Calibrating device for gastric lavage machine

Abstract

The invention discloses a gastric lavage machine calibration device, which belongs to the technical field of intelligent sensing and comprises an MCU (Microprogrammed Control Unit), an ADC (Analog to Digital Converter), an LCD (Liquid Crystal Display), a USB (Universal Serial Bus) interface, an indicator lamp, a reference voltage module, a pressure conversion unit, an inlet flowmeter interface, an outlet flowmeter interface, an electromagnetic valve control unit and a power supply module, the technical problem of integrated calibration of multi-parameter high-precision acquisition, real-time processing and abnormal response is solved, real-time acquisition and calculation of pressure, flow and liquid quantity are realized, the measurement precision and the system stability are remarkably improved, bidirectional flow monitoring is supported, the working state of the gastric lavage machine is truly restored, an abnormal detection and automatic cutoff protection mechanism is provided, and the working efficiency is improved. The test process is safe and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent sensing, and in particular relates to a gastric lavage machine calibration device. Background Art

[0002] Gastric lavage machines are commonly used in emergency and digestive system clinics, and their accuracy and safety directly impact treatment outcomes. Currently, commercially available gastric lavage machines often experience issues such as pressure detection inaccuracy, flowmeter response deviation, and fluid volume accumulation errors after long-term use. Therefore, in high-frequency use scenarios like hospitals, periodic calibration of gastric lavage machines is crucial to ensure their accuracy and reliability during operation.

[0003] Existing gastric lavage machine calibration methods mostly use a combination of manual testing and paper records, which has the following significant problems:

[0004] There is a lack of unified standardized electronic calibration devices, and the calibration process relies on manual judgment, resulting in poor repeatability.

[0005] Test data is mostly read and recorded manually, lacking digital management and storage capabilities, and is prone to errors or loss.

[0006] The safety protection mechanism is not perfect. Once the test is abnormal, there is a lack of effective linkage control measures (such as automatic power off, etc.). Summary of the Invention

[0007] The purpose of the present invention is to provide a gastric lavage machine calibration device, which solves the technical problems of integrated calibration of multi-parameter high-precision acquisition, real-time processing and abnormal response.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A gastric lavage machine calibration device includes an MCU, an ADC, an LCD, a USB interface, an indicator light, a reference voltage module, a pressure conversion unit, an inlet flow meter interface, an outlet flow meter interface, a solenoid valve control unit, and a power module. The ADC, LCD, USB interface, indicator light, inlet flow meter interface, outlet flow meter interface, and solenoid valve control unit are all connected to the MCU.

[0010] The pressure conversion unit is connected to the ADC, and the pressure conversion unit is also connected to a pressure gauge;

[0011] The solenoid valve control unit is connected to a solenoid valve;

[0012] The inlet flow meter interface and the outlet flow meter interface are connected to an inlet flow meter and an outlet flow meter respectively;

[0013] The reference voltage module provides reference voltage for ADC and pressure conversion unit;

[0014] The power module provides power for the MCU, ADC, LCD, indicator light, reference voltage module, pressure conversion unit, inlet flow meter interface, outlet flow meter interface and solenoid valve control unit;

[0015] The analog signal output by the pressure gauge is amplified and filtered by the LM358 op amp and then sent to the ADC. The ADC converts it into a 12-bit digital signal for the MCU to read and convert into pressure data.

[0016] The pulse signals of the two flow meters are directly captured by the MCU through two IO port timers, counted in real time, and converted into flow data;

[0017] All data results are displayed on the LCD and uploaded to the host computer through the USB interface;

[0018] When the pressure data is abnormal, the MCU controls the solenoid valve control unit through the IO port output, thereby driving the solenoid valve to operate and implement liquid cut-off protection for the inlet.

[0019] Preferably, the model of the MCU is STM32F103C8T6, the model of the ADC is ADS1232, the model of the reference voltage module is REF3225, and the model of the solenoid valve is STB2300.

