CN213406028U - Wearable wireless continuous reflection type oxyhemoglobin saturation monitoring device - Google Patents

Abstract

The utility model discloses a wearable wireless continuous reflection type oxyhemoglobin saturation monitoring device, which comprises a central processing unit; and: the pulse blood oxygen simulation device comprises a pulse blood oxygen simulation front end connected with an SPI (serial peripheral interface), a display circuit connected with an I2C interface, an alarm circuit connected with a GPI/O interface, a storage circuit connected with an I/O interface, a nine-shaft motion sensing sensor connected with an I2C interface, and a wireless communication circuit connected with a UART (universal asynchronous receiver/transmitter) serial port; and a blood oxygen saturation signal acquisition module connected with the pulse blood oxygen simulation front end; and the power supply circuit is used for providing a power supply for the wearable wireless continuous reflection type blood oxygen saturation monitoring device. The wearable wireless continuous reflective blood oxygen saturation monitoring device further comprises an upper computer and a client side, wherein the upper computer and the client side are communicated and interacted with the wireless communication circuit. The utility model discloses can realize the oxyhemoglobin saturation signal of long-range guardianship target, can guarantee to guardianship and export continuous, stable, the oxyhemoglobin saturation signal data of high accuracy all the time.

Description

Wearable wireless continuous reflection type oxyhemoglobin saturation monitoring device

Technical Field

The utility model belongs to the technical field of oxyhemoglobin saturation monitoring, a oxyhemoglobin saturation monitoring devices is related to, specifically a portable wireless continuous reflection formula oxyhemoglobin saturation monitoring devices.

Background

The blood oxygen saturation reflects the oxygen content of blood and is one of the important physical sign parameters of human body. The human blood reduces hemoglobin (Hb) and oxygen taken from alveoli to combine and become oxygenated hemoglobin (HbO2) which enters tissues to maintain the metabolism of tissue cells. The blood oxygen saturation refers to the percentage of oxygen (oxygen content) actually bound in the blood (hemoglobin) to the maximum amount of oxygen (oxygen capacity) that can be bound in the blood (hemoglobin). The blood oxygen saturation can be expressed as: SpO2 ═ CHbO2/(CHbO2+ CHb) SpO2 ═ CHbO2/(CHbO2+ CHb). The blood oxygen saturation index of a normal person in actual detection is usually 98-99%.

The measurement is generally classified into blood gas analysis and photoelectric measurement. The blood-gas analysis method is used for collecting arterial blood of a human body and carrying out electrochemical analysis by using a blood-gas analyzer. The blood gas analyzer is generally high in measurement precision and suitable for occasions needing accurate blood oxygen saturation data, such as deep hypothermia stop cycle surgery and the like. Blood gas analysis methods are expensive, take long time for analysis, create blood samples, and do not provide continuous, real-time data. The photoelectric measurement method is a continuous non-invasive blood oxygen measurement method, measures the oxygen content of the artery according to the difference of different light transmittances of the oxygen saturation of the artery, realizes the non-invasive, continuous and dynamic monitoring of the oxygen saturation, and has low cost. Photoelectric measurement is divided into two types, transmissive and reflective. The light emitting diode and the photosensitive diode or the triode of the transmission oximeter sensor are positioned at two sides of the measuring object, and the light emitting diode and the photosensitive diode or the triode of the sensor of the reflection oximeter are positioned at the same side of the measuring object. The transmission type is mainly used for measuring the blood oxygen of adult fingertips, has been widely applied to clinical and home monitoring, but is limited by the measuring depth and position, such as human brain blood oxygen detection and fetal blood oxygen detection. The reflective sensor is used without limitation of the placement of the sensor and is also capable of measuring the oxygenation status of muscle oxygen and any tissue. However, after the optical signal is reflected, the signal is weaker than that after the optical signal is refracted, and the requirements for denoising and amplifying the signal are stricter.

