Intelligent infusion metering control device

Abstract

The application discloses an intelligent infusion metering control device, comprising: a processing unit; a flow rate control module comprising a non-contact capacitive flowmeter and a flow rate regulator, the non-contact capacitive flowmeter being used for detecting the flow rate of the liquid medicine in an infusion tube in real time and sending a flow rate detection signal to the processing unit, and the flow rate regulator being used for adjusting the flow cross section of the infusion tube according to the flow rate instruction of the processing unit to control the flow rate of the liquid medicine; a temperature control module comprising a temperature sensor and a heating unit, the temperature sensor being used for detecting the temperature of the liquid medicine in the infusion tube in real time and sending a temperature detection signal to the processing unit, and the heating unit being used for heating the outer wall of the infusion tube according to the temperature instruction of the processing unit to control the temperature of the liquid medicine. The intelligent infusion metering control device in the application simultaneously realizes accurate control of the flow rate and the temperature.

Description

Technical Field

[0001] This invention relates to the field of medical equipment technology, and in particular to an intelligent infusion metering and control device. Background Technology

[0002] In clinical practice, traditional intravenous infusion methods rely primarily on medical staff or caregivers to visually assess the infusion status by observing the remaining fluid level in the IV bottle or the drip rate in the IV tubing. This method is not only labor-intensive but also prone to causing venous backflow after the infusion ends due to delayed observation, leading to patient discomfort. Especially in winter, the direct infusion of cold medications may cause vascular irritation or worsen the patient's condition. Furthermore, repeatedly manually adjusting the roller switch on the IV tubing to control the flow rate is cumbersome and lacks precision.

[0003] To address these issues, some electronic infusion monitoring devices have emerged on the market, but they still have many shortcomings. For example, they typically only allow for single-function control of flow rate or temperature. Furthermore, flow rate monitoring usually employs photoelectric detection devices, which are susceptible to interference from ambient light and are unsuitable for light-sensitive medications.

[0004] In summary, existing infusion monitoring devices cannot simultaneously achieve precise control of both flow rate and temperature. Summary of the Invention

[0005] This invention provides an intelligent infusion metering and control device to solve the problem that existing infusion monitoring devices cannot simultaneously achieve precise control of flow rate and temperature.

[0006] This invention provides an intelligent infusion metering and control device, comprising: Processing unit; The flow rate control module includes a non-contact capacitive flow meter and a flow rate regulator. The non-contact capacitive flow meter is used to detect the flow rate of the medicine in the infusion tube in real time and send the flow rate detection signal to the processing unit. The flow rate regulator is used to adjust the flow cross section of the infusion tube according to the flow rate command of the processing unit to control the flow rate of the medicine. The temperature control module includes a temperature sensor and a heating unit. The temperature sensor is used to detect the temperature of the medicine in the infusion tube in real time and send the temperature detection signal to the processing unit. The heating unit heats the outer wall of the infusion tube according to the temperature command of the processing unit to control the temperature of the medicine. The processing unit is configured to: perform closed-loop control on the flow rate regulator based on the flow rate detection signal and a preset target flow rate to generate the flow rate command; and perform closed-loop control on the heating unit based on the temperature detection signal and a preset target temperature to generate the temperature command.

[0007] In some embodiments, the non-contact capacitive flow meter includes two capacitor plates respectively disposed on both sides of the infusion tube, and the capacitance between the two capacitor plates constitutes the flow rate detection signal. The processing unit is also configured to determine the flow rate of the liquid medicine based on the capacitance.

[0008] In some embodiments, the flow rate regulator is an electronically switched pump, which includes a screw driven by a motor and a pressure plate cooperating with the screw; The motor is controlled by the flow rate command to drive the screw to move the pressure plate, which is used to squeeze the infusion tube to adjust the flow cross-section of the infusion tube.

[0009] In some embodiments, the temperature sensor is an NTC temperature sensor disposed close to the outer wall of the infusion tube, and the heating unit includes a heating plate disposed close to the outer wall of the infusion tube.

[0010] In some embodiments, the processing unit employs a PID control algorithm to perform closed-loop control on the flow rate regulator and the heating unit, respectively.

[0011] In some embodiments, the processing unit is further configured to execute infusion end safety protection logic: when the remaining infusion time is less than a preset threshold, control the flow rate regulator to gradually compress the flow cross-section of the infusion tube to gradually reduce the drug flow rate.

[0012] In some embodiments, a QR code scanner is also included; The QR code scanner is used to input infusion parameters and send them to the processing unit. The infusion parameters include the target flow rate and the target temperature.

