A method for regulating the flow rate of an injection device, the injection device itself, and a storage medium.

Abstract

This application discloses a flow rate regulation method for an injection device, the injection device itself, and a storage medium. The injection device is based on a peristaltic pump for liquid drive. The method includes: performing a pre-injection operation using a preset flow rate; determining the corresponding actual flow rate based on the pre-injection operation; determining the actual single-turn volume of the peristaltic pump based on the preset flow rate and the actual flow rate; and adjusting the rotational speed of the peristaltic pump accordingly using the actual single-turn volume during the injection operation. Through this method, this application can automatically adjust the peristaltic pump speed to maintain the stability of the injection device's flow rate.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a method for regulating the flow of an injection device, the injection device, and a storage medium. Background Technology

[0002] A peristaltic pump consists of three parts: a drive unit, a pump head, and a tubing. The working principle of a peristaltic pump is similar to squeezing a tubing filled with liquid with your fingers. As you slide your fingers forward, the fluid moves forward within the tubing. Peristaltic pumps use rollers instead of fingers in their design. Fluid is pumped by alternately squeezing and releasing the pump's elastic delivery tubing. Just like squeezing a tubing with two fingers, as the fingers move, a negative pressure is created inside the tubing, causing the liquid to flow.

[0003] A peristaltic pump uses a pump tube between two rotating rollers to form a "pillow" shape for fluid flow. The volume of the "pillow" depends on the inner diameter of the pump tube and the geometry of the rotor. The flow rate depends on the product of three parameters: the pump head rotation speed, the size of the "pillow," and the number of "pillows" produced per rotor revolution. The size of the "pillow" is generally constant.

[0004] A peristaltic pump is a precision fluid transfer instrument commonly used in the pharmaceutical industry for delivering nutrients, pH adjusters, and dispensing drugs; in the laboratory field for cell and tissue transport, specimen decolorization, perfusion, liquid chromatography analysis, and the delivery of acidic or alkaline solutions; in the food and chemical industry for dispensing fruit juices, yogurt, flavorings, syrups, and filling other food products; and in general applications for delivering fuel liquids, etching chemicals, printing inks, laundry chemicals, grinding fluids, and lubricants. Therefore, precise flow control of the peristaltic pump is essential. Summary of the Invention

[0005] The main technical problem addressed by this application is to provide a method for regulating the flow rate of an injection device, which enables the injection device to maintain the stability of its flow rate by adjusting the rotation speed of the injection device.

[0006] To address the aforementioned technical problems, this application provides a flow rate adjustment method for an injection device. This method is based on a peristaltic pump for liquid driving. The method includes: performing a pre-injection operation using a preset flow rate; determining the corresponding actual flow rate based on the pre-injection operation; determining the actual single-turn volume of the peristaltic pump based on the preset flow rate and the actual flow rate; and adjusting the rotation speed of the peristaltic pump accordingly using the actual single-turn volume during the injection operation.

[0007] Furthermore, in the step of determining the corresponding actual flow rate based on the pre-injection operation, the steps include: determining the pipe diameter parameters and preset flow rate of the injection device; determining the first volume of the pre-injected liquid based on the pipe diameter parameters; acquiring the first pressure and the second pressure collected by the differential pressure sensor; determining the second volume of the pre-injected liquid based on the first pressure and the second pressure; determining the pre-injection duration based on the first volume and the preset flow rate; and determining the actual flow rate based on the first volume, the second volume, and the pre-injection duration.

[0008] Furthermore, in determining the pre-injection duration based on the first volume and the preset flow rate, and determining the actual flow rate based on the first volume, the second volume, and the pre-injection duration, the process includes: determining a lower limit value of the preset flow rate based on the preset flow rate; determining a first duration based on the first volume and the lower limit value of the preset flow rate; determining a reserved duration; determining the pre-injection duration based on the reserved duration and the first duration; and determining the actual flow rate based on the first volume, the second volume, and the pre-injection duration.

[0009] Furthermore, the method specifically includes calculating the actual flow rate of the pre-injected liquid using the following formula:

[0010]

[0011] Where w2 is the actual flow rate, V1 is the first volume, V2 is the second volume, and T is the pre-injection time.