Sensitivity, size and cruising ability of the SpO2 sensor are related to measurement accuracy, sensitivity and product portability. The SpO2 is composed of 2 leds capable of emitting light of a specific wavelength and 1 photodiode or transistor for receiving light. The 2 light emitting diodes can respectively emit fixed 660nm (650nm) red light and 940nm (910nm) infrared light. Typically, the led is connected in parallel to the same side of the SpO2 sensor, with the photodiode/transistor being placed on the same or the other side. For a certain wavelength of light emitting tube, the arrangement mode includes three connection modes of single tube type, double tube type and double tube parallel type. For light emitting tubes with different wavelengths, the arrangement mode is divided into three modes of common-anode connection, common-cathode connection and yin-yang end-to-end connection according to different driving modes of internal current driving circuits. Because two light-emitting diodes and a photosensitive receiving tube are adopted to realize the measurement of the blood oxygen saturation degree by a double-beam measurement method, the light-emitting diodes adopt a pulse layer driving mode, and response signals of two light sources are completely distinguished by a synchronous pulse switch behind the photosensitive receiving device, thereby avoiding mutual crosstalk. The photosensitive receiving device converts received incident light signals into electric signals and is characterized by large receiving area, high sensitivity, small dark current and low noise. The blood oxygen sensor is divided into a finger type, an earlobe type, a wrapping type and an adhesion type according to the appearance. Incident light is received after being reflected after passing through tissues such as skin, bones, muscles and the like, and venous blood and arterial blood, wherein the absorption of the tissues such as skin, bones, muscles and the like, and non-pulsating components of the venous blood and the arterial blood to the light is regarded as constant, a direct current component (DC) of the reflected light is formed, and the absorption amount of the blood to the light changes when the arterial blood pulsates, and an alternating current component (AC) is formed. The dc component is noise and needs to be filtered out. Oxyhemoglobin (HbO2) absorbs less 660nm red light and more 940nm infrared light; the converse is true for hemoglobin (Hb). The amount of HbO2/Hb in the arterial blood flow increases, a decrease in red light absorbance occurs, and the absorbance of infrared light increases. The light waves are collected by the photosensitive diode/triode and converted into electric signals. And a circuit is used for distinguishing the blood signal of the artery fluctuation and the reference direct current signal.

The blood oxygen saturation signal is transmitted to the blood oxygen measuring module through a signal transmission line, and according to the Lambert-Beer law and the definition of the blood oxygen saturation, a linear empirical formula of the blood oxygen saturation can be deduced: sa02 is a + BR, with a and B being empirical constants. Wherein the content of the first and second substances,

AC (660) and AC (940) are the AC components of the two reflected light signals, and DC (660) and DC (940) are the DC components of the two reflected light signals.

The extraction of the pulse signal is a prerequisite for accurate calculation of the blood oxygen saturation. The pulse signal has the following characteristics: weak signal and strong interference. The pulse signals collected by the sensors are typically in the range of microvolts to millivolts. The main energy of the human pulse signal is distributed at 0.5-5 Hz. The variability of pulse signal analysis and processing is further increased by the fact that different pulse conditions may be present in different individuals of the same disease, and different pulse conditions may be present in different periods of the same disease in the same individual.

The interference signals for wirelessly and continuously monitoring the blood oxygen saturation mainly comprise ambient light, dark current, baseline drift, power frequency interference, motion artifact, sensor contact noise and the like. The system adopts a modulated light technology, and the influence of ambient light and dark current is reduced. In addition, after the blood oxygen signal is processed by a filter at the pulse blood oxygen simulation front end, most high-frequency noise is filtered, and power frequency interference is well inhibited. However, because of low-frequency motion noise generated by respiration and body movement of a patient, electromyographic interference in the same frequency band with blood oxygen signals, and power frequency interference which cannot be completely filtered in some cases, a digital filtering algorithm which is reasonable in design needs to be designed in a central processing unit or an upper computer.

In addition, in continuous monitoring, human body movement usually occurs, and venous pulsation is a main cause of movement disturbance when movement between the parts to be measured is studied and examined. There is strong motion interference, so it is necessary to process the motion interference and process the corresponding interference signal to obtain a more accurate value. The effect of motion disturbance is mainly on the variation of the ac signal.

