Portable intelligent infusion pressurization and flow rate control system

Abstract

The invention relates to the technical field of medical equipment, in particular to a portable intelligent infusion pressurization and flow rate control system. The system comprises a central control unit, a sensor monitoring module, an infusion pressurization module, a flow rate control module, a man-machine interaction module and a power management module, the central control unit is connected with all the modules, and a temperature-pressure cooperative compensation algorithm used for calculating target pressure is arranged in the central control unit. The sensor monitoring module comprises a temperature sensor, a pressure sensor and an ultrasonic sensor; the infusion pressurization module comprises a left side fixed clamping plate, a right side movable clamping plate, an electric push rod, an inflation bag, a micro air pump and a pressure release valve; the central control unit determines the target pressure according to the liquid temperature and the flow velocity deviation, drives the infusion pressurization module to adjust the space between the clamping plates to enable the inflation bag to apply pressure to the infusion bag, and drives the flow velocity control module to adjust the rotating speed of the peristaltic pump to achieve cooperative control of infusion pressurization and flow velocity.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a portable intelligent infusion pressurization and flow rate control system. Background Technology

[0002] During field medical rescue or transport to remote areas, traditional infusion systems rely on hanging infusion bags to provide gravity pressure, which is not only inconvenient to operate but also easily affected by the environment. In cold conditions, the viscosity of the infusion fluid increases significantly, causing fluctuations in the flow rate. At the same time, the infusion bag cannot be placed in the patient's rewarming bag to keep it warm, resulting in the fluid temperature being too low, causing infusion interruption or patient discomfort. Existing equipment lacks a temperature-pressure co-compensation mechanism, and bubble detection relies primarily on mechanical flow stop clamps. This makes it impossible to dynamically adjust infusion parameters in real time, resulting in a high risk of air embolism and poor system reliability, severely restricting the efficiency and safety of field medical care. Existing technology discloses a portable electric infusion pump that controls flow rate through a peristaltic pump and integrates basic bubble detection functions, but it does not solve the temperature-pressure coupling problem in cold environments. Furthermore, this device only maintains a fixed pressure under low-temperature conditions and cannot dynamically adjust the pressure according to changes in liquid viscosity, resulting in large flow rate fluctuations. At the same time, bubble detection still relies on mechanical flow stop clamps, and the response delay is far from meeting clinical safety requirements. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a portable intelligent infusion pressurization and flow rate control system. The system includes a central control unit, a sensor monitoring module, an infusion pressurization module, a flow rate control module, a human-machine interface module, and a power management module. The central control unit is connected to each module and has a built-in temperature-pressure collaborative compensation algorithm for calculating the target pressure. The sensor monitoring module includes a temperature sensor, a pressure sensor, and an ultrasonic sensor. The infusion pressurization module includes a left fixed clamp, a right movable clamp, an electric actuator, an inflation bag, a miniature air pump, and a pressure relief valve. The flow rate control module includes a peristaltic pump. This invention uses the central control unit to determine the target pressure based on the liquid temperature and flow rate deviation, driving the infusion pressurization module to adjust the clamp spacing to apply pressure from the inflation bag to the infusion bag. Simultaneously, it drives the flow rate control module to adjust the peristaltic pump speed, achieving coordinated control of infusion pressurization and flow rate.

[0004] This invention adopts the following technical solution: a portable intelligent infusion pressurization and flow rate control system, comprising: The central control unit, including a microcontroller, is connected to the sensor monitoring module, the infusion pressurization module, the flow rate control module, the human-machine interaction module, and the power management module via interfaces. The microcontroller has a built-in temperature-pressure collaborative compensation algorithm, which is used to receive data collected by the sensor monitoring module, dynamically calculate the target pressure, and generate control commands based on the target pressure to send to the infusion pressurization module and the flow rate control module. The sensor monitoring module, including a temperature sensor, a pressure sensor, and an ultrasonic sensor, is used to monitor liquid temperature, air bag pressure, liquid flow rate, and bubble data, and send them to the central control unit. The infusion pressurization module includes a left fixed clamp, a right movable clamp, an electric actuator, an inflation bag, a miniature air pump, and a pressure relief valve. It is used to pre-inflate the inflation bag with gas via the miniature air pump to create a base pressure. During infusion, it receives control commands from the central control unit and uses a closed-loop control algorithm to drive the electric actuator to adjust the position of the right movable clamp. By changing the distance between the left fixed clamp and the right movable clamp, the inflation bag applies adjustable pressure to the infusion bag until the target pressure is reached. A pressure sensor monitors the inflation bag pressure in real time, and the pressure relief valve automatically releases pressure when the pressure applied by the inflation bag exceeds a safety threshold. The flow rate control module includes a peristaltic pump, which receives control commands from the central control unit, adjusts the speed of the peristaltic pump according to the control commands, and regulates the liquid flow rate by periodically squeezing the infusion tube. The human-computer interaction module includes a display screen, which is connected to the central control unit and is used to receive infusion parameters input by the user and transmit them to the central control unit, and to display system status data during the infusion process; The power management module includes a rechargeable battery and a power conversion circuit. It is used to convert the voltage of the rechargeable battery into the operating voltage of each module through the power conversion circuit, and to monitor the battery power in real time and send it to the central control unit.