[0013] In some embodiments, a wireless communication module and / or a display are also included; The processing unit is further configured to: determine the liquid flow rate and liquid temperature based on the flow rate detection signal and the temperature detection signal, respectively, and send the liquid flow rate and liquid temperature to an external device via the wireless communication module and / or display the liquid flow rate and liquid temperature via the display.

[0014] In some embodiments, the wireless communication module includes a WIFI module and / or a Bluetooth module.

[0015] In some embodiments, an emergency button connected to the processing unit is also included; The processing unit is also configured to send an alarm signal to the external device via the wireless communication module when the emergency button is detected to be triggered.

[0016] This invention provides an intelligent infusion metering and control device that achieves high-precision and high-stability regulation of the infusion flow rate by employing a non-contact capacitive flowmeter for real-time monitoring and combining it with a flow rate regulator driven by a closed-loop control algorithm for closed-loop feedback control. This avoids errors and fluctuations caused by manual adjustment, ensuring the accuracy of medication and improving the safety and effectiveness of treatment. Furthermore, the non-contact capacitive flowmeter, based on capacitance changes, is unaffected by ambient light compared to traditional photoelectric methods and is applicable to various special medications, offering a wider range of applications and higher reliability. Simultaneously, the integrated temperature control module enables real-time heating and constant temperature control of the medication, warming the cold solution to a suitable temperature for the human body, significantly alleviating discomfort and stinging sensations during infusion, especially suitable for frail, pediatric, and elderly patients, thus improving the infusion experience. Therefore, the intelligent infusion metering and control device of this invention simultaneously achieves precise control of both flow rate and temperature. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is an architectural diagram of the intelligent infusion metering control device in some embodiments of the present invention; Figure 2 This is an architectural diagram of the flow rate control module and the temperature control module in some embodiments of the present invention; Figure 3 This is a schematic diagram of the self-test function of the intelligent infusion metering control device in some embodiments of the present invention; Figure 4 This is an architectural diagram of an intelligent infusion metering control device in a specific embodiment of the present invention; Figure 5 This is a hardware structure diagram of an intelligent infusion metering control device in a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the full-function process of the intelligent infusion metering control device in a specific embodiment of the present invention; Figure 7 This is a schematic diagram of the cloud archiving function of the intelligent infusion metering control device in a specific embodiment of the present invention. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0020] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] This application achieves precise closed-loop control of both infusion flow rate and drug temperature through integrated design, significantly improving the quality, safety, and efficiency of infusion therapy.

[0023] In one specific embodiment, the intelligent infusion metering and control device includes: a processing unit, a flow rate control module, and a temperature control module.

[0024] The flow rate control module includes a non-contact capacitive flow meter and a flow rate regulator. The non-contact capacitive flow meter is used to detect the flow rate of the drug solution in the infusion tube in real time and send the flow rate detection signal to the processing unit. The flow rate regulator is used to adjust the flow cross section of the infusion tube according to the flow rate command of the processing unit to control the flow rate of the drug solution.

[0025] The temperature control module includes a temperature sensor and a heating unit. The temperature sensor is used to detect the temperature of the medicine in the infusion tube in real time and send the temperature detection signal to the processing unit. The heating unit heats the outer wall of the infusion tube according to the temperature command of the processing unit to control the temperature of the medicine.

[0026] The processing unit is configured to: perform closed-loop control of the flow rate regulator based on the flow rate detection signal and the preset target flow rate to generate a flow rate command; and perform closed-loop control of the heating unit based on the temperature detection signal and the preset target temperature to generate a temperature command.

[0027] Reference Figure 1Specifically, the intelligent infusion metering and control device includes a processing unit 10, a flow rate control module, and a temperature control module. The processing unit 10, as the control core of the device, is responsible for overall coordination and control. The flow rate control module is used to sense and regulate the flow rate of the medication within the infusion tube 2; it includes a non-contact capacitive flow meter 21 and a flow rate regulator 22. The temperature control module is used to sense and regulate the temperature of the medication; it includes a temperature sensor 31 and a heating unit 32. This modular design lays the foundation for achieving precise control.

[0028] During operation, the non-contact capacitive flow meter 21 is configured to detect the flow rate of the medicine in the infusion tube 2 in real time and send the flow rate detection signal containing the flow rate information to the processing unit 10. This step is the data basis for realizing closed-loop control. The photoelectric detection method in the prior art is easily affected by ambient light, while this solution uses non-contact capacitive measurement, which avoids the influence of light and has better universality.