The Perfusion Index (PI) reflects the Perfusion capacity of blood flow. The larger the pulsating blood flow, the more the pulsation component, and the larger the alternating current component in the pulse signal, the larger the PI value. PI values are affected by the site of measurement (skin, nail, bone, etc.), blood perfusion, hypothermia, hypoxemia, anesthesia, neuromodulation system, mental state. In pulse oximeters, the blood Perfusion Index (PI) is characterized by the ratio of the alternating current component to the direct current component of the PPG signal. The blood perfusion index of normal human body is above 3%. The perfusion index of low blood flow is weak in pulsation, alternating current components of pulse signals output by the blood oxygen probe are attenuated, useful signals are submerged in circuit noise and environmental noise, and characteristic points of the pulse waves are difficult to identify, so that parameter calculation errors such as blood oxygen saturation and the like are caused. Therefore, a new algorithm must be designed on the upper computer, the characteristic points of the alternating current component in the pulse wave signal are accurately searched, the value of the alternating current component is obtained, and parameters such as the blood perfusion volume, the pulse and the blood oxygen saturation are correctly calculated.

An object of the utility model is to provide a paste and apply in wireless continuous reflection formula oxyhemoglobin saturation monitoring device on wrist skin surface, convenient carries out test more accurately to patient oxyhemoglobin saturation to resist motion interference and low filling influence, simplified oxyhemoglobin saturation's monitoring procedure, compare in general oxyhemoglobin saturation monitoring device and improved the monitoring precision, and can remote transmission, realize alarming function.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model can be realized by the following technical scheme:

a wearable wireless continuous reflection type oxyhemoglobin saturation monitoring device comprises a central processing unit; and: the pulse blood oxygen simulation device comprises a pulse blood oxygen simulation front end connected with an SPI (serial peripheral interface), a display circuit connected with an I2C interface, an alarm circuit connected with a GPI/O interface, a storage circuit connected with an I/O interface, a nine-shaft motion sensing sensor connected with an I2C interface, and a wireless communication circuit connected with a UART (universal asynchronous receiver/transmitter) serial port; and a blood oxygen saturation signal acquisition module connected with the pulse blood oxygen simulation front end; and the power supply circuit is used for providing a power supply for the wearable wireless continuous reflection type blood oxygen saturation monitoring device.

Further, the wearable wireless continuous reflective blood oxygen saturation monitoring device further comprises an upper computer or a client end which is communicated and interacted with the wireless communication circuit.

Further, the display circuit is connected with the central processing unit PB10, PB 11; the alarm circuit is connected with a PB9 of the central processing unit; the storage circuit is connected with PB3, PB4, PB5, PB6, PB7 and PB8 of the central processing unit; the wireless communication circuit is connected with the PAs 9 and 10 of the central processing unit; the power supply circuit is connected with the PA11 and PA12 of the central processing unit; the nine-axis motion sensing sensors are connected to the central processor's PA0 and PA 1.

Further, the blood oxygen saturation signal acquisition module comprises a reflection type photoelectric sensor circuit, 1 red light diode D1, 1 infrared light diode D2 and 1 phototriode D3; the D3 receives the light reflected by the detection parts of the D1 and the D2, converts the light into a voltage signal, and sends the voltage signal to the pulse blood oxygen simulation front end after passing through the reflection type photoelectric sensor circuit. Preferably, the reflective photosensor circuit is of type NJL 5501R.

Further, the pulse oximetry analog front end comprises a transmitting part Tx, a receiving part Rx and a time schedule controller, wherein the transmitting part Tx comprises an LED driver and an LED current controller, the receiving part Rx comprises an I-V converter, an amplifier, a filter and an ADC, and the receiving part Rx is connected to an SPI interface of the central processing unit after receiving the signals collected by the oximetry signal collecting module; the time sequence controller controls the LED current control and the LED drive control to enable the luminous LEDs in the reflective photoelectric sensor circuit to work alternately according to a certain time sequence. Preferably, the LED driver is an H-bridge driver; the pulse blood oxygen simulation front end is selected as AFE 4400.

Further, the nine-axis motion sensing sensor adopts an MPU9250 chip.

