CN109350021B - Multi-parameter wrist type vital sign monitoring device and low-power-consumption working method thereof - Google Patents

Multi-parameter wrist type vital sign monitoring device and low-power-consumption working method thereof Download PDF

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CN109350021B
CN109350021B CN201811433295.6A CN201811433295A CN109350021B CN 109350021 B CN109350021 B CN 109350021B CN 201811433295 A CN201811433295 A CN 201811433295A CN 109350021 B CN109350021 B CN 109350021B
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data
module
core processing
heart rate
processing module
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CN109350021A (en
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马乾峰
李章勇
李国权
田�健
张丽昕
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Chongqing University of Post and Telecommunications
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Chongqing University of Post and Telecommunications
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
    • A61B5/0225—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
    • A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6802—Sensor mounted on worn items
    • A61B5/681—Wristwatch-type devices

Abstract

The invention discloses a multi-parameter wrist type vital sign monitoring device which comprises a blood oxygen heart rate acquisition module, a blood pressure acquisition module, a core processing module, a power supply module and a data transmission module, wherein the blood oxygen heart rate acquisition module is connected with the power supply module; the low-power consumption working method comprises the following steps: and judging whether the device is worn well or not, starting normal work after the device is worn well, otherwise, realizing automatic detection and work of the device by low power supply standby, starting detection after the device is worn well, automatically checking whether the device stops working or not by the device after one-time detection is finished and data is transmitted, and automatically entering a work stop mode if not. Has the advantages that: the method has the advantages of low cost, quick effect and obvious effect in reducing the power consumption of the equipment from the perspective of system-level design, and can reasonably control the core operation mode and the resource distribution of the chip in the whole equipment working process on the premise of not influencing the working performance of the equipment, thereby meeting the purpose of low-power design.

Description

Multi-parameter wrist type vital sign monitoring device and low-power-consumption working method thereof
Technical Field
The invention relates to the technical field of portable sign detection equipment, in particular to a multi-parameter wrist type vital sign monitoring device and a low-power-consumption working method thereof.
Background
With the continuous development of electronic technology, wearable equipment is more and more concerned and loved by people. When the life of people is greatly facilitated by small, powerful and portable wearable equipment, the wearable equipment is continuously developing towards high performance, high reliability and accurate measurement. The cost is that the power consumption is improved, the working time of the equipment is shortened, and the experience of the user on the equipment is greatly reduced while the performance of the equipment is improved in all aspects. Under the influence of the limited volume factor of the wearable device, a battery with large capacity and large volume cannot be built in, so that the consideration of the performance and the low-power design of the wearable device becomes an urgent problem to be solved.
When the bottleneck is reached in the field of hardware design, how to ensure that the energy consumption of the equipment is reduced becomes a difficult problem on the premise of not influencing the working performance of the equipment.
Disclosure of Invention
Aiming at the problems existing in the background, the invention provides the multi-parameter wrist vital sign monitoring device and the low-power-consumption working method thereof, the device has the advantages of low cost, quick effect and obvious effect in the aspect of system-level design, the core operation mode and the resource distribution of a chip are reasonably controlled in the whole device working process on the premise of not influencing the working performance of the device, and the purpose of low-power-consumption design can be met.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
a multi-parameter wrist type vital sign monitoring device comprises a blood oxygen heart rate acquisition module, a blood pressure acquisition module, a core processing module, a power supply module and a data transmission module, wherein the output end of the blood oxygen heart rate acquisition module and the output end of the blood pressure acquisition module are respectively connected with an input end group of the core processing module, the core processing module schedules and processes the working content and the energy consumption mode of each module, carries out data frame packing on the received three parameters of blood oxygen, heart rate and blood pressure to obtain a data packet, and the data packet is sent to a receiving terminal through the data transmission module;
the power module supplies power for the blood oxygen heart rate acquisition module, the blood pressure acquisition module, the core processing module and the data transmission module.
