CN106361307B - Wearable vital sign monitoring device and blood pressure detecting method based on light sensing - Google Patents
Wearable vital sign monitoring device and blood pressure detecting method based on light sensing Download PDFInfo
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- CN106361307B CN106361307B CN201610878741.9A CN201610878741A CN106361307B CN 106361307 B CN106361307 B CN 106361307B CN 201610878741 A CN201610878741 A CN 201610878741A CN 106361307 B CN106361307 B CN 106361307B
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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
- A61B5/02055—Simultaneously evaluating both cardiovascular condition and temperature
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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
- A61B5/021—Measuring pressure in heart or blood vessels
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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
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/02108—Measuring pressure in heart or blood vessels from analysis of pulse wave characteristics
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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
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/02141—Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits
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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
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
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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
- A61B5/68—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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/04—Constructional details of apparatus
- A61B2560/0431—Portable apparatus, e.g. comprising a handle or case
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- Heart & Thoracic Surgery (AREA)
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- General Health & Medical Sciences (AREA)
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- Vascular Medicine (AREA)
- Pulmonology (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Abstract
The present invention discloses Wearable vital sign monitoring device and blood pressure detecting method based on light sensing.Present device includes wrist-watch body housing, and the power supply module set on interior of shell, Voltage stabilizing module, control module, sensor module, set on the mode switching key of housing perimeter, set on the display module of upper surface of outer cover；It opens there are two window, three loopholes wrist-watch body housing lower surface.The present invention according at different people different moments wrist different peripheral resistances and arterial wall elasticity set characteristics of human body's parameter K, and according to the general changing rule of different time sections blood pressure, also set two correction factor α, β, and then calculate the blood pressure parameter more accurate for Different Individual.
Description
Technical field
The invention belongs to healthy wearable device fields, provide a kind of Wearable vital sign monitoring based on light sensing
Equipment and its blood pressure detecting method.
Background technique
The most representative several big vital sign parameters of human body, nothing is body temperature, heart rate, blood pressure etc., effectively to these outside
Parameter carries out detection can be well as wearer reacts their physiological status and then carries out early warning and adjustment.But how just
Benefit and the problem that always healthy wearable device field is accurately measured to blood pressure.It must in traditional blood pressure measuring method
An indispensable ring is pulsometer, and then forms the ambulatory blood pressure test macro constituted around pulsometer.Such measurement side
For the major defect of method first is that having requirement excessively " deliberately " to measurement process, state when measuring is to stablize calmness mostly
, the peak value difference that blood pressure can really reach when the data measured at this time are with respect to human motion is bigger than normal, cannot really accomplish pre-
Anti- early warning.Second is that also resulting in extremely uncomfortable user experience to the extruding in succession at wrist or arm in test process.Third is that
Circuit design in conjunction with pulsometer is complex, and volume is quite big, victory inconvenient to carry, and cost is excessively high.Fourth is that artificial when several
Between point to measure the information that resulting data reflect not comprehensive, count the epoch in big data instantly, ought to be to continuous monitoring institute
The data obtained, which are analyzed, can just obtain optimal statement-of-health.In the Intelligent hardware trend of Fast marching, blood pressure measurement is set
Standby reformed AHP is extremely urgent.
Therefore for drawbacks described above present in currently available technology, it is really necessary to be studied, provided herein is a kind of solutions
Scheme, and then solve defect existing in the prior art.
Summary of the invention
It is an object of the invention in view of the deficiencies of the prior art, provide a kind of achievable blood pressure measurement side of novelty
Case fundamentally gives up inconvenience caused by pulsometer and discomfort.It is compared with traditional equipment, reduces the production cost of equipment,
The aesthetics for improving equipment, the exquisiteness and resistance to falling property of the integral device brought under the cost for sacrificing certain continuation of the journey duration are substantially
Increase.
Light sensation of the present invention measures vital sign parameter equipment, including wrist-watch body housing, and the confession set on interior of shell
Electric module, Voltage stabilizing module, control module, sensor module are set to upper surface of outer cover set on the mode switching key of housing perimeter
Display module.
