressing cam 1133, and a second cam 1134 sequentially connected to the rotating shaft 1131. The first cam 1132, the pressing cam 1133, and the second cam 1134 respectively abut against the first pressing assembly 114, the pressing assembly 115, and the second pressing assembly 116.

[0058] In one embodiment, the first cam 1132 has a first protruding surface 11321 and a first concave surface 11322 connected to the first protruding surface 11321 on its circumferential outer edge. The second cam 1134 has a second protruding surface 11341 and a second concave surface 11342 connected to the second protruding surface 11341 on its circumferential outer edge. The number of each of the first protruding surface 11321, the first concave surface 11322, the second protruding surface 11341, and the second concave surface 11342 is equal to the number of detection notches 1211.

[0059] Compared to some embodiments, although the encoder 121 has notches for recording the rotation angle after the motor 1121 is driven, these notches do not correspond to specific states of the infusion component. When the infusion component is stopped by matching any notch, the contact state of the infusion component cannot be guaranteed. Therefore, it cannot be guaranteed that the infusion component will not slip against the infusion tubing 21 at the start / stop position. If this situation is not avoided, infusion errors will occur with each start and stop operation. Over time, these errors will accumulate to a non-negligible level, potentially leading to medical problems. Some embodiments of this application cleverly avoid this technical problem through design; please refer to [link to relevant documentation]. Figure 1 , Figures 4 to 6 , Figure 6 This diagram illustrates a view of the cam mechanism 113 according to an embodiment of the present invention, when it is in the start / stop position (e.g., ...). Figure 6 When the detection notch 1211 rotates to be opposite the fixed detection part 122, the middle position of the second protruding surface 11341 abuts against the second pushing component 116, so that the second pushing component 116 is in a pressed state that presses against the pipe 21 below it, that is, in the second limit position. At this time, due to its own elasticity and the liquid pressure inside the pipe 21, the pipe 21 generates a reaction force on the second pushing component 116 in the pressed state, forcing the second pushing component 116 to have a lifting tendency. The reaction force generated by the pipe 21 on the second pushing component 116 is balanced with the downward force exerted on it by the rotating shaft 1131, and the entire mechanism is in a balanced state. At the same time, the middle position of the first concave surface 11322 abuts against the first pushing component 114, that is, the first pushing component 114 is in a raised state, in the first limit position. Since the middle position of the first concave surface 11322 plays a good positioning and balancing role when it abuts against the first pushing component 114, it can avoid the reduction in the accuracy of the infusion volume caused by the cam mechanism 113 rotating a certain angle more at the start and stop positions. In other words, it can ensure the precise control of the cam mechanism 113 at the start and stop positions, thereby ensuring the infusion accuracy.

[0060] Please see Figure 1 , Figure 2 and Figure 4 Furthermore, the cam mechanism 113 continues to rotate a certain angle from the start / stop position. When the middle position of the first protrusion 11321 abuts against the first pushing assembly 114, the first pushing assembly 114 presses against the pipe 21 below it (e.g., Figure 2 (as shown); at the same time, the middle position of the second concave surface 11342 abuts against the second pushing component 116, so that the second pushing component 116 is in a raised state, releasing the pipe 21 below it.

[0061] Of course, in another embodiment, please refer to Figure 9 , Figure 9 This diagram illustrates the structure of the cam mechanism 113, the first pressing assembly 114, the extrusion assembly 115, and the second pressing assembly 116 according to another embodiment. Figure 9 The structure shown is in the state of the start or end of an infusion cycle, i.e., in the start / stop position. When the detection notch 1211 rotates to be opposite the fixed detection part 122, the head of the first protrusion 11321 abuts against the first pushing assembly 114, and the tail of the second protrusion 11341 abuts against the second pushing assembly 116. Relative to... Figure 6 The difference lies in, Figure 9 The start and stop positions of the extrusion mechanism shown are different. Figure 6 The start and stop positions of the extrusion mechanism are shown.