Through the design, the core processing module receives blood oxygen, heart rate and blood pressure data acquired by the blood oxygen heart rate acquisition module and the blood pressure acquisition module, and dispatches the work of each module according to the data condition, so that the work power consumption is as low as possible, a large amount of electric power which does not need to be consumed is saved, and the service life of the equipment is longer.
In a further design, the data transmission module is an NFC module, and the receiving terminal is an NFC reading device.
The characteristics of NFC module can be after writing in data open card analog mode, and NFC module itself is in not power consumptive state promptly, when NFC reading device was close to the NFC module and reads, gives the NFC module power supply through NFC radio frequency signal to make the NFC module with the data feedback of writing in before to the NFC reading device, the energy that receiving and dispatching signal can not lose equipment itself.
In a further design, the display module further comprises a display module, and the input end group of the display module is connected with the display output end group of the core processing module. The collected data and the processed data can be displayed by the display module and visually expressed to a user.
A low-power consumption working method of a multi-parameter wrist type vital sign monitoring device comprises the following contents:
step one, a core processing module judges whether the device is worn perfectly or not, the device enters a standby mode if the device is not worn perfectly, and the device starts to work if the device is worn perfectly;
step two, the blood oxygen heart rate acquisition module and the blood pressure acquisition module acquire the frequency f1Time interval t of acquisition1Collecting blood oxygen, heart rate and blood pressure parameters within the time T, and sending the parameters to a core processing module in real time;
step three, the core processing module packs the blood oxygen, heart rate and blood pressure parameters within the time T by data frames to obtain data packets;
step four, the core processing module encrypts the data packet, sends the data packet to the data transmission module and finally sends the data packet to the receiving terminal;
step five, after the data packet is transmitted to the data transmission module for n seconds, if the device does not enter a work stopping mode, the core processing module closes the clocks of the blood oxygen heart rate acquisition module, the blood pressure acquisition module and the data transmission module, and the working current of the core processing module is changed from I3Is adjusted to I4，I3>I4And the device enters a stop working mode and waits for next awakening.
The worn equipment needs to judge whether the equipment is worn or not, when the equipment is not worn, the detected data has no practical significance, the equipment does not need to directly start detection, the work at the moment needs to be controlled in a mode with low power consumption, namely, the step one judges whether the equipment is worn perfectly or not, the equipment starts to work normally after being worn, otherwise, the equipment is in low power supply standby, the automatic detection and the work of the equipment can be realized, the detection is started after being worn, a switch for detecting is not needed to be manually controlled, the time for waiting for the detection work after being worn is also saved, and the power consumption is also saved; after the detection is finished once and the data is transmitted, the device can be closed, the device can automatically check whether the device stops working or not, if not, the device automatically enters a working stopping mode, and continuous standby power consumption is avoided.
The specific step one content is as follows:
a1, presetting a reflected light threshold of a blood oxygen heart rate acquisition module by the core processing module;
a2, after the core processing module receives the reflected light intensity signal of the blood oxygen heart rate acquisition module in real time, if the reflected light intensity signal is smaller than the reflected light threshold value, the device is judged not to be worn, and the step A3 is entered, otherwise the step II is entered;
a3, the core processing module makes the working current of the blood oxygen heart rate acquisition module from I1Is adjusted to I2，I1>I2And returns to a 2.
According to people's the habit of wearing, blood pressure acquisition module (generally for blood pressure detection air belt) is bigger than blood oxygen heart rate acquisition module (like finger blood oxygen photoelectric detection finger clip) volume, then wear behind the blood oxygen heart rate acquisition module meeting, if blood oxygen heart rate acquisition module has worn, then whole device has just also been worn, consequently above-mentioned design can be based on blood oxygen heart rate acquisition module's reflected light intensity signal and judge whether the device has worn, when wearing, reflected light intensity signal can be higher than a definite value (reverberation threshold), just can obtain the condition of wearing through the comparison of numerical value promptly, reverberation intensity signal is less than the reverberation threshold, can judge that the device does not wear, with blood oxygen heart rate acquisition module's operating current turndown, make the work energy consumption of whole device reduce.
