KR20170010713A - Method, device and non-transitory computer-readable recording medium for measuring photoplethysmography signal - Google Patents

Method, device and non-transitory computer-readable recording medium for measuring photoplethysmography signal Download PDF

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Publication number
KR20170010713A
KR20170010713A KR1020160023600A KR20160023600A KR20170010713A KR 20170010713 A KR20170010713 A KR 20170010713A KR 1020160023600 A KR1020160023600 A KR 1020160023600A KR 20160023600 A KR20160023600 A KR 20160023600A KR 20170010713 A KR20170010713 A KR 20170010713A
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South Korea
Prior art keywords
light
wavelength range
illuminance
pulse wave
wave signal
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KR1020160023600A
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Korean (ko)
Inventor
신민용
최윤철
유흥종
신성준
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주식회사 휴이노
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Priority to US15/215,178 priority Critical patent/US20170020421A1/en
Priority to PCT/KR2016/007893 priority patent/WO2017014550A1/en
Publication of KR20170010713A publication Critical patent/KR20170010713A/en

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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
    • A61B5/145—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
    • A61B5/14552—Details of sensors specially adapted therefor
    • 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
    • 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

Abstract

According to the present invention, provided are a method and a device for measuring a photoplethysmographic signal and a non-transitory computer-readable recording medium. According to the present invention, an accurate photoplethysmographic signal can be obtained even in an environment having surrounding light of non-uniform brightness due to an external light source, and accuracy in various types of biological information drawn from the photoplethysmographic signal can be increased.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method, an apparatus, and a non-transitory computer readable recording medium for measuring a photoelectrically-pulsating pulse wave signal,

The present invention relates to a method, apparatus and non-transitory computer readable recording medium for measuring a photoelectrically-pulsating pulse signal.

Recently, the rapid development of science and technology has improved the quality of life of the whole human being, and many changes have occurred in the medical environment. In the past, medical images such as X-ray, CT, and fMRI were taken in the hospital, and it was possible to read the images only after several hours or several days.

However, after 10 years of medical imaging, a Picture Archive Communication System (PACS) has been introduced, which allows images to be transmitted to a monitor screen of a radiologist and then read out immediately. In addition, many ubiquitous healthcare-related medical devices that can confirm their blood sugar and blood pressure at any time without going to a hospital are widely used, and blood glucose patients or hypertensive patients use them in their own homes or offices. In particular, in the case of hypertension, which is the main cause of the invention of various diseases and the prevalence is increasing, a system for continuously measuring blood pressure and informing it in real time is needed, and various types of studies related thereto have been tried.

On the other hand, biometric information such as electrocardiogram, heart rate, body temperature information, oxygen saturation in blood, electromyogram, sweat gland activity, foot volume, respiratory rate, etc., as well as blood pressure, are obtained from two or more contact points (not necessarily physically attached) It is required to provide a technique capable of appropriately processing and measuring a living body signal obtained from various points of the human body in order to obtain the living body information.

In particular, PhotoPlethysmoGraphy (PPG) signals are used to measure various biological information related to cardiac function, including oxygen saturation (SpO 2 ) in the blood. According to the conventional optoelectronic pulse wave signal measuring technique, there is a technical restriction that a shielding structure is indispensably required in order to prevent an error caused by an external light source.

Hereinafter, the case of calculating the oxygen saturation in the blood using the optoelectronic pulse wave signal will be described in more detail as an example.

BACKGROUND ART [0002] A conventional technique for measuring oxygen saturation (SpO 2 ) in blood using a photoelectric pulse wave signal is a technique for detecting visible light (for example, red light, green light, etc.) and infrared light reflected from a human body, A technique of calculating the oxygen saturation based on the optoelectronic pulse wave signal according to each of visible light and infrared light has been introduced. In this conventional technique, the light absorption rate by oxygen hemoglobin (HbO 2 ) And that it appears higher in the infrared light than in the infrared light.