[0012] The process of determining the actual single-revolution of the peristaltic pump based on the preset flow rate and the actual flow rate includes: determining the preset single-revolution and preset flow rate of the peristaltic pump; determining the drive pump speed based on the preset single-revolution and preset flow rate; and determining the actual single-revolution of the peristaltic pump based on the peristaltic pump speed and the actual flow rate.

[0013] Furthermore, the method specifically includes calculating the actual single-turn volume of the peristaltic pump using the following formula:

[0014]

[0015] Where Q2 is the actual single-cycle volume, w2 is the actual flow velocity, Q1 is the preset single-cycle volume, and w1 is the preset flow velocity.

[0016] During the pre-injection operation, the peristaltic pump speed is adjusted accordingly based on the actual single-turn volume, including: reducing the peristaltic pump speed when the actual single-turn volume is less than the preset single-turn volume; and increasing the peristaltic pump speed when the actual single-turn volume is greater than the preset single-turn volume.

[0017] Furthermore, the method specifically includes calculating the adjusted peristaltic pump speed using the following formula:

[0018]

[0019] Where r is the adjusted peristaltic pump speed, w1 is the preset flow rate, Q1 is the preset single-revolution amount, and Q2 is the actual single-revolution amount.

[0020] To address the aforementioned issues, another technical solution adopted in this application is to provide an injection device, which includes a differential pressure sensing device, a processor, and a memory coupled to the processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned method.

[0021] To address the aforementioned issues, another technical solution adopted in this application is to provide a computer-readable storage medium, wherein program data is stored in the computer-readable storage medium, and the program data is used to implement the aforementioned method when executed by a processor.

[0022] The beneficial effects of this application are as follows: Unlike existing technologies, this application provides a flow rate regulation method for an injection device. The injection device is driven by a peristaltic pump. Specifically, the method includes: performing a pre-injection operation using a preset flow rate; determining the corresponding actual flow rate based on the pre-injection operation; determining the actual single-turn volume of the peristaltic pump based on the preset flow rate and the actual flow rate; and adjusting the rotational speed of the peristaltic pump accordingly during the injection operation using the actual single-turn volume. Through this method, the accuracy of the flow rate can be verified before the formal injection operation, and the flow rate of the injection device can be adjusted by regulating the rotational speed of the peristaltic pump, thus maintaining the accuracy and stability of the flow rate. Attached Figure Description

[0023] 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 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. Wherein:

[0024] Figure 1 This is a schematic flowchart of an embodiment of a flow rate adjustment method for an injection device provided in this application;

[0025] Figure 2 This is a schematic diagram of an embodiment of an injection device provided in this application;

[0026] Figure 3 This is a flowchart illustrating an embodiment of a method for determining actual flow velocity provided in this application;

[0027] Figure 4 This is a flowchart illustrating another embodiment of a method for determining actual flow rate provided in this application;

[0028] Figure 5This is a flowchart illustrating an embodiment of a method for determining the actual single-lap distance provided in this application;

[0029] Figure 6 This is a schematic flowchart of an embodiment of a method for adjusting the speed of a peristaltic pump provided in this application;

[0030] Figure 7 This is a schematic diagram of an embodiment of an injection device provided in this application;

[0031] Figure 8 This is a schematic diagram of an embodiment of the computer-readable storage medium provided in this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all methods and processes. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] Peristaltic pumps are widely used in medical, chemical, biological, and petroleum fields. In practical applications, peristaltic pumps work by using a rotating roller to compress the pump tubing, creating a pillow-shaped fluid flow. The flow rate of a peristaltic pump is closely related to the pump's rotational speed and the size of the pillow shape. Based on this principle, the pump tubing is easily damaged due to continuous compression over the years, leading to changes in the tubing's inner diameter. Changes in the gap between the rotating roller and the pump wall, as well as variations in the pump's pressure, all cause changes in the flow rate. To ensure a constant flow rate, the pump's rotational speed must be adjusted promptly to correct the flow rate.