[0062] In addition, please refer to the following: Figure 9 The positions indicated by 0° or 180° represent the start and stop positions of the squeezing mechanism, which are the start and end times of an infusion cycle, respectively. At these positions, the first pushing assembly 114 and the second pushing assembly 116 are in a pressing state, while the squeezing assembly 115 is in a lifting state. Specifically, the first pushing assembly 114 completes a movement from pressing-pressing-pressing-lifting-pressing in one infusion cycle; the second pushing assembly 116 completes a movement from pressing-lifting-pressing-pressing-pressing in one infusion cycle; and the squeezing assembly 115 completes a movement from lifting-half-pressing-pressing-half-pressing-lifting in one infusion cycle. Furthermore, both the first pushing assembly 114 and the second pushing assembly 116 are in a pressing state at the start and stop positions, which reduces energy consumption. Starting and stopping from the convex surface requires less starting force than starting and stopping from the concave surface, thus resulting in a smoother operation. At the same time, the second pressing component 116 tends to rotate from contact with the convex surface to contact with the concave surface, while the first pressing component 114 tends to remain in contact with the convex surface. Since both are fixed on the same shaft, the two sets of forces form a couple, preventing the shaft from wobbling. Thus, the first pressing component 114 and the second pressing component 116 are both in a pressed state when the machine starts and stops, and the pressing of the pipeline 21 will not slip.

[0063] It should be noted that, within one infusion cycle, the tail of the second protrusion 11341 refers to the part on the second protrusion 11341 that is the last to come into contact with the second pushing component 116 along the rotation direction of the rotating shaft 1131; within one infusion cycle, the head of the first protrusion 11321 refers to the part on the first protrusion 11321 that is the first to come into contact with the first pushing component 114 along the rotation direction of the rotating shaft 1131.

[0064] In one embodiment, when the extrusion cam 1133 is in the pressing state, the tail of the first protrusion 11321 abuts against the first pushing assembly 114. Thus, the first pushing assembly 114 will rise after the extrusion assembly 115 presses down, drawing in the liquid preceding the first pushing assembly 114 through the negative pressure formed by the pipe 21. After a certain amount of liquid is drawn in, the first pushing assembly 114 correspondingly changes to pressing down, at which point the second pushing assembly 116 gradually changes from pressing down to lifting, and the extrusion assembly 115 gradually changes from lifting to pressing down, thereby squeezing out a certain amount of the drawn-in liquid.

[0065] Alternatively, the first cam 1132 and the second cam 1134 may have identical or substantially identical shapes, differing only in their mounting angle on the rotation shaft 1131. Specifically, viewed along the axial direction of the rotation shaft 1131, the first cam 1132 and the second cam 1134 have an offset angle, the specific angle of which is set according to the number of infusion cycles per rotation. For example, when one rotation corresponds to two infusion cycles, the offset angle between the first cam 1132 and the second cam 1134 is, for example, 90°.

[0066] Optionally, during an infusion cycle, when one tail of the first protrusion 11321 and the second protrusion 11341 is about to leave the squeezing mechanism, the other head has already pressed against the squeezing mechanism. The projections of the first protrusion 11321 and the second protrusion 11341 on a plane perpendicular to the rotation axis 1131 have an overlapping area. That is, when viewed along the rotation axis 1131, the first cam 1132 and the second cam 1134 have a double-pressing overlapping area, and the angle corresponding to the overlapping area is, for example, 0.5°-5°. Specifically, for example, when the tail of the first protrusion 11321 is about to leave the first pushing assembly 114, the head of the second protrusion 11341 is pressed against the second pushing assembly 116, and the pressing position of the second protrusion 11341 on the second pushing assembly 116 and the starting position of the second protrusion 11341 form a central angle with respect to the center of the cam mechanism 113, for example, 0.5°-5°. And / or, when the tail of the second protruding surface 11341 is about to leave the second pushing assembly 116, the head of the first protruding surface 11321 presses against the first pushing assembly 114, and the pressing position of the first protruding surface 11321 on the first pushing assembly 114 and the starting position of the first protruding surface 11321 form a central angle about the center of the cam mechanism 113, for example, 0.5°-5°. This 0.5°-5° is a safety angle, thereby ensuring that the first pushing assembly 114 or the second pushing assembly 116 is in a pressed state at any time during an infusion cycle, thereby preventing leakage and ensuring infusion accuracy. If it is an elliptical arc, then the first protruding surface 11321 and the second protruding surface 11341 have a double-pressed overlapping area, and the angle corresponding to the overlapping area is, for example, 0.5°-5°, which is the angle between the lines connecting the start and end points of the overlapping area to the center point of the ellipse. Optionally, the safety angle can also be set to any value outside of 0.5°-5° but greater than 0°. There are no specific limitations here, and it can be flexibly set according to actual needs.