1 is an exemplary diagram illustrating an environment in which oxygen saturation is measured according to the prior art. 1, in the conventional light receiving unit 110 of the photoelectrical pulse wave signal measuring apparatus, not only the light irradiated to the user's body by the light emitting unit (not shown) and reflected from the user's body 120, Since the intensity or brightness of the ambient light emitted from the external light source 130 may vary depending on the measurement environment, There is a technical problem that it is not easy to keep the amount (intensity or brightness) of light received by the light receiving unit 110 constant.

In order to accurately measure the optoelectronic pulse wave signal (and furthermore, the degree of oxygen saturation), the brightness (i.e., illuminance) of the light sensed by the light receiving unit 110 needs to be kept constant. In order to achieve the above- A shielding structure is used to shield the light-irradiated and sensed portions from external light sources. As a result, according to the related art, there is a spatial restriction to include all the components such as the light emitting portion for emitting light and the light receiving portion for sensing light in the shielding structure, and the size of the measuring device becomes excessively large due to the shielding structure Problems also arise.

Thus, the present inventors propose a technique that can accurately measure the photoelectric pulse wave signal (and furthermore, oxygen saturation) in an environment in which the brightness of ambient light is not constant due to an external light source.

It is an object of the present invention to solve all the problems described above.

Further, the present invention is characterized in that the light of the first wavelength range and the light of the second wavelength range are irradiated to the user's body through the first filter section and the second filter section, respectively, and through each of the first filter section and the second filter section The light of the first wavelength range and the light of the second wavelength range which are incident through the first filter portion and the second filter portion, respectively, And a second photoelectric pulse wave signal corresponding to the light of the second wavelength range detected above and the first photoelectric pulse wave signal corresponding to the light of the first wavelength range detected above, The light of the first wavelength range irradiated to the user's body and the light of the second wavelength range irradiated to the user's body are measured so that the difference between at least one of the first illuminance and the second illuminance measured above and the predetermined reference illuminance is less than a predetermined level, At least one of the light in the wavelength range It is another object of the present invention to provide a method, apparatus, and non-transitory computer readable recording medium capable of accurately measuring a photoelectric pulse wave signal in an environment in which the brightness of ambient light is not constant due to an external light source.

In order to accomplish the above object, a representative structure of the present invention is as follows.

According to one aspect of the present invention, there is provided a method for measuring a PPG signal, comprising the steps of: irradiating light in a first wavelength range and light in a second wavelength range through a first filter section and a second filter section, Wherein the first filter unit and the second filter unit respectively detect light in a first wavelength range and light in a second wavelength range that are incident through the first filter unit and the second filter unit, Measuring a first illuminance and a second illuminance, respectively, the illuminance of each of the light of the first wavelength range and the light of the second wavelength range incident through each of the first wavelength ranges and the first illuminance and the second illuminance, And generating a second optoelectronic pulse wave signal corresponding to the detected light in the second wavelength range, wherein in the step of irradiating, at least one of the measured first illuminance and the second illuminance, Set baseline It is less than a predetermined level difference between, a method for adjusting at least one of the brightness of the first light and the second wavelength range of the wavelength range of light to be irradiated with respect to the body of the user is provided.

According to another aspect of the present invention, there is provided an apparatus for measuring a PPG signal, the apparatus comprising: a light source for emitting light in a first wavelength range and light in a second wavelength range through a first filter unit and a second filter unit, A first light receiving portion for detecting light in a first wavelength range and light in a second wavelength range incident through the first filter portion and the second filter portion, respectively, And a second illuminance measuring unit for measuring a first illuminance and a second illuminance, respectively, which are the illuminance of the light in the first wavelength range and the light in the second wavelength range incident through the second light receiving unit, the first filter unit and the second filter unit, A first illuminance sensor, a second illuminance sensor, a first photoelectric pulse wave signal according to the light of the first wavelength range to be sensed, and a second photoelectric pulse wave signal corresponding to the light of the second wavelength range to be sensed, And a second illuminance measurement step A controller for adjusting the brightness of at least one of the light in the first wavelength range and the light in the second wavelength range irradiated to the human body of the user so that a difference between at least one of the degrees and the preset reference illuminance is less than a predetermined level, Is provided.