The third concrete step includes the following contents:
b1, the core processing module receives the parameters of blood oxygen, heart rate and blood pressure in real time and forms a group of data group by the three parameters at the same time;
b2, the core processing module continuously extracts a group of data groups adjacent to the current time over time;
b3, comparing each parameter in the group a data set with its corresponding normal sign interval, if each isOne parameter value is within a normal sign interval, and the core processing module enables the acquisition frequency of the device to be f1Is adjusted to f2The acquisition interval duration is t1Is adjusted to t2，f1>f2，t1>t2Entering B4;
otherwise, keeping the current acquisition frequency and returning to B2;
b4, when any parameter value in the a group data group at any moment is not in the normal sign interval, the core processing module makes the acquisition frequency of the device from f2Is adjusted back to f1The acquisition interval duration is t2Adjust back to t1；
And B5, until the time T is finished, the core processing module packs the data frame of the acquired data group to obtain a data packet.
According to the design, the control characteristic of the device is that in the data detection process, the reference value of abnormal physical sign data is higher than normal, if the physical sign data is always in a normal interval, the reference value of the normal data is lower, the time interval of collection of the blood oxygen heart rate collection module and the blood pressure collection module and the collection frequency of each collection (equivalent to the frequency of each collection) can be properly adjusted to be shorter, and once the physical sign data is abnormal, the collection frequency is adjusted back, so that on one hand, the power consumption is reduced, on the other hand, the data volume can be reduced, and the processing complexity of the data is reduced to the lowest.
Further, the data packet in B5 is composed of a data header, a data field, and a data trailer;
the data header comprises a start bit of 1 byte, a message number of 1 byte and a data area length of 2 bytes, wherein the content of the start bit is 0xA0, the content of the message number is a number between 0 and 255, the message number of a first data packet is a random value, the message number of each subsequent data packet is the previous value plus one, and the data area length is the actual data length of the data area;
the data area occupies 22 bytes, wherein the data area comprises 10 groups of blood oxygen parameters, 10 groups of heart rate parameters and 1 group of blood pressure parameters, each group of blood oxygen parameters occupies 1 byte, each group of heart rate parameters occupies 1 byte, and each group of blood pressure parameters occupies 2 bytes;
the data tail comprises a check code of 1 byte and an end bit of 1 byte, and the content of the end bit is 0xF 0.
The format of the data packet is favorable for checking in the data transmission process, when checking, the start bit is checked firstly, the whole content of the data head and the data area is compared, the end bit is checked finally, the check is correct only when the three parts are completely consistent, otherwise, the data are error data, once the transmitted data are not correct, the data are read once by being close to the NFC module, and the data transmission method is convenient and fast.
Meanwhile, the data frame packing in B5 also includes the following:
b5.1, the core processing module judges whether the acquisition frequency of each group of data sets is f1If yes, the data set is retained and enters B5.4, otherwise, enters B5.2;
b5.2, calling B groups of data groups before and after the data group;
b5.3, judging whether the acquisition frequencies of the B groups of data groups are consistent, if so, deleting the c group of data groups, and only reserving the B-c group of data groups, wherein c is less than B;
and B5.4, carrying out data frame packing on all the reserved data groups to obtain a data packet.
Because the reference value of the normal sign data is low, the continuous normal sign data is partially deleted by the design for facilitating subsequent processing, only the monitored sign within a period of time needs to be normal, and the abnormal content is completely reserved, so that the important data of actual monitoring is reflected, the data volume of a data packet can be greatly reduced, and the time and energy consumption of data processing are also indirectly reduced.
Furthermore, the data transmission module is an NFC module, the core processing module sends the data packet to the NFC module, sets the NFC module to a card simulation mode, and starts a standby setting of the NFC module. The NFC module can be written into after the data frame of the core processing module is packaged, the device can be set to be in a work stop mode after the card simulation mode of the NFC module is opened, the data transmission of the NFC module is not power-consuming any more, and the electric quantity of the whole device can be almost not consumed after the data packaging is completed.