[0005] Furthermore, the system also includes a rewarming bag; The warming bag is a bag body that contains the infusion bag. The bag body is provided with an insulation layer and a PTC ceramic heating film. The PTC ceramic heating film is connected to the power management module and is used to heat the liquid in the infusion bag according to the control command sent by the central control unit.

[0006] Furthermore, the central control unit incorporates a temperature-pressure collaborative compensation algorithm, specifically as follows: The temperature compensation pressure value is determined based on the liquid temperature collected by the temperature sensor, the preset reference pressure, and the dynamic viscosity compensation coefficient. The flow rate correction pressure value is determined based on the liquid flow rate collected by the ultrasonic sensor and the preset target flow rate. The target pressure value is obtained by superimposing the temperature-compensated pressure value and the flow rate-corrected pressure value.

[0007] Furthermore, in the infusion pressurization module, the left fixed clamp is fixed to the inner wall of the rewarming bag, serving as a fixed support back plate in contact with one side of the infusion bag; the right movable clamp is fixed to the outside of the inflation bag in a relatively opposite manner to the left fixed clamp, for applying pressure to the infusion bag through the inflation bag; the electric actuator is connected to the center of the outside of the right movable clamp, for driving the right movable clamp to move towards the left fixed clamp; the inflation bag is a flexible sealed bag body, set between the right movable clamp and the infusion bag, for evenly distributing the pressure applied by the right movable clamp to the surface of the infusion bag; the micro air pump is connected to the air inlet of the inflation bag through an air pipe, and the pressure relief valve is connected to the air outlet of the inflation bag through an air pipe.

[0008] Furthermore, the closed-loop control algorithm used in the infusion pressurization module is a nonlinear PID algorithm, specifically including: The pressure of the inflatable bag is acquired by the pressure sensor, and the pressure deviation value is obtained based on the target pressure sent by the central control unit and the pressure of the inflatable bag. The proportional adjustment amount in the nonlinear PID algorithm is obtained based on the absolute value of the pressure deviation. The integral adjustment value in the nonlinear PID algorithm is obtained by integrating the pressure deviation value. The derivative adjustment value in the nonlinear PID algorithm is obtained by taking the derivative value of the pressure deviation. The drive command for the electric actuator is obtained by superimposing the proportional adjustment, integral adjustment and derivative adjustment. The electric actuator is driven according to the driving command to adjust the position of the right movable clamp.

[0009] Furthermore, in the sensor monitoring module, the temperature sensor is fixed to the outer wall of the infusion bag via a flexible silicone patch; the pressure sensor is connected to the outside of the inflation bag via a sealed O-ring interface; and the ultrasonic sensor is fixed to the outer wall of the infusion tube via a magnetic base.

