CN216387798U

CN216387798U - Breathing machine controlled in dual modes

Info

Publication number: CN216387798U
Application number: CN202122692079.7U
Authority: CN
Inventors: 徐秀芳; 张曦予; 陈宜亮
Original assignee: Hebei Shangsheng Medical Technology Development Co ltd
Current assignee: Hebei Shangsheng Medical Technology Development Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-04-26
Anticipated expiration: 2031-11-05

Abstract

The utility model relates to a dual-mode control respirator, and belongs to the technical field of respirators. The hardware structure of the respirator is divided into a main board and an auxiliary board, wherein the main board mainly comprises a microcontroller, a human-computer interaction module, an alarm module and a sensor required by the respirator; the auxiliary board provides power for the whole breathing machine system, receives the instruction sent by the main board simultaneously, controls the driving of the fan and the heating of the humidifier, and mainly comprises a power circuit module, a fan driving circuit module and a humidifier control circuit module. The utility model designs the hardware part of the breathing machine, so that the stability and the reliability of the breathing machine are improved. The ventilator controls the fan through the microcontroller to realize pressure regulation, can meet the requirements of stable output of the fan to airway pressure in different ventilation modes, and ensures the ventilation pressure, tidal volume target and other requirements required by a patient.

Description

Breathing machine controlled in dual modes

Technical Field

The utility model relates to a dual-mode control respirator, and belongs to the technical field of respirators.

Background

In recent years, the incidence of various chronic respiratory diseases is rising year by year, the number of patients is increasing, the health of the patients is threatened, and the daily life of the patients is influenced to a certain extent. The ventilator can effectively treat diseases in the aspect of respiratory system, and the noninvasive ventilator is concerned by people by virtue of the advantages of simple operation, small wound to patients and the like, and goes into the daily life of more people.

Most of the existing ventilators are the most basic ventilation modes, the design of a control algorithm of pressure output is simpler, the man-machine synchronism is poor in the using process, and the comfort level of a patient is greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a dual-mode control respirator.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a dual-mode control respirator is characterized in that the hardware structure of the respirator is divided into a main board and an auxiliary board, wherein the main board mainly comprises a microcontroller, a human-computer interaction module, an alarm module and a sensor required by the respirator; the auxiliary board provides power for the whole breathing machine system, receives the instruction sent by the main board simultaneously, controls the driving of the fan and the heating of the humidifier, and mainly comprises a power circuit module, a fan driving circuit module and a humidifier control circuit module.

The technical scheme of the utility model is further improved as follows: the microcontroller on the caller board is MIMXRT1052CVL5B, and the running operating system is RT-Thread.

The technical scheme of the utility model is further improved as follows: the sensor comprises a flow sensor, a pressure sensor and a blood oxygen sensor.

The technical scheme of the utility model is further improved as follows: the mainboard also comprises a wireless communication module and a data storage module.

The technical scheme of the utility model is further improved as follows: the pressure sensor used by the pressure measurement circuit is ABPDANN010KG2D 3; the SCL port and the SDA port of the pressure sensor ABPDANN010KG2D3 are respectively connected with the LPI2C1_ SCL port and the LPI2C1_ SDA port of the microcontroller MIMXRT1052CVL 5B.

The technical scheme of the utility model is further improved as follows: the flow sensor used by the flow measurement circuit is SM 9541-010C-D-C-3-S; the SCL port and the SDA port of the flow sensor SM9541-010C-D-C-3-S are respectively connected with the LPI2C2_ SCL port and the LPI2C2_ SDA port of a microcontroller MIMXRT1052CVL 5B.

The technical scheme of the utility model is further improved as follows: the sensor used by the blood oxygen measuring circuit is LR-SP-A21, and the UART _ TX port and the UART _ RX port of the sensor LR-SP-A21 are respectively connected with the LPART 1_ RX port and the LPART 1_ TX port of the microcontroller MIMXRT1052CVL 5B; the sensor is composed of LR-SP-A21, and has RA-, RED-and RED-ports respectively connected with PD-, PD + -, LED + and LED-ports of the blood oxygen probe.