And in a further design, the core processing module control device enters a work stopping mode in the collection interval time periods of the blood oxygen heart rate collection module and the blood pressure collection module.
The above-mentioned working modes include a normal working mode, a standby mode, a card simulation mode and a stop mode, wherein the normal working mode is a working mode in which the working current is maintained at a higher level, the standby mode is a working mode in which the working current is lower, the modules still work at a lower level in the working mode, the card simulation mode is a passive reading mode of the NFC module, the power thereof is provided by an NFC radio frequency signal of the reading device, and the stop mode is to turn off all the working modules and only reserve an RTC clock for waking up.
The invention has the beneficial effects that: the method has the advantages of low cost, quick effect and obvious effect in reducing the power consumption of the equipment from the perspective of system-level design, and can reasonably control the core operation mode and the resource distribution of the chip in the whole equipment working process on the premise of not influencing the working performance of the equipment, thereby meeting the purpose of low-power design.
Drawings
FIG. 1 is a block diagram of a monitoring device;
FIG. 2 is a schematic structural view of the embodiment;
FIG. 3 is a block flow diagram of a method;
FIG. 4 is a workflow diagram of an embodiment;
fig. 5 is a flow chart of a packet verification method.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific embodiments:
as shown in fig. 1, a multi-parameter wrist type vital sign monitoring device comprises a blood oxygen heart rate acquisition module, a blood pressure acquisition module, a core processing module, a power supply module, a data transmission module and a display module,
the output end of the blood oxygen and heart rate acquisition module and the output end of the blood pressure acquisition module are respectively connected with the input end group of the core processing module, the core processing module schedules and processes the working content and the energy consumption mode of each module, and carries out data frame packing on the received three parameters of blood oxygen, heart rate and blood pressure to obtain a data packet, and the data packet is sent to a receiving terminal through the data transmission module; and the input end group of the display module is connected with the display output end group of the core processing module.
The power module supplies power for the blood oxygen heart rate acquisition module, the blood pressure acquisition module, the core processing module, the data transmission module and the display module.
The data transmission module is preferably an NFC module, and the receiving terminal is an NFC reading device.
As shown in fig. 2, the blood oxygen heart rate acquisition module is preferably a blood oxygen heart rate finger clip 1, which acquires blood oxygen heart rate parameters by using a MAX30102 sensor, the sensor is internally provided with an a/D converter, and can directly read a converted digital PPG signal value from a FIFO register, calculate the blood oxygen heart rate value by using the lambertian law through a program, and send the blood oxygen heart rate value to the core processing module through an I2C interface, wherein the acquisition frequency is defaulted to be acquired once every 30 seconds, is not limited to the frequency, and can be formulated according to the situation;
the blood pressure acquisition module is preferably a blood pressure cuff 2, comprises a pressure sensor, a module main control chip and an A/D conversion chip, calculates a blood pressure value by an oscillometric method, transmits data to the core processing module through an I2C interface, acquires the data once every 5 minutes, is not limited to the frequency, and can be formulated according to conditions;
the core processing module is arranged in the processing shell 3, and in the specific embodiment, the STM32F103RCT6 is used as a main control chip of the core processing module, the chip is a 32-bit microcontroller based on an ARM Cortex-M kernel, is specially designed for embedded application requiring high performance, low cost and low power consumption, has abundant interfaces and peripheral resources, and can meet the requirements of the invention. The core processing module is used for carrying out data frame packaging, verification, encryption and other processing on the received blood oxygen parameter, the received heart rate parameter and the received blood pressure parameter, displaying results of the three parameters on the display module, and meanwhile sending the data packet to the NFC module.
The display module is installed on the surface of the processing shell 3, and the OLED screen is adopted to display the result values of the three parameters of blood oxygen, heart rate and blood pressure.