[0020] Preferably, the power supply module includes a 24V power supply module, a 12V power supply module, a 5V power supply module and a 3.3V power supply module. The input end of the 24V power supply module is connected to an external AC power supply, and the output end outputs a 24VDC power supply; the input end of the 12V power supply module is connected to a 24VDC power supply, and the output end outputs a 12VDC power supply; the input end of the 5V power supply module is connected to a 12VDC power supply, and the output end outputs a 5VDC power supply; the input end of the 3.3V power supply module is connected to a 5VDC power supply, and the output end outputs a 3.3VDC power supply.

[0021] Preferably, the 24V power module is a 24VAC-DC power module, the 12V power module is a 24V to 12VDC-DC module, the 5V power module is LM7805, and the 3.3V power module is AMS-1117.

[0022] Preferably, the pressure conversion unit includes an operational amplifier IC1, an interface J1, a resistor R1, a resistor R3, a resistor R2, a resistor R4, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a capacitor C1, a capacitor C2 and a capacitor C3;

[0023] Pin 2 of interface J1 is connected to IN1+ pin of op amp IC1 through resistor R4, and pin 1 is connected to the output of 24V power module;

[0024] Pin 2 of the interface J1 is also connected to the ground wire through the resistor R1 and capacitor C1 connected in parallel;

[0025] The IN1- pin of the op amp IC1 is connected to the ground wire through the resistors R6 and R3 connected in series. The OUT1 pin of the op amp IC1 is connected to the IN2+ pin of the op amp IC1 through the resistor R9. The resistor R7 is connected between the OUT1 pin and the IN1- pin of the op amp IC1.

[0026] The connection node between the resistor R3 and the resistor R6 is connected to the reference voltage provided by the reference voltage module through the resistor R2;

[0027] Connect resistor R10 between OUT2 and IN2- pins of op amp IC1;

[0028] Capacitor C3 is a ground capacitor on the IN2+ pin of the op amp IC1. The OUT2 pin of capacitor C3 outputs a pressure signal VL3, which is sent to the ADC. That is, the OUT2 pin of capacitor C3 is connected to the AIN1P pin of the ADC.

[0029] The VCC terminal of capacitor C3 is connected to the output terminal of the 3.3V power module;

[0030] The inlet flow meter interface includes an interface J2 and a resistor R5, wherein pin 1 of the interface J2 is connected to the output end of the 3.3V power module, pin 2 is connected to an IO port of the MCU, and pin 3 is connected to the ground line. The resistor R5 is a pull-up resistor of pin 2 of the interface J2;

[0031] The outlet flow meter interface includes an interface J3 and a resistor R8. Pin 1 of the interface J3 is connected to the output end of the 3.3V power module, pin 2 is connected to an IO port of the MCU, and pin 3 is connected to the ground wire. The resistor R8 is a pull-up resistor of pin 2 of the interface J2.

[0032] Preferably, the solenoid valve control unit includes an interface J4, an optical coupler U1, a capacitor C4, a resistor R11, a resistor R12, a resistor R14, a diode D1, a field effect transistor Q1 and a resistor R13, pins 1 and 2 of the interface J4 are respectively connected to the cathode and anode of the diode D1, and the interface J4 is connected to the solenoid valve;

[0033] The cathode of diode D1 is connected to the output of the 24V power module through resistor R14, and the anode is connected to the D pole of field effect transistor Q1. The S pole of field effect transistor Q1 is connected to the ground wire, and the G pole is connected to pin 3 of optocoupler U1. Resistor R13 is connected between the S pole and G pole of field effect transistor Q1.

[0034] Pin 4 of the optocoupler U1 is connected to the output of the 24V power module through resistor R12, pin 2 is connected to an IO port of the MCU, and pin 1 is connected to the output of the 3.3V power module through resistor R11;

[0035] One end of capacitor C4 is connected to the output end of the 3.3V power module, and the other end is connected to pin 2 of the optocoupler U1.