It opens there are two window, three loopholes the wrist-watch body housing lower surface；One of window is for placing
Temperature sensor receiving end makes its contact skin, another iSCSI receiving end window and three loopholes with it is photosensitive in shell
Module is corresponding, another window makes it receive reflected light, three loopholes are used respectively for placing photosensitive receiving tube receiving end
In the transmission of three LED light light；
Between four three LED light, photosensitive receiving tube components using opaque compartment design, and be mutually independent of each other respectively between
Light transmission and light-receiving.
Preferably, the position of three loopholes constitutes an equilateral triangle, for placing photosensitive receiving tube receiving end
Window is located at the center of the equilateral triangle.
The power supply module is used to power to whole system, preferably selects large capacity and light TW two wire is chargeable
3.3V lithium battery.
The mode switching key be used to switch clock rate that the newest measurement shown on display module obtains and
The working condition of photosensitive module, while saving each parameter；Preferably select light small and exquisite patch type key.
The display module is used for each clock rate that display system real-time measurement obtains, including human body temperature, environment
Temperature, ventricular systolic pressure, diastolic pressure, heart rate, time；Oled liquid crystal display is preferably used, the oled dot matrix screen is small in size, display
Graphics rich, color is beautiful, shows that content is fuller compared with general bar shaped led, has good vision appreciating, improve user
Experience.
The sensor module includes thermal module, photosensitive module, and wherein thermal module is for measuring external environment temperature
Degree and human body temperature parameter, are then sent to control module；Photosensitive module is controlled by control module to be decided whether to light LED
Lamp, after bright light, the light intensity that light intensity irradiates human skin back reflection is absorbed by the photosensitive receiving tube of photosensitive module, thus photosensitive
Occurs a voltage value on one output pin of module, which influences, while the voltage value will be sent to control
Molding block；
The Voltage stabilizing module is after connecting with the mains, and input terminal level is 3.3V, by periphery simple circuit and pressure stabilizing
After chip, output end exports the voltage signal that a level is 2.5V, and it is more stable as one which will be sent to thermal module
Reference voltage, it is preferred to use novel SOT-223 encapsulation, the encapsulated type device have the following characteristics that body compared to other
Product is small, reduces cost, reduces power consumption；
The control module is the core of circuit design, it mainly completes the collection of data, storage, and calls meter
It calculates, the index request on hardware can possess the channel AD at least three tunnels or more, and four idle I/O ports are used as external control button,
Four free time IO are as extraneous driving display module, control switch of three free time IO as light-emitting LED fluorescent tube, general control
Can be as the design chips of this project as long as chip volume is up to specification, but consider subsequent development and application, preferably
Using model cc430f5137 master chip, the low-power consumption of 430 series of products is its most outstanding feature, various suspend modes it
Between switching ensure each point of electricity of saving system, increase its cruising ability, and its mini system is from Antenna Design
Circuit supports Bluetooth wireless communication.
It is a further object to provide the blood pressure detecting methods of above system, method includes the following steps:
Step (1), system open operating mode, and the LED light of control module control photosensitive module is lighted, and send out photosensitive module
Light intensity out is agitated since target body blood vessel different moments are different degrees of, therefore photosensitive receiving tube receives the intensity of reflected light
Difference, so that output voltage values change with intensity variation.
Step (2), control module AD pin read coupled photosensitive module output voltage values in real time, thus in real time
It arrests and restores pulse wave curves, while by each moment pressure value P0(t) data are stored；
Step (3), control module in real time sample above-mentioned pulse wave curves, by comparing each in a pulse cycle
Moment blood pressure value data P0(t), obtain its maximin Pso, Pdo, Pso, Pdo also may be respectively referred to as ventricular systolic pressure and
Diastolic pressure；
In step (4), a pulse cycle, add up each moment blood pressure value data P0(t) it averages and average arteries and veins is calculated
Dynamic voltage Pm, is shown in formula (1),；Wherein Pm is obtained after carrying out integral operation by single pulse wave, the Po (t) in integral operation formula
What is represented is the pressure value of the t moment point in a pulse cycle, and To is a pulse wave cycle time, can pass through formula (2)
It is calculated.