The NFC module is integrated in the processing shell 3, and uses RF430CL330H as an NFC communication chip, which can be used as an NFC TYPE 4 tag, and can reach a transmission rate of 848kbps at the highest, and has an operating frequency band of 13.56MHz, and can automatically identify the structure of the NFC data exchange format. And writing the data processed by the core processing module into the NFC module through the I2C interface, and then transmitting the data to the terminal reading module in an NFC communication mode.
A power supply module is also integrated in the processing case 3, and in order to satisfy the portability of the device, the entire device is supplied with power using a lithium battery.
A low power consumption operation method of a multi-parameter wrist vital signs monitoring device, as shown in fig. 3:
step one, a core processing module judges whether the device is worn perfectly or not, the device enters a standby mode if the device is not worn perfectly, and the device starts to work if the device is worn perfectly;
step two, the blood oxygen heart rate acquisition module and the blood pressure acquisition module acquire the frequency f1Time interval t of acquisition1Collecting blood oxygen, heart rate and blood pressure parameters within the time T, and sending the parameters to a core processing module in real time;
step three, the core processing module packs the blood oxygen, heart rate and blood pressure parameters within the time T by data frames to obtain data packets;
step four, the core processing module encrypts the data packet, sends the data packet to the data transmission module and finally sends the data packet to the receiving terminal;
step five, after the data packet is transmitted to the data transmission module for n seconds, if the device does not enter a work stopping mode, the core processing module closes the clocks of the blood oxygen heart rate acquisition module, the blood pressure acquisition module and the data transmission module, and the working current of the core processing module is changed from I3Is adjusted to I4，I3>I4And the device enters a stop working mode and waits for next awakening.
The data transmission module is an NFC module, the core processing module sends the data packet to the NFC module, the NFC module is set to be in a card simulation mode, and the standby setting of the NFC module is started.
And in the collection interval time period of the blood oxygen heart rate collection module and the blood pressure collection module, the core processing module control device enters a work stopping mode.
In this embodiment, the working method is as shown in fig. 4:
the specific content of the step one is as follows:
a1, presetting a reflected light threshold of a blood oxygen heart rate acquisition module by the core processing module;
a2, after the core processing module receives the reflected light intensity signal of the blood oxygen heart rate acquisition module in real time, if the reflected light intensity signal is smaller than the reflected light threshold value, the device is judged not to be worn, and the step A3 is entered, otherwise the step II is entered;
a3, the core processing module makes the working current of the blood oxygen heart rate acquisition module from I1Is adjusted to I2，I1>I2And returns to a 2.
The third step comprises the following steps:
b1, the core processing module receives the parameters of blood oxygen, heart rate and blood pressure in real time and forms a group of data group by the three parameters at the same time;
b2, the core processing module continuously extracts a group of data groups adjacent to the current time over time;
b3, comparing each parameter in the a group data set with the corresponding normal sign interval, if each parameter is in the normal sign interval, the core processing module makes the collection frequency of the device from f1Is adjusted to f2The acquisition interval duration is t1Is adjusted to t2，f1>f2，t1>t2Entering B4;
otherwise, keeping the current acquisition frequency and returning to B2;
b4, when any parameter value in the a group data group at any moment is not in the normal sign interval, the core processing module makes the acquisition frequency of the device from f2Is adjusted back to f1The acquisition interval duration is t2Adjust back to t1；
And B5, until the time T is finished, the core processing module packs the data frame of the acquired data group to obtain a data packet.
The data frame packing in the B5 further includes the following contents:
b5.1, the core processing module judges whether the acquisition frequency of each group of data sets is f1If yes, the data set is retained and enters B5.4, otherwise, enters B5.2;
b5.2, calling B groups of data groups before and after the data group;
b5.3, judging whether the acquisition frequencies of the B groups of data groups are consistent, if so, deleting the c group of data groups, and only reserving the B-c group of data groups, wherein c is less than B;
and B5.4, carrying out data frame packing on all the reserved data groups to obtain a data packet.