[0036] The gastric lavage machine calibration device described in the present invention solves the technical problems of integrated calibration of multi-parameter high-precision acquisition, real-time processing and abnormal response. The present invention realizes real-time acquisition and calculation of pressure, flow and liquid volume, significantly improves measurement accuracy and system stability, supports two-way flow monitoring, truly restores the working state of the gastric lavage machine, and has abnormality detection and automatic flow interruption protection mechanisms to ensure the safety and reliability of the testing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic block diagram of the present invention;

[0038] Figure 2 It is a schematic block diagram of the power module of the present invention;

[0039] Figure 3 is a schematic block diagram of the pressure conversion unit of the present invention;

[0040] Figure 4 It is a schematic block diagram of the solenoid valve control unit of the present invention. DETAILED DESCRIPTION

[0041] Depend on Figures 1-4 A gastric lavage machine calibration device shown includes an MCU, an ADC, an LCD, a USB interface, an indicator light, a reference voltage module, a pressure conversion unit, an inlet flow meter interface, an outlet flow meter interface, a solenoid valve control unit, and a power module. The ADC, LCD, USB interface, indicator light, inlet flow meter interface, outlet flow meter interface, and solenoid valve control unit are all connected to the MCU.

[0042] The pressure conversion unit is connected to the ADC, and the pressure conversion unit is also connected to a pressure gauge;

[0043] The solenoid valve control unit is connected to a solenoid valve;

[0044] The inlet flow meter interface and the outlet flow meter interface are connected to an inlet flow meter and an outlet flow meter respectively;

[0045] The reference voltage module provides reference voltage for ADC and pressure conversion unit;

[0046] The power module provides power for the MCU, ADC, LCD, indicator light, reference voltage module, pressure conversion unit, inlet flow meter interface, outlet flow meter interface and solenoid valve control unit;

[0047] The power supply module includes a 24V power supply module, a 12V power supply module, a 5V power supply module and a 3.3V power supply module. The input end of the 24V power supply module is connected to an external AC power supply, and the output end outputs a 24VDC power supply; the input end of the 12V power supply module is connected to a 24VDC power supply, and the output end outputs a 12VDC power supply; the input end of the 5V power supply module is connected to a 12VDC power supply, and the output end outputs a 5VDC power supply; the input end of the 3.3V power supply module is connected to a 5VDC power supply, and the output end outputs a 3.3VDC power supply.

[0048] The analog signal output by the pressure gauge is amplified and filtered by the LM358 op amp and then sent to the ADC. The ADC converts it into a 12-bit digital signal for the MCU to read and convert into pressure data.

[0049] The pulse signals of the two flow meters are directly captured by the MCU through two IO port timers, counted in real time, and converted into flow data;

[0050] All data results are displayed on the LCD and uploaded to the host computer through the USB interface;

[0051] The pressure conversion unit includes an operational amplifier IC1, an interface J1, a resistor R1, a resistor R3, a resistor R2, a resistor R4, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a capacitor C1, a capacitor C2 and a capacitor C3;

[0052] In this embodiment, the operational amplifier IC1 is LM358.

[0053] Pin 2 of interface J1 is connected to IN1+ pin of op amp IC1 through resistor R4, and pin 1 is connected to the output of 24V power module;

[0054] Pin 2 of the interface J1 is also connected to the ground wire through the resistor R1 and capacitor C1 connected in parallel;

[0055] The IN1- pin of the op amp IC1 is connected to the ground wire through the resistors R6 and R3 connected in series. The OUT1 pin of the op amp IC1 is connected to the IN2+ pin of the op amp IC1 through the resistor R9. The resistor R7 is connected between the OUT1 pin and the IN1- pin of the op amp IC1.