The technical scheme of the utility model is further improved as follows: the human-computer interaction module comprises a liquid crystal display screen; the liquid crystal display screen is a VGUS screen, and the DOUT port and the DIN port of the VGUS screen are respectively connected with the LPUART2_ RX port and the LPUART2_ TX port of the microcontroller MIMXRT1052CVL 5B.

The technical scheme of the utility model is further improved as follows: the device also comprises a key input module, an EC11 rotary encoder is used; and is connected with a GPIO3_ IO01 port, a GPIO3_ IO02 port and a GPIO3_ IO16 port of the microcontroller MIMXRT1052CVL 5B.

Due to the adoption of the technical scheme, the utility model has the following technical effects:

the utility model designs the hardware part of the breathing machine, so that the stability and the reliability of the breathing machine are improved.

The ventilator controls the fan through the microcontroller to realize pressure regulation, can meet the requirements of stable output of the fan to airway pressure in different ventilation modes, and ensures the ventilation pressure, tidal volume target and other requirements required by a patient.

The breathing machine carries out real-time supervision to running state and breathing parameter etc. in the use, if when going wrong, can trigger LED lamp and audio alert, also can show corresponding warning picture on the screen simultaneously, in time reminds the user, ensures the security in the user's use.

According to the utility model, the SD card is used for storing the respiratory data generated in the using process of the user, and the matched upper computer software can be used for reading the stored data and checking the treatment condition of the user. And wireless connection is established with the WeChat small program at the mobile phone end, so that important breathing parameters can be checked at the mobile phone end, and related settings of the breathing machine can be modified.

The utility model utilizes the carried liquid crystal display screen to display the operating parameters of the breathing machine during working in real time, including parameters such as tidal volume, oxyhemoglobin saturation, working pressure and the like, and simultaneously draws a real-time curve graph of pressure and flow in a graph area of the display screen, thereby being convenient for observing the use condition of a patient. The user can set the specific working mode and other functions of the breathing machine by inputting through the independent key and the rotary encoder.

Drawings

FIG. 1 is a diagram of the hardware design of a noninvasive ventilator of the present invention;

FIG. 2 is a circuit diagram of a noninvasive ventilator pressure measurement of the present invention;

FIG. 3 is a flow measurement circuit diagram of a noninvasive ventilator of the present invention;

FIG. 4 is a circuit diagram of a noninvasive ventilator blood oxygen measuring module of the present invention;

FIG. 5 is a circuit diagram of the noninvasive ventilator liquid crystal display and microcontroller communication circuit of the present invention;

FIG. 6 is a circuit diagram of the noninvasive ventilator key input module and microcontroller connection according to the present invention;

FIG. 7 is a design drawing of a sub-board of the noninvasive ventilator of the present invention;

FIG. 8 is a schematic circuit diagram of a wireless communication module of the noninvasive ventilator of the present invention;

FIG. 9 is a circuit schematic diagram of a noninvasive ventilator data storage module of the present invention;

fig. 10 is a circuit diagram of the intelligent alarm module of the noninvasive ventilator of the utility model.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention is a dual mode controlled ventilator, and the hardware configuration thereof will be described in detail below.

As shown in fig. 1, the hardware structure of the breathing machine is divided into a main board and a secondary board, wherein the main board mainly comprises a microcontroller, a man-machine interaction module, an alarm module and a sensor required by the breathing machine; the auxiliary board provides power for the whole breathing machine system, receives the instruction sent by the main board simultaneously, controls the driving of the fan and the heating of the humidifier, and mainly comprises a power circuit module, a fan driving circuit module and a humidifier control circuit module.