In addition, there is provided another non-transitory computer readable recording medium for recording a computer program for carrying out the method and apparatus for implementing the invention.

According to the present invention, it is possible to accurately measure the optoelectronic pulse wave signal even in an environment where the brightness of the ambient light is not constant due to the external light source.

According to the present invention, it is possible to enhance the accuracy of various biometric information that can be derived from the optoelectronic pulse wave signal.

Further, according to the present invention, by adopting a configuration in which the brightness of light irradiated to the human body is adaptively adjusted, spatial restriction can be prevented from occurring due to the conventional shielding structure, and furthermore, It is possible to easily mount the optoelectronic pulse wave signal measuring device even in a wearable device having a restriction.

1 is a diagram illustrating an exemplary environment in which a photoelectric pulse wave signal is measured according to a conventional technique.
2 is a diagram schematically showing a configuration of an overall system according to an embodiment of the present invention.
3 is a diagram illustrating an internal configuration of an optoelectronic pulse wave signal measuring apparatus according to an embodiment of the present invention.
FIG. 4 is an exemplary illustration of an apparatus for measuring a pulsatile pulse wave signal according to an embodiment of the present invention. FIG.
5 is a diagram illustrating a process of measuring a photoelectrically-converting pulse wave signal and oxygen saturation according to an embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

Configuration of the entire system

The overall system for measuring the optoelectronic pulse wave signal according to an embodiment of the present invention will be described in detail as follows.

2 is a diagram schematically showing a configuration of an overall system according to an embodiment of the present invention.

2, the overall system according to an exemplary embodiment of the present invention may include a communication network 100, a photoelectric pulse wave signal measurement apparatus 200, and a device 300. [

The communication network 100 according to an exemplary embodiment of the present invention may be configured without regard to communication modes such as wired communication and wireless communication. The communication network 100 may be a local area network (LAN), a metropolitan area network ), A wide area network (WAN), and the like. Preferably, the communication network 100 referred to herein includes well-known short range wireless communication networks such as Wi-Fi, Wi-Fi Direct, LTE Direct, Bluetooth, . However, the communication network 100 may include, at least in part, a known wire / wireless data communication network, a known telephone network, or a known wire / wireless television communication network, without being limited thereto.

Next, an optoelectronic pulse wave signal measuring apparatus 200 according to an embodiment of the present invention includes a first filter unit 241 and a second filter unit (not shown) for converting light in the first wavelength range and light in the second wavelength range 242 to detect light in the first wavelength range and light in the second wavelength range incident through the first filter unit 241 and the second filter unit 242, respectively, The first illuminance and the second illuminance, which are the illuminance of the light in the first wavelength range and the light in the second wavelength range incident through the first filter portion 241 and the second filter portion 242, respectively, A second photoelectric pulse wave signal corresponding to light in a second wavelength range sensed by the first photoelectric pulse wave signal and a second photoelectric pulse wave signal corresponding to the light in the first wavelength range, So that the difference between at least one of the illuminations and the preset reference illuminance is less than a predetermined level, By adjusting the brightness of at least one of the light in the first wavelength range and the light in the second wavelength range which are irradiated to the human body, it is possible to accurately measure the optoelectronic pulse wave signal and the oxygen saturation in an environment in which the brightness of the ambient light is not constant due to the external light source And performs a function that can be performed.