[0036] See Figure 1 , Figure 1 This is a schematic flowchart of an embodiment of a flow rate adjustment method for an injection device provided in this application. This embodiment specifically includes steps 11 to 14:

[0037] Step 11: Perform pre-injection using a preset flow rate.

[0038] Pre-injection is the process of filling a peristaltic pump with a preset liquid and flow rate over a preset time until the pump's inner tube is full of liquid, with any excess liquid flowing into the container. The flow rate is the volume of liquid delivered per unit time.

[0039] Before using the peristaltic pump, a pre-injection operation can be performed to fill the inner tube of the peristaltic pump with a preset liquid to check whether the flow rate of the peristaltic pump is equal to the preset flow rate. If they are equal, there is no need to adjust the flow rate of the peristaltic pump. If they are not equal, the flow rate of the peristaltic pump can be corrected in time before the actual injection to avoid losses.

[0040] During the pre-injection operation, a preset flow rate and a preset liquid must be used to pre-inject the inner tube. The preset flow rate can be set based on empirical values.

[0041] Optionally, the preset liquid can be water, distilled water, physiological saline, glucose, etc.

[0042] Step 12: Determine the corresponding actual flow rate based on the pre-injection operation.

[0043] The peristaltic pump is pre-injected according to the preset flow rate. In actual operation, due to unstable pressure or certain errors in the actual flow rate, there is a certain difference between the actual flow rate and the preset flow rate. Therefore, it is necessary to calculate and determine the actual flow rate of the peristaltic pump.

[0044] Step 13: Determine the actual number of revolutions of the peristaltic pump based on the preset flow rate and the actual flow rate.

[0045] The volume delivered per revolution is the amount of liquid delivered by the peristaltic pump in one revolution.

[0046] There is a direct proportional relationship between flow rate and single-turn volume; that is, when the flow rate is higher, the corresponding single-turn volume of the peristaltic pump is also higher. Given a preset flow rate, the preset single-turn volume can be obtained. Based on this direct proportionality between flow rate and single-turn volume, the actual single-turn volume can be determined using the preset flow rate, the actual flow rate, and the preset single-turn volume.

[0047] The amount of gas per revolution of a peristaltic pump determines its flow rate.

[0048] Step 14: During the injection operation, adjust the speed of the peristaltic pump accordingly based on the actual single-turn volume.

[0049] The preset flow rate can be used to obtain the preset single-turn volume of the peristaltic pump. The error in flow rate can be determined by comparing the preset single-turn volume with the actual single-turn volume. The speed of the peristaltic pump that needs to be adjusted can be obtained by using the preset single-turn volume and the actual single-turn volume. Adjusting the speed of the peristaltic pump can thus adjust the flow rate of the peristaltic pump.

[0050] The above method involves first performing a pre-injection operation using a preset flow rate; then determining the corresponding actual flow rate based on the pre-injection operation; finally, determining the actual single-turn volume of the peristaltic pump based on the preset and actual flow rates; and then adjusting the peristaltic pump speed accordingly during the injection operation using the actual single-turn volume. Based on this method, the flow rate of the peristaltic pump can be checked before the formal injection operation, and the pump speed can be adjusted based on the actual and preset flow rates, thereby regulating the flow rate. This method effectively avoids inaccurate flow rates during peristaltic pump use.

[0051] This invention is based on an injection device that uses a peristaltic pump for liquid driving; see details below. Figure 2 , Figure 2 This is a schematic diagram of an embodiment of an injection device provided in this application.

[0052] The injection device 100 includes a peristaltic pump 10, a peristaltic pump inner tube 20, a differential pressure sensor 30, and a liquid container 40. When liquid is injected into the peristaltic pump inner tube, the peristaltic pump 10 rotates continuously, and different rotating rollers successively squeeze the peristaltic pump inner tube 20, forming pillow-shaped fluids between two rotating rollers. The liquid eventually flows into the liquid container 40. According to the principle of liquid pressure, the differential pressure sensor 30 detects different pressure values ​​at the same location as the liquid level increases, and the higher the liquid level, the greater the pressure value collected. Using the differential pressure sensor 30, the pressure values ​​at different liquid levels in the liquid container 40 can be obtained, and the volume of liquid in the liquid container 40 can be calculated based on the initial and final pressure values.

