CN107468227A - A kind of signal projector and PPG information collecting device - Google Patents
A kind of signal projector and PPG information collecting device Download PDFInfo
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- CN107468227A CN107468227A CN201710818129.7A CN201710818129A CN107468227A CN 107468227 A CN107468227 A CN 107468227A CN 201710818129 A CN201710818129 A CN 201710818129A CN 107468227 A CN107468227 A CN 107468227A
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- signal
- light emitting
- drive module
- emitting devices
- optical signal
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- 230000003287 optical effect Effects 0.000 claims abstract description 66
- 238000012545 processing Methods 0.000 claims description 19
- 238000004088 simulation Methods 0.000 claims description 4
- 210000001217 buttock Anatomy 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 description 9
- 239000008280 blood Substances 0.000 description 9
- 210000004369 blood Anatomy 0.000 description 9
- 210000000577 adipose tissue Anatomy 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 6
- 210000004204 blood vessel Anatomy 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003862 health status Effects 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Classifications
-
- 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
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
-
- 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
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
-
- 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
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/06—Accessories for medical measuring apparatus
Abstract
The invention discloses a kind of signal projector, including drive module and light emitting devices, the output end of the drive module connects the input of the light emitting devices；The drive module is to the light emitting devices output current；The light emitting devices launches optical signal with default incident angle to human body skin, so that the optical signal carries PPG information from human body skin outgoing after entering human vas, wherein, the optical signal is corresponding with the output current of the drive module, and the default incident angle is more than 13.8 ° and less than 15.5 °.The invention also discloses a kind of PPG information collecting devices including above-mentioned signal projector.The present invention, which realizes, to gather PPG information in human body thickness fat sites so that people can gather PPG information in the state of unaware, find the exception of physiological characteristic early.
Description
Technical field
The present embodiments relate to bio-signal acquisition field, more particularly to a kind of signal projector and PPG information gatherings
Equipment.
Background technology
Nowadays people increasingly pay close attention to the health status of itself, and physiological parameter such as heart rate, blood oxygen saturation etc. of human body are equal
The health status of human body can be reflected.Photoplethysmographic information (PPG information) can be used to obtain the heart rate and blood of human body
The information such as oxygen saturation, its principle are：After light beam enters human body from skin, it will be reflected in body fat layer and blood vessel
And reflection, the wherein absorption to light such as integumentary musculature, fat deposit keeps invariable in whole blood circulation, and volumetric blood
Change under key role in pulsation, periphery blood volume is more when the heart contracts, and absorbing amount is big, and the luminous intensity detected is most
It is small；And in diastole, the luminous intensity detected is big, therefore the luminous intensity that receives of optical receiver is in pulsating nature with volumetric blood
Change, converts optical signals into electric signal, can obtain the change of volume pulse blood, extract PPG information.
In the technology of existing collection human body PPG information, because optical signal can be by body fat layer attenuation by absorption, therefore all
It is that fat deposit more weak finger or wrist are acquired, in case the signal received is excessively weak.But weak to these fat
Position collection signal needs to use specific structure, and artificial pro-active intervention is realized.And many patients do not have in ill early stage, human body
Abnormal response, tend not to actively gather physiological signal, therefore delayed treatment time.
The content of the invention
The present invention provides a kind of signal projector and PPG information collecting devices, can be adopted with realizing in human body thickness fat sites
Collect PPG information so that people can gather PPG information in the state of unaware, find the exception of physiological characteristic early.
In a first aspect, the embodiment of the present invention provides a kind of signal projector, including drive module and light emitting devices, it is described
The output end of drive module connects the input of the light emitting devices；
The drive module is to the light emitting devices output current；The light emitting devices with default incident angle to
Human body skin launches optical signal, so that carrying PPG information is emitted from human body skin after the optical signal enters human vas, its
In, the optical signal is corresponding with the output current of the drive module, and the default incident angle is more than 13.8 ° and is less than
15.5°。
Second aspect, the embodiment of the present invention provide a kind of PPG information collecting devices, including signal projector and signal receive
Device；
The signal projector includes drive module and light emitting devices, and the output end of the drive module connects the light
The input of ballistic device；
The drive module is to the light emitting devices output current；The light emitting devices with default incident angle to
Human body skin launches optical signal, so that carrying PPG information is emitted from human body skin after the optical signal enters human vas, its
In, the optical signal is corresponding with the output current of the drive module, and the default incident angle is more than 13.8 ° and is less than
15.5°；
The signal receiver includes light receiving element and signal processing module, the output end connection of the light receiving element
The input of the signal processing module；
The light receiving element is disposed adjacent with the light emitting devices, receives the light letter from human body skin outgoing
Number, and the optical signal is converted into electric signal；The signal processing module receives and handles the electric signal, obtains the electricity
PPG information entrained by signal.