The function of the optoelectronic pulse wave signal measuring apparatus 200 will be described in more detail below. Although the above description has been made with respect to the optoelectronic pulse wave signal measuring apparatus 200, the description is for illustrative purposes only, and at least a part of the functions or components required for the optoelectronic pulse wave signal measuring apparatus 200 is not limited to the device It is apparent to those skilled in the art that it may be realized within device 300 or included within device 300.

Finally, the device 300 according to an embodiment of the present invention is a digital device including a function of communicating after it is connected to the opto-electronic pulse-wave-signal-measuring device 200. The device 300 includes memory means, Any number of digital devices having computing ability can be adopted as the device 300 according to the present invention. The device 300 may be a wearable device such as a smart glass, a smart watch, a smart band, a smart ring, a smart necklace, etc., or a smart phone, a smart pad, a desktop computer, a notebook computer, a workstation, a PDA, May be a somewhat more traditional device. According to one embodiment of the present invention, the device 300 may include sensing means for acquiring a bio-signal from a human body, and may include display means for providing bio-information to the user.

Also, according to an embodiment of the present invention, the device 300 may further include an application program for performing the functions according to the present invention. Such applications may reside in the device 300 in the form of program modules. The characteristics of such a program module may be generally similar to the calculation unit 250, the communication unit 260, and the control unit 270 of the optoelectronic pulse wave signal measuring apparatus 200 as described below. Here, the application may be replaced with a hardware device or a firmware device, at least some of which can perform substantially the same or equivalent functions as necessary.

Configuration of photoelectric pulse wave signal measurement device

Hereinafter, the internal configuration of the optoelectronic pulse wave signal measuring apparatus 200, which performs an important function for the realization of the present invention, and the functions of the respective components will be described.

3 is a diagram illustrating an internal configuration of an optoelectronic pulse wave signal measuring apparatus according to an embodiment of the present invention.

3, an optoelectronic pulse wave signal measuring apparatus 200 according to an exemplary embodiment of the present invention includes a light emitting unit 210, a light receiving unit 220, an illuminance sensor unit 230, a filter unit 240, (250), a communication unit (260), and a control unit (270). According to an embodiment of the present invention, the calculator 250, the communication unit 260 and the control unit 270 may be program modules in which at least a part of them communicate with an external system (not shown). These program modules may be included in the optoelectronic pulse wave signal measuring apparatus 200 in the form of an operating system, an application program module, and other program modules, and may be physically stored on various known memory devices. These program modules may also be stored in a remote storage device capable of communicating with the optoelectronic pulse wave signal measuring device 200. [ These program modules include, but are not limited to, routines, subroutines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types as described below in accordance with the present invention.

FIG. 4 is a diagram illustrating an example of a photoelectric pulse wave signal measuring apparatus according to an embodiment of the present invention.

First, according to an embodiment of the present invention, the light emitting unit 210 may be configured to emit light in a first wavelength range and light in a second wavelength range to a human body (e.g., a finger, a wrist, etc.) And the like. Specifically, the light emitting unit 210 according to an embodiment of the present invention includes a first light emitting unit 211 and a second light emitting unit 212 that emit light in the first wavelength range and light in the second wavelength range, respectively, And a light emitting diode (LED) capable of generating light in the first wavelength range or light in the second wavelength range according to a predetermined period. For example, light in the first wavelength range may include visible light in the wavelength range of 490 nm to 780 nm, and light in the second wavelength range may include infrared light in the wavelength range of 800 nm to 980 nm .

According to an embodiment of the present invention, the light in the first wavelength range and the light in the second wavelength range, which are emitted from the light emitting unit 210, are respectively transmitted through the first filter unit 241 and the second filter unit 242 The first filter unit 241 and the second filter unit 242 may be made of a filter that selectively transmits light in the first wavelength range and light in the second wavelength range, .