[0053] During pre-injection, a pre-injection operation is performed based on the aforementioned injection device 100. First, a preset flow rate of the preset liquid is determined, and the pre-injection duration is determined based on this preset flow rate to ensure that the liquid ultimately flows into the liquid container 40. The pre-injection operation is performed on the injection device according to the preset flow rate and preset duration, and the differential pressure sensor 30 acquires the initial pressure value and the final pressure value after pre-injection. Through this device, the total liquid volume and total injection duration during the entire pre-injection process can be determined, and the difference between the final single-turn volume of the injection device and the preset single-turn volume can be determined using the aforementioned method. The rotation speed of the peristaltic pump 10 is then adjusted based on this difference.

[0054] The actual flow rate of a peristaltic pump is related to the total volume of liquid and the total injection time during the pre-injection process. Based on the above principle, this application proposes a method for determining the actual flow rate.

[0055] See Figure 3 , Figure 3 This is a flowchart illustrating an embodiment of a method for determining actual flow velocity provided in this application. This embodiment specifically includes steps 121 to 123:

[0056] Step 121: Determine the pipe diameter parameters of the injection device, and determine the first volume of the pre-injected liquid based on the pipe diameter parameters.

[0057] Obtain the inner tube diameter parameters of the peristaltic pump. Based on the inner tube diameter parameters, the inner tube volume of the peristaltic pump can be determined. The first volume of liquid in the inner tube can then be obtained from the inner tube volume.

[0058] When the radius of the inner tube in the peristaltic pump is R and the length of the inner tube is L, the first volume can be calculated according to the following formula:

[0059] V1=πR 2 L

[0060] Step 122: Obtain the first pressure and the second pressure collected by the differential pressure sensor, and determine the second volume of the pre-injected liquid based on the first pressure and the second pressure.

[0061] The total liquid volume used during the pre-injection process comprises two parts. The first part is determined by the formula above, and the second part is the liquid volume in the container. Here, this application uses a differential pressure sensor to collect the liquid pressure before and after the pre-injection begins. Based on the difference between the two pressure values, the second volume of liquid in the container can be determined.

[0062] Assuming the initial pressure value collected by the differential pressure sensor is P0 and the final pressure value is P1, the second volume of the liquid can be calculated using the following formula:

[0063]

[0064] Where ρ is the liquid density, g is the gravitational acceleration, and H is the height difference of the liquid level before and after the pre-injection.

[0065] Assuming the liquid container in this application is a cylinder, the second volume of the liquid is then determined using the volume calculation formula:

[0066]

[0067] Where R1 is the radius of the liquid container and V2 is the second volume.

[0068] Step 123: Determine the pre-injection time based on the first volume and the preset flow rate, and determine the actual flow rate based on the first volume, the second volume, and the pre-injection time.

[0069] The first volume is the volume of liquid when the inner tube of the peristaltic pump is full of liquid. The minimum preset flow rate is determined based on the error range of the flow rate. The maximum duration of the pre-injection process of the peristaltic pump can be determined based on the minimum flow rate and the first volume to ensure that the inner tube of the peristaltic pump is full of liquid and that excess liquid can flow into the liquid container.

[0070] The total volume of liquid used in this pre-injection process can be determined based on the first volume and the second volume, and the actual flow rate of the pre-injection process can be determined based on the total volume and the maximum pre-injection duration mentioned above.

[0071] In the above method, determining the maximum duration of the pre-injection process using the minimum flow rate of the peristaltic pump ensures that the liquid fills the inner tube of the peristaltic pump during the pre-injection process and successfully flows into the liquid container, making the calculation more accurate. If the pre-injection time is too short, a situation may arise where the pre-injection process ends before the inner tube of the peristaltic pump has been filled. In this case, the total volume of liquid in the pre-injection is difficult to determine, causing difficulties for subsequent calculations.

[0072] See Figure 4 , Figure 4 This is a flowchart illustrating another embodiment of a method for determining actual flow velocity provided in this application. This embodiment specifically includes steps 1231 to 1234:

[0073] Step 1231: Determine the lower limit of the preset flow rate based on the preset flow rate.