To=60/ heart rate value formula (2)
Step (5), according to known average pulse voltage Pm, ventricular systolic pressure Pso, diastolic pressure Pdo, by formula (3),
Characteristic ginseng value K is calculated；
K=(Pm-Pdo)/(Pso-Pdo) formula (3)
Theoretically K value generally takes 0.3~0.35, if the K that actual motion acquires is near the range, data reliability
It is high.
Step (6) is obtained according to Pso, Pdo and To value and step (5) that obtain in the database obtained after statistics in advance
The characteristic ginseng value K taken, by formula (4), (5), solution obtains the α tables of data of each period, and α herein is regarded as a certain
The correction factor of moment characteristics of human body's parameter；Simultaneously according to formula (6), the β tables of data of each period, β herein is calculated
It is regarded as the correction factor of a certain moment characteristics of human body parameter.In formula, SV is stroke volume.
SV=α × PsoFormula (5)
Pdo=Pso-β × K formula (6)
The database obtained after the prior statistics can be obtained largely by buying accurate airlift pump method blood pressure measuring
Blood pressure, heart rate data, thus built-up.
Step (7), a series of more above-mentioned α, β data filter out the representative α of different time sections, and β value is as system
Number.Finally, in above-mentioned formula, α, β, K are substituted into, heart rate value is counter to be calculated Pso, Pdo.
When selecting above-mentioned representative α, β value, it is contemplated that for example people feeds, the survey generated to blood pressure of sleeping
Amount influences, and according to different time sections in 24 hours one day, from the α of corresponding period, it is flat that β tables of data calculates separately out a theory
Mean value is pre-programmed into program in case software calls different α, β value according to current time by developer.
Blood pressure parameter value Pso, Pdo measured in real time is transmitted on display module and shows by step (8), control module
Show.
Beneficial effects of the present invention are as follows:
(1) present system novel in structural design breaks original bracelet strip conventional design, using small rectangular display circle
Face, display content is fuller, focuses on user experience, and biggish fuselage is that the sensing head being placed in below display interface carries out more preferably
Ground closed processes.
(2) detection mode of the measuring system carries out budget estimation to pressure value by light sensation, is a kind of without pressure detection side
Formula.The cumbersome degree of the measurement of blood pressure is a great problem of medical profession all the time, has from invasive to noninvasive before, will have pressure
To the transformation of no pressure.
(3) during the realization of present system monitoring of blood pressure, to the difference of light when being agitated in various degree using blood vessel
Pressure value is calculated by algorithm process in refractive transmission rate.
(4) the different peripheral resistances and arterial wall elasticity of the invention also according at different people different moments wrist set one
A characteristics of human body's parameter K, and according to the general changing rule of different time sections blood pressure, two correction factors α, β are also set,
And then calculate the blood pressure parameter more accurate for Different Individual.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of measuring system of the present invention.
Fig. 2 is a kind of schematic diagram of measuring system main modular of the present invention.
Fig. 3 is a kind of software flow pattern of novel blood pressure algorithm of the present invention.
Fig. 4 is a kind of model machine schematic diagram of bracelet detection system of the present invention.
Marked in the figure: 1 is the window for placing temperature sensor receiving end, 2 is for placing photosensitive receiving tube reception
The window at end, 3 be loophole.
Specific embodiment
Below with reference to attached drawing, the invention will be further described.
In order to overcome the drawbacks of the prior art, it is high that the invention proposes a kind of Automatic survey degree, and measurement data is accurate
Portable vital sign parameter monitor system.It is external for the structural block diagram of total system of the present invention, including wrist-watch sheet referring to Fig. 1
Shell, and the power supply module set on interior of shell, Voltage stabilizing module, control module, photosensitive module, thermal module are set to watch
The mode switching key on disk periphery, the display module set on Watch dail plate upper surface.Wherein power supply module is carried out using lithium battery
Power supply, for oled screen for showing, independent key is used for switch mode.
As shown in figure 4, Watch dail plate lower surface is opened, there are two windows, three loopholes；Wherein window 1 is for placing temperature
Sensor receiving end makes it contact skin, window 2 and three loopholes 3 corresponding with the photosensitive module being set in shell, window
2, for placing photosensitive receiving tube receiving end, make it receive reflected light, three loopholes 3 are respectively used to the saturating of three LED light light
It penetrates；
Between four three LED light, photosensitive receiving tube components using opaque compartment design, and be mutually independent of each other respectively between
Light transmission and light-receiving.