As described later, according to an embodiment of the present invention, the brightness of the light in the first wavelength range or the light in the second wavelength range irradiated to the user's body is determined by the brightness of the first The illuminance or the second illuminance may be adjusted in such a direction as to match the predetermined reference illuminance. That is, according to an embodiment of the present invention, the light of the first wavelength range irradiated to the human body of the user is adjusted so that the difference between at least one of the first illuminance and the second illuminance and the preset reference illuminance is less than a predetermined level And the brightness of at least one of the light in the second wavelength range can be adaptively adjusted.

For example, when the first illuminance measured by the first illuminance sensor unit 231 is lower than the predetermined reference illuminance, the first illuminance is determined by the first illuminance unit 211 The brightness of the light of the first wavelength range to be irradiated can be increased. Alternatively, when the second illuminance measured by the second illuminance sensor section 232 is higher than the predetermined reference illuminance, the second illuminance section 212 may be provided so that the second illuminance may match the predetermined reference illuminance. It is possible to reduce the brightness of light in the second wavelength range to be irradiated. According to an embodiment of the present invention, the function of adjusting the brightness of the light of the first wavelength range or the light of the second wavelength range may be performed by the controller 270.

Next, according to an embodiment of the present invention, the light receiving unit 220 may perform a function of detecting light in the first wavelength range and light in the second wavelength range, respectively. More specifically, the light-receiving unit 220 according to an embodiment of the present invention includes a first light-receiving unit 221 and a second light-receiving unit 222 that respectively detect light in the first wavelength range and light in the second wavelength range And a photodiode capable of sensing light in the first wavelength range or light in the second wavelength range. According to an embodiment of the present invention, the light sensed by the light receiving unit 220 may include not only light irradiated by the light emitting unit 210 but reflected from the user's body, but also ambient light irradiated from an external light source .

According to an embodiment of the present invention, light in the first wavelength range and light in the second wavelength range, which are sensed by the light receiving unit 220, are transmitted through the first filter unit 241 and the second filter unit 242, respectively As described above, the first filter unit 241 and the second filter unit 242 are made of filters that selectively transmit light in the first wavelength range and light in the second wavelength range, respectively. .

Next, in accordance with an embodiment of the present invention, the illuminance sensor unit 230 may include a first wavelength range light and a second wavelength range that are incident through the first filter unit 241 and the second filter unit 242, respectively, The first illuminance and the second illuminance, which are the illuminance of each of the lights of the first and second illuminants, respectively. In detail, the illuminance sensor unit 230 according to an embodiment of the present invention includes a first illuminance sensor unit 231 and a second illuminance sensor unit 232 that respectively detect the first illuminance and the second illuminance And the first illuminance sensor unit 231 and the second illuminance sensor unit 232 may be disposed around the first light receiving unit 221 and the second light receiving unit 222, respectively.

Next, in accordance with an embodiment of the present invention, the calculation unit 250 generates a first photoelectric pulse wave signal according to light in the first wavelength range and a second photoelectric pulse wave signal according to light in the second wavelength range Function can be performed.

More specifically, the calculating unit 230 according to an embodiment of the present invention calculates the first wavelength? 1 generated by the first light emitting unit 211 or the second light emitting unit 212 by the control unit 270, As the brightness of the range of light or the light of the second wavelength range is adaptively adjusted, the first illuminance or the second illuminance is preset such that the difference between the first illuminance or the second illuminance and the predetermined reference illuminance is less than a predetermined level The first photoelectric pulse wave signal or the second photoelectric pulse wave signal in accordance with the light of the first wavelength range or the light of the second wavelength range respectively sensed by the first light receiving section 221 or the second light receiving section 222, Thereby generating a photoelectric pulse wave signal, respectively.

In addition, the calculation unit 230 according to an embodiment of the present invention may be configured such that, when the first illuminance or the second illuminance exceeds a preset reference illuminance, the relative illuminance between the first illuminance or the second illuminance and the predetermined reference illuminance The intensity of the first photoelectric pulse wave signal or the second photoelectric pulse wave signal can be corrected (scaled) with reference to the ratio. For example, when the first illuminance measured by the first illuminance sensor unit 231 is 2000 lux and the predetermined reference illuminance is 1000 lux, the light of the first wavelength range detected by the first light receiving unit 221 The intensity of the first photoelectric pulse wave signal can be scaled by a factor of 1/2.