Further, the display circuit comprises an OLED liquid crystal screen.

Further, the alarm circuit comprises a buzzer, and when the blood oxygen saturation degree is lower than a set threshold value, an alarm is given.

Further, the storage circuit is an SD memory card.

Further, the central processing unit processes signals transmitted by the pulse blood oxygen simulation front end through the SPI interface, calculates blood oxygen values, sends the blood oxygen values to a display to display measurement results, uploads the measurement results to a client through a wireless communication circuit, and displays the measurement results on the client; or sending to an upper computer to display the blood oxygen saturation and the pulse; the SD card is used for realizing the storage and calling of the signal data of the blood oxygen saturation degree of the human body measured each time; the RTC clock provides current time information for system work, and is convenient for the oxyhemoglobin saturation monitoring device to test, analyze and upload oxyhemoglobin saturation data of a patient at regular time; the receiving end of the wireless circuit is integrated with the nodes of the Zigbee network through the UART serial port and finally sent to the client and the upper computer. Preferably, the central processing unit adopts an STM32F103C8T6 chip.

Furthermore, the wireless communication circuit comprises a receiving part and a sending part, the wireless communication circuit transmits the digital blood oxygen saturation data in the central processing unit to the client or the upper computer through the sending part, receives the instruction of the client or the upper computer through the receiving part, and then transmits the instruction to the central processing unit through the USRT serial port. Preferably, the wireless communication circuit is of a type CC 2530.

Further, the output voltage of the power supply circuit is in a voltage range of 1.2V to 5.0V, and the preferred model is SGM2019-3.3YN 5G.

Furthermore, the client or the upper computer receives the oxyhemoglobin saturation data information through the wireless communication circuit, displays and stores the oxyhemoglobin saturation value and the waveform, and meanwhile, the oxyhemoglobin saturation alarm threshold value can be set through the wireless communication circuit.

The utility model has the advantages that: the utility model provides a long-range oxyhemoglobin saturation guardianship terminal of wearable that wrist skin surface is applied in subsides compares prior art, the utility model discloses can realize the oxyhemoglobin saturation signal of long-range guardianship target, through the function that realizes oxyhemoglobin saturation data information's receipt, waveform and numerical value display, storage and alert value setting with host computer or customer end communication. Under the emergency condition, continuous, stable and high-precision oxyhemoglobin saturation signal data can be ensured to be output all the time by monitoring, and the instantaneity, stability, portability and low power consumption of the wearable oxyhemoglobin saturation monitoring terminal are improved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic view of the overall structure design of the present invention.

Fig. 2 is a schematic diagram of reflective photosensor circuit connection.

FIG. 3 is a schematic diagram of the pulse oximetry analog front end circuit.

FIG. 4 is a schematic diagram of a nine-axis motion sensing sensor circuit connection.

Fig. 5 is a minimum circuit diagram of the cpu.

Fig. 6 is a schematic diagram of wireless communication circuit connections.

FIG. 7 is a schematic diagram of memory circuit connections.

Fig. 8 is a power supply circuit connection diagram.

FIG. 9 is a schematic diagram of an alarm circuit connection.

FIG. 10 is a schematic diagram showing circuit connections.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

A wearable wireless continuous reflective blood oxygen saturation monitoring device, as shown in fig. 1, comprising a central processing unit; and: the pulse blood oxygen simulation device comprises a pulse blood oxygen simulation front end connected with an SPI (serial peripheral interface), a display circuit connected with an I2C interface, an alarm circuit connected with a GPI/O interface, a storage circuit connected with an I/O interface, a nine-shaft motion sensing sensor connected with an I2C interface, and a wireless communication circuit connected with a UART (universal asynchronous receiver/transmitter) serial port; and a blood oxygen saturation signal acquisition module connected with the pulse blood oxygen simulation front end; and the power supply circuit is used for providing a power supply for the wearable wireless continuous reflection type blood oxygen saturation monitoring device. Furthermore, for the convenience of display and control, the wearable wireless continuous reflective blood oxygen saturation monitoring device further comprises an upper computer or a client which is communicated and interacted with the wireless communication circuit.