The position of three loopholes constitutes an equilateral triangle, and the window for placing photosensitive receiving tube receiving end is located at should
The center of equilateral triangle.
Referring to fig. 2, block diagram is connected for the wiring of present system, wherein the SIG1 output pin of thermal module and SIG2 output
What foot respectively represented is environment temperature response parameter and target body thermotonus parameter, is all analog quantity, the two pins and
The two-way AD input of mcu is connected, by capturing the algorithm process of data to this two-way, for institute under real-time display current state
The environment temperature and human body temperature of reflection.Because algorithm is influenced by the physical distance between measurand and sensor, therefore surveying
Examination what a fixed criterion distance when using, bracelet link closely slightly wearer's wrist when, i.e., with bracelet lower housings with a thickness of away from
From standard.
Photosensitive module can draw 4 connection jaws, wherein three road connection jaws RedLight, RedOut, GLight respectively with MCU
Three control feet be connected, controlled by MCU, respectively determine light or extinguish red light, infrared and green light.Multiple color light is provided
With it is infrared, select optimal test coloured light to provide condition for subsequent debugging efforts.The module is also integrated with an infrared receiving tube:
APDS-9008；The optical information received can be converted to electric signal by he should to pass through the 4th connection jaws Signal
Analog output is to the third road channel AD of MCU.The crawl to pulse waveform is completed herein, after being sent to master chip, a side
Face obtains heart rate value, on the other hand restores waveform by algorithm, analyzes it processing, feeds back blood pressure information.In practice process, hair
Now because of profile reason, light transmittance seriously affects the capture to signal, therefore strictly carries out low transmission rate at the test module back and set
Meter.
It is present system partial circuit diagram referring to Fig. 3:
The thermal module at least has the following characteristics that temperature change sensitivity height, and data conversion is fast, strong real-time,
Data output is stablized under constant environment, and environment resistant temperature interference is strong.Therefore it is necessary to select can simultaneously feedback environment temperature and
The sensor of human body temperature parameter is modified human body temperature parameter according to varying environment temperature parameter, improves and calculates
The Reliability and anti-interference of data.Opt-538u temperature sensor is selected herein, which includes the
Two chip U2, fourth chip U4, first resistor R1, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8,
Nine resistance R9, eleventh resistor R11, the 5th capacitor C5, the 8th capacitor C8, the 9th capacitor C9, the 13rd capacitor C13, the 14th
Capacitor C14, the 15th capacitor C15, the 16th capacitor C16, the 17th capacitor C17；A termination voltage regulator circuit of first resistor R1
The 2.5V voltage of output, the other end and one end of the 5th capacitor C5, one end of the 9th capacitor C9, fourth chip U4 R pin connect
Connect the P2.0 pin for being followed by main control chip U3；The other end of the GND pin of fourth chip U4 and the 9th capacitor C9, the 5th capacitor C5
The other end connection after be grounded；The V+ pin of fourth chip U4 draws with one end of the 17th capacitor C17, the IN+ of the second chip U2
Foot connection；The V- pin of fourth chip U4 and the other end, one end of the 6th resistance R6, the 8th resistance R8 of the 17th capacitor C17
One end, the 9th resistance R9 one end connection；The 2.5V voltage of another termination voltage regulator circuit output of 6th resistance R6, the 8th electricity
The other end of resistance R8 is connect with the IN- pin of the second chip U2, one end of the 5th resistance R5, one end of the 13rd capacitor C13；The
The other end of nine resistance R9 is connect with one end of eleventh resistor R11；The Vout pin of second chip U2 and the 5th resistance R5's
One end connection of the other end, the other end of thirteenth resistor R13, one end of the 7th resistance R7, the 15th capacitor C15；Second core
The Vdd pin of piece U2 connects the 2.5V voltage of voltage regulator circuit output；The Vss pin of second chip U2 is grounded；Eleventh resistor R11's
The other end of the other end and the 15th capacitor C15, one end of the 14th capacitor C14, one end of the 16th capacitor C16, the 8th electricity
It is grounded after holding one end connection of C8；The other end of 7th resistance R7 and the other end, the 16th capacitor C16 of the 14th capacitor C14
The other end connection of the other end, the 8th capacitor C8 be followed by the P2.1 pin of main control chip U3.Second chip U2 model
The model CC430F517 of MCP6001T-I, fourth chip U4 model OTP-538U, main control chip U3.