[0067] Furthermore, taking the example of performing two infusion cycles with one rotation, please refer to [link to relevant documentation]. Figure 5 and Figure 6 As an example, the central angle corresponding to the first protruding surface 11321 is greater than 90°, and the central angle corresponding to the second protruding surface 11341 is greater than 90°. The central angles of the two can be the same or different. As another example, the central angle corresponding to one of the first protruding surface 11321 and the second protruding surface 11341 is greater than 90°, and the central angle of the other corresponding surface is equal to or less than 90°. When it is less than 90°, it is necessary to ensure that the sum of the central angles of the two corresponding surfaces is greater than 180°.

[0068] Please see Figures 4 to 6In one embodiment, the first cam 1132, the extrusion cam 1133, and the second cam 1134 are integrated with the rotating shaft 1131, for example, by means of forging, die casting, injection molding, or other methods during manufacturing. Alternatively, the first cam 1132, the extrusion cam 1133, and the second cam 1134 can also be fixedly mounted on the rotating shaft 1131, for example, by means of pins, rivets, screws, snap fasteners, adhesives, etc.

[0069] Please see Figures 4 to 6 In one embodiment, there are at least two first protruding surfaces 11321 and first concave surfaces 11322, and the first protruding surfaces 11321 and first concave surfaces 11322 are alternately arranged; there are at least two second protruding surfaces 11341 and second concave surfaces 11342, and the second protruding surfaces 11341 and second concave surfaces 11342 are alternately arranged. Thus, when the drive mechanism 112 drives the cam mechanism 113 to rotate one revolution (360°), at least two infusion cycles can be achieved, thereby increasing the infusion rate.

[0070] Of course, the first protruding surface 11321 and the first concave surface 11322 can each be set to one, and the second protruding surface 11341 and the second concave surface 11342 can also be set to one, that is, the motor 1121 drives the cam mechanism 113 to rotate one revolution, which can realize one infusion cycle.

[0071] Please see Figure 1 , Figures 4 to 6 In one specific embodiment, two of each of the first protruding surface 11321 and the first concave surface 11322 are provided, two of each of the second protruding surface 11341 and the second concave surface 11342 are provided, and two detection notches 1211 are provided. The motor 1121 drives the cam mechanism 113 to rotate, for example, 180° to achieve one infusion cycle, and one rotation can achieve two infusion cycles. In addition, the number of each of the first protruding surface 11321, the first concave surface 11322, the second protruding surface 11341, and the second concave surface 11342 is not too large, so that the cam mechanism 113 has less noise during operation. In other words, it can avoid the large noise caused by setting too many of each of the first protruding surface 11321, the first concave surface 11322, the second protruding surface 11341, and the second concave surface 11342.

[0072] Please see Figure 1 , Figures 4 to 6In one embodiment, the first protruding surface 11321 is an arc or an elliptical arc, and the first concave surface 11322 is an arc or an elliptical arc; a chamfer is provided between the first protruding surface 11321 and the first concave surface 11322; the second protruding surface 11341 is an arc or an elliptical arc, and the second concave surface 11342 is an arc or an elliptical arc; a chamfer is provided between the second protruding surface 11341 and the second concave surface 11342. Thus, during rotation, the cam mechanism 113 can smoothly drive the first pushing assembly 114 and the second pushing assembly 116, and can reduce mechanical noise and wear.

[0073] Please see Figure 1 In one embodiment, the microinfusion assembly 10 further includes a pressure sensor 13 electrically connected to the controller. The pressure sensor 13 is connected to the frame 111 and is used to detect the pressure of the tubing 21 when the fixed detection section 122 is opposite to the detection notch 1211 and the cam mechanism 113 stops rotating.

[0074] Specifically, the pressure sensor 13 detects the downstream section of pipe 21 opposite to the second pushing assembly 116, i.e., as shown below. Figure 1 The left-side section of the second push assembly 116 shown.