[0029] Simultaneously, the flow rate regulator 22 is connected to the processing unit 10 to receive flow rate commands from the processing unit 10. These flow rate commands are control decisions derived by the processing unit 10 after calculation. Based on these commands, the flow rate regulator 22 physically adjusts the flow cross-section of the infusion tube 2, thereby directly controlling the actual flow rate of the medication. In this way, the output of the control algorithm is transformed into actual intervention on the flow rate, forming the execution end of the control loop.

[0030] Similarly, in terms of temperature control, temperature sensor 31 is configured to detect the temperature of the medication solution in the infusion tube 2 in real time and send a temperature detection signal containing temperature information to processing unit 10. This solves the problem of the lack of effective monitoring of medication solution temperature in the prior art, especially for infusions in winter or for weak patients, where excessively low medication solution temperature can cause discomfort. The temperature detection in this solution provides a prerequisite for this.

[0031] The heating unit 32 is also connected to the processing unit 10 and is used to receive temperature commands from the processing unit 10. According to the command, the heating unit 32 heats the outer wall of the infusion tube 2, thereby increasing the temperature of the medication inside the tube. This external heating method avoids direct contact with the medication, ensuring the sterility and safety of the medication.

[0032] The core of this technical solution lies in the dual closed-loop control logic executed by the processing unit 10. Specifically, the processing unit 10 is configured to perform closed-loop control on the flow rate regulator 22 based on the received flow rate detection signal and the preset target flow rate to generate a flow rate command. This means that the processing unit 10 continuously compares the actual liquid flow rate with the target flow rate and dynamically adjusts the action of the flow rate regulator 22 according to the deviation between the two until the actual flow rate stabilizes at the target value. Through this closed-loop feedback mechanism, the technical problems of inaccurate and easily fluctuating traditional manual flow rate adjustment are solved, achieving precise and constant flow rate control.

[0033] Simultaneously, the processing unit 10 is also configured to perform closed-loop control of the heating unit 32 based on the received temperature detection signal and the preset target temperature to generate a temperature command. Similar to flow rate control, the processing unit 10 continuously compares the actual drug solution temperature with the target temperature (e.g., 32°C) and dynamically adjusts the heating power of the heating unit 32 to keep the drug solution temperature constant within a suitable range. This closed-loop control overcomes the shortcomings of prior art technologies that only monitor temperature but cannot effectively control it, significantly improving patient infusion comfort.

[0034] In summary, the intelligent infusion metering and control device of this invention achieves high-precision and high-stability regulation of the infusion flow rate by employing a non-contact capacitive flow meter for real-time monitoring and combining it with a flow rate regulator driven by a closed-loop control algorithm for closed-loop feedback control. This avoids errors and fluctuations caused by manual adjustment, ensuring the accuracy of medication and improving the safety and effectiveness of treatment. Moreover, the non-contact capacitive flow meter, whose measurement principle is based on capacitance changes, is unaffected by ambient light compared to traditional photoelectric methods and is applicable to a variety of special medications, offering a wider range of applications and higher reliability. Simultaneously, the integrated temperature control module enables real-time heating and constant temperature control of the medication, warming the cold medication to a suitable temperature for the human body, significantly alleviating discomfort and stinging sensations during infusion, especially suitable for frail, pediatric, and elderly patients, thus improving the infusion experience. Therefore, the intelligent infusion metering and control device of this invention simultaneously achieves precise control of both flow rate and temperature.

[0035] In some embodiments, the flow rate regulator is an electronically switched pump, which includes a screw driven by a motor and a pressure plate cooperating with the screw; the motor is controlled by a flow rate command to drive the screw to move the pressure plate, and the pressure plate is used to squeeze the infusion tubing to adjust the flow cross-section of the infusion tubing.

[0036] Reference Figure 2Specifically, the non-contact capacitive flow meter 21 includes two capacitive plates 21a and 21b respectively disposed on both sides of the infusion tube 2. The capacitance value formed between these two capacitive plates 21a and 21b constitutes the flow rate detection signal. The processing unit 10 is further configured to determine the drug flow rate based on this capacitance value. The principle is that when there is no liquid in the infusion tube 2, the medium between the plates is mainly air and the tube wall material, and the capacitance value is a reference value; when the drug flows through, because the dielectric constant of the drug is much greater than that of air, the equivalent dielectric constant between the plates changes, resulting in a change in the capacitance value. The change in flow rate causes a small dynamic change in the liquid filling state in the tube, which is reflected in the change in capacitance value. Through this structure, flow rate can be sensed in a simple, reliable, and non-invasive manner. Compared with complex optical or ultrasonic solutions, this solution is lower in cost, simpler in structure, and less affected by the color and transparency of the drug, and has stronger universality.