Preferably, the data packet in step three is as shown in table 1, and consists of a data header, a data area, and a data trailer;
the data header comprises a start bit of 1 byte, a message number of 1 byte and a data area length of 2 bytes, wherein the content of the start bit is 0xA0, the content of the message number is a number between 0 and 255, the message number of a first data packet is a random value, the message number of each subsequent data packet is the previous value plus one, and the data area length is the actual data length of the data area;
the data area occupies 22 bytes, wherein the data area comprises 10 groups of blood oxygen parameters, 10 groups of heart rate parameters and 1 group of blood pressure parameters, each group of blood oxygen parameters occupies 1 byte, each group of heart rate parameters occupies 1 byte, and each group of blood pressure parameters occupies 2 bytes;
the data tail comprises a check code of 1 byte and an end bit of 1 byte, and the content of the end bit is 0xF 0.
TABLE 1
Figure BDA0001883151710000111
The specific data area is preferably designed as in table 2:
TABLE 2
Figure BDA0001883151710000112
The verification of the data packet is shown in fig. 5:
s1, the NFC reading terminal decrypts the communication data;
s2, judging whether the initial bit of the decrypted data head is equal to 0xA0, if yes, entering the next step, otherwise, discarding the received communication data;
s3, carrying out CRC check from the start bit of the data head to the last bit of the data area, comparing the check value with the check code of the data tail, if the two are identical, entering the next step, otherwise discarding the received communication data;
s4, judging whether the data tail end bit is equal to 0xF0, if yes, entering the next step, otherwise, discarding the received communication data;
and S5, identifying the communication data as a data packet and uploading the data packet to an upper computer.
Wherein, step S3 further includes the following contents:
s3.1, performing CRC from the start bit of the data head to the last bit of the data area, comparing the check value with the check code of the data tail, and if the check value is consistent with the check code of the data tail, entering S4, otherwise, entering S3.2;
s3.2, judging the position of error data in the communication data according to the remainder item of the CRC, if the error data belongs to blood oxygen/heart rate, entering the next step, and otherwise, discarding the received communication data;
and S3.3, judging whether the range of the error data is less than or equal to 1 byte, if so, setting the error byte to be 0, and entering S4, otherwise, discarding the communication data received this time.
The present embodiment sets its measurement time interval to 5 minutes for blood pressure measurements with higher power consumption and to 30s for blood oxygen heart rate measurements with lower power consumption.
The blood oxygen heart rate acquisition module sets a reflected light threshold value, sets PROX _ INT _ THRESH [7:0] in MAX30102 to be 0x01, namely the threshold value is set to be 1023, because the chip can obtain a PPG signal digital value after ADC from the FIFO register, the digital value obtained in the register can be compared with the set threshold value, when the intensity of the reflected light is smaller than the set threshold value, namely when a finger is not placed on the sensor, the LED current is reduced, the intensity of LED light is reduced, the value of the PILOT _ PA [7:0] register is set to be 0x02, at the moment, the standby current is about 0.2mA, and the standby mode when no measurement is carried out is realized; when the intensity of the reflected light is greater than the set threshold value, that is, when a finger is placed on the sensor, the LED current is adjusted to be larger, the registers of REG _ LED1_ PA and REG _ LED2_ PA are set to 0x24, and at this time, the operating current is about 7mA to reach the normally measured light intensity, and the normal operating mode is started.
The value of SPO2_ SR [2:0] in the register of 0x0A is set to 011, i.e., the sampling rate of the PPG signal by the blood oxygen heart rate acquisition module is set to 400Hz when the measurement is started. In the process of 10 groups of measurement and calculation of the heart rate blood oxygen value, if the heart rate is kept at 60-100 all the time, the blood oxygen is kept at more than 90%, the high pressure is 90-140, and the low pressure is 60-90 in the normal range, the value of SPO2_ SR [2:0] in a register of 0x0A is set to 001, the sampling rate of a PPG signal is reduced to 100Hz, and the blood oxygen heart rate acquisition time interval is prolonged to 1 minute.