The embodiment of the present invention launches optical signal with the incident angle more than 13.8 ° and less than 15.5 ° to human body skin, passes through
Establish optical signal to find in the mode of fat sites and experiment, the incident angle of the scope can reduce body fat layer to light
The attenuation by absorption of signal so that PPG information gatherings can be carried out in human body thickness fat sites, solve prior art fatty weak
Position collection PPG information needs artificial the problem of actively execution can delay treatment time, realizes that people can be in the shape of unaware
PPG information is gathered under state, finds the abnormal effect of physiological characteristic early.
Brief description of the drawings
Fig. 1 is the structural representation for the signal projector that the embodiment of the present invention one provides；
Fig. 2 be in the embodiment of the present invention one optical signal in the schematic diagram of human body transmission；
Fig. 3 is the relation curve of light signal strength and incident angle in the embodiment of the present invention one；
Fig. 4 is the structural representation for the PPG information collecting devices that the embodiment of the present invention two provides.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Embodiment one
Fig. 1 is the structural representation for the signal projector that the embodiment of the present invention one provides.The signal projector includes driving
Module 11 and light emitting devices 12, the input of the output end connection light emitting devices 12 of drive module 11.
Drive module 11 is to the output current of light emitting devices 12；Light emitting devices 12 is with default incident angle to human body skin
Skin launches optical signal, so that the optical signal carries PPG information from human body skin outgoing after entering human vas, wherein, it is described
Optical signal is corresponding with the output current of drive module 11, and default incident angle is more than 13.8 ° and less than 15.5 °.
, should by being found based on mode and related experiment of the optical signal that physical optics theory is established in fat sites
The incident angle of scope can reduce attenuation by absorption of the body fat layer to optical signal, it is preferable that default incident angle is
14.63°.Specifically, referring to Fig. 2, Fig. 2 be in the embodiment of the present invention one optical signal human body transmission schematic diagram, optical signal warp
Cross air, skin, fat to finally enter in blood, because skin ectonexine medium difference can produce gradient refractive index, partly by people
Body attenuation by absorption, partly reflect at blood vessel, be then emitted with a shooting angle from human body skin.It is situated between using air as first
Matter, human body are second medium, then the equivalent refractive index ρ ' of second medium is relevant with the refractive index of fat deposit and blood vessel.Meanwhile enter
Firing angle degree determines transmission range of the optical signal in fat and blood vessel, therefore incident angle also influences the equivalent refraction of second medium
Rate ρ '.Inventor is theoretical using light transporting theory and light radiation, establishes mode of the optical signal in human body, obtains second medium
Equivalent refractive index ρ ' calculation formula：
Wherein, x is the incident angle that light emitting devices 12 launches optical signal,Y is that optical signal exists
Refractive index in fat deposit.According to above-mentioned formula, it can be calculated when x=14.63 °, the equivalent refractive index ρ ' of second medium
Minimum, then the light signal strength highest being emitted after being reflected at blood vessel.
Further derive its mathematic expectaion：As shown in Fig. 2 α1
And α2The optical signal that the solid angle for being respectively light emitting devices transmitting is ω is irradiated to skin and the interface edge of fat deposit is formed
Incidence angle (Plane Angle).Rectangular coordinate system is established, with n1And n2The optical signal refraction being illustrated respectively in skin and fat deposit
Rate, find corresponding relation：
On the basis of above-mentioned corresponding relation, it is strong to carry out emulation experiment acquisition optical signal as shown in Figure 3 using matlab
The relation curve of degree and incident angle.According to the result of emulation experiment, when between 13.8 ° to 15.5 ° of incident angle, emergent light
Signal intensity accounts for more than the 80% of maximum outgoing light signal strength.Therefore, default incident angle is more than 13.8 ° and is less than
15.5 ° can reduce attenuation by absorption of the body fat layer to optical signal so that PPG information gatherings can be in human body thickness fat sites
Carry out, and then can be by designing the structure without artificially actively can deliberately collect PPG information in various daily apparatus.
For instance, it is preferred that light emitting devices can launch optical signal by contacting human buttock to human body skin, you can by optical transmitting set
Part is on closestool.
