An apparatus for monitoring and maintaining the pressure of a pneumatic device

Abstract

The utility model belongs to the medical instrument field technical field, concretely relates to a device for monitoring and maintaining air bag instrument pressure. Include: air pump (1), air suction pump (2), air pump solenoid valve switch (3), air suction pump solenvalve switch (4), air bag pressure control unit (5), air bag pressure acquisition unit (6), wherein, air pump (1), air suction pump (2) are connected pressure relief unit (5) through air pump solenoid valve switch (3), air suction pump solenvalve switch (4) respectively, and air bag pressure acquisition unit (6) is linked with pressure relief unit (5). Advantage: the utility model is through coping with having inserted air bag class patient, gathers the current pressure value of current pressure sensor, and forms the record, thereby instrument automatic analysis patient's state, simplifies the preparation work of this kind of patient, and the device provides simple man-machine interaction, with own reliable steady voltage algorithm, so that patient can quickly enter the operation state.

Description

Technical Field

[0001] This utility model belongs to the technical field of medical devices, specifically relating to a device for monitoring and maintaining the pressure of an airbag device. Background Technology

[0002] A cuff pressure monitor is an instrument used to detect and maintain the cuff pressure of the endotracheal tube. It is specifically used in respiratory anesthesia surgeries. During mechanical ventilation, the cuff pressure monitor continuously monitors and controls the cuff pressure, keeping it within a relatively constant range. Generally, a cuff pressure of 20-30 cmH2O is considered ideal, effectively preventing aspiration and damage to the tracheal mucosa. Unlike traditional pressure monitors, which cannot directly stabilize the pressure of cuffed devices in patients with inserted cuffs, this monitor requires re-preparation according to the established procedures. Utility Model Content

[0003] To address the shortcomings of existing airbag pressure monitoring devices, which are unable to handle patients with inserted airbags and provide rapid treatment for such patients, this utility model discloses a device for monitoring and maintaining the pressure of airbag devices.

[0004] A device for monitoring and maintaining the pressure of an airbag device, comprising: The air pump (1), the suction pump (2), the air pump solenoid valve switch (3), the suction pump solenoid valve switch (4), the airbag pressure control unit (5), and the airbag pressure acquisition unit (6) are connected to the pressure relief unit (5) through the air pump solenoid valve switch (3) and the suction pump solenoid valve switch (4), respectively. The airbag pressure acquisition unit (6) is connected to the pressure relief unit (5).

[0005] The airbag pressure control unit (5) has an embedded PID controller.

[0006] The airbag pressure acquisition unit (6) acquires pressure signals through a pressure sensor, and the pressure signals are amplified by a signal amplification circuit.

[0007] The signal amplification circuit includes a first operational amplifier, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor. The non-inverting input terminals of the first and second operational amplifiers are connected to a power supply. The non-inverting input terminal and output terminal of the first operational amplifier are respectively connected to the two ends of the first resistor. The non-inverting input terminal and output terminal of the second operational amplifier are respectively connected to the two ends of the second resistor. The two ends of the seventh resistor are respectively connected to the non-inverting input terminals of the first and second operational amplifiers. The two ends of the third resistor are respectively connected to the output terminal of the first operational amplifier and the non-inverting input terminal of the third operational amplifier. The two ends of the fourth resistor are respectively connected to the output terminal of the second operational amplifier and the non-inverting input terminal of the third operational amplifier. The non-inverting input terminal and output terminal of the third operational amplifier are respectively connected to the two ends of the sixth resistor. One end of the fifth resistor is connected to the non-inverting input terminal of the third operational amplifier, and the other end is grounded.

[0008] The resistance values ​​of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor are all the same.

[0009] The first and second operational amplifiers use dual-channel operational amplifier chips, with the chip model being GS8552, and the third operational amplifier uses a chip model of GS8552.

[0010] The voltage of the air pump (1) and the suction pump (2) is adjusted by a voltage regulating circuit.

[0011] The voltage regulation circuit includes a controller, an inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor. The first and second capacitors are connected in parallel between the controller's EN input terminal and GND input terminal, respectively. One end of the inductor is connected to the controller's third output terminal. The third, fourth, and fifth capacitors are connected in parallel between the other end of the inductor and the ground wire, respectively. The eighth resistor is connected in parallel between the controller's fifth output terminal and the ground wire, and the tenth resistor is connected in parallel between the other end of the inductor and the controller's fifth output terminal. One end of the ninth resistor is connected to the controller's fifth output terminal, and the other end of the ninth resistor is connected to the sixth and eleventh resistors. The other end of the sixth capacitor is grounded, and the other end of the eleventh resistor is connected to the CTRL control signal.