If any abnormity is found in the measurement process of blood oxygen, heart rate and blood pressure, for example, the obtained result value is not in a normal range, and the sudden change amplitude of the PPG signal exceeds a threshold value, the sampling rate and the measurement interval of the blood oxygen and heart rate acquisition module are immediately restored to 400Hz and 30s for continuous measurement.
The power consumption conditions of the three working modes of the NFC are comprehensively compared, the card simulation mode with the lowest power consumption is selected as the working mode of the NFC module, and meanwhile, the STANDBY _ ENABLE of the CONTROL _ REG register in the NFC communication chip RF430CL330H is set to be 1, so that the lowest power consumption of the NFC module is realized.
During the measurement interval period of blood oxygen heart rate and blood pressure, the stop mode of the core processing module is used: all clocks have stopped; 1.8V kernel power supply works; PLL, HIS and HSERC oscillator function disable; the register and the SRAM content are reserved, the overall power consumption of the system can be reduced on the premise that the measured data are not lost, and the whole system is awakened to enter a normal working mode through an RTC ALARM event when the interval time is over.
Normal operating current of the core processing module: 93.6 to 95.5mA, and 53.0 to 53.2mA in the stop mode, wherein the measured working current of the blood oxygen heart rate acquisition module is as shown in Table 3:
TABLE 3
100Hz Sampling 400Hz Sampling
Current(under threshold) 2.1mA～2.2mA 2.1mA～2.2mA
Current(above threshold) 3.8mA～4.5mA 8.22mA～8.24mA
It can be seen that the working current is always kept between 2.1mA and 2.2mA below the threshold of the reflected light, so that the power is saved, the acquisition frequency is reduced to 100Hz when the physical sign parameters are in the normal interval, the working current is 3.8mA to 4.5mA at the moment, which is about half lower than the working current 8.22mA to 8.24mA at the time of abnormity, and the energy consumption of the whole work is greatly reduced.

Claims (6)

1. A low-power consumption working method of a multi-parameter wrist type vital sign monitoring device is characterized by comprising the following steps: the multiparameter wrist type vital sign monitoring device comprises a blood oxygen heart rate acquisition module, a blood pressure acquisition module, a core processing module, a power supply module and a data transmission module, wherein the output end of the blood oxygen heart rate acquisition module and the output end of the blood pressure acquisition module are respectively connected with the input end group of the core processing module, the data transmission module is an NFC module, the power supply module supplies power for the blood oxygen heart rate acquisition module, the blood pressure acquisition module, the core processing module and the data transmission module, and the low-power-consumption working method comprises the following steps:
step one, a core processing module judges whether the device is worn perfectly or not, the device enters a standby mode if the device is not worn perfectly, and the device starts to work if the device is worn perfectly;
step two, the blood oxygen heart rate acquisition module and the blood pressure acquisition module acquire the frequency f1Time interval t of acquisition1Collecting blood oxygen, heart rate and blood pressure parameters within the time T, and sending the parameters to a core processing module in real time;
step three, the core processing module packs the blood oxygen, heart rate and blood pressure parameters within the time T by data frames to obtain data packets;
step four, the core processing module encrypts the data packet, sends the data packet to the data transmission module and finally sends the data packet to the receiving terminal;
step five, after the data packet is transmitted to the data transmission module for n seconds, if the device does not enter a work stopping mode, the core processing module closes the clocks of the blood oxygen heart rate acquisition module, the blood pressure acquisition module and the data transmission module, and the working current of the core processing module is changed from I3Is adjusted to I4，I3>I4The device enters a stop working mode and waits for next awakening;
the data packet in the third step consists of a data head, a data area and a data tail;
the data header comprises a start bit of 1 byte, a message number of 1 byte and a data area length of 2 bytes, wherein the content of the start bit is 0xA0, the content of the message number is a number between 0 and 255, the message number of a first data packet is a random value, the message number of each subsequent data packet is the previous value plus one, and the data area length is the actual data length of the data area;
the data area occupies 22 bytes, wherein the data area comprises 10 groups of blood oxygen parameters, 10 groups of heart rate parameters and 1 group of blood pressure parameters, each group of blood oxygen parameters occupies 1 byte, each group of heart rate parameters occupies 1 byte, and each group of blood pressure parameters occupies 2 bytes;