The fast design requirement of the photosensitive mould can stablize, accurately feed back fluctuating signal waveform at wrist, and then right
This waveform carries out sampling processing, operational analysis, finally obtains and stablizes real-time blood pressure parameter.In response to this request, photosensitive module electricity
Road design includes fifth chip U5, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the 14th resistance
R14, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance R18, the 20th capacitor C20,
21 capacitor C21, the 22nd capacitor C22, the 23rd capacitor C23, the 24th capacitor C24, the 25th capacitor
C25, the 26th capacitor C26, the 27th capacitor C27, the first infrared receiving tube LED1, the second Light-emitting diode LED 2,
Three Light-emitting diode LED 3, the 4th Light-emitting diode LED 4；One end of eleventh resistor R11 and one end of twelfth resistor R12,
The IN- pin of fifth chip U5 connects, and the other end is connect with the Vout pin of fifth chip U5 to be followed by the P2.2 of master chip U3 and draw
Foot；The other end of twelfth resistor R12 is connect with one end of one end of the 25th capacitor C25, the 26th capacitor C26；The
The other end of 25 capacitor C25 is connect with one end of one end of the 24th capacitor C24, the 27th capacitor C27；20th
The anode of the other end of four capacitor C24 and the first infrared receiving tube pipe LED1, the anode of the second Light-emitting diode LED 2, third hair
One end connection of the anode of optical diode LED3, the anode of the 4th Light-emitting diode LED 4, the 14th resistance R14 is followed by power supply mould
+ 3.3V the voltage of block output；The other end of 27th capacitor C27 and the other end, the 15th resistance of the 14th resistance R14
It is grounded after the other end connection of R15；The other end of 26th capacitor C26 and one end, the 16th resistance of the 15th resistance R15
The IN+ pin connection of one end, fifth chip U5 of R16；+ the 3.3V of another termination power supply module output of 16th resistance R16
Voltage；The Vss pin of fifth chip U5 is grounded；The Vdd pin of fifth chip connects the+3.3V voltage of power supply module output；Second
One end of ten capacitor C20 and one end, one end of the 22nd capacitor C22, the 23rd capacitor C23 of the 21st capacitor C21
One end connection be followed by power supply module output+3.3V voltage；The other end of 20th capacitor C20 and the 18th resistance R18's
One end connects the P1.7 pin for being followed by main control chip U3；The other end of 21st capacitor C21 and one end of the 17th resistance R17
Connection is followed by the P1.6 pin of main control chip U3；The other end of 22nd capacitor C22 is connect with one end of thirteenth resistor R13
It is followed by the P1.5 pin of main control chip U3；The cathode of the first infrared receiving tube of another termination LED1 of 23rd capacitor C23；The
The cathode of the second Light-emitting diode LED of another termination 2 of 13 resistance R13；Another termination third of 17th resistance R17 shines
The cathode of diode (LED) 3；The cathode of the 4th Light-emitting diode LED 4 of another termination of 18th resistance R18.Wherein fifth chip
The model APDS-9008 of U5 model MCP6001T-I, the first infrared receiving tube pipe LED1, the second Light-emitting diode LED 2
Model AM2520ZGC09, the model AM2520ZGC09 of third Light-emitting diode LED 3, the 4th Light-emitting diode LED 4
Model AM2520ZGC09.
The implementation method of above system of the present invention includes the following steps:
Step (1), system open operating mode, and the LED light of control module control photosensitive module is lighted, and send out photosensitive module
Light intensity out is agitated since target body blood vessel different moments are different degrees of, therefore photosensitive receiving tube receives the intensity of reflected light
Difference, so that output voltage values change with intensity variation.