[0010] The beneficial effects of this invention are as follows: By setting a temperature-pressure collaborative compensation algorithm in the central control unit, this invention dynamically calculates and adjusts the target pressure based on real-time data collected by the sensor monitoring module, including liquid temperature, inflation bag pressure, liquid flow rate, and bubble data, to compensate for the increased viscosity caused by low temperature, thereby maintaining a stable flow rate. It also coordinates the infusion pressurization module and the flow rate control module. Specifically, the infusion pressurization module uses a left fixed clamp and a right movable clamp driven by an electric actuator to change the clamp spacing, allowing the inflation bag to apply uniform and adjustable pressure to the infusion bag. A miniature air pump is used for initial pre-inflation, and a pressure relief valve provides over-pressure protection. The flow rate control module receives control commands from a peristaltic pump to adjust its rotation speed, achieving continuous and precise control of the liquid flow rate. The human-machine interface module facilitates real-time monitoring and operation by medical personnel, and the power management module ensures continuous and stable power supply to the system in field environments. The system proposed in this invention, through the collaborative work of its modules, enables the system to automatically adjust the infusion pressure and flow rate according to changes in ambient temperature and flow rate, ensuring a precise, safe, and stable infusion process. It is suitable for various complex scenarios such as field rescue and battlefield first aid. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of a portable intelligent infusion pressurization and flow rate control system according to an embodiment of the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] A schematic diagram of a portable intelligent infusion pressurization and flow rate control system according to an embodiment of the present invention is shown below. Figure 1 As shown, it includes: The central control unit, including a microcontroller, is connected to the sensor monitoring module, the infusion pressurization module, the flow rate control module, the human-machine interaction module, and the power management module via interfaces. The microcontroller has a built-in temperature-pressure collaborative compensation algorithm, which is used to receive data collected by the sensor monitoring module, dynamically calculate the target pressure, and generate control commands based on the target pressure to send to the infusion pressurization module and the flow rate control module. In this embodiment of the invention, the central control unit can use a microcontroller as the core processing hub of the system. Its core function is to receive data on liquid temperature, air bag pressure, liquid flow rate and bubbles transmitted from the sensing and detection module, perform dynamic calculations using a temperature-pressure collaborative compensation algorithm, and accurately send the processed control commands to the infusion pressurization module and the flow rate control module.

[0015] In one specific embodiment of the present invention, after the system starts, the central control unit receives liquid temperature data from the temperature sensor via a 1-Wire bus, receives the inflation bag pressure value from the pressure sensor via an ADC interface, and simultaneously obtains flow rate and bubble detection results from the ultrasonic bubble sensor and ultrasonic flow meter via an SPI interface, respectively. At the algorithm level, the unit's built-in ARM Cortex-M4 microcontroller performs temperature-pressure compensation calculations in real time. One calculation method is given here: when the temperature... At the same time, the target pressure is dynamically calculated. ,in Preset reference pressure (e.g.) ), For dynamic compensation coefficients, To preset the maximum safe pressure of the system, when the target pressure reaches the maximum pressure value, the central control unit immediately triggers the enhanced heating mode of the rewarming bag and displays a warning message on the human-machine interface that the pressure has reached the upper limit and the rewarming bag is heating at full capacity. At the same time, the flow rate control module continuously monitors the actual flow rate. If the flow rate is 20% lower than the set value for 30 seconds, a level two alarm for insufficient flow rate is triggered to prompt medical staff to intervene.

[0016] For the dynamic compensation coefficient in the dynamic calculation of the target pressure, this embodiment of the invention also embeds an RFID chip in the infusion bag label, and then divides the calibration into the following two modes according to the reading method: the first is the liquid category adaptive mode: the RFID reader integrated into the inlet of the rewarming bag automatically identifies the infusion bag label chip, thereby retrieving the pre-stored liquid model library parameters; the second is the on-site self-calibration mode: if the RFID is not identified or the user selects the self-calibration mode, the system will automatically adjust the calibration at the initial temperature. The infusion is driven at a preset reference pressure for 10 seconds, and the reference flow rate is collected by an ultrasonic sensor. Preset reference flow rate To calculate the calibration value of the dynamic compensation coefficient Then, replace the dynamic compensation coefficient in the formula with this calibration value. The target pressure calculated at this time is the temperature compensation pressure value.