[0037] In some embodiments, the flow rate regulator is an electronically switched pump, which includes a screw driven by a motor and a pressure plate cooperating with the screw; the motor is controlled by a flow rate command to drive the screw to move the pressure plate, and the pressure plate is used to squeeze the infusion tubing to adjust the flow cross-section of the infusion tubing.

[0038] Reference Figure 2 Specifically, the flow rate regulator 22 can be implemented as an electronic switching pump. This electronic switching pump includes a screw 22b driven by a motor 22c, and a pressure plate 22a threadedly engaged with the screw 22b. The motor 22c (e.g., a stepper motor or servo motor) is controlled by flow rate commands issued by the processing unit 10. Its precise rotation drives the screw 22b to rotate, thereby causing a minute linear displacement of the pressure plate 22a. The pressure plate 22a acts directly on the infusion tube 2, precisely adjusting its flow cross-section by squeezing the infusion tube 2 to varying degrees. This mechanical structure converts electrical signals into precise physical displacement, significantly improving adjustment accuracy and repeatability compared to traditional manual roller adjustment. This solution solves the problems of poor accuracy and easy slippage associated with manual adjustment, achieving micron-level precise control of the flow rate.

[0039] In some embodiments, the temperature sensor is an NTC temperature sensor disposed close to the outer wall of the infusion tube, and the heating unit includes a heating plate disposed close to the outer wall of the infusion tube.

[0040] Reference Figure 2Specifically, the temperature sensor can be an NTC temperature sensor 31a (negative temperature coefficient thermistor) positioned close to the outer wall of the infusion tube 2. NTC temperature sensors offer advantages such as high sensitivity, fast response, and low cost, making them ideal for real-time, accurate measurement of tube wall temperature, thereby indirectly reflecting the drug solution temperature. The heating unit 32 can specifically include a heating plate 32a, such as a flexible polyimide (PI) heating film, positioned close to the outer wall of the infusion tube 2. This heating plate can effectively cover the surface of the infusion tube 2, providing a large contact area, uniform heating, and high thermal efficiency. By combining the highly sensitive NTC temperature sensor 31a with the efficient heating plate 32a, a reliable hardware foundation is provided for achieving precise and rapid closed-loop temperature control.

[0041] In some embodiments, the processing unit uses a PID control algorithm to perform closed-loop control on the flow rate regulator and the heating unit respectively.

[0042] Specifically, the PID control algorithm is a mature and efficient control strategy that comprehensively considers the current error (proportional P), historical error accumulation (integral I), and future error trend (derivative D) to generate a control output. The processing unit uses the PID control algorithm to perform closed-loop control on the flow rate regulator and the heating unit respectively. For example, in flow rate control, the processing unit uses (target flow rate - actual flow rate) as the error input to the PID controller and outputs a control quantity to drive the flow rate regulator. Compared to simple on / off control or proportional control, the PID algorithm enables the actual flow rate to reach the target value faster and more smoothly, and effectively suppresses overshoot and oscillation. Similarly, applying the PID algorithm in temperature control can accurately stabilize the liquid temperature near the target value. By introducing the PID algorithm, the technical problems of unstable control and low accuracy are solved at the software level, which is key to achieving the high-performance indicators of this invention.

[0043] In some embodiments, the processing unit is further configured to execute end-of-infusion safety protection logic: when the remaining infusion time is less than a preset threshold, control the flow rate regulator to gradually compress the flow cross-section of the infusion tube to gradually reduce the drug flow rate.

[0044] Specifically, at the start of the infusion, the processing unit learns the total medication volume and calculates the remaining infusion volume and time in real time. When the processing unit determines that the remaining infusion time is less than a preset time threshold (e.g., 2 minutes), it actively controls the flow rate regulator to gradually compress the flow cross-section of the infusion tubing, thereby gradually reducing the medication flow rate. This "soft landing" termination method allows the final medication to be infused at an extremely slow rate until it completely stops as the infusion is about to end. The beneficial effect of this approach is that it effectively prevents common problems such as air being aspirated into the blood vessels (air embolism) or blood flowing back into the infusion tubing (venous return) caused by medication depletion and pressure imbalance. Through this intelligent prediction and intervention, the end-of-infusion safety is greatly improved, solving common safety hazards in the background technology.