[0012] The controller is model TLV62569DBVR.

[0013] The device for monitoring and maintaining the pressure of the airbag device also includes an NTC temperature acquisition module.

[0014] This utility model, by adopting the above technical solution, has significant technical effects: This invention addresses patients with inserted airbags by collecting and recording the current pressure value from the pressure sensor. The instrument then automatically analyzes the patient's condition, simplifying preparation for such patients. The device offers a user-friendly interface and a reliable pressure stabilization algorithm, enabling patients to quickly enter the surgical state. Attached Figure Description

[0015] The following figures illustrate specific embodiments of this application: Figure 1 This is a schematic diagram of the overall structure of the device for monitoring and maintaining the pressure of an airbag device according to an embodiment of this utility model; Figure 2 This is a circuit diagram of the signal amplification circuit described in an embodiment of this utility model; Figure 3 This is a circuit diagram of the voltage regulation circuit described in the embodiment of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0017] Example 1: A device for monitoring and maintaining the pressure of an airbag device, such as Figure 1 As shown, it includes: The air pump (1), the suction pump (2), the air pump solenoid valve switch (3), the suction pump solenoid valve switch (4), the airbag pressure control unit (5), and the airbag pressure acquisition unit (6) are connected to the pressure relief unit (5) through the air pump solenoid valve switch (3) and the suction pump solenoid valve switch (4), respectively. The airbag pressure acquisition unit (6) is connected to the pressure relief unit (5).

[0018] Among them, the air pump (1) is used to increase the system air pressure when the air pressure is insufficient. The suction pump (2) is used to reduce the system volume and facilitate the operation of surgical balloon instruments. The air pump solenoid valve switch (3) is turned on when inflation is needed and turned off after reaching the threshold. The suction pump solenoid valve switch (4) is turned on when suction or deflation is needed. The air balloon pressure control unit (5) and the air balloon pressure acquisition unit (6) have high accuracy and realize low distortion acquisition, providing data for the device's self-regulation.

[0019] The airbag pressure control unit (5) has an embedded PID controller U1 to prevent the system pressure from rising too quickly and to prevent pressure oscillation. It calculates the data collected by the sensor module in real time and outputs the control signal promptly.

[0020] The airbag pressure acquisition unit (6) acquires pressure signals through a pressure sensor, and the pressure signals are amplified by a signal amplification circuit.

[0021] The signal amplification circuit, such as Figure 2 As shown, the system includes a first operational amplifier A1, a second operational amplifier A2, a third operational amplifier A3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. The non-inverting input terminals of the first operational amplifier A1 and the second operational amplifier A2 are connected to a power supply. The non-inverting input terminal and the output terminal of the first operational amplifier A1 are respectively connected to the two ends of the first resistor R1. The non-inverting input terminal and the output terminal of the second operational amplifier A2 are respectively connected to the two ends of the second resistor R2. The seventh resistor R7... The two ends of the first operational amplifier A1 and the second operational amplifier A2 are respectively connected to the negative input terminal. The two ends of the third resistor R3 are respectively connected to the output terminal of the first operational amplifier A1 and the negative input terminal of the third operational amplifier A3. The two ends of the fourth resistor R4 are respectively connected to the output terminal of the second operational amplifier A2 and the positive input terminal of the third operational amplifier A3. The negative input terminal and output terminal of the third operational amplifier A3 are respectively connected to the two ends of the sixth resistor R6. One end of the fifth resistor R5 is connected to the positive input terminal of the third operational amplifier A3, and the other end is grounded.

[0022] The resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are all the same. In this embodiment, R1=R2=R3=R4=R5=R6=10KΩ, and the accuracy is 0.1%, which can reduce the resistance value caused by the heat generated by the resistors themselves.

[0023] The formula for calculating the amplification factor of an amplifier circuit is: V O =(V in+ -V in- (20 / R7+1); The pressure sensor's internal data acquisition section uses a Wheatstone bridge, V in+ Connect the positive terminal of the Wheatstone bridge, V in- Connect to the negative terminal of the Wheatstone bridge. V O V represents the magnification factor. in+ V represents the non-inverting input voltage of the first operational amplifier A1. in- This represents the negative input voltage of the first operational amplifier A1. Adjusting the value of the seventh resistor R7 allows for adjustable amplification.

[0024] The first operational amplifier A1 and the second operational amplifier A2 are dual-channel operational amplifier chips, with the chip model being GS8552, and the third operational amplifier A3 is also a GS8552 chip.