[0056] The connection node between the resistor R3 and the resistor R6 is connected to the reference voltage provided by the reference voltage module through the resistor R2;

[0057] Connect resistor R10 between OUT2 and IN2- pins of op amp IC1;

[0058] Capacitor C3 is a ground capacitor on the IN2+ pin of the op amp IC1. The OUT2 pin of capacitor C3 outputs a pressure signal VL3, which is sent to the ADC. That is, the OUT2 pin of capacitor C3 is connected to the AIN1P pin of the ADC.

[0059] The VCC terminal of capacitor C3 is connected to the output terminal of the 3.3V power module;

[0060] The inlet flow meter interface includes an interface J2 and a resistor R5, wherein pin 1 of the interface J2 is connected to the output end of the 3.3V power module, pin 2 is connected to an IO port of the MCU, and pin 3 is connected to the ground line. The resistor R5 is a pull-up resistor of pin 2 of the interface J2;

[0061] The outlet flow meter interface includes an interface J3 and a resistor R8. Pin 1 of the interface J3 is connected to the output end of the 3.3V power module, pin 2 is connected to an IO port of the MCU, and pin 3 is connected to the ground wire. The resistor R8 is a pull-up resistor of pin 2 of the interface J2.

[0062] The solenoid valve control unit includes an interface J4, an optical coupler U1, a capacitor C4, a resistor R11, a resistor R12, a resistor R14, a diode D1, a field effect transistor Q1 and a resistor R13. Pins 1 and 2 of the interface J4 are connected to the cathode and anode of the diode D1 respectively. The interface J4 is connected to the solenoid valve;

[0063] The cathode of diode D1 is connected to the output of the 24V power module through resistor R14, and the anode is connected to the D pole of field effect transistor Q1. The S pole of field effect transistor Q1 is connected to the ground wire, and the G pole is connected to pin 3 of optocoupler U1. Resistor R13 is connected between the S pole and G pole of field effect transistor Q1.

[0064] Pin 4 of the optocoupler U1 is connected to the output of the 24V power module through resistor R12, pin 2 is connected to an IO port of the MCU, and pin 1 is connected to the output of the 3.3V power module through resistor R11;

[0065] One end of capacitor C4 is connected to the output end of the 3.3V power module, and the other end is connected to pin 2 of the optocoupler U1.

[0066] The model of the MCU is STM32F103C8T6, the model of the ADC is ADS1232, the model of the reference voltage module is REF3225, and the model of the solenoid valve is STB2300.

[0067] The 24V power module is a 24VAC-DC power module, the 12V power module is a 24V to 12VDC-DC module, the 5V power module is LM7805, and the 3.3V power module is AMS-1117.

[0068] When the pressure data is abnormal, the MCU controls the solenoid valve control unit through the IO port output, thereby driving the solenoid valve to operate and implement liquid cut-off protection for the inlet.

[0069] During use, the working principles and processes of each module are as follows:

[0070] Step 1: System initialization and self-test. After the operator connects to the mains, the power module (24V / 12V / 5V / 3.3V) supplies power to each part of the system step by step.

[0071] After the MCU starts, it initializes the ADC, LCD, timer, serial port, and reference voltage module REF3225.

[0072] REF3225 outputs a 2.5V reference voltage to the pressure conversion unit (including the op amp LM358) and the ADC module, providing a stable reference.

[0073] Step 2: Pipeline connection and pre-flushing. The operator connects the pipelines according to the standard: the gastric tube of the gastric lavage machine is connected to the inlet of the pipeline of the gastric lavage machine calibration device (connected to the inlet flow meter), the outlet of the gastric lavage machine calibration device (through the outlet flow meter) is connected to the liquid inlet of the bionic stomach container, and the gastric lavage machine discharge tube is connected to the liquid outlet of the bionic stomach container.

[0074] After the connection is completed, the gastric lavage machine is manually started to inject water into the bionic stomach container. At this time, the MCU collects the following data: pulses from the two flow meters at the inlet and outlet to confirm that the water flow is smooth; pressure data.