The display circuit is connected with the PB10 and PB11 of the central processing unit; the alarm circuit is connected with a PB9 of the central processing unit; the storage circuit is connected with PB3, PB4, PB5, PB6, PB7 and PB8 of the central processing unit; the wireless communication circuit is connected with the PAs 9 and 10 of the central processing unit; the power supply circuit is connected with the PA11 and PA12 of the central processing unit; the nine-axis motion sensing sensors are connected to the central processor's PA0 and PA 1.

The blood oxygen saturation signal acquisition module comprises a reflection type photoelectric sensor circuit, 1 red light diode D1, 1 red light diode D2 and 1 phototriode D3; the D3 receives the light reflected by the detection parts of the D1 and the D2, converts the light into a voltage signal, and sends the voltage signal to the pulse blood oxygen simulation front end after passing through the reflection type photoelectric sensor circuit. The blood oxygen saturation signal acquisition module is attached to the surface of a fingertip to detect and acquire absorption of oxyhemoglobin and hemoglobin on 660nm red light emitted by a red light diode D1 and 940nm infrared light emitted by a red light diode D2, and a phototriode D3 collects light waves and converts the light waves into electric signals. Preferably, the reflective photosensor circuit employs a NJL5501R chip, as shown in fig. 2. NJL5501R luminous wavelength, 660nm +/-3 nm (red light), 940nm +/-10 nm (infrared light), output current: 1.0mA-4.3mA (red light), 145 muA-580 muA (infrared light). COB packages (1.9mm by 2.6mm by 0.8mm), lead-free, halide-free, corresponding to the RoHS specification. The electric signal is transmitted to the pulse blood oxygen simulation front end through the receiving channel.

The pulse blood oxygen analog front end selects an AFE4490 chip, as shown in FIG. 3, integrates an I-V converter, an amplifier, a filter and an ADC, and processes signals to emit light, and transmits the light to the CPU through the SPI interface. The light-emitting diode H-bridge driver adopts a light modulation and demodulation method, the frequency of a pulse signal for controlling the light-emitting of the diodes by two light-emitting diodes is selected to be 1kHz, and the time sequence of the light-emitting state is red light, non-light-emitting, infrared light and non-light-emitting. The internal operating clock is 4MHz and the duty cycle time is set by an internal 16 bit counter. Each duty cycle is divided into four phases, with the sampling time set by an internal register. The system working current is 100uA + average LED current; the receiving channel completes the current-to-voltage conversion of the photodiode through a differential trans-impedance amplifier, and is provided with a 22-bit analog-to-digital converter. The signal enters the ADC for conversion through the Dl channel if the red LED is on, and otherwise enters the ADC through the D2 channel, as determined by the current LED. When the power supply voltage is 3.3V, the low power consumption of 670 muA is achieved, the LED driving current is 55 muA, and the transmission control current is 15 muA. The system has a self-test function, and adopts QFN-40 package with 6 multiplied by 6 mm.

The nine-axis motion sensing sensor is preferably an MPU9250 chip, the circuit of which is shown in FIG. 4. The MPU9250 employs a QFN 3 × 3 × 1mm package. Consists of 2 parts. One set is a 3-axis acceleration and 3-axis gyroscope, and the other set is an AK 89633 axis magnetometer. The I2C scheme directly outputs all data for the 9-axis. With three 16-bit acceleration AD outputs, three 16-bit gyroscope AD outputs, and three 6-bit magnetometer AD outputs, precise slow and fast motion tracking is provided. The device provides an interface of I2C and SPI, a supply voltage of 2.4-3.6V, and a separate digital IO port, and supports 1.71V to VDD. The communication uses I2C at 400KHz and SPI at 1MHz, and RDDLER at 20MHz can be used if faster speed is required. In RIDLER mode, the sensors and interrupt registers are read directly.