[0075] Thus, when the fixed detection unit 122 is opposite to the detection notch 1211, i.e., when it is in the start / stop position of the infusion cycle, the pressure of the pipeline 21 is detected. Since the second push assembly 116 is in tight contact with the pipeline 21, the upstream section of the pipeline (i.e., such as...) can be isolated. Figure 1 The influence of the right-side region of the second push assembly 116 (as shown) on the pressure of the downstream region of the second push assembly 116 can be ensured, thereby guaranteeing the accuracy of pressure detection in the pipeline 21. In other words, it can avoid the defect that the pressure relief plate assembly will be in an unbalanced state at the start and stop positions of each infusion cycle when the start and stop positions are not precisely controlled, which would cause the second push assembly 116 to cause backflow of liquid in the pipeline 21 due to the tension rotation of the pipeline 21, resulting in a reduction in the liquid infusion volume and affecting the infusion accuracy and pressure detection accuracy.

[0076] Furthermore, precise control and fixation of the start and stop positions also solves the problem of the cam mechanism 113 being in an unbalanced state and the uncertain pressing depth of the second pushing component 116 onto the pipeline 21 during each start and stop. After fixing the start and stop positions, the first pushing component 114 is always stopped at its highest lifting position relative to the pipeline 21, i.e., at the first limit position, and the second pushing component 116 is always stopped in the pressing state onto the pipeline 21, i.e., at the second limit position. In this way, the pressure sensor 13 can stably collect the basic pressure value of the pipeline 21. This basic pressure value is relatively certain and stable. Therefore, after defining the preset range of alarm pressure, the pressure alarm can be accurately and stably triggered when the pressure exceeds the preset range, improving the alarm accuracy. In addition, the alarm pressure threshold tends to a stable range, solving the problems of false alarms and missed alarms of pressure alarms. In addition, when the pressure in the pipeline 21 is blocked due to external reasons, the pressure in the pipeline 21 increases sharply in a short period of time, exceeding the alarm pressure threshold, triggering a pressure alarm.

[0077] In one embodiment, the microinfusion assembly 10 also includes an alarm electrically connected to the controller. The controller is used to activate the alarm when the pressure value detected by the pressure sensor 13 exceeds a preset range. Thus, when the baseline pressure value detected by the pressure sensor 13 exceeds the preset range, the alarm will activate accordingly, promptly reminding staff to perform maintenance and prevent blockages in the tubing 21, thereby ensuring infusion accuracy.

[0078] The alarms include, but are not limited to, audible and visual alarms, vibration alarms, voice alarms, displays, etc. The specific alarms can be flexibly adjusted and set according to actual needs, as long as they can serve as a warning.

[0079] The preset range can be flexibly adjusted and set according to actual needs, and is not limited here.

[0080] It should be noted that the preset range in the software can only be stable when the base pressure value of pipeline 21 is stable. This is because the preset range is a relative value of the base pressure value under ideal conditions where the base pressure value remains unchanged, and this relative value is the preset alarm pressure threshold. In other words, only when the base pressure is stable can the conditions for triggering the pressure alarm at the upper level be considered accurate.

[0081] Please see Figure 5 , Figure 7 and Figure 8 , Figure 7 The diagram shows a schematic view of the first pushing assembly 114 according to an embodiment of the present invention. Figure 8A schematic diagram of the first pushing assembly 114 according to an embodiment of the present invention is shown from another perspective. In one embodiment, the first pushing assembly 114 and the second pushing assembly 116 are two identical structures. Taking the first pushing assembly 114 as an example: Optionally, the first pushing assembly 114 includes a first abutting member 1141, a second abutting member 1142, and an elastic buffer member. The first abutting member 1141 is used to press against the pipeline 21, and the second abutting member 1142 abuts against the cam mechanism 113. The first abutting member 1141 is connected to the second abutting member 1142 through the elastic buffer member. Thus, under the drive of the cam mechanism 113, when the first pushing assembly 114 moves towards the pipeline 21 and squeezes the pipeline 21, causing the pipeline 21 to close at the part corresponding to the first pushing assembly 114, the elastic buffer member can undergo elastic deformation, playing a buffering role and preventing overpressure. In other words, the elastic buffer can prevent the current surge caused by excessive compression of the pipe 21 by the first pushing assembly 114 during the compression process. Moreover, by absorbing part of the overpressure, the total overpressure is reduced, thereby reducing pipe 21 losses. In addition, when the cam mechanism 113 lifts, the liquid pressure of the pipe 21 itself can synchronously drive the first pushing assembly 114 to lift upwards for reset.