[0074] According to regulations, the error range for flow rate is ±5%. If the preset flow rate is w1 = 2 ml / s, then the minimum preset flow rate is w1 / 2 ml / s. 1下 =1.9ml / s.

[0075] Optionally, the preset flow rate can be set to other values.

[0076] Step 1232: Determine the first duration based on the first volume and the lower limit of the preset flow rate.

[0077] The first duration is calculated using the following formula:

[0078]

[0079] Where V1 is the first volume, w 1下 The preset flow rate lower limit is T1, which is the first duration.

[0080] Using the above formula, the maximum time required for liquid to fill the inner tube of the peristaltic pump can be determined based on the preset lower limit of the flow rate.

[0081] Step 1233: Determine the reserved duration and the pre-injection duration based on the reserved duration and the first duration.

[0082] Generally, the inner tube of a peristaltic pump includes a puncture needle for fluid insertion and a Luer connector for connecting to the outer tube. When the fluid passes through the puncture needle and Luer connector, the cross-sectional area becomes smaller, which takes a longer time. Therefore, a certain amount of time needs to be reserved to ensure that the fluid flows through the puncture needle and Luer connector.

[0083] In this application, the reserved time is set to 2 seconds. Therefore, the sum of the reserved time and the first time is the pre-injection time. The formula is as follows:

[0084] T = T1 + T2

[0085] Where T2 is the reserved time and T is the pre-injection time.

[0086] Specifically, to ensure that the liquid fills the inner tube of the peristaltic pump during the pre-injection process, the pre-injection time must be long enough. If the pre-injection time is too short, the liquid will not fill the inner tube of the peristaltic pump, and the first volume of the liquid cannot be determined based on the volume of the inner tube of the peristaltic pump, which will prevent subsequent calculations from being performed.

[0087] Steps 1, 2, 3, and 4: Determine the actual flow rate based on the first volume, the second volume, and the pre-injection time.

[0088] The actual flow velocity is calculated using the following formula:

[0089]

[0090] Where w2 is the actual flow rate, V1 is the first volume, V2 is the second volume, and T is the pre-injection time.

[0091] The single-revolution quantity is frequently encountered when calculating the flow rate and velocity of a peristaltic pump, representing the volume of liquid delivered in one revolution of the pump. In this application, the actual flow rate of the peristaltic pump can be corrected by comparing the calculated actual single-revolution quantity with the preset single-revolution quantity.

[0092] See Figure 5 , Figure 5 This is a flowchart illustrating an embodiment of a method for determining the actual single-lap distance provided in this application. This embodiment specifically includes steps 131 to 133:

[0093] Step 131: Determine the preset peristaltic pump cycle count and preset flow rate.

[0094] Before pre-injection, the peristaltic pump's preset single-turn volume and preset flow rate are set based on empirical values.

[0095] Step 132: Determine the peristaltic pump speed based on the preset single-turn volume and preset flow rate.

[0096] When determining the preset single-revolution rate and preset flow rate, the preset rotational speed of the peristaltic pump can be determined according to the following formula:

[0097]

[0098] Where r1 is the preset rotational speed, w1 is the preset flow rate, and Q1 is the preset single-revolution rate. The rotational speed of the peristaltic pump during the pre-injection process can be determined using the above formula.

[0099] Step 133: Determine the actual number of revolutions of the peristaltic pump based on the peristaltic pump speed and the actual flow rate.

[0100] The preset single-revolution volume and preset flow rate are values ​​under ideal conditions during the pre-injection process. However, in actual operation, certain errors may occur due to factors such as the elasticity of the roller tube, the gap between the roller and the pump wall, and the pressure. Therefore, the actual flow rate of the peristaltic pump is determined using the method described above. The peristaltic pump rotates at a constant speed during the pre-injection process; therefore, the actual single-revolution volume of the peristaltic pump can be determined using the pump speed r1, the preset single-revolution volume, the preset flow rate, and the actual flow rate.