the data tail comprises a check code of 1 byte and an end bit of 1 byte, and the content of the end bit is 0xF 0;
the verification method of the data packet comprises the following steps:
s1, the NFC reading terminal decrypts the communication data;
s2, judging whether the initial bit of the decrypted data head is equal to 0xA0, if yes, entering the next step, otherwise, discarding the received communication data;
s3, carrying out CRC check from the start bit of the data head to the last bit of the data area, comparing the check value with the check code of the data tail, if the two are identical, entering the next step, otherwise discarding the received communication data;
s4, judging whether the data tail end bit is equal to 0xF0, if yes, entering the next step, otherwise, discarding the received communication data;
s5, identifying the communication data as a data packet and uploading the data packet to an upper computer;
wherein, step S3 further includes the following contents:
s3.1, performing CRC from the start bit of the data head to the last bit of the data area, comparing the check value with the check code of the data tail, and if the check value is consistent with the check code of the data tail, entering S4, otherwise, entering S3.2;
s3.2, judging the position of error data in the communication data according to the remainder item of the CRC, if the error data belongs to blood oxygen/heart rate, entering the next step, and otherwise, discarding the received communication data;
and S3.3, judging whether the range of the error data is less than or equal to 1 byte, if so, setting the error byte to be 0, and entering S4, otherwise, discarding the communication data received this time.
2. The low power consumption operation method according to claim 1, wherein the specific content of the first step is:
a1, presetting a reflected light threshold of a blood oxygen heart rate acquisition module by the core processing module;
a2, after the core processing module receives the reflected light intensity signal of the blood oxygen heart rate acquisition module in real time, if the reflected light intensity signal is smaller than the reflected light threshold value, the device is judged not to be worn, and the step A3 is entered, otherwise the step II is entered;
a3, the core processing module makes the working current of the blood oxygen heart rate acquisition module from I1Is adjusted to I2，I1>I2And returns to a 2.
3. The low power consumption operation method according to claim 1, wherein the third step comprises the following steps:
b1, the core processing module receives the parameters of blood oxygen, heart rate and blood pressure in real time and forms a group of data group by the three parameters at the same time;
b2, the core processing module continuously extracts a group of data groups adjacent to the current time over time;
b3, comparing each parameter in the a group data set with the corresponding normal sign interval, if each parameter is in the normal sign interval, the core processing module makes the collection frequency of the device from f1Is adjusted to f2The acquisition interval duration is t1Is adjusted to t2，f1>f2，t1>t2Entering B4;
otherwise, keeping the current acquisition frequency and returning to B2;
b4, when any parameter value in the a group data group at any moment is not in the normal sign interval, the core processing module makes the acquisition frequency of the device from f2Is adjusted back to f1The acquisition interval duration is t2Adjust back to t1；
And B5, until the time T is finished, the core processing module packs the data frame of the acquired data group to obtain a data packet.
4. The low power consumption operation method according to claim 3, wherein: the data frame packing in the B5 further includes the following contents:
b5.1, the core processing module judges whether the acquisition frequency of each group of data sets is f1If yes, the data set is retained and enters B5.4, otherwise, enters B5.2;
b5.2, calling B groups of data groups before and after the data group;
b5.3, judging whether the acquisition frequencies of the B groups of data groups are consistent, if so, deleting the c group of data groups, and only reserving the B-c group of data groups, wherein c is less than B;
and B5.4, carrying out data frame packing on all the reserved data groups to obtain a data packet.
5. The low power consumption operation method according to claim 1, wherein: the data transmission module is an NFC module, the core processing module sends the data packet to the NFC module, the NFC module is set to be in a card simulation mode, and the standby setting of the NFC module is started.
6. The low power consumption operation method according to claim 1, wherein: and in the collection interval time period of the blood oxygen heart rate collection module and the blood pressure collection module, the core processing module control device enters a work stopping mode.
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