[0017] For example, when RFID identifies it as whole blood and the temperature sensor provides feedback... hour, The central control unit will automatically calculate. If it is physiological saline, then , Simultaneously, the central control unit inputs the flow velocity deviation monitored by the ultrasonic sensor into the flow velocity compensation algorithm. In this embodiment of the invention, the flow velocity compensation algorithm is calculated using the standard PID formula, namely: peristaltic pump PWM adjustment command. ,in To compensate for flow rate error, the PID parameters are dynamically adjusted based on the liquid type; when the ultrasonic sensor detects a flow rate deviation... At that time, a peristaltic pump PWM adjustment command is generated and sent to the flow rate control module via the SPI interface. Specifically, when the ultrasonic sensor detects a deviation between the actual flow rate and the preset target flow rate, the system calculates the flow rate using a PID algorithm. The value, whose sign and magnitude reflect the direction and extent of adjustment required; for example, if the actual flow rate is lower than the target flow rate, When the value is positive, the system increases the PWM duty cycle to increase the peristaltic pump speed, thereby accelerating the infusion rate; conversely, it decreases the duty cycle to reduce the speed, ultimately stabilizing the actual flow rate near the target value. At this time, a flow rate correction pressure value is generated simultaneously. The value of this pressure fine-tuning is in Within the specified range, the pressure is superimposed on the temperature-compensated pressure value and then clamped to obtain the target pressure value. This value is then sent to the infusion pressurization module for adjustment via an electric actuator.

[0018] In this embodiment of the invention, the central control unit also transmits the system status (temperature, pressure, flow rate, battery level) to the human-machine interface for display in real time via a 1-Wire bus, and immediately sends an emergency stop command to the flow rate control module when bubbles or pressure exceeding limits are detected. For bubble detection, after parsing the ultrasonic data packet, if... , here If the detection threshold can be obtained based on clinical safety standards, the central control unit will immediately trigger a high-priority emergency stop command, forcing the flow rate control module to stop the peristaltic pump via the SPI interface; pressure over-limit detection is based on... When the safety threshold is exceeded, the central control unit automatically activates the pressure relief valve control command.

[0019] The sensor monitoring module, including a temperature sensor, a pressure sensor, and an ultrasonic sensor, is used to monitor liquid temperature, air bag pressure, liquid flow rate, and bubble data, and send them to the central control unit. In this embodiment of the invention, the temperature sensor is fixed to the outer wall of the infusion bag via a flexible silicone patch; the pressure sensor is connected to the outside of the inflation bag via a sealed O-ring interface; and the ultrasonic sensor is fixed to the outer wall of the infusion tube via a magnetic base. Specifically, the temperature sensor collects liquid temperature data once per second and transmits a 3-byte data packet to the central control unit via a 1-Wire bus; the pressure sensor is connected to the ADC input of the unit via an analog signal line and converts the pressure value into a 12-bit digital value every 20ms and sends it to the central control unit; the ultrasonic sensor sends a 5-byte data packet via SPI every 50ms. These data are fused in real time in the central control unit: the temperature data is used to calculate the temperature compensation pressure value, which is used to control the electric actuator; and the flow rate data is used to calculate the peristaltic pump PWM master control and the flow rate correction pressure value in the outer loop. Bubble data is used to trigger an emergency safety shutdown. Communication between this module and the central control unit employs shielded twisted-pair cable and an RC filter circuit, ensuring data transmission accuracy exceeds 99.5% even in outdoor electromagnetic interference environments, providing highly reliable input for closed-loop control.

[0020] The infusion pressurization module includes a left fixed clamp, a right movable clamp, an electric actuator, an inflation bag, a miniature air pump, and a pressure relief valve. It is used to pre-inflate the inflation bag with gas via the miniature air pump to create a base pressure. During infusion, it receives control commands from the central control unit and uses a closed-loop control algorithm to drive the electric actuator to adjust the position of the right movable clamp. By changing the distance between the left fixed clamp and the right movable clamp, the inflation bag applies adjustable pressure to the infusion bag until the target pressure is reached. A pressure sensor monitors the inflation bag pressure in real time, and the pressure relief valve automatically releases pressure when the pressure applied by the inflation bag exceeds a safety threshold. In this embodiment of the invention, the system structure also includes a warming bag, which is a bag body that contains the infusion bag. It is tightly attached to the outer wall of the infusion bag using flexible thermally conductive adhesive. An insulation layer and a PTC ceramic heating film are disposed inside the bag. The PTC ceramic heating film is connected to the power management module and is used to heat the liquid inside the infusion bag according to control commands sent by the central control unit. When the temperature sensor detects that the liquid temperature is lower than the set temperature, the central control unit sends a command to the power management module via a 1-Wire bus. The power management module immediately outputs a constant current of 5V / 2A to drive the PTC heating film to work, quickly heating the liquid to the set temperature. Simultaneously, the self-limiting temperature characteristic of the PTC ensures that the temperature remains stable within a safe range. In cold environments, the system dynamically adjusts the heating power every 10 seconds to avoid temperature overshoot, effectively preventing a drop in the patient's core body temperature caused by the input of low-temperature liquid.