Step (2), control module AD pin read coupled photosensitive module output voltage values in real time, thus in real time
It arrests and restores pulse wave curves, while by each moment pressure value P0(t) data are stored；
Step (3), control module in real time sample above-mentioned pulse wave curves, by comparing each in a pulse cycle
Moment blood pressure value data P0(t), obtain its maximin Pso, Pdo, Pso, Pdo also may be respectively referred to as ventricular systolic pressure and
Diastolic pressure；
In step (4), a pulse cycle, add up each moment blood pressure value data P0(t) it averages and average arteries and veins is calculated
Dynamic voltage Pm, is shown in formula (1),；Wherein Pm is obtained after carrying out integral operation by single pulse wave, the Po (t) in integral operation formula
What is represented is the pressure value of the t moment point in a pulse cycle, and To is a pulse wave cycle time, can pass through formula (2)
It is calculated.
To=60/ heart rate value formula (2)
Step (5), according to known average pulse voltage Pm, ventricular systolic pressure Pso, diastolic pressure Pdo, by formula (3),
Characteristic ginseng value K is calculated；
K=(Pm-Pdo)/(Pso-Pdo) formula (3)
Theoretically K value generally takes 0.3~0.35, if the K that actual motion acquires is near the range, data reliability
It is high.
Step (6) is obtained according to Pso, Pdo and To value and step (5) that obtain in the database obtained after statistics in advance
The characteristic ginseng value K taken, by formula (4), (5), solution obtains the α tables of data of each period, and α herein is regarded as a certain
The correction factor of moment characteristics of human body's parameter；Simultaneously according to formula (6), the β tables of data of each period, β herein is calculated
It is regarded as the correction factor of a certain moment characteristics of human body parameter.In formula, SV is stroke volume.
SV=α × PsoFormula (5)
Pdo=Pso-β × K formula (6)
The database obtained after the prior statistics can be obtained largely by buying accurate airlift pump method blood pressure measuring
Blood pressure, heart rate data, thus built-up.
Step (7), a series of more above-mentioned α, β data filter out the representative α of different time sections, and β value is as system
Number.Finally, in above-mentioned formula, α, β, K are substituted into, heart rate value is counter to be calculated Pso, Pdo.
When selecting above-mentioned representative α, β value, it is contemplated that for example people feeds, the survey generated to blood pressure of sleeping
Amount influences, and according to different time sections in 24 hours one day, from the α of corresponding period, it is flat that β tables of data calculates separately out a theory
Mean value is pre-programmed into program in case software calls different α, β value according to current time by developer.
Blood pressure parameter value Pso, Pdo measured in real time is transmitted to the enterprising pedestrian's property of display module by step (8), control module
Change display, call user's attention own health.
Note: 1. in above all expression formulas, Pso, Pdo can be converted directly into maximum value in single pulse wave and
Minimum value carries out operation.But Pso, the Pdo being back-calculated to obtain are systolic pressure and diastolic pressure, are not maximin.
It is minimum when 2. blood pressure is with midnight 0~3, it is at a low ebb, later be in rising trend, morning get up after rise rapidly, about
At 8~9 up to the first peak value；It is substantially at relatively high level daytime, the second peak value occurs in 17~18 when.The blood pressure from 18
Decline, night are in relatively low level.So the present invention can use 23:00~6:00,6:01 in time segmentation selection
~10:30,10:31~1:30,1:31~17:00,17:01~19:00,19:01~22:59.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (2)
1. the Wearable vital sign monitoring device based on light sensing, it is characterised in that including wrist-watch body housing, Yi Jishe
In the power supply module of interior of shell, Voltage stabilizing module, control module, sensor module, set on the mode switching key of housing perimeter,
Set on the display module of upper surface of outer cover；
The sensor module includes thermal module, photosensitive module, wherein thermal module for measure ambient temperature and
Human body temperature parameter, is then sent to control module；Photosensitive module includes the light emitting LED lamp of three hair different colours light
Pipe, photosensitive receiving tube；Photosensitive module is controlled by control module decides whether to light light-emitting LED fluorescent tube, after bright light, light intensity irradiation
The light intensity of human skin back reflection is absorbed by the photosensitive receiving tube of photosensitive module, to go out on an output pin of photosensitive module
An existing voltage value, which influences, while the voltage value will be sent to control module；