As shown in figure 1, the microcontroller on the main board of the utility model is MIMXRT1052CVL5B, and the operating system is RT-Thread, which is used as the control core of the whole breathing machine system, manages the scheduling of a plurality of tasks orderly and ensures the normal operation of the system. According to the setting of the operating parameters of the noninvasive ventilator, such as the working mode, the treatment pressure and the like, the microcontroller controls the brushless direct current motor by controlling the fan driving module on the auxiliary plate, and airflow generated by the rotation of the fan blades is used as an air source of the ventilator to realize noninvasive positive pressure ventilation. When gas passes through the throttling device in the system, a certain pressure difference value can be generated on two sides of the device, the pressure difference value can be measured by using the differential pressure type sensor, then the measurement of the gas flow value in the ventilation pipeline is realized according to the fitting relation of pressure and flow, and meanwhile, the gas pressure is detected by using the pressure sensor. The microcontroller controls the heating circuit of the humidifier, so that the effect of heating and humidifying gas can be realized, and discomfort of a patient in cold and dry winter can be relieved. The human-computer interaction module comprises a display screen and a key, the display screen is used for displaying a working interface, various setting interfaces and the like of the breathing machine, and meanwhile, a patient can use the key to conveniently and quickly operate the breathing machine.

The sensor comprises a flow sensor, a pressure sensor and a blood oxygen sensor, and the sensors are used for detecting and calculating parameters such as gas pressure, gas flow, human blood oxygen saturation and the like in a pipeline required in the operation process of the respirator.

Pressure sensor's model is ABPDANN010KG2D3, adopts 6 pin DIP encapsulation, and the range is OkPa ~ lOkPa, communicates through IIC mode and microcontroller, and the output data format is 14 digit quantity, has the unipolar hole of falling thorn simultaneously, conveniently connects the use, external 3.3V power supply. As shown in FIG. 2, the SCL port and the SDA port of the pressure sensor ABPDANN010KG2D3 are respectively connected with the LPI2C1_ SCL port and the LPI2C1_ SDA port of the microcontroller MIMXRT1052CVL 5B.

The flow sensor used by the flow measurement circuit is SM 9541-010C-D-C-3-S; the sensor is a differential pressure sensor, the interior of the sensor combines a unique MEMS pressure sensing technology with a signal conditioning special integrated circuit, and meanwhile, the sensor also has the functions of pressure calibration and temperature compensation, so that the sensor realizes the high-precision measurement effect in application, the communication is carried out through an IIC interface and a mainboard, the sensor has 14-bit high-resolution digital quantity output, the power supply of an external 3.3V power supply, the integration of a system and the installation of the sensor are easily realized through the design of double vertical ports, and a hose is directly used for connecting a sensor port and a flow measurement port in a throttling device during use. Specifically, the SCL port and the SDA port of the flow sensor SM9541-010C-D-C-3-S are respectively connected with the LPI2C2_ SCL port and the LPI2C2_ SDA port of a microcontroller MIMXRT1052CVL 5B. As shown in particular in figure 3.

The ventilator uses a fingerstall-type sensor probe to measure the blood oxygen saturation and pulse rate of the patient. The blood oxygen measuring module consists of a blood oxygen probe and a blood oxygen processing module, wherein the blood oxygen probe is matched with an LR-SP-A21 sensor, and the direct pins are correspondingly connected. The patient can on the finger probe cover when using, and the probe is inside to contain emitting diode, can send the infrared light of two kinds of wavelength, utilizes dual wavelength photoelectric detection method to convert light signal into the signal of telecommunication, conveys blood oxygen processing module, and blood oxygen processing module handles the signal of telecommunication that receives, and then obtains oxyhemoglobin saturation and pulse rate value, uploads the data packet to microcontroller through the serial ports mode at last. The sensor used by the oximetry circuit is LR-SP-A21. The UART _ TX port and the UART _ RX port of the sensor LR-SP-A21 are respectively connected with the LPUART1_ RX port and the LPUART1_ TX port of the microcontroller MIMXRT1052CVL 5B; the sensor is composed of LR-SP-A21, and has RA-, RED-and RED-ports respectively connected with PD-, PD + -, LED + and LED-ports of the blood oxygen probe. As shown in particular in fig. 4.