[0101] The actual number of revolutions per a peristaltic pump is determined using the following formula:

[0102]

[0103] Where Q2 is the actual single-turn volume of the peristaltic pump, Q1 is the preset single-turn volume of the peristaltic pump, w1 is the preset flow rate, and w2 is the actual flow rate.

[0104] Using the method described above, the actual single-revolution volume of the peristaltic pump can be determined by utilizing the constant rotation speed of the peristaltic pump during the pre-injection process. Since the actual single-revolution volume of the peristaltic pump determines its actual flow rate, the flow rate can be adjusted by regulating the single-revolution volume.

[0105] The rotational speed of a peristaltic pump determines its flow rate per revolution. Generally, a higher rotational speed means the pump rotates faster per unit time, resulting in more frequent compression of the pump's inner tube and a lower flow rate. Conversely, a lower rotational speed means the pump rotates slower per unit time, resulting in fewer compressions of the inner tube and a higher flow rate. By adjusting the pump's rotational speed, both the flow rate and the flow rate can be adjusted.

[0106] See Figure 6 , Figure 6 This is a flowchart illustrating an embodiment of a method for adjusting the speed of a peristaltic pump provided in this application. This embodiment specifically includes steps 141 to 142:

[0107] Step 141: In response to the actual single revolution being less than the preset single revolution, adjust the peristaltic pump speed to decrease.

[0108] Step 142: In response to the actual single-turn volume being greater than the preset single-turn volume, adjust the peristaltic pump speed to increase.

[0109] Compare the actual single-revolution amount with the preset single-revolution amount. If the actual single-revolution amount is less than the preset single-revolution amount, the goal is to increase the single-revolution amount of the peristaltic pump in order to increase the flow rate of the peristaltic pump. In this case, it can be understood that the speed of the peristaltic pump should be reduced to meet the above conditions.

[0110] This application proposes a scientific calculation method to determine the adjusted peristaltic pump speed using a preset flow rate, the actual single-turn volume, and the preset single-turn volume.

[0111] Refer to the following formula:

[0112]

[0113] Where r is the adjusted peristaltic pump speed, w1 is the preset flow rate, Q1 is the preset single-revolution amount, and Q2 is the actual single-revolution amount.

[0114] This application first determines the difference between twice the preset single-revolution distance and the actual single-revolution distance. When the actual single-revolution distance is equal to the preset single-revolution distance, the difference between the two is exactly equal to the preset single-revolution distance, and the calculated speed is the preset speed. When the actual single-revolution distance is less than the preset single-revolution distance, the difference between the two is greater than the preset single-revolution distance, and the calculated speed is less than the preset speed, which achieves the purpose of increasing the single-revolution distance. Similarly, when the actual single-revolution distance is greater than the preset single-revolution distance, the difference between the two is less than the preset single-revolution distance, and the calculated speed is greater than the preset speed, which achieves the purpose of decreasing the single-revolution distance.

[0115] Using the above method, this application can scientifically and reasonably calculate the peristaltic pump speed based on the preset flow rate, the actual single-turn volume, and the preset single-turn volume. When the actual single-turn volume is exactly equal to the preset single-turn volume, the peristaltic pump speed remains unchanged; when the actual single-turn volume is too large, the peristaltic pump speed is increased; when the actual single-turn volume is too small, the peristaltic pump speed is decreased.

[0116] This application also proposes an injection device, specifically, please refer to [link to relevant documentation]. Figure 7 , Figure 7 This is a schematic diagram of an embodiment of an injection device provided in this application.

[0117] The injection device 200 includes a differential pressure sensor 210, a processor 220, and a memory 230. The differential pressure sensor 210 detects the liquid level differential pressure, and the processor 220 and memory 230 are coupled. The memory 230 stores a computer program used to execute the flow regulation method of the injection device described above.

[0118] Optionally, in one embodiment, the processor 220 is used to execute program data to implement the following method: performing a pre-injection operation using a preset flow rate; determining the corresponding actual flow rate based on the pre-injection operation; determining the actual single-turn volume of the peristaltic pump based on the preset flow rate and the actual flow rate; and adjusting the rotation speed of the peristaltic pump accordingly using the actual single-turn volume during the injection operation.