[0045] In some embodiments, the intelligent infusion metering control device further includes a QR code scanner; the QR code scanner is used to input infusion parameters and send them to the processing unit, the infusion parameters including target flow rate and target temperature.

[0046] Specifically, to further enhance the device's intelligence and ease of use, it also includes a QR code scanner. This scanner scans the QR code affixed to the infusion bag or medicine bottle, automatically inputting preset infusion parameters and sending these parameters to the processing unit. Infusion parameters may include target flow rate, target temperature, and total infusion volume. By replacing manual input with QR code scanning, the operation for medical staff is greatly simplified, avoiding medical risks caused by human error (such as incorrect flow rate or total volume), and improving work efficiency and accuracy.

[0047] The QR code scanner can be integrated into the top or side of the device housing, with its scanning window facing outwards for easy user operation. This QR code scanner is electrically connected to the processing unit via an internal serial interface (such as a UART interface) or a USB interface. When the user triggers a scanning operation (e.g., via a button or software command), the QR code scanner is activated. Its built-in image sensor captures the QR code image, which is then decoded by a decoding chip. The decoded data (e.g., a string containing infusion parameters) is sent to the processing unit via the interface for further analysis and application. This integrated design makes parameter entry more convenient and accurate, and reduces the complexity of external wiring.

[0048] Reference Figure 1In some embodiments, the intelligent infusion metering control device further includes a wireless communication module 40 and / or a display 50; the processing unit 10 is also configured to: determine the drug flow rate and drug temperature according to the flow rate detection signal and the temperature detection signal respectively, and send the drug flow rate and drug temperature to an external device (such as a central monitoring computer at the nurse station or a mobile APP for medical staff) through the wireless communication module 40 and / or display the drug flow rate and drug temperature through the display 50.

[0049] Specifically, this design transforms the infusion process from an isolated event requiring manual supervision into a digital workflow that can be remotely and centrally monitored. Healthcare staff can monitor the infusion progress of all patients in real time from a central workstation without frequent ward rounds, significantly reducing the burden on caregivers. Meanwhile, the onboard monitor also facilitates on-site viewing.

[0050] The wireless communication module includes a Wi-Fi module and / or a Bluetooth module. The Wi-Fi module allows the device to directly connect to the hospital's local area network for stable, long-distance data communication with the central server. The Bluetooth module facilitates short-range pairing and data interaction between the device and mobile devices such as smartphones, for example, for initial parameter settings or use in environments without Wi-Fi. Providing two communication methods enhances the device's network adaptability and application flexibility.

[0051] Reference Figure 1 To improve the reliability of the intelligent infusion metering control device, in a preferred embodiment, the intelligent infusion metering control device further includes a battery and an intelligent power management module 60. The processing unit 10 is further configured to execute a battery life warning logic. Specifically, after receiving the set total medication volume, the processing unit 10 calculates the estimated total infusion time based on the target flow rate. Simultaneously, the intelligent power management module 60 monitors the battery level in real time and estimates the remaining battery life. When the processing unit 10 determines that the estimated battery life is less than the estimated total infusion time (or less than an infusion time with a safety margin, such as 1.5 times), it will issue an alarm signal in advance, indicating insufficient battery power. This function solves the problem of traditional electronic devices suddenly shutting down due to battery depletion during infusion. Through proactive prediction, it ensures the continuity and integrity of the infusion process, improving the reliability of the device.

[0052] To further ensure the safe operation of the equipment, in a preferred embodiment, the intelligent infusion metering control device also has a self-test function upon startup. Please refer to [link / reference]. Figure 3Upon power-on, the processing unit is first configured to execute a power-on self-test (POST) procedure. This self-test includes, but is not limited to, checking the connection and operational status of key components such as the flow control module (non-contact capacitive flow meter and flow regulator) and the temperature control module (temperature sensor and heating unit). If the self-test fails, the system will immediately alarm and terminate subsequent operations to prevent operation while malfunctioning. Only after the self-test passes is the normal procedure of acquiring infusion parameters and initiating infusion permitted. This power-on self-test mechanism effectively prevents medical accidents caused by hardware failures at the source and is a crucial step in ensuring the integrity and safety of the equipment.