[0082] Please see Figure 5 , Figure 7 and Figure 8 In one embodiment, the first abutting member 1141 includes a pressure-stopping plate 11411 for pressing against the pipeline 21 and a housing 11412 connected to the pressure-stopping plate 11411. The housing 11412 has an opening at a portion opposite to the pressure-stopping plate 11411, and a movable hole 11413 is provided on the side wall of the housing 11412. The second abutting member 1142 includes an abutting portion 11421 and a mounting portion 11422 disposed opposite to each other. The abutting portion 11421 is used for abutting and engaging with the cam mechanism 113. The mounting portion 11422 extends into the housing 11412 through the opening. The outer wall of the mounting portion 11422 has a locking portion 11423, which is located in the movable hole 11413 and can move along the movable hole 11413. The mounting portion 11422 is connected to the bottom wall of the housing 11412 through an elastic buffer. Thus, on the one hand, the first abutting member 1141 and the second abutting member 1142 are easy to assemble and disassemble; on the other hand, when the elastic buffer shrinks, the locking part 11423 can move accordingly in the movable hole 11413 to ensure operational stability.

[0083] In one embodiment, a pin is provided on the bottom wall of the housing 11412, and the elastic buffer is a spring sleeved on the pin.

[0084] Please see Figure 5In one embodiment, the extrusion assembly 115 includes an extrusion block and an elastic connector, the extrusion block engaging with the cam mechanism 113 via the elastic connector. Thus, the extrusion block and the elastic connector are located inside the frame 111, with the elastic connector, for example, mounted inside the lower cover of the frame 111, one end contacting the lower cover and the other end contacting a groove in the extrusion block. The elastic connector eliminates gaps, provides support for the extrusion block, and ensures that the extrusion block and the cam mechanism 113 are always in contact.

[0085] The frame 111 also includes an upper cover connected to the lower cover, and a cam mechanism 113 is rotatably disposed in the upper cover. The upper cover and the lower cover are detachably connected.

[0086] Please see Figure 1 In one embodiment, the drive mechanism 112 includes a motor 1121 mounted on a frame 111, a first transmission wheel 1122, a second transmission wheel 1123, and a transmission element 1124 connecting the first transmission wheel 1122 and the second transmission wheel 1123. The first transmission wheel 1122 is connected to the power shaft of the motor 1121, and the second transmission wheel 1123 is coaxially connected to the rotating shaft 1131. When the motor 1121 is working, it drives the first transmission wheel 1122 to rotate, and the first transmission wheel 1122 drives the second transmission wheel 1123 to rotate through the transmission element 1124, and the second transmission wheel 1123 correspondingly drives the rotating shaft 1131 to rotate.

[0087] Optionally, the first transmission wheel 1122 and the second transmission wheel 1123 may be, but are not limited to, pulleys, sprockets, gears, etc., and the transmission element 1124 may be configured as a transmission belt corresponding to the pulley, a transmission chain corresponding to the sprocket, etc.

[0088] Please see Figure 1 , Figure 3 , Figure 5 and Figure 6 In one embodiment, the two ends of the rotating shaft 1131 are respectively connected to the code disk 121 and the second transmission wheel 1123. Alternatively, the two ends of the rotating shaft 1131 are respectively provided with a first step 11311 and a second step 11312. The first step 11311 is used to mount the code disk 121 and contacts and engages with the stepped surface of the code disk 121. The second step 11312 is used to mount the second transmission wheel 1123 and contacts and engages with the stepped surface of the second transmission wheel 1123.

[0089] Please see Figure 1 , Figure 3 , Figure 5 and Figure 6In one embodiment, the code disk 121 is a disc-shaped structure with a through hole in the middle and a stepped surface that cooperates with the first step 11311 to install the rotating shaft 1131 and keep the rotating shaft 1131 and the code disk 121 coaxially and synchronously rotate, so that the rotating shaft 1131 and the code disk 121 are fixed and there is no relative rotation.

[0090] The detection notch 1211 on the encoder 121 is used for fixing the detection unit 122 and is also the detection point for fixing the start and stop positions in this case. The start and stop positions of the encoder 121 are defined by sensing the detection notch 1211, which also corresponds to the start and stop positions of the cam mechanism 113, the first push assembly 114 and the second push assembly 116.