The central processing unit is selected as STM32F103C8T6, and is a microcontroller based on an ARM Cortex-M3 kernel, and a minimum system is shown in FIG. 5. The main working frequency is 72Hz, and the processing speed is enough to complete the digital processing algorithm of the blood oxygen signal. Rich I/O ports and peripherals connected to two APB buses, an embedded 2-way 12-bit analog/digital converter (ADC), 3 general 16-bit timers and 1 PWM timer. 2I 2C interfaces and SPI interfaces, 3 USART interfaces. In this system, the sampling frequency of the ADC is taken to be 100 Hz. The minimum system circuit comprises a power supply filter circuit, a crystal oscillator circuit, an indicator light, a reset circuit and a BOOT selection and expansion interface circuit. MCU calculates blood oxygen saturation of collected pulse data

The wireless communication circuit is in bidirectional communication with the oxyhemoglobin saturation acquisition client and the upper computer in a wireless mode. A CC2530 chip is adopted, the core is a wireless transceiver, an enhanced 8051 kernel singlechip embedded with a Zigbee protocol is used, and the circuit is shown in fig. 6. And the I/O interface is connected with the central processing unit. The data transmission rate is supported to be as high as 250kbps, and the multipoint-to-multipoint fast networking is realized. The embedded operating system is developed on an application layer of a protocol stack, the programmable output power is 4.5dBm, 5 modes are available for low power consumption, and different low power consumption modes can be selected under different environments. A 12-bit ADC with 5-channel DMA, 8-way input and configurable, etc. The signal that can be in real time with the oxyhemoglobin saturation monitoring devices collection is uploaded to customer end, host computer for the real-time demonstration and the processing of signal receive the instruction of customer end and host computer simultaneously. QFN package (6 mm × 6 mm) is adopted.

The storage circuit is used for storing and calling human electrocardiosignal data and is realized by an SD card. The circuit is shown in fig. 7.

The power circuit adopts SGM2019-3.3YN5G as shown in FIG. 8. Low output noise, low dropout, temperature load protection, output current limitation, high power supply rejection ratio (74 dB at the frequency of 1 kHz), 10nA logic control shutdown, multiple output voltages, fixed output of 1.2V, 1.5V, 1.8V, 2.5V, 2.6V, 2.8V, 2.85V, 3.0V and 3.3V. The output is regulated to be 1.2V to 5.0V, and the rapid and stable dynamic performance and low power consumption are realized. SC70-5 and SOT-23-5.

The alarm circuit alarms when the blood oxygen concentration is larger than or equal to a set value, otherwise, the alarm circuit continues to time and waits for the next measurement. Most preferably, an electromagnetic 5V active buzzer, an SOT plastic-sealed tube and a long-time sound are selected. The circuit is shown in fig. 9.

The display circuit displays the blood oxygen saturation value measured each time, and preferably, a 0.96-inch OLED display screen is selected in consideration of portability and size. The circuit is shown in fig. 10.

The utility model has the advantages that: the utility model provides a long-range oxyhemoglobin saturation monitor terminal of wearable compares prior art, the utility model discloses can realize the oxyhemoglobin saturation signal of long-range guardianship target, through the function that realizes receiving, waveform and numerical value display, storage and the warning value setting of oxyhemoglobin saturation data information with host computer or customer end communication. The wearable blood oxygen saturation monitoring terminal has the advantages that the alarm prompt is carried out under the emergency situation, and the real-time performance, the stability and the portability of the wearable blood oxygen saturation monitoring terminal are improved.

Claims (14)

1. A wearable wireless continuous reflection type oxyhemoglobin saturation monitoring device is characterized by comprising a central processing unit; and: the pulse blood oxygen simulation device comprises a pulse blood oxygen simulation front end connected with an SPI (serial peripheral interface), a display circuit connected with an I2C interface, an alarm circuit connected with a GPI/O interface, a storage circuit connected with an I/O interface, a nine-shaft motion sensing sensor connected with an I2C interface, and a wireless communication circuit connected with a UART (universal asynchronous receiver/transmitter) serial port; and a blood oxygen saturation signal acquisition module connected with the pulse blood oxygen simulation front end; and the power supply circuit is used for providing a power supply for the wearable wireless continuous reflection type blood oxygen saturation monitoring device.

2. The wearable wireless continuous reflective oximetry device of claim 1, further comprising an upper computer or client in communication and interaction with the wireless communication circuitry.