[0025] The voltage and switching frequency of the air pump (1) and suction pump (2) are adjusted by a voltage regulating circuit. The algorithm adapts to various surgical environments, achieving rapid voltage stabilization and alarm indication. The pump power supply voltage regulation method is as follows: the output voltage of the power supply is controlled by controlling the duty cycle of the CTRL signal.

[0026] The voltage regulation circuit, such as Figure 3 As shown, it includes a controller U1, an inductor L1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The model of the controller U1 is TLV62569DBVR. Specifically, the first capacitor C1 and the second capacitor C2 are connected in parallel between the EN input terminal and the GND input terminal of the controller U1, respectively. One end of the inductor L1 is connected to the third output terminal of the controller U1. The third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are connected in parallel between the other end of the inductor L1 and the ground wire, respectively. The eighth resistor R8 is connected in parallel between the fifth output terminal of the controller U1 and the ground wire. The tenth resistor R10 is connected in parallel between the other end of the inductor L1 and the fifth output terminal of the controller U1. One end of the ninth resistor R9 is connected to the fifth output terminal of the controller U1. The other end of the ninth resistor R9 is connected to the sixth capacitor C6 and the eleventh resistor R11. The other end of the sixth capacitor C6 is grounded. The other end of the eleventh resistor R11 is connected to the CTRL control signal.

[0027] Because the practical environment may experience temperature variations, an NTC temperature acquisition module is added to the system. The system collects and records temperature change data, performs AD conversion on the air pressure data, and then adds temperature coefficient correction. This significantly improves the zero-point drift of the sensor, thereby enhancing the accuracy of the airbag pressure acquisition data.

[0028] This invention addresses patients with inserted airbags by collecting and recording the current pressure value from the pressure sensor. The instrument then automatically analyzes the patient's condition, simplifying preparation for such patients. The device offers a user-friendly interface and a reliable pressure stabilization algorithm, enabling patients to quickly enter the surgical state. Example 2

[0029] A method for controlling a device for monitoring and maintaining the pressure of an airbag device, comprising: The air pressure is recorded and analyzed by the airbag pressure acquisition unit (6), and the on / off switch and power of the inflation pump (1) and the inhalation pump (2) are automatically adjusted. With the help of the human-computer interaction operation of medical staff, the air pressure is stabilized under various conditions and automatically adjusted.

[0030] The pressure stabilization process can be maintained by using a PID algorithm to turn the inflation pump (1) and suction pump (2) on or off in advance, ensuring that the pressure inside the airbag is kept within the threshold.

[0031] S1. Monitoring: In this state, based on the relationship between the time to reach the threshold air pressure and the power, the motor power is adjusted through the pressure regulating circuit to adapt the power of the air pump (1) and the suction pump (2) to the current pipeline state. This ensures that the air pressure is maintained within the threshold range for a long time, thereby reducing the number of self-regulation cycles. It provides initial values ​​for the subsequent "recovery" process. It has functions for maintaining air pressure and high / low pressure alarms.

[0032] This stage is mainly for adjusting the motor power. By statistically analyzing the pressure value and the rate of pressure change, the duty cycle of the PWM signal is changed, thereby altering the motor power.

[0033] Initialize parameters: Initialize appropriate proportional term coefficients, integral term coefficients, and differential term coefficients by setting the thresholds; Real-time monitoring data: Control output air pressure, actual output voltage. Parameter adjustment: Determine whether adjustment is needed based on the magnitude and trend of the pressure error signal change.

[0034] If the change is within a certain range, then keep the parameters unchanged; If the parameters exceed the range, the step size and parameter values ​​can be adjusted appropriately. By monitoring the system's response characteristics, the overshoot can be calculated, and the timing adjusted accordingly. The new parameters should then be determined to meet the current system requirements.

[0035] The formula for calculating control pressure is: P k =(K p *E t +K i *P s +K d *(E t -E t-1 )) Among them, P K To control the output air pressure, Kp is the proportional term coefficient, Ki is the integral term coefficient, Kd is the differential term coefficient, and E... t E is the difference between the current control pressure and the actual pressure. t- This is the difference between the previous controlled air pressure and the actual air pressure.

[0036] Output control quantities for each component of the pressure control unit (5).

[0037] Execution and feedback: Receive control signals from the airbag pressure control unit (5) and control the switching quantities of each module.

[0038] S2, Recovery: Maintain stable air pressure and do not trigger alarms.