Therefore, according to the present invention, it is possible to accurately measure the optoelectronic pulse wave signal in an environment in which the brightness of the ambient light is not constant due to the external light source, without employing the conventional shielding structure causing spatial limitation .

Meanwhile, according to an embodiment of the present invention, the calculating unit 250 calculates the oxygen saturation in the blood of the user's body with reference to the first photoelectric pulse wave signal and the second photoelectric pulse wave signal generated as described above Function can be performed.

Specifically, the calculating unit 250 according to an exemplary embodiment of the present invention can easily calculate the oxygen saturation based on a typical oxygen saturation calculating model that can be applied when the illuminance of sensed light matches a preset reference illuminance Can be calculated. As described above, the brightness of the light emitted from the light emitting unit 210 is adaptively controlled or the photoelectric pulse wave signal generated from the light sensed by the light receiving unit 220 is adaptively corrected, Since the pulse wave signal and the second photoelectric pulse wave signal can be directly applied to the conventional oxygen saturation calculation model described above, the calculation unit 230 according to the embodiment of the present invention calculates the first photoelectric pulse wave signal And oxygen saturation can be calculated with reference to the second photoelectronic pulse wave signal and the conventional oxygen saturation calculation model.

For example, the oxygen saturation computation model according to an embodiment of the present invention may include a first photoelectric pulse wave signal (i.e., a signal based on red light) and a second photoelectric pulse wave signal (i.e., And a signal based on the oxygen concentration of the hemoglobin in the blood). However, it should be noted that the oxygen saturation calculation model according to the present invention is not necessarily limited to those listed above, but may be modified within the scope of achieving the object of the present invention.

5 is a diagram illustrating a process of measuring a photoelectrically-converting pulse wave signal and oxygen saturation according to an embodiment of the present invention.

5, the first light emitting unit 211 and the second light emitting unit 212 emit red light in a first wavelength range and infrared light (IR) in a second wavelength range, respectively, according to an embodiment of the present invention. The first light receiving section 221 and the second light receiving section 222 may emit the red light of the first wavelength range reflected from the user's body or irradiated from the external light source, Infrared light in the second wavelength range can be detected, respectively.

5, the first illuminance sensor unit 231 and the second illuminance sensor unit 232 according to an embodiment of the present invention may include a first light receiving unit 221 and a second light receiving unit 222, The illuminance of the red light in the first wavelength range and the illuminance of the infrared light in the second wavelength range can be measured.

5, the calculator 250 may calculate a first photoelectric pulse wave signal corresponding to the light in the first wavelength range sensed above and a second photoelectric pulse wave signal corresponding to the second sensed wavelength It is possible to generate the second opto-electronic pulse wave signal according to the light in the range. In addition, the calculating unit 250 according to an embodiment of the present invention can calculate the oxygen saturation in the blood of the user with reference to the first photoelectric pulse wave signal and the second photoelectric pulse wave signal generated as described above .

5, a controller 270 according to an exemplary embodiment of the present invention includes a controller 260 for controlling the first illuminance sensor unit 231 or the second illuminance sensor unit 232, The red light in the first wavelength range generated in the first light emitting portion 211 or the second light emitting portion 212 in the direction that the light intensity or the illuminance of the infrared light in the second wavelength range coincides with the preset reference illuminance, The brightness (intensity) of the infrared light in the second wavelength range can be adaptively adjusted.

Next, the communication unit 260 according to the embodiment of the present invention performs a function of allowing the opto-electronic pulse-wave signal measuring apparatus 200 to communicate with an external device.

The control unit 270 includes a light emitting unit 210, a light receiving unit