[0053] Furthermore, to address unforeseen circumstances during infusion, the intelligent infusion metering control device can also include an emergency button connected to the processing unit. The processing unit is also configured to immediately send a high-priority alarm signal to an external device (such as a nurse station system) via a wireless communication module when the emergency button is triggered by a patient or healthcare worker. This function provides patients with a proactive channel for seeking help, enabling them to notify healthcare workers immediately when they feel unwell or experience an emergency, thus providing dual protection for patient safety.

[0054] The intelligent infusion metering control device of the present invention will be described in detail below through a specific embodiment.

[0055] Reference Figure 4 and Figure 5 In one specific embodiment, the intelligent infusion metering control device includes a microcontroller (microcontroller system circuit) as a control unit, an LED display, physical buttons, a flow meter, a charging and battery life detection module, a heater, a barcode sensor, an emergency button, a WIFI Bluetooth module, and a switch pump.

[0056] Reference Figure 6 This intelligent infusion metering and control device can achieve the following functions: Peripheral device reading / setting: All functions can be set via LED display and physical buttons, or by scanning a code to enter medication information, which will then be sent to mobile terminals such as medical staff's and patients' phones via WIFI and Bluetooth modules.

[0057] Collect flow rate information: The flow rate information is provided by the capacitive flow meter. The infusion start time, estimated total infusion time and infusion stop time are displayed on the LED screen and sent to the mobile phones of medical staff and patients via WIFI and Bluetooth. Alarms and patient numbers can also be set.

[0058] Specifically, the capacitive flow meter includes a capacitance detection circuit and two capacitor plates. The two capacitor plates clamp the infusion tube by springs and latches. The capacitance detection circuit is used to detect the capacitance between the two capacitor plates and provide it to the microcontroller system circuit.

[0059] The design principle of a capacitive flow meter is as follows: (1) When the capacitive flow meter is installed on the infusion tube, the spring and the latch slightly jam the outer wall of the infusion tube. The electronic sliding scale measures the voltage signal, which is sent to the microcontroller system circuit through the operational amplifier circuit. The outer diameter d of the infusion tube is obtained by looking up the table.

[0060] (2) When the fluid flows between the two capacitor plates, the dielectric constant ε of the fluid replaces the air or other medium, resulting in a change in the capacitance value.

[0061] Capacitance formula: C = ε.A / d; Where C is the capacitance, ε is the dielectric constant, A is the effective area of ​​the plates, and d is the distance between the plates.

[0062] (3) The two capacitor electrodes slightly clamp the infusion tube from the outside, and send the electrode signal u to the microcontroller through the capacitance detection circuit to obtain the capacitance C2 between the electrodes in the empty tube state and the capacitance C1 in the infusion state. (4) The microcontroller calculates the infusion flow rate Q. The flow rate calculation formula is: Q = k × (C1 - C2) + b; Where k and b are correction coefficients, which are obtained by the infusion device through multiple pre-calibrations. Flow correlation: Changes in fluid flow rate will alter the distribution of dielectric material between the plates (such as changes in liquid level and concentration), thereby affecting ε. The flow rate can be calculated by measuring C.

[0063] Flow rate control: The flow rate is controlled by an electronic switch pump. The volume of the drug solution is input from an external device, and the infusion time is set. Under the electronic control device, the switch pump controls the flow rate by squeezing the infusion tube without contacting the drug solution, thereby controlling the infusion time.

[0064] Specifically, the electronic switching pump includes a motor-driven screw and a pressure plate that cooperates with the screw. A fixed frame can be used to mount the electronic switching pump, with both the screw and pressure plate installed within the frame. The infusion tubing passes through the frame, and when the screw rotates within the frame, it drives the pressure plate to move within the frame, thereby squeezing the infusion tubing. Furthermore, charging and battery life detection functions can be implemented through a battery and voltage detection circuit.

[0065] The flow rate is controlled by switching the pump. The volume of the drug solution V is input from the external device, the infusion time is set, and the pump controls the flow rate Q under the electronic control device, thereby controlling the infusion time t. t = V / Q.

[0066] To precisely control the flow rate Q, a PID algorithm is used, as follows: Qn= Kp*(Qn - Qn-1)+Ki*Qn+Kd(Qn-2*Qn-1+Qn-2); Kp, Ki, and Kd are the optimal variables obtained from testing during the design phase and written into the microcontroller software code. Qn, Qn-1, and Qn-2 are the flow rates Q at the current time n, the previous time n-1, and the time before that n-1, respectively.

[0067] The methods for controlling the infusion time are as follows: The infusion volume V and infusion start time t1 are input via keypad or barcode scanning, and the infusion completion time t2 is obtained from the flow rate Q. t2 = V / Q - t1.