[0091] Please see Figure 1 In one embodiment, the fixed detection unit 122 has a U-shaped groove structure, and the horizontal structure at the bottom is soldered to the PCB board. The code disk 121 can rotate in the U-shaped groove. When the notch of the code disk 121 rotates past the fixed detection unit 122 each time, the encoder 12 will feed back the sensing signal of the sensing notch 1211 to the controller to reach the start / stop position; and for the infusion volume statistics, the encoder 12 automatically records and increments by 1.

[0092] Please see Figure 1 In one embodiment, the pressure sensor 13 includes a push rod and a PCB board. The push rod is, for example, a stepped shaft structure with two steps, one end of which contacts a protruding probe on the PCB board, and the other end contacts the pipe 21. When a pressure change is detected in the pipe 21, the push rod will displace, and the electrical signal will be fed back to the controller through the probe on the PCB board, forming a closed loop.

[0093] Please see Figure 1 , Figure 4 and Figure 5 In one embodiment, after the infusion rate is manually set, the motor 1121 is powered on, automatically initialized, and rotates at a constant speed, driving the rotating shaft 1131 to rotate. The encoder 121 stops at the preset start / stop position, that is, the encoder 12 just detects a detection notch 1211 on the encoder 121. At this time, the middle position of the groove surface of the first cam 1132 is in contact with the pressure relief plate assembly, that is, the first pushing component 114 is in the highest lifting state relative to the pipeline 21. The middle position of the convex surface of the second cam 1134 on the other side is in contact with the second pushing component 116, and the second pushing component 116 is in the pressing state relative to the pipeline 21.

[0094] Please see Figure 1 , Figure 4 and Figure 5In one embodiment, when the cam mechanism 113 is in a balanced state with the first pushing component 114 and the second pushing component 116, and each time it starts and stops, the first pushing component 114 and the second pushing component 116 will stop in a balanced state, so that the second pushing component 116 squeezes the pipe 21 to a certain depth each time in the start and stop position, ensuring that the first pushing component 114 stops at the middle position of the first concave surface 11322 and the second pushing component 116 stops at the middle position of the second convex surface 11341, so as to ensure the infusion accuracy.

[0095] Please see Figure 1 , Figure 4 and Figure 5 In one specific embodiment, after the micro-infusion device is powered on, it first performs an initialization operation. Two detection notches 1211 of the encoder 121 are evenly distributed on the encoder 121, and the motor 1121 rotates at a preset speed throughout the infusion process. That is, the encoder 12 detects the detection notches 1211 of the encoder 121, and when a detection notch 1211 is detected, the motor 1121 stops rotating. This avoids the situation where the first pushing component 114 and the second pushing component 116 are in an unbalanced state due to an abnormal power outage, which could cause the second pushing component 116 to slip, resulting in either too much or too little infusion. After initialization, during the infusion process, for each infusion cycle, for every half-turn of the motor 1121, the encoder 121 rotates 180°. The encoder 12 detects that the encoder 121 has rotated from one detection notch 1211 to another detection notch 1211, which completes one pulse command and one infusion cycle. The first pushing component 114 is always in the middle position of the first concave surface 11322. This ensures that even if the second pushing component 116 has a tendency to rebound due to the elastic deformation of the tubing 21 and the pressure of the liquid inside the tubing 21, the reaction force on the second pushing component 116 will be canceled out by the force of the first pushing component 114 on the cam mechanism 113. At this time, the cam mechanism 113, the first pushing component 114, and the second pushing component 116 are in a balanced state.

[0096] Of course, it should be noted that each start of the motor 1121 can overcome the starting torque of this balance structure, thus enabling the motor 1121 and the infusion mechanism 20 to operate in an orderly manner.

[0097] This balanced state ensures that both the first and second pusher components 114 and 116 can accurately complete one infusion cycle during actual operation, without rotating an extra or insufficient angle, thus guaranteeing the accuracy of each infusion volume. Even if the pressure within the tubing 21 changes due to blockage or other abnormalities, it will not affect the first and second pusher components 114 and 116, thereby ensuring infusion accuracy.

[0098] Furthermore, defining the start / stop positions and equilibrium states for each operation ensures that the base pressure value detected by pressure sensor 13 in pipeline 21 remains relatively stable. Therefore, setting an alarm pressure threshold based on the base pressure value of pipeline 21 will also stabilize due to the stability of the base pressure value. This avoids fluctuations in the base pressure value that could lead to unstable pressure alarms, false alarms, missed alarms, or other abnormal alarms.