The present embodiment also provides the output current amplitude range of preferable drive module, and this implementation is used with further raising
The precision for the signal projector collection PPG information that example provides.Specifically, current amplitude can not be excessive or too small, if electric current width
Be worth it is too small can cause be emitted optical signal it is excessively faint, it is difficult to identify；If amplitude is excessive, final signal distortion etc. may be caused
Situation.For human buttock, the principal element for optical signal of decaying is fat content.
Optical signal radiation strength calculation formula isWherein φeFor radiation flux, Ω is radiation solid angle.Root
Incoming signal radiation intensity U is obtained according to law of conservation of energye≈Uf+Uc, wherein UfFor reflected signal strength, UcTo be passed in fat deposit
The signal intensity of defeated absorption.Obviously, the impedance that optical signal transmits in airOptical signal is in bung fat
The impedance of layerWherein, F is electric current operator, is weighed under specific opto-electronic conversion ratio, and output current institute is right
Relation between the optical signal and Medium impedence answered.
Definition p is reflected voltage VReflected light signal(voltage corresponding to reflected light signal under specific photoelectricity conversion proportion) and enter radio
Press VIncident optical signalThe ratio of (voltage corresponding to incident optical signal under specific photoelectricity conversion proportion).Then VIncident optical signal=VReflected light signal+
VTransmit optical signal, IIncident optical signal=IReflected light signal+ITransmit optical signal, andBy
Above-mentioned incoming signal radiation intensity UeFormula and incident optical signal, transmitting optical signal and transmit optical signal between relation, enter
One step derives available：The formula illustrates that the attenuation degree of optical signal is relevant with fatty impedance.Believe in design
During number transmitter, according to the opto-electronic conversion parameter of signal projector drive module, it can be derived most useful for collection by the formula
In the state of PPG information, the functional relation between body fat layer impedance and required driving current amplitude.Prior art is generally adopted
By the use of AFE4400 integrated simulations front-end chip as the front-end chip of drive module, according to the functional relation and detectable human body
Bung fat layer impedance, can obtain the optimal output current of the drive module for using AFE4400 integrated simulation front-end chips for
8.3mA.Further, by experimental verification, when the output current of the drive module using AFE4400 integrated simulation front-end chips
When more than 7.5mA and being less than 9.5mA, outgoing light signal strength is 90% of maximum outgoing light signal strength under identical incident angle
More than.
On the basis of above-mentioned technical proposal, the signal projector is preferably two waveband transmitter.Satisfy in test blood oxygen
With the PPG information for needing to use two waveband when spending.
The technical scheme of the present embodiment, it is optimal obtained by the mode of fat sites and experiment to establish optical signal
Incident angle and drive module output current control outgoing light signal strength, reduce absorption of the body fat layer to optical signal and decline
Subtract so that PPG information gatherings can be carried out in human body thickness fat sites, solved prior art and gathered PPG in fatty weak part
Information needs artificial the problem of actively execution can delay treatment time, realizes that people can gather PPG in the state of unaware
Information, the abnormal effect of physiological characteristic is found early.
Embodiment two
Fig. 2 is the PPG information collecting devices that the embodiment of the present invention two provides.The PPG information collecting devices 30 include signal
Transmitter 10 and signal receiver 20；
Signal projector 10 includes drive module 11 and light emitting devices 12, and the output end of drive module connects the light hair
The input of emitter part.Drive module 11 is to the output current of light emitting devices 12；Light emitting devices 12 is with default incident angle
Launch optical signal to human body skin, so that carrying PPG information is emitted from human body skin after the optical signal enters human vas, its
In, the optical signal is corresponding with the output current of drive module 11, and the default incident angle is more than 13.8 ° and is less than
15.5°。
Signal receiver 20 includes light receiving element 21 and signal processing module 20, the output end connection of light receiving element 21
The input of signal processing module 22.Light receiving element 21 is disposed adjacent with light emitting devices 12, is received described from human body skin
The optical signal of outgoing, and the optical signal is converted into electric signal；Signal processing module 22 receives and handled the electric signal, obtains
Obtain the PPG information entrained by the electric signal.
In the specific implementation, processing of the signal processing module 22 to the electric signal includes filtering and amplification.Further,
Signal processing module includes 50Hz power frequency notch filters.Specifically, signal processing module 22 is first filtered out in the electric signal by environment
The noise brought, and to script amplitude, just very faint signal is amplified processing, is then write using built-in in microprocessor
50Hz power frequency Software notch devices filter out the Hz noise that human body is brought, and analog electrical signal is converted into digital electric signal.