[0021] The infusion pressurization module is structured as follows: a left fixed clamp is fixed to the inner wall of the rewarming bag, serving as a fixed support back plate in contact with one side of the infusion bag; the right movable clamp is fixed to the outside of the inflation bag in a relatively opposite manner to the left fixed clamp, for applying pressure to the infusion bag through the inflation bag; an electric actuator is connected to the center of the outside of the right movable clamp, for driving the right movable clamp to move towards the left fixed clamp; the inflation bag is a flexible sealed bag body, located between the right movable clamp and the infusion bag, for evenly distributing the pressure applied by the right movable clamp to the surface of the infusion bag; a micro air pump is connected to the air inlet of the inflation bag through an air pipe, and a pressure relief valve is connected to the air outlet of the inflation bag through an air pipe.

[0022] In a specific embodiment of the present invention, the core function of the infusion pressurization module is to dynamically adjust the clamping plate spacing according to the target pressure issued by the central control unit. The module adopts a closed-loop control mode. The central control unit uses the target pressure as the set value. The nonlinear PID controller in the module compares the real-time pressure feedback value of the pressure sensor with the target pressure in real time, dynamically calculates the PWM command of the electric actuator, and drives the right clamping plate to move until the real-time pressure value stably tracks the target pressure.

[0023] Specifically, the mapping relationship between the electric actuator and the pressure is as follows: a nonlinear curve between the clamping plate spacing and the inflation bag pressure is established based on pre-calibration experiments and stored in the central control unit; the nonlinear PID algorithm is expressed as follows: In the formula, This is the drive command for the electric linear actuator. This is the pressure deviation value. The integral coefficient is... These are the differential coefficients. For the integral term of deviation, The differential term of the deviation, the proportional adjustment amount Dynamic adjustment: when hour (Rapid response); when hour (Smooth transition); when hour (Suppress overshoot).

[0024] The integral adjustment adopts an anti-saturation strategy when The integral is paused at time, and the differential adjustment is superimposed on the first-order low-pass filter to suppress mechanical vibration noise.

[0025] The execution process is as follows: First, the central control unit updates the target pressure to the dual buffer zone every 200ms; second, the pressure sensor provides real-time feedback on the pressure of the inflatable bag; then, the nonlinear PID controller reads the latest target pressure every 20ms to calculate the PWM command for the electric actuator; this drives the right clamp to dynamically adjust the spacing to the pressure target position, compressing the infusion bag within the rigid boundary of the rewarming bag; finally, the inflatable bag acts as a buffer layer to absorb mechanical impact, stabilizing its pressure at the target pressure; simultaneously, the pressure sensor monitors the real-time pressure of the inflatable bag, converting the real-time pressure value into a 12-bit digital value via analog signal and feeding it back to the central control unit via the ADC interface; the pressure relief valve releases pressure when it exceeds the safety limit. It automatically turns on when the full threshold is reached, and its on / off status is transmitted back to the central control unit in real time via the digital input port. In the collaborative workflow, when the central control unit calculates the target pressure, it sends a command to the electric actuator, causing the right clamp to move to the left, reducing the clamp spacing. The infusion bag is compressed within the rigid boundary of the rewarming bag, increasing the pressure. After the pressure sensor feeds back the pressure value, the central control unit maintains the command. If the ambient temperature drops sharply to 25°C, the central control unit dynamically adjusts the target pressure value based on the temperature. The nonlinear PID controller recalculates the PWM command in real time, the electric actuator fine-tunes the clamp position, and commands the electric actuator to further reduce the gap. The pressure sensor synchronously feeds back the pressure change.