[0099] Meanwhile, the notches on the encoder 121 are evenly distributed, and the motor 1121 rotates at a constant speed in each infusion cycle, which also reduces the manufacturing complexity of the encoder 121 and the complexity of defining different speeds in software.

[0100] Please see Figure 1 , Figure 4 and Figure 5 In one embodiment, a control method for a microinfusion device according to any of the above embodiments includes the following steps:

[0101] In the startup step, when the fixed detection unit 122 senses the detection notch 1211, the drive mechanism 112 is controlled to operate.

[0102] In the stop step, the number of detected gaps 1211 is used to determine whether a preset number of infusion cycles have been run. When it is determined that a preset number of infusion cycles have been run and the fixed detection unit 122 senses the detection gaps 1211, the control drive mechanism 112 stops operating.

[0103] In this system, the encoder 12 completes one infusion cycle by sensing one detection gap 1211 each time, and the amount of liquid squeezed in each infusion cycle has been quantitatively designed by the mechanism. After the motor 1121 continuously outputs multiple pulses, the final infusion volume can be calculated by counting the number of detection gaps 1211.

[0104] In one embodiment, the control method further includes: obtaining the infusion volume after running one infusion cycle in advance; the controller, after receiving the target infusion volume, determines the number of infusion cycles to be run; the number of infusion cycles to be run constitutes the preset number of infusion cycles.

[0105] In one embodiment, the control method further includes a pressure detection step, wherein when the fixed detection part 122 is opposite to the detection notch 1211 and the cam mechanism 113 stops rotating, the pressure sensor 13 detects the basic pressure value of the pipeline 21, and a preset range is obtained based on the basic pressure value.

[0106] In one embodiment, the control method further includes an alarm step, wherein when the pressure value detected by the pressure sensor 13 exceeds a preset range, the alarm is controlled to perform an alarm action.

[0107] In one embodiment, the control method further includes: when the fixed detection unit 122 does not sense the detection gap 1211, the controller controls the drive mechanism 112 to operate until the fixed detection unit 122 senses the detection gap 1211, and then executes the start-up step. This prevents the micro-infusion device from accidentally losing power during the previous infusion process, which could affect the infusion accuracy of the current infusion process, and helps to correct the infusion volume for each infusion process.

[0108] In summary, the microinfusion device, microinfusion assembly 10, and control method of this application have at least the following advantages:

[0109] First, by fixing the start and stop positions of the first push assembly 114 and the second push assembly 116, the infusion accuracy of the micro-infusion device will be greatly improved, and it will not be affected by the pressure of the upstream section of the pipe of the second push assembly 116. This ensures stable operation of the product and guarantees accuracy in each infusion cycle.

[0110] Second, the pressure alarm has been stabilized, making the pressure detection of the micro-infusion device more accurate and reducing missed and false alarms. This safeguards the patient's safe infusion.

[0111] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0112] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0113] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0114] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0115] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

Claims

1. A microinfusion assembly, characterized in that, The microinfusion assembly includes: A peristaltic mechanism, comprising a drive mechanism, a cam mechanism, and a squeezing mechanism, wherein the drive mechanism drives the cam mechanism to rotate, and the squeezing mechanism periodically changes the cross-sectional area of ​​the pipeline as the cam mechanism rotates; The encoder includes a fixed detection unit and a code disk, the code disk rotating synchronously with the cam mechanism, the code disk having a detection notch, the fixed detection unit being used to sense the detection notch; the squeezing mechanism being used to synchronously complete the current infusion cycle when the detection notch rotates to be opposite to the fixed detection unit; The controller is electrically connected to the drive mechanism and the fixed detection unit respectively; the controller is used to send a start or stop signal to the drive mechanism when the detection notch rotates to be opposite to the fixed detection unit.

2. The microinfusion assembly according to claim 1, characterized in that, The number of detection gaps is at least two.

3. The microinfusion assembly according to claim 2, characterized in that, At least two of the detection notches are arranged at equal intervals along the circumference on the code disk.

4. The microinfusion assembly according to claim 1, characterized in that, The cam mechanism includes a rotating shaft, and a first cam, a pressing cam, and a second cam connected in sequence to the rotating shaft; the pressing mechanism includes a first pressing assembly, a pressing assembly, and a second pressing assembly; the first cam, the pressing cam, and the second cam respectively abut against the first pressing assembly, the pressing assembly, and the second pressing assembly.