The human-computer interaction module comprises a liquid crystal display screen; the liquid crystal display screen is a VGUS screen. When the VGUS screen is used, firstly, addresses are pre-allocated to information such as icons, characters and Chinese characters required in engineering in configuration software, relevant setting is carried out on display effects, then a configuration engineering folder VT _ SET is generated, and the configuration engineering folder VT _ SET is downloaded to a Flash memory inside the display screen by using a U disk or a TF card. The method has the advantages that the display format and the variable content are designed separately, a user can complete the design of the picture display project through VGUS configuration software, when the liquid crystal display is used, the microcontroller is only required to send the related variable content through the serial port, and the format and the number of instructions are greatly simplified. As shown in fig. 5, specifically, the DOUT port and the DIN port of the VGUS screen are connected to the lpart 2_ RX port and the lpart 2_ TX port of the microcontroller MIMXRT1052CVL5B, respectively.

The present invention also includes a key input module that uses an EC11 rotary encoder. The EC11 rotary encoder used is an incremental rotary encoder with clockwise rotation, counterclockwise rotation, and key functions. The basic principle is that when the rotary encoder rotates, two-phase square wave signals are output, and the phase difference between the two signals is 90. The rotation direction of the encoder can be determined according to the lead-lag relationship of the two-phase square wave pulses, 20 pulse signals are output at each rotation of EC11, and the rotation angle of EC11 can be obtained by counting the pulse signals.

As shown in fig. 6, the ECU has 5 pins, the A, B pin outputs A, B two-phase square wave pulse, the C pin is a common terminal and is directly grounded, the D, E pin is a key portion of EC11, and when EC11 is pressed, the D, E pin is internally turned on. In order to eliminate the jitter interference of square wave pulses, an RC filter circuit and a Schmitt trigger inverter part are specially added. The GPIO3JO01 pin of the microcontroller is configured as an interrupt pin, edge triggering interrupt is carried out through the A-phase square wave pulse, and meanwhile, the GPIO3JO02 pin is configured as an input mode and used for detecting the level state of the B-phase square wave pulse, so that the rotation direction of the EC11 can be judged. When the rotary encoder is pressed, the GPIO3JO16 configured as an interrupt pin is subjected to level triggering, so that whether the encoder is pressed or not is judged. The ECU is connected with GPIO3_ IO01, GPIO3_ IO02 and GPIO3_ IO16 of a microcontroller MIMXRT1052CVL 5B.

The utility model also comprises a wireless communication module and a data storage module on the mainboard.

The data storage module comprises an EEPROM data storage chip and an SD card, wherein the EEPROM data storage chip is used for storing some initialization parameters when the respirator is started, and storing changed settings, abnormal breathing events and the like during the use process. The SD card is used for storing data such as respiratory related parameters of a patient in the process of using the noninvasive ventilator to treat, and medical personnel can read the data recorded in the SD card through matched upper computer management software, so that the service condition of the patient is analyzed, and a treatment scheme is adjusted in time. Two mechanical switches are arranged on a card slot of the SD card and respectively correspond to WP and INSERT pins, the WP pin level represents the write protection state of the SD card, the INSERT pins are used for detecting whether the SD card is correctly inserted into the matched card slot, and two I/O ports of the microcontroller are connected with the WP and INSERT pins and are used for detecting the states of the two pins, so that the write protection state of the SD card is identified and whether the SD card is inserted into the card slot is identified. As shown in particular in fig. 9.

BW16 is selected for use to the wireless communication module, and it is a highly integrated bluetooth low energy and two unification modules of WIFI, embeds TCP/IP protocol stack, can support 2.4GHz or 5GHz dual-frenquency WIFI and BLEV5.0 bluetooth. When the module works in a WIFI state, three working modes can be selected, namely a terminal is substantially in a STA mode, an AP mode and a STA + APo STA mode, and AP equipment needs to be connected so as to connect a wireless network; the module is used as a wireless access point in the AP mode, and other wireless devices can be accessed to the module for networking; when the module works in the STA + AP mode, the two modes can be switched with each other according to actual conditions. The subject is to use an STA mode in which a noninvasive ventilator and a mobile phone are connected to the same router and communicate with each other. The module also supports various communication interfaces, including UART interface, I2C interface and SPI interface, when using, the microcontroller communicates with the module through the serial port, carries out the relevant configuration such as mode selection to it through the supporting AT instruction of sending module, just can realize the conversion between user's serial port and the wireless network after entering the mode of passing through, carries out data transmission between breathing machine and cell-phone.