Further, signal processing module 22 also includes communication module, and communication module is by the carrying PPG information after processing
Electric signal transmission, for care provider's preview and reference analysis, obtains the required physiological characteristic detected, such as heart to outside display terminal
Rate and blood oxygen saturation etc..
The technical scheme of the present embodiment, believed with the incident angle more than 13.8 ° and less than 15.5 ° to human body skin transmitting light
Number, found by establishing optical signal in the mode of fat sites and experiment, the incident angle of the scope can reduce people's body fat
Attenuation by absorption of the fat layer to optical signal so that PPG information gatherings can be carried out in human body thickness fat sites, solved prior art and existed
Fatty weak part collection PPG information needs artificial the problem of actively execution can delay treatment time, realizes that people can be in nothing
PPG information is gathered in the state of perception, finds the abnormal effect of physiological characteristic early.
It should be noted that in the case of not conflicting, those skilled in the art will can retouch in this specification
The different embodiments or example and the feature of different embodiments or example stated are combined and combined.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
- A kind of 1. signal projector, it is characterised in that including drive module and light emitting devices, the output end of the drive module Connect the input of the light emitting devices；The drive module is to the light emitting devices output current；The light emitting devices is with default incident angle to human body Skin launches optical signal, so that the optical signal carries PPG information from human body skin outgoing after entering human vas, wherein, institute The output current that optical signal is stated with the drive module is corresponding, and the default incident angle is more than 13.8 ° and is less than 15.5°。
- 2. signal projector as claimed in claim 1, it is characterised in that the default incident angle is 14.63 °.
- 3. signal projector as claimed in claim 1 or 2, it is characterised in that the light emitting devices is on closestool；It is described Light emitting devices launches optical signal by contacting human buttock to human body skin.
- 4. signal projector as claimed in claim 3, it is characterised in that the drive module includes AFE4400 integrated simulations Front-end chip.
- 5. signal projector as claimed in claim 4, it is characterised in that the output current of the drive module is more than 7.5mA And it is less than 9.5mA.
- 6. signal projector as claimed in claim 4, it is characterised in that the output current of the drive module is 8.3mA.
- 7. signal projector as claimed in claim 1 or 2, it is characterised in that the signal projector is two waveband transmitter.
- 8. a kind of PPG information collecting devices, it is characterised in that including signal projector and signal receiver；The signal projector includes drive module and light emitting devices, and the output end of the drive module connects the light transmitting The input of device；The drive module is to the light emitting devices output current；The light emitting devices is with default incident angle to human body Skin launches optical signal, so that the optical signal carries PPG information from human body skin outgoing after entering human vas, wherein, institute The output current that optical signal is stated with the drive module is corresponding, and the default incident angle is more than 13.8 ° and is less than 15.5°；The signal receiver includes light receiving element and signal processing module, described in the output end connection of the light receiving element The input of signal processing module；The light receiving element is disposed adjacent with the light emitting devices, receives the optical signal from human body skin outgoing, and The optical signal is converted into electric signal；The signal processing module receives and handles the electric signal, obtains the electric signal Entrained PPG information.
- 9. PPG information collecting devices as claimed in claim 8, it is characterised in that the signal processing module is to the telecommunications Number processing include filtering and amplification.
- 10. PPG information collecting devices as claimed in claim 9, it is characterised in that the signal processing module includes 50Hz works Frequency trapper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710818129.7A CN107468227B (en) | 2017-09-12 | 2017-09-12 | Signal transmitter and PPG information acquisition equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710818129.7A CN107468227B (en) | 2017-09-12 | 2017-09-12 | Signal transmitter and PPG information acquisition equipment |
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| Publication Number | Publication Date |
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| CN107468227A true CN107468227A (en) | 2017-12-15 |
| CN107468227B CN107468227B (en) | 2020-10-16 |
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| CN201710818129.7A Active CN107468227B (en) | 2017-09-12 | 2017-09-12 | Signal transmitter and PPG information acquisition equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108814566A (en) * | 2018-04-04 | 2018-11-16 | 太原理工大学 | Intelligent portable human body condition sensor |
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| CN107468227B (en) | 2020-10-16 |
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Inventor after: Chen Xiaohui Inventor after: Wang Youran Inventor after: Sun Bin Inventor after: Wang Pei Inventor before: Wang Pei Inventor before: Chen Xiaohui Inventor before: Wang Youran Inventor before: Sun Bin Inventor before: Lv Yashuai |
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