5. The microinfusion assembly according to claim 4, characterized in that, The first cam has a first raised surface and a first concave surface connected to the first raised surface on its circumferential outer edge; the second cam has a second raised surface and a second concave surface connected to the second raised surface on its circumferential outer edge; the number of the first raised surface, the first concave surface, the second raised surface and the second concave surface are all equal to the number of the detection notches.

6. The microinfusion assembly according to claim 5, characterized in that, When the detection notch rotates to be opposite to the fixed detection part, the middle position of the first concave surface abuts against the first pushing component, and the middle position of the second convex surface abuts against the second pushing component.

7. The microinfusion assembly according to claim 5, characterized in that, When the detection notch rotates to be opposite to the fixed detection part, the head of the first protruding surface abuts against the first pushing component, and the tail of the second protruding surface abuts against the second pushing component.

8. The microinfusion assembly according to claim 5, characterized in that, There are at least two first protruding surfaces and at least two first concave surfaces, and the first protruding surfaces and the first concave surfaces are alternately arranged; there are at least two second protruding surfaces and at least two second concave surfaces, and the second protruding surfaces and the second concave surfaces are alternately arranged.

9. The microinfusion assembly according to claim 5, characterized in that, The projections of the first convex surface and the second convex surface onto the plane perpendicular to the rotation axis are both circular arcs or elliptical arcs; the projections of the first concave surface and the second concave surface onto the plane perpendicular to the rotation axis are both circular arcs or elliptical arcs; a chamfer is provided between the first convex surface and the first concave surface; a chamfer is provided between the second convex surface and the second concave surface; the projection of the extrusion cam onto the plane perpendicular to the rotation axis is elliptical.

10. The microinfusion assembly according to claim 9, characterized in that, The projections of the first protruding surface and the second protruding surface onto a plane perpendicular to the rotation axis have an overlapping area, and the angle corresponding to the overlapping area is 0.5°-5°.

11. The microinfusion assembly according to claim 5, characterized in that, When the extrusion cam is in the pressing state, the tail of the first protrusion surface abuts against the first pushing component.

12. The microinfusion assembly according to claim 4, characterized in that, The first pressing assembly includes a first abutting member, a second abutting member, and an elastic buffer member; the first abutting member is used to press against the pipeline, the second abutting member abuts against the cam mechanism, and the first abutting member is connected to the second abutting member through the elastic buffer member.

13. The microinfusion assembly according to any one of claims 4 to 12, characterized in that, The extrusion assembly includes an extrusion block and an elastic connector, wherein the extrusion block abuts against the cam mechanism through the elastic connector.

14. A microinfusion device, characterized in that, The microinfusion device includes the microinfusion assembly as described in any one of claims 1 to 13, and further includes an infusion mechanism, the infusion mechanism including a tubing and a support, the tubing being located on the support, and the squeezing mechanism being located on one side of the support and periodically changing the cross-sectional area of ​​the tubing.

15. A control method for the microinfusion device as described in claim 14, characterized in that, Includes the following steps: In the startup process, when the fixed detection unit senses the detection gap, the controller controls the drive mechanism to operate. The stopping step involves determining whether a preset number of infusion cycles have been run based on the number of detected gaps. When it is determined that a preset number of infusion cycles have been run and the fixed detection unit senses the detection gaps, the controller controls the drive mechanism to stop operating.

16. The control method according to claim 15, characterized in that, The control method further includes: obtaining the infusion volume after running one infusion cycle in advance; the controller, after receiving the target infusion volume, determines the number of infusion cycles to be run; the number of infusion cycles to be run constitutes the preset number of infusion cycles.

17. The control method according to claim 15, characterized in that, The control method also includes a pressure detection step. When the fixed detection part is opposite to the detection notch and the cam mechanism stops rotating, the pressure of the pipeline is detected by the pressure sensor to obtain the basic pressure value, and a preset range is obtained based on the basic pressure value.

18. The control method according to claim 17, characterized in that, The control method also includes an alarm step, which controls the alarm to activate when the pressure value detected by the pressure sensor exceeds the preset range.

19. The control method according to any one of claims 15 to 18, characterized in that, The control method further includes: when the fixed detection unit does not sense the detection gap, the controller controls the drive mechanism to move until the fixed detection unit senses the detection gap, and then executes the start-up step.

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