The circuit connection of the wireless communication module to the microcontroller is shown in fig. 8. The CHIP _ EN pin is a CHIP enable pin and is connected with a 3.3V power supply through a pull-up resistor. The BW16 module has two serial ports, one is AT serial port, is used for receiving AT order that the microcontroller sends and making the corresponding reply, the corresponding pin is AT _ RX and AT _ TX; the other is a LOG serial port which is mainly used for upgrading a firmware library and printing LOGs, and corresponding pins are LOG _ RX and LOG _ TX. In the utility model, only the AT serial port and the microcontroller are used for communication, and the LOG serial port is not used temporarily.

The intelligent alarm system provided by the utility model has the advantages that the intelligent alarm module can simultaneously send out sound and light alarm signals to the problems detected by the respirator system. The voice alarm adopts an intelligent voice module DY-SV17F, which comprises seven working modes, such as IO segment trigger, standard MP3 and UART serial port control, and the like, and is stored by onboard 4MB Flash, so that the required audio file can be automatically downloaded. The voice module is communicated with the microcontroller through a serial port, when the microcontroller detects an alarm problem, related instructions are sent to the voice module, and the module sends out corresponding voice alarm according to different instructions. When the breathing machine emits voice alarm, the system can control the LED lamp to carry out light alarm. DY-SV17F, wherein the TX port and the RX port of the DY-SV17F are respectively connected with the LPUART4_ RX port and the LPUART4_ TX port of the microcontroller MIMXRT1052CVL 5B; the SPK + port and the SPK-port are connected with a horn; an LED alarm lamp is connected with a GPIO _ O24 port of the microcontroller MIMXRT1052CVL 5B. The working mode of the voice module can be selected by configuring the high and low level states of the pins CON 1-CON 3, in the technical scheme, a UART mode is used, the mode needs to connect the pin CON3 with a 3.3V power supply through a pull-up resistor, and the pins CON1 and CON2 are connected with the ground through pull-down resistors. When the voice module works in a 10-trigger mode, pins IOO/TX and I01/RX correspond to pins 100 and 101, when the voice module works in a UART serial port mode, pins IOO/TX and I01/RX correspond to pins TX and RX, and RX pins SPK + and SPK-connected with the microcontroller are power amplifier output pins and are respectively connected with the anode and the cathode of a loudspeaker. One pin 10 of the microcontroller is connected with the LED, and the LED is controlled through the pin 10 to achieve the purpose of alarming. As shown in particular in fig. 10.

The auxiliary board of the control circuit mainly comprises three parts, namely a power supply module, a humidifier control circuit and a fan driving circuit. The power supply module mainly utilizes a voltage stabilizing chip to build a voltage stabilizing circuit, and converts an external power supply into required stable direct current voltage for a breathing machine system to use. The control circuit of the humidifier consists of a temperature detection circuit and a heating circuit, wherein the temperature detection takes a negative temperature coefficient thermistor as a detection element to measure the temperature of the humidifier, and the heating circuit controls the heating element to heat by controlling the on-off of the M0S tube. The method comprises the steps that a three-phase brushless direct current motor controller MLX90401 of Michelson corporation is selected in a fan driving circuit to drive and control a fan, the speed of the fan can be changed by changing a given voltage value of a speed adjusting input pin of the MLX90401, therefore, in the using process, a microcontroller outputs an adjustable PWM signal through a timer, the PWM signal is input to the speed adjusting input pin of a driver as given voltage for controlling the speed after two-stage RC filtering, and the given voltage is changed by the microcontroller through controlling the output PWM duty ratio according to a pressure value in a ventilation pipeline measured by a pressure sensor, so that the speed of the motor is adjusted and kept at the set pressure. As shown in particular in fig. 7.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A dual mode controlled ventilator characterized by: the hardware structure of the respirator is divided into a main board and an auxiliary board, wherein the main board mainly comprises a microcontroller, a human-computer interaction module, an alarm module and a sensor required by the respirator; the auxiliary board provides power for the whole breathing machine system, receives the instruction sent by the main board simultaneously, controls the driving of the fan and the heating of the humidifier, and mainly comprises a power circuit module, a fan driving circuit module and a humidifier control circuit module.