3. The wearable wireless continuous reflex oximetry monitoring device according to claim 1, wherein the display circuitry is connected to the central processor via PB10, PB 11; the alarm circuit is connected with a PB9 of the central processing unit; the storage circuit is connected with PB3, PB4, PB5, PB6, PB7 and PB8 of the central processing unit; the wireless communication circuit is connected with the PAs 9 and 10 of the central processing unit; the power supply circuit is connected with the PA11 and PA12 of the central processing unit; the nine-axis motion sensing sensors are connected to the central processor's PA0 and PA 1.

4. The wearable wireless continuous reflective oximetry device of claim 1, wherein the oximetry signal acquisition module comprises a reflective photosensor circuit, 1 red photodiode D1, 1 infrared photodiode D2, and 1 phototransistor D3; the D3 receives the light reflected by the detection parts of the D1 and the D2, converts the light into a voltage signal, and sends the voltage signal to the pulse blood oxygen simulation front end after passing through the reflection type photoelectric sensor circuit.

5. The wearable wireless continuous reflective oximetry monitoring device according to claim 1, wherein the pulse oximetry analog front end includes a transmitting portion Tx, a receiving portion Rx and a timing controller, wherein the transmitting portion Tx includes an LED driver and an LED current controller, the receiving portion Rx includes an I-V converter, an amplifier, a filter and an ADC, and the receiving portion Rx is connected to the SPI interface of the central processor after receiving the signals collected by the oximetry signal collection module; the time sequence controller controls the LED current control and the LED drive control to enable the luminous LEDs in the reflective photoelectric sensor circuit to work alternately according to a certain time sequence.

6. The wearable wireless continuous reflective blood oxygen saturation monitoring device according to claim 1, wherein the central processor processes the signals transmitted by the pulse oximetry analog front end through the SPI interface, calculates the blood oxygen value and sends the blood oxygen value to the display to display the measurement result, and the measurement result is uploaded to the client through the wireless communication circuit and displayed at the client; or sending to an upper computer to display the blood oxygen saturation and the pulse; the SD card is used for realizing the storage and calling of the signal data of the blood oxygen saturation degree of the human body measured each time; the RTC clock provides current time information for system work, and is convenient for the oxyhemoglobin saturation monitoring device to test, analyze and upload oxyhemoglobin saturation data of a patient at regular time; the receiving end of the wireless circuit is integrated with the nodes of the Zigbee network through the UART serial port and finally sent to the client and the upper computer.

7. The wearable wireless continuous reflective oximetry device according to claim 2, wherein the wireless communication circuit comprises a receiving part and a sending part, the wireless communication circuit transmits the digital oximetry data in the central processing unit to the client or the upper computer through the sending part, receives the instruction of the client or the upper computer through the receiving part, and transmits the instruction to the central processing unit through the USRT serial port.

8. The wearable wireless continuous reflective blood oxygen saturation monitoring device according to claim 2, wherein the client or the upper computer receives blood oxygen saturation data information through the wireless communication circuit, displays and stores blood oxygen saturation value and waveform, and sets blood oxygen saturation alarm threshold through the wireless communication circuit.

9. The wearable wireless continuous reflective blood oxygen saturation monitoring device according to any one of claims 1 to 8, characterized in that the reflective photosensor circuit employs NJL5501R chips.

10. The wearable wireless continuous reflection oximetry device according to any one of claims 1-8, wherein the pulse oximetry analog front end is of type AFE 4400.

11. The wearable wireless continuous reflection oximetry device according to any one of claims 1-8, wherein the nine-axis motion sensing sensor employs an MPU9250 chip.

12. The wearable wireless continuous reflex oximetry device according to any one of claims 1 to 8, wherein the central processor employs an STM32F103C8T6 chip.

13. The wearable wireless continuous reflex oximetry device of any one of claims 1-8, wherein the wireless communication circuit is of type CC 2530.

14. The wearable wireless continuous reflective oximetry device according to any one of claims 1 to 8, wherein the power circuit is of type SGM2019-3.3YN 5G.

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