[0075] Step 3: When the gastric lavage machine is running, the pressure signal is collected by the pressure gauge, amplified by LM358, and then sent to the ADC for processing;

[0076] Step 4: Liquid volume accumulation calculation, MCU timer periodically collects pulse number, set, Nin and Nout are the inlet flow meter pulse number and outlet flow meter pulse number respectively;

[0077] The sampling period is Δt=0.5s.

[0078] Calculate instantaneous flow:

[0079] Qin=Kin×Nin÷Δt;

[0080] Qout=Kout×Nout÷Δt;

[0081] Among them, Qin and Qout are the instantaneous flow rate of the inlet and the instantaneous flow rate of the outlet, respectively, and Kin and Kout are the inlet flow calibration coefficient and the outlet flow calibration coefficient, respectively.

[0082] Calculate the average flow rate: Qavg = (Qin + Qout) ÷ 2;

[0083] Calculate the total liquid volume Vtotal:

[0084] Vtotal = ∑Qavg × Δt ÷ 60; that is, sum all Qavg calculated within 60 seconds.

[0085] Step 6: Automatic current cut-off protection mechanism, the MCU continuously executes the following monitoring logic:

[0086] Abnormal pressure protection:

[0087] Obtain the pressure data P output by the pressure gauge. If P<-0.1MPa or P>0.1MPa, the MCU controller drives the optocoupler to control the field effect transistor Q1 to drive the solenoid valve to close; at the same time, the LC D alarm prompts: abnormal pressure.

[0088] Flow imbalance protection:

[0089] If |Qin-Qout|>0.15×Qavg, the "traffic imbalance" prompt is triggered.

[0090] The gastric lavage machine calibration device described in the present invention solves the technical problems of integrated calibration of multi-parameter high-precision acquisition, real-time processing and abnormal response. The present invention realizes real-time acquisition and calculation of pressure, flow and liquid volume, significantly improves measurement accuracy and system stability, supports two-way flow monitoring, truly restores the working state of the gastric lavage machine, and has abnormality detection and automatic flow interruption protection mechanisms to ensure the safety and reliability of the testing process.

Claims

1. A gastric lavage machine calibration device, characterized by: It includes MCU, ADC, LCD, USB interface, indicator light, reference voltage module, pressure conversion unit, inlet flow meter interface, outlet flow meter interface, solenoid valve control unit and power module. ADC, LCD, USB interface, indicator light, inlet flow meter interface, outlet flow meter interface and solenoid valve control unit are all connected to MCU; The pressure conversion unit is connected to the ADC, and the pressure conversion unit is also connected to a pressure gauge; The solenoid valve control unit is connected to a solenoid valve; The inlet flow meter interface and the outlet flow meter interface are connected to an inlet flow meter and an outlet flow meter respectively; The reference voltage module provides reference voltage for ADC and pressure conversion unit; The power module provides power for the MCU, ADC, LCD, indicator light, reference voltage module, pressure conversion unit, inlet flow meter interface, outlet flow meter interface and solenoid valve control unit; The analog signal output by the pressure gauge is amplified and filtered by the LM358 op amp and then sent to the ADC. The ADC converts it into a 12-bit digital signal for the MCU to read and convert into pressure data. The pulse signals of the two flow meters are directly captured by the MCU through two IO port timers, counted in real time, and converted into flow data; All data results are displayed on the LCD and uploaded to the host computer through the USB interface; When the pressure data is abnormal, the MCU controls the solenoid valve control unit through the IO port output, thereby driving the solenoid valve to operate and implement liquid cut-off protection for the inlet.

2. A gastric lavage machine calibration device according to claim 1, characterized in that: The model of the MCU is STM32F103C8T6, the model of the ADC is ADS1232, the model of the reference voltage module is REF3225, and the model of the solenoid valve is STB2300.