[0068] Temperature control: For situations where the medication is cold or the patient is weak, this intelligent infusion metering control device can use a heater to gently heat the infusion tubing, relieving the cold and stinging sensation of the medication without affecting its efficacy and improving the patient experience.

[0069] The heater includes a heating plate, an NTC (temperature sensor), and a heating detection circuit. The microcontroller acquires the temperature signal T1 from the NTC, and then calculates the actual temperature of the medication solution T = T1 + T2 based on the temperature difference T2 (the temperature difference T2 is the temperature difference between the inner and outer walls of the infusion tube, accurately measured in laboratory conditions during the R&D phase, at a temperature range of 25℃ to 35℃). The microcontroller uses a PID algorithm to precisely control the actual temperature T of the medication solution to approach the target temperature, where the target temperature is ≤35℃. The specific PID algorithm is as follows: Tn= Kp*(Tn - Qn-1)+Ki*Tn+Kd(Tn-2*Tn-1+Tn-2); Kp, Ki, and Kd are the optimal variables obtained from testing during the design phase and written into the microcontroller software code. Tn, Tn-1, and Tn-2 are the temperatures T at the current time n, the previous time n-1, and the time before that n-1, respectively.

[0070] Anti-backflow / Air injection: To prevent air from being injected into the infusion tubing when the medication is finished, which can cause danger and venous backflow, the intelligent infusion metering control device controls the flow rate when the medication is about to be finished, ensuring that the last dose of medication is injected slowly to prevent air from being introduced and venous backflow.

[0071] Creating cloud archives: Refer to Figure 7The intelligent infusion metering control device can be linked to hospital prescriptions and medical records. After prescribing intravenous medication, medical staff can use the device's peripherals to select information such as the type of medication, patient age, and syringe type transmitted from the hospital's backend during the intravenous injection phase. The device automatically pushes information such as infusion rate and heating temperature, which medical staff can select with one click. The device can even use its built-in barcode scanner to scan the QR code on the infusion bag / bottle to select historical or recommended settings, which is convenient and quick, avoiding the trouble and operational errors of manual settings. The infusion information is transmitted to the backend to form a record, especially for allergy medication infusions, which facilitates future medical treatment. This ensures that every step of the medical process is documented and achieves AI-powered intelligence.

[0072] Charging function and battery life calculation: This intelligent infusion metering control device has a built-in battery that is charged by an external charger. After each power-on, the device calculates the battery level in real time and compares it with the infusion time calculated from the drug information and infusion rate transmitted from the cloud archive. If the remaining battery life is less than the threshold associated with the infusion time required, the device will remind medical staff that the battery is low and the device needs to be replaced.

[0073] (1) The power estimation process is as follows: During the R&D phase, the power and output voltage of the built-in battery pack are tested to obtain a power-voltage correspondence table. Taking a single lithium battery of 3.7V as an example, the following example is given: Table 1. Relationship between remaining battery capacity and voltage

[0074] (2) Store the above correspondence in the Flash of the device and retrieve it after power-on; and during the experimental development stage, evaluate the normal power consumption rate p and store it in the Flash of the device.

[0075] (3) The voltage of the battery pack is sent to the ADC sampling port of the microcontroller through the voltage sampling circuit of the battery pack, and the value Ub is read.

[0076] (4) The microcontroller program runs and compares the real-time collected battery voltage Ub with the data in Table 1 to obtain the remaining power W. The remaining power W is divided by the normal power consumption rate p to obtain the battery life ta.

[0077] (5) The infusion time tb is obtained by transmitting the data from the cloud archive to the device and then calculating the "volume / infusion rate" of each package of medicine.

[0078] (6) Compare the battery's runtime ta with the infusion time tb in real time: Before infusion, if tb≤ta*150%, remind medical staff that the device has insufficient remaining power to support the complete infusion. During intravenous infusion, it is necessary to calculate in real time: Volume = Total drug volume - Infusion rate * Infusion time, and then use volume / infusion rate to obtain the infusion time tb. When tb ≤ ta * 150%, the medical staff should be reminded that the device has insufficient remaining power to support the complete infusion.

[0079] Self-test function: The intelligent infusion metering control device has a built-in self-test function. After each power-on, it performs a real-time self-test on each of its functional modules. Through the logically rigorous self-test function, it prevents the failure of a certain functional module from affecting the patient experience.