2. A dual mode controlled ventilator as set forth in claim 1 in which: the microcontroller on the caller board is MIMXRT1052CVL5B, and the running operating system is RT-Thread.

3. A dual mode controlled ventilator as set forth in claim 2 in which: the sensor comprises a flow sensor, a pressure sensor and a blood oxygen sensor.

4. A dual mode controlled ventilator as set forth in claim 3 in which: the mainboard also comprises a wireless communication module and a data storage module.

5. A dual mode controlled ventilator as set forth in claim 4 in which: the pressure sensor used by the pressure measurement circuit is ABPDANN010KG2D 3; the SCL port and the SDA port of the pressure sensor ABPDANN010KG2D3 are respectively connected with the LPI2C1_ SCL port and the LPI2C1_ SDA port of the microcontroller MIMXRT1052CVL 5B.

6. A dual mode controlled ventilator as set forth in claim 4 in which: the flow sensor used by the flow measurement circuit is SM 9541-010C-D-C-3-S; the SCL port and the SDA port of the flow sensor SM9541-010C-D-C-3-S are respectively connected with the LPI2C2_ SCL port and the LPI2C2_ SDA port of a microcontroller MIMXRT1052CVL 5B.

7. A dual mode controlled ventilator as set forth in claim 4 in which: the sensor used by the blood oxygen measuring circuit is LR-SP-A21, and the UART _ TX port and the UART _ RX port of the sensor LR-SP-A21 are respectively connected with the LPART 1_ RX port and the LPART 1_ TX port of the microcontroller MIMXRT1052CVL 5B; the sensor is composed of LR-SP-A21, and has RA-, RED-and RED-ports respectively connected with PD-, PD + -, LED + and LED-ports of the blood oxygen probe.

8. A dual mode controlled ventilator as set forth in claim 4 in which: the human-computer interaction module comprises a liquid crystal display screen; the liquid crystal display screen is a VGUS screen, and the DOUT port and the DIN port of the VGUS screen are respectively connected with the LPUART2_ RX port and the LPUART2_ TX port of the microcontroller MIMXRT1052CVL 5B.

9. A dual mode controlled ventilator as set forth in claim 4 in which: the device also comprises a key input module, an EC11 rotary encoder is used; is connected with a GPIO3_ IO01 port, a GPIO3_ IO02 port and a GPIO3_ IO16 port of the microcontroller MIMXRT1052CVL 5B; the alarm module uses DY-SV17F, and the TX port and the RX port of the alarm module are respectively connected with the LPUART4_ RX port and the LPUART4_ TX port of the microcontroller MIMXRT1052CVL 5B.

10. A dual mode controlled ventilator as set forth in claim 4 in which: the auxiliary board of the control circuit mainly comprises three parts, namely a power supply module, a humidifier control circuit and a fan driving circuit; the power supply module mainly utilizes a voltage stabilizing chip to build a voltage stabilizing circuit, and converts an external power supply into required stable direct-current voltage for a breathing machine system to use; the humidifier control circuit consists of a temperature detection circuit and a heating circuit, wherein the temperature detection takes a negative temperature coefficient thermistor as a detection element to measure the temperature of the humidifier; the heating circuit controls the heating element to heat by controlling the on-off of the M0S pipe; and a three-phase brushless direct current motor controller MLX90401 is selected from the fan driving circuit to drive and control the fan.