The mode switching key is used to switch clock rate that the newest measurement shown on display module obtains and photosensitive
The working condition of module, while saving each parameter；
The display module for showing each clock rate that equipment real-time measurement obtains, including human body temperature, environment temperature,
Ventricular systolic pressure, diastolic pressure, heart rate, time；
The control module possesses the channel AD at least three tunnels or more, and four idle I/O ports are used as external control button, and four
Idle IO is as extraneous driving display module, control switch of three free time IO as light-emitting LED fluorescent tube；
It opens there are two window, three loopholes the wrist-watch body housing lower surface；One of window is for placing temperature
Module receiving end makes it contact skin, another window and three loopholes corresponding with the photosensitive module being set in shell, separately
One window makes its receive reflected light for placing photosensitive receiving tube receiving end, three loopholes be respectively used to three it is light-emitting LED
The transmission of fluorescent tube light；
Between four three light-emitting LED fluorescent tubes, photosensitive receiving tube components using opaque compartment design, and be mutually independent of each other respectively between
Light transmission and light-receiving；
The position of three loopholes constitutes an equilateral triangle, the window for placing photosensitive receiving tube receiving end be located at this positive three
Angular center；
The application method of the above-mentioned Wearable vital sign monitoring device based on light sensing, method includes the following steps:
The LED lamp tube of step (1), opening of device operating mode, control module control photosensitive module is lighted, and photosensitive module is issued
Light intensity is agitated since target body blood vessel different moments are different degrees of, therefore photosensitive receiving tube receives the intensity of reflected light not
Together, so that output voltage values change with intensity variation；
Step (2), control module AD pin read coupled photosensitive module output voltage values in real time, to arrest in real time
Restore pulse wave curves, while by each moment blood pressure value data P0(t) it is stored；
Step (3), control module in real time sample above-mentioned pulse wave curves, by comparing each moment in a pulse cycle
Blood pressure value data P0(t), its ventricular systolic pressure Pso, ventricular diastole pressure Pdo are obtained；
In step (4), a pulse cycle, add up each moment blood pressure value data P0(t) it averages and average pulse voltage is calculated
Pm is shown in formula (1)；Wherein P0(t) pressure value of the t moment in a pulse cycle, T are indicated0When indicating a pulse wave cycle
Between；
T0=60/ heart rate value formula (2)
Step (5) presses Pdo according to known average pulse voltage Pm, ventricular systolic pressure Pso, ventricular diastole, by formula (3),
Characteristic ginseng value K is calculated；
K=(Pm-Pdo)/(Pso-Pdo) formula (3)
Step (6), basis count Pso, Pdo and the T obtained in obtained database in advance0The spy that value and step (5) obtain
Parameter value K is levied, by formula (4), (5), solution obtains the α tables of data of each period, and α represents a certain moment characteristics of human body parameter
Correction factor；Simultaneously according to formula (6), the β tables of data of each period is calculated, β represents a certain moment characteristics of human body ginseng
Several correction factors；In formula, SV is stroke volume；
SV=α × PsoFormula (5)
Pdo=Pso- β × K formula (6)
Step (7), a series of more above-mentioned α, β data filter out not according to different time sections changing rule in 24 hours one day
With the α that the period is representative, β value is as coefficient；In above-mentioned formula (4), (5), (6), α, β, K are substituted into, heart rate value is anti-
Ventricular systolic pressure Pso in different time periods, diastolic pressure Pdo is calculated；
Step (8), control module by the ventricular systolic pressure Pso measured in real time, to be transmitted to display module enterprising by ventricular diastole pressure Pdo
Row display.
2. the Wearable vital sign monitoring device based on light sensing as described in claim 1, it is characterised in that described
Power supply module is rechargeable type lithium battery.
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| CN107510445A (en) * | 2017-09-30 | 2017-12-26 | 珠海市富立信医疗设备应用技术开发有限公司 | A kind of remote ecg pressure measurement watch |
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| CN105054918B (en) * | 2015-07-28 | 2018-05-22 | 杭州暖芯迦电子科技有限公司 | A kind of blood pressure computational methods and blood pressure instrument based on the pulse reflective wave transmission time |
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