[0119] The processor 220 can also be referred to as the C memory 230PU (Central Processing Unit). The processor 220 may be an electronic chip with signal processing capabilities. The processor 220 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor can be a microprocessor or any conventional processor.

[0120] The memory 230 can be a memory module, TF card, etc., and can store all the information in the injection device 200, including the input raw data, computer program, intermediate running results, and final running results. It stores and retrieves information according to the location specified by the processor 220. With the memory 230, the injection device 200 has a memory function and can ensure normal operation. The memory 230 of the injection device 200 can be classified according to its purpose as main memory (RAM) and auxiliary memory (external memory), or it can be classified as external memory and internal memory. External memory is usually magnetic media or optical discs, which can store information for a long time. RAM refers to the storage components on the motherboard, used to store currently executing data and programs, but it is only used for temporary storage of programs and data; the data will be lost when the power is turned off.

[0121] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the embodiments of the injection device 200 described above are merely illustrative, and in actual implementation, there may be other divisions.

[0122] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0123] See Figure 8 , Figure 8This is a schematic diagram of an embodiment of a computer-readable storage medium provided in this application. The computer-readable storage medium 300 stores program instructions 310 capable of implementing all the above methods.

[0124] If the integrated units of the various functional units in the various embodiments of this application are implemented as software functional units and sold or used as independent products, they can be stored in the computer-readable storage medium 300. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer-readable storage medium 300 includes a number of instructions in a program instruction 310 to cause a computer device (which may be a personal computer, system server, or network device, etc.), an electronic device (e.g., MP3, MP4, etc., or a mobile terminal such as a mobile phone, tablet computer, or wearable device, or a desktop computer, etc.) or a processor to execute all or part of the steps of the methods of the various embodiments of this application.

[0125] Optionally, in one embodiment, when the program instruction 310 is executed by the processor, it is used to implement the following method: performing a pre-injection operation using a preset flow rate; determining the corresponding actual flow rate based on the pre-injection operation; determining the actual single-turn volume of the peristaltic pump based on the preset flow rate and the actual flow rate; and adjusting the rotation speed of the peristaltic pump accordingly using the actual single-turn volume during the injection operation.

[0126] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media 300 (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0127] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by a computer-readable storage medium 300. These computer-readable storage media 300 can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that program instructions 310, executable by the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart. Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0128] These computer-readable storage media 300 may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that program instructions 310 stored in the computer-readable storage media 300 produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0129] These computer-readable storage media 300 can also be loaded onto a computer or other programmable data processing apparatus, causing a series of operational steps to be executed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing program instructions 310 that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0130] In one embodiment, these programmable data processing devices include a processor and memory. The processor may also be referred to as a CPU (Central Processing Unit). The processor may be an electronic chip with signal processing capabilities. The processor may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor may be a microprocessor or any conventional processor.

[0131] Memory can be a RAM module, a TF card, etc., and it stores and retrieves information according to the location specified by the processor. Memory can be classified according to its purpose into main memory (RAM) and auxiliary memory (external storage), or it can be classified into external memory and internal memory. External storage is usually magnetic media or optical discs, which can store information permanently. RAM refers to the storage components on the motherboard, used to store currently executing data and programs, but it is only used for temporary storage of programs and data; the data will be lost when the power is turned off.

[0132] Unlike existing technologies, this application proposes a flow rate regulation method for an injection device based on a peristaltic pump for liquid drive. The method includes: performing a pre-injection operation using a preset flow rate; determining the corresponding actual flow rate based on the pre-injection operation; determining the actual single-turn volume of the peristaltic pump based on the preset flow rate and the actual flow rate; and adjusting the peristaltic pump speed accordingly using the actual single-turn volume during the injection operation. Using this method, this application can detect the actual single-turn volume of the peristaltic pump during the pre-injection operation, determine the peristaltic pump speed based on the actual single-turn volume and the preset single-turn volume, and adjust the peristaltic pump flow rate by adjusting the peristaltic pump speed. Simultaneously, the pre-injection operation in this application is based on a sufficiently long pre-injection duration to ensure that the liquid fills the inner tube of the peristaltic pump during the pre-injection process, facilitating subsequent determination of the actual single-turn volume. In summary, this application has the advantages of automatically adjusting the peristaltic pump speed and maintaining a stable peristaltic pump flow rate.