[0026] The flow rate control module includes a peristaltic pump, which receives control commands from the central control unit, adjusts the speed of the peristaltic pump according to the control commands, and regulates the liquid flow rate by periodically squeezing the infusion tube. In this embodiment of the invention, the core function of the flow rate control module is to precisely adjust the peristaltic pump speed according to the instructions of the central control unit and to detect bubbles in real time to ensure infusion safety. Specifically, the flow rate control module receives PWM duty cycle instructions sent by the central control unit through the SPI interface to drive the peristaltic pump speed, achieving continuous stepless adjustment of the flow rate. Simultaneously, the flow rate and bubble data from the ultrasonic sensor are input to the central control unit through the SPI interface. The central control unit calculates the flow rate deviation based on this data and generates a new PWM instruction, which is then sent to the flow rate control module. In the safety coordination, when the ultrasonic sensor detects a bubble volume greater than a certain value... At that time, its data packet is immediately parsed by the central control unit, and a high-priority stop command is sent to the peristaltic pump to forcibly stop the infusion. At the same time, a red alarm is triggered on the human-machine interface. The peristaltic pump roller mechanism of the flow rate control module mechanically squeezes the infusion tubing, and its working status is transmitted back to the central control unit through digital feedback signals.

[0027] The human-computer interaction module includes a display screen, which is connected to the central control unit. The display screen is used to receive infusion parameters input by the user and transmit them to the central control unit, and to display system status data during the infusion process. In this embodiment of the invention, the core function of the human-computer interaction module is to provide a user operation entry point and display the system status in real time, enabling two-way data interaction. Specifically, the human-computer interaction module receives system status data sent by the central control unit via a 1-Wire bus and presents it graphically on a 1.5-inch LCD screen. Simultaneously, the screen also has touch interaction functionality, allowing users to input infusion parameters via the touch display. These parameters are converted into digital signals by the touch control chip and sent to the central control unit for processing via the 1-Wire bus. During operation, when the central control unit calculates that temperature compensation triggering is required, it sends a status command to the interface. The interface automatically highlights that temperature compensation is activated and prompts that the rewarming bag needs to be enabled. If air bubbles are detected, the interface immediately displays a red warning: "Air bubble detection! Infusion stopped." The communication between the human-computer interaction module and the central control unit uses a low-power 1-Wire bus, ensuring a data transmission delay of less than 10ms during field use. Furthermore, the interface prompt logic is completely embedded in the central control unit firmware; those skilled in the art only need to embed the preset prompt text into the code for direct reuse without additional development.

[0028] The power management module includes a rechargeable battery and a power conversion circuit. It is used to convert the voltage of the rechargeable battery into the operating voltage of each module through the power conversion circuit, and to monitor the battery power in real time and send it to the central control unit.

[0029] In this embodiment of the invention, the core function of the power management module is to provide a stable power supply to the system and monitor the battery status in real time, ensuring continuous and reliable operation in outdoor environments. Specifically, the module converts the 3.7V lithium battery input to 5V and 3.3V outputs via a DC-DC converter to power the central control unit, sensor module, and several other modules. Simultaneously, the battery management chip collects battery voltage and temperature data every 5 seconds and sends the digital signals to the central control unit via a 1-Wire bus. In the collaborative workflow, when the central control unit detects that the battery level is less than 20%, it immediately sends a command to the power management module to trigger a power reduction mode and simultaneously sends a low battery warning (2 hours of battery life) to the human-machine interface. In low-temperature environments, the power management module prioritizes the operation of the temperature compensation algorithm to prevent pressure compensation failure due to power fluctuations. In this embodiment of the invention, the power management module adopts an industrial-grade design with an input voltage range of 3.0-4.2V and an output ripple of less than 50mV, ensuring stable operation in outdoor conditions from -10°C to 40°C. Those skilled in the art can simply select a standard module and connect it according to the circuit diagram for plug-and-play functionality, without the need for custom development.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable intelligent infusion pressurization and flow rate control system, characterized in that, include: The central control unit, including a microcontroller, is connected to the sensor monitoring module, the infusion pressurization module, the flow rate control module, the human-machine interaction module, and the power management module via interfaces. The microcontroller has a built-in temperature-pressure collaborative compensation algorithm, which is used to receive data collected by the sensor monitoring module, dynamically calculate the target pressure, and generate control commands based on the target pressure to send to the infusion pressurization module and the flow rate control module. The sensor monitoring module, including a temperature sensor, a pressure sensor, and an ultrasonic sensor, is used to monitor liquid temperature, air bag pressure, liquid flow rate, and bubble data, and send them to the central control unit. The infusion pressurization module includes a left fixed clamp, a right movable clamp, an electric actuator, an inflation bag, a miniature air pump, and a pressure relief valve. It is used to pre-inflate the inflation bag with gas via the miniature air pump to create a base pressure. During infusion, it receives control commands from the central control unit and uses a closed-loop control algorithm to drive the electric actuator to adjust the position of the right movable clamp. By changing the distance between the left fixed clamp and the right movable clamp, the inflation bag applies adjustable pressure to the infusion bag until the target pressure is reached. A pressure sensor monitors the inflation bag pressure in real time, and the pressure relief valve automatically releases pressure when the applied pressure exceeds a safety threshold. The flow rate control module includes a peristaltic pump, which receives control commands from the central control unit, adjusts the speed of the peristaltic pump according to the control commands, and regulates the liquid flow rate by periodically squeezing the infusion tube. The human-computer interaction module includes a display screen, which is connected to the central control unit and is used to receive infusion parameters input by the user and transmit them to the central control unit, and to display system status data during the infusion process; The power management module includes a rechargeable battery and a power conversion circuit. It is used to convert the voltage of the rechargeable battery into the operating voltage of each module through the power conversion circuit, and to monitor the battery power in real time and send it to the central control unit.