[0080] If peripheral devices (LED display and buttons), capacitive flow meter, flow rate control, temperature control, etc., malfunction, the information will be transmitted to the backend via cloud archives and displayed on the LED display. Medical staff will then replace the device, and the cloud archives will transmit the infusion information and patient information to the new device to continue the subsequent infusion operation.

[0081] If the WIFI / Bluetooth module is damaged and unable to transmit information to the backend, the LED display will show "Device damaged, infusion and patient information need to be re-entered".

[0082] Emergency alarm function: If a patient experiences discomfort during the infusion process, pressing the emergency button will notify the back office and medical staff, providing safety assurance.

[0083] This intelligent infusion metering and control device addresses every aspect of a patient's medical experience. It not only provides alarms for infusion completion but also flow rate information, and innovatively includes Wi-Fi or Bluetooth alarm functionality, electronic pump flow rate control, infusion heating, air injection prevention, LED screen and button peripherals, barcode sensor functionality, patient record archiving, external charging and battery life calculation, and self-testing. Unlike traditional infusion metering alarm devices, this device offers a superior medical experience, providing enhanced safety and a higher quality of life, especially for elderly and young patients.

[0084] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0085] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent infusion metering and control device, characterized in that, include: Processing unit; The flow rate control module includes a non-contact capacitive flow meter and a flow rate regulator. The non-contact capacitive flow meter is used to detect the flow rate of the medicine in the infusion tube in real time and send the flow rate detection signal to the processing unit. The flow rate regulator is used to adjust the flow cross section of the infusion tube according to the flow rate command of the processing unit to control the flow rate of the medicine. The temperature control module includes a temperature sensor and a heating unit. The temperature sensor is used to detect the temperature of the medicine in the infusion tube in real time and send the temperature detection signal to the processing unit. The heating unit heats the outer wall of the infusion tube according to the temperature command of the processing unit to control the temperature of the medicine. The processing unit is configured to: perform closed-loop control on the flow rate regulator based on the flow rate detection signal and a preset target flow rate to generate the flow rate command; and perform closed-loop control on the heating unit based on the temperature detection signal and a preset target temperature to generate the temperature command.

2. The intelligent infusion metering and control device according to claim 1, characterized in that, The non-contact capacitive flow meter includes two capacitor plates respectively disposed on both sides of the infusion tube, and the capacitance between the two capacitor plates constitutes the flow rate detection signal. The processing unit is also configured to determine the flow rate of the liquid medicine based on the capacitance.

3. The intelligent infusion metering and control device according to claim 1, characterized in that, The flow rate regulator is an electronically switched pump, which includes a screw driven by a motor and a pressure plate that cooperates with the screw. The motor is controlled by the flow rate command to drive the screw to move the pressure plate, which is used to squeeze the infusion tube to adjust the flow cross-section of the infusion tube.

4. The intelligent infusion metering and control device according to claim 1, characterized in that, The temperature sensor is an NTC temperature sensor that is closely attached to the outer wall of the infusion tube, and the heating unit includes a heating plate that is closely attached to the outer wall of the infusion tube.

5. The intelligent infusion metering and control device according to claim 1, characterized in that, The processing unit uses a PID control algorithm to perform closed-loop control on the flow rate regulator and the heating unit respectively.

6. The intelligent infusion metering and control device according to claim 1, characterized in that, The processing unit is also configured to execute infusion end safety protection logic: when the remaining infusion time is less than a preset threshold, control the flow rate regulator to gradually compress the flow cross-section of the infusion tube to gradually reduce the drug flow rate.

7. The intelligent infusion metering and control device according to claim 1, characterized in that, It also includes QR code scanners; The QR code scanner is used to input infusion parameters and send them to the processing unit. The infusion parameters include the target flow rate and the target temperature.

8. The intelligent infusion metering and control device according to claim 1, characterized in that, It also includes a wireless communication module and / or a display; The processing unit is further configured to: determine the liquid flow rate and liquid temperature based on the flow rate detection signal and the temperature detection signal, respectively, and send the liquid flow rate and liquid temperature to an external device via the wireless communication module and / or display the liquid flow rate and liquid temperature via the display.

9. The intelligent infusion metering and control device according to claim 8, characterized in that, The wireless communication module includes a WIFI module and / or a Bluetooth module.

10. The intelligent infusion metering and control device according to claim 9, characterized in that, It also includes an emergency button connected to the processing unit; The processing unit is also configured to send an alarm signal to the external device via the wireless communication module when the emergency button is detected to be triggered.

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