[0133] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method of flow regulation of an injection device, characterized in that, The injection device includes a liquid container, a peristaltic pump, a peristaltic pump inner tube, and a differential pressure sensor. The liquid container and the peristaltic pump are independent of each other and are connected through the peristaltic pump inner tube. The differential pressure sensor is located inside the liquid container and is used to detect the liquid level differential caused by changes in liquid level within the liquid container to determine the volume of liquid flowing into the liquid container. The injection device is driven by the peristaltic pump. The peristaltic pump includes multiple rotating rollers. When the peristaltic pump rotates, different rollers successively squeeze the peristaltic pump inner tube to form a pillow-shaped fluid between two rollers. The peristaltic pump inner tube includes a puncture needle for liquid insertion and a Luer connector connecting to an outer tube. The cross-sectional area of ​​the puncture needle and the Luer connector is smaller than the cross-sectional area of ​​the outer tube. The method includes: A pre-injection operation is performed using a preset flow rate; the pre-injection operation is used to fill the inner tube of the peristaltic pump with liquid and allow excess liquid to flow into the liquid container. Determine the pipe diameter parameters and preset flow rate of the injection device, and determine the first volume of the pre-injected liquid based on the pipe diameter parameters; The first pressure and the second pressure collected by the differential pressure sensing device when the liquid in the liquid container is at different liquid levels are obtained, and the second volume of the pre-injected liquid is determined based on the first pressure and the second pressure. The lower limit value of the preset flow rate is determined based on the preset flow rate; The first duration is determined based on the first volume and the lower limit of the preset flow rate; Determine the allowance for compensating for the time required for fluid to flow through the puncture needle and the Luer connector, and determine the pre-injection duration based on the allowance and the first duration; The actual flow rate is determined based on the first volume, the second volume, and the pre-injection duration; The actual number of revolutions of the peristaltic pump is determined based on the preset flow rate and the actual flow rate. During the injection operation, the rotation speed of the peristaltic pump is adjusted accordingly based on the actual single-turn volume.

2. The method according to claim 1, characterized in that, The method specifically includes: The actual flow rate of the pre-injected liquid is calculated using the following formula: wherein, is the actual flow rate, is the first volume, is the second volume, is the pre-injection time length.

3. The method according to claim 1, characterized in that, Determining the actual single-cycle volume of the peristaltic pump based on the preset flow rate and the actual flow rate includes: Determine the preset single-revolution quantity and preset flow rate of the peristaltic pump; The peristaltic pump speed is determined based on the preset single revolution amount and preset flow rate; The actual number of revolutions of the peristaltic pump is determined based on the peristaltic pump speed and the actual flow rate.

4. The method according to claim 3, characterized in that, The method specifically includes: The actual single-revolution distance of the peristaltic pump is calculated using the following formula: in, This refers to the actual single-lap distance. The actual flow rate, For the preset single lap distance, The preset flow rate.

5. The method according to claim 3 or 4, characterized in that, The method of adjusting the peristaltic pump speed accordingly using the actual single-turn volume during injection includes: In response to the actual single revolution being less than the preset single revolution, the peristaltic pump speed is adjusted to decrease. In response to the actual single-turn amount being greater than the preset single-turn amount, the peristaltic pump speed is adjusted to increase.

6. The method according to claim 5, characterized in that, The method specifically includes: The adjusted peristaltic pump speed is calculated using the following formula: in, The adjusted peristaltic pump speed. For the preset flow rate, For the preset single lap distance, This refers to the actual single-lap distance.

7. An injection device, characterized in that, The injection device includes a differential pressure sensor, a processor, and a memory coupled to the processor. The differential pressure sensor is used to detect liquid level differential pressure. The memory stores a computer program, and the processor is used to execute the computer program to implement the method as described in any one of claims 1-6.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores program data, which, when executed by a processor, is used to implement the method as described in any one of claims 1-6.

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