2. The portable intelligent infusion pressurization and flow rate control system according to claim 1, characterized in that: The system also includes a warming bag, which is a bag body that contains the infusion bag. The bag body is provided with an insulation layer and a PTC ceramic heating film. The PTC ceramic heating film is connected to the power management module and is used to heat the liquid in the infusion bag according to the control command sent by the central control unit.

3. The portable intelligent infusion pressurization and flow rate control system according to claim 1, characterized in that: The central control unit has a built-in temperature-pressure collaborative compensation algorithm, specifically as follows: The temperature compensation pressure value is determined based on the liquid temperature collected by the temperature sensor, the preset reference pressure, and the dynamic viscosity compensation coefficient. The flow rate correction pressure value is determined based on the liquid flow rate collected by the ultrasonic sensor and the preset target flow rate. The target pressure value is obtained by superimposing the temperature-compensated pressure value and the flow rate-corrected pressure value.

4. The portable intelligent infusion pressurization and flow rate control system according to claim 2, characterized in that: In the infusion pressurization module, the left fixed clamp is fixed to the inner wall of the rewarming bag, serving as a fixed support back plate in contact with one side of the infusion bag; the right movable clamp is fixed to the outside of the inflation bag in a relatively opposite manner to the left fixed clamp, and is used to apply pressure to the infusion bag through the inflation bag; the electric actuator is connected to the center of the outside of the right movable clamp, and is used to drive the right movable clamp to move towards the left fixed clamp; the inflation bag is a flexible sealed bag body, set between the right movable clamp and the infusion bag, and is used to evenly distribute the pressure applied by the right movable clamp to the surface of the infusion bag; the micro air pump is connected to the air inlet of the inflation bag through an air pipe, and the pressure relief valve is connected to the air outlet of the inflation bag through an air pipe.

5. The portable intelligent infusion pressurization and flow rate control system according to claim 1, characterized in that: The closed-loop control algorithm used in the infusion pressurization module is a nonlinear PID algorithm, specifically including: The pressure of the inflatable bag is acquired by the pressure sensor, and the pressure deviation value is obtained based on the target pressure sent by the central control unit and the pressure of the inflatable bag. The proportional adjustment amount in the nonlinear PID algorithm is obtained based on the absolute value of the pressure deviation. The integral adjustment value in the nonlinear PID algorithm is obtained by integrating the pressure deviation value. The derivative adjustment value in the nonlinear PID algorithm is obtained by taking the derivative value of the pressure deviation. The drive command for the electric actuator is obtained by superimposing the proportional adjustment, integral adjustment and derivative adjustment. The electric actuator is driven according to the driving command to adjust the position of the right movable clamp.

6. The portable intelligent infusion pressurization and flow rate control system according to claim 1, characterized in that: In the sensor monitoring module, the temperature sensor is fixed to the outer wall of the infusion bag via a flexible silicone patch; the pressure sensor is connected to the outside of the inflation bag via a sealed O-ring interface; and the ultrasonic sensor is fixed to the outer wall of the infusion tube via a magnetic base.

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