[0039] S3, Intubation Care: Displays the current air pressure, no operation is performed; the interval T is set by medical staff, if no operation is performed within time T, the status changes from "Intubation Care" to "Monitoring". S4. Removal of the tube: Turn on the air pump to create negative pressure, reducing the volume of the airbag-type device; making it easier to remove the airbag-type device. Parameter adjustment methods include: 1. Calculate the current error, record the error value at the previous moment, and obtain the rate of change of error; 2. Based on the magnitude and direction of the error rate of change, determine the system's response characteristics.

[0040] If the rate of change of error is large and its direction is opposite to the set value, it is determined that the system response is too fast, and K can be reduced. p Or add K i ,K d Reduce the response speed of the pressure system.

[0041] If the error rate is small and the direction is the same as the set value, it indicates that the system response is sluggish and K needs to be increased. p Or reduce K i and K d The value of improves the system's response speed.

[0042] If the error value remains close to the threshold range, it means that the parameters can be kept unchanged or fine-tuned to make the target pressure closer to the set pressure.

[0043] 3. If the system pressure remains below the threshold for an extended period, it indicates that the pump power is insufficient. You can appropriately increase the pump power and then repeat steps 1 and 2.

[0044] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for monitoring and maintaining the pressure of an airbag device, characterized in that, include: The air pump (1), the suction pump (2), the air pump solenoid valve switch (3), the suction pump solenoid valve switch (4), the airbag pressure control unit (5), and the airbag pressure acquisition unit (6) are connected to the pressure relief unit (5) through the air pump solenoid valve switch (3) and the suction pump solenoid valve switch (4), respectively. The airbag pressure acquisition unit (6) is connected to the pressure relief unit (5).

2. The device for monitoring and maintaining the pressure of an airbag device according to claim 1, characterized in that, The airbag pressure control unit (5) has an embedded PID controller.

3. The device for monitoring and maintaining the pressure of an airbag device according to claim 1, characterized in that, The airbag pressure acquisition unit (6) acquires pressure signals through a pressure sensor, and the pressure signals are amplified by a signal amplification circuit.

4. The device for monitoring and maintaining the pressure of an airbag device according to claim 1, characterized in that, The signal amplification circuit includes a first operational amplifier, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor. The non-inverting input terminals of the first and second operational amplifiers are connected to a power supply. The non-inverting input terminal and the output terminal of the first operational amplifier are respectively connected to the two ends of the first resistor. The non-inverting input terminal and the output terminal of the second operational amplifier are respectively connected to the two ends of the second resistor. The two ends of the seventh resistor are respectively connected to the non-inverting input terminals of the first and second operational amplifiers. The two ends of the third resistor are respectively connected to the output terminal of the first operational amplifier and the non-inverting input terminal of the third operational amplifier. The two ends of the fourth resistor are respectively connected to the output terminal of the second operational amplifier and the non-inverting input terminal of the third operational amplifier. The non-inverting input terminal and the output terminal of the third operational amplifier are respectively connected to the two ends of the sixth resistor. One end of the fifth resistor is connected to the non-inverting input terminal of the third operational amplifier, and the other end is grounded.

5. The device for monitoring and maintaining the pressure of an airbag device according to claim 4, characterized in that, The resistance values ​​of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor are all the same.

6. The device for monitoring and maintaining the pressure of an airbag device according to claim 4, characterized in that, The first and second operational amplifiers use dual-channel operational amplifier chips, with the chip model being GS8552, and the third operational amplifier uses a chip model of GS8552.

7. The device for monitoring and maintaining the pressure of an airbag device according to claim 1, characterized in that, The voltage of the air pump (1) and the suction pump (2) is adjusted by a voltage regulating circuit.

8. The device for monitoring and maintaining the pressure of an airbag device according to claim 7, characterized in that, The voltage regulation circuit includes a controller, an inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor. The first and second capacitors are connected in parallel between the controller's EN input terminal and GND input terminal, respectively. One end of the inductor is connected to the controller's third output terminal. The third, fourth, and fifth capacitors are connected in parallel between the other end of the inductor and the ground wire, respectively. The eighth resistor is connected in parallel between the controller's fifth output terminal and the ground wire, and the tenth resistor is connected in parallel between the other end of the inductor and the controller's fifth output terminal. One end of the ninth resistor is connected to the controller's fifth output terminal, and the other end of the ninth resistor is connected to the sixth and eleventh resistors. The other end of the sixth capacitor is grounded, and the other end of the eleventh resistor is connected to the CTRL control signal.

9. The device for monitoring and maintaining the pressure of an airbag device according to claim 8, characterized in that, The controller is model TLV62569DBVR.

10. The device for monitoring and maintaining the pressure of an airbag device according to claim 1, characterized in that, Also includes: NTC temperature acquisition module.

Images