3. A gastric lavage machine calibration device according to claim 1, characterized in that: The power supply module includes a 24V power supply module, a 12V power supply module, a 5V power supply module and a 3.3V power supply module. The input end of the 24V power supply module is connected to an external AC power supply, and the output end outputs a 24VDC power supply; the input end of the 12V power supply module is connected to a 24VDC power supply, and the output end outputs a 12VDC power supply; the input end of the 5V power supply module is connected to a 12VDC power supply, and the output end outputs a 5VDC power supply; the input end of the 3.3V power supply module is connected to a 5VDC power supply, and the output end outputs a 3.3VDC power supply.

4. A gastric lavage machine calibration device according to claim 3, characterized in that: The 24V power module is a 24VAC-DC power module, the 12V power module is a 24V to 12VDC-DC module, the 5V power module is LM7805, and the 3.3V power module is AMS-1117.

5. A gastric lavage machine calibration device according to claim 3, characterized in that: The pressure conversion unit includes an operational amplifier IC1, an interface J1, a resistor R1, a resistor R3, a resistor R2, a resistor R4, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a capacitor C1, a capacitor C2 and a capacitor C3; Pin 2 of interface J1 is connected to IN1+ pin of op amp IC1 through resistor R4, and pin 1 is connected to the output end of 24V power module; Pin 2 of the interface J1 is also connected to the ground wire through the resistor R1 and capacitor C1 connected in parallel; The IN1- pin of the op amp IC1 is connected to the ground wire through the resistors R6 and R3 connected in series. The OUT1 pin of the op amp IC1 is connected to the IN2+ pin of the op amp IC1 through the resistor R9. The resistor R7 is connected between the OUT1 pin and the IN1- pin of the op amp IC1. The connection node between the resistor R3 and the resistor R6 is connected to the reference voltage provided by the reference voltage module through the resistor R2; Connect resistor R10 between OUT2 and IN2- pins of op amp IC1; Capacitor C3 is a ground capacitor on the IN2+ pin of the op amp IC1. The OUT2 pin of capacitor C3 outputs a pressure signal VL3, which is sent to the ADC. That is, the OUT2 pin of capacitor C3 is connected to the AIN1P pin of the ADC. The VCC terminal of capacitor C3 is connected to the output terminal of the 3.3V power module; The inlet flow meter interface includes an interface J2 and a resistor R5, wherein pin 1 of the interface J2 is connected to the output end of the 3.3V power module, pin 2 is connected to an IO port of the MCU, and pin 3 is connected to the ground line. The resistor R5 is a pull-up resistor of pin 2 of the interface J2; The outlet flow meter interface includes an interface J3 and a resistor R8. Pin 1 of the interface J3 is connected to the output end of the 3.3V power module, pin 2 is connected to an IO port of the MCU, and pin 3 is connected to the ground wire. The resistor R8 is a pull-up resistor of pin 2 of the interface J2.

6. A gastric lavage machine calibration device according to claim 3, characterized in that: The solenoid valve control unit includes an interface J4, an optical coupler U1, a capacitor C4, a resistor R11, a resistor R12, a resistor R14, a diode D1, a field effect transistor Q1 and a resistor R13. Pins 1 and 2 of the interface J4 are connected to the cathode and anode of the diode D1 respectively. The interface J4 is connected to the solenoid valve; The cathode of diode D1 is connected to the output of the 24V power module through resistor R14, and the anode is connected to the D pole of field effect transistor Q1. The S pole of field effect transistor Q1 is connected to the ground wire, and the G pole is connected to pin 3 of optocoupler U1. Resistor R13 is connected between the S pole and G pole of field effect transistor Q1. Pin 4 of the optocoupler U1 is connected to the output of the 24V power module through resistor R12, pin 2 is connected to an IO port of the MCU, and pin 1 is connected to the output of the 3.3V power module through resistor R11; One end of capacitor C4 is connected to the output end of the 3.3V power module, and the other end is connected to pin 2 of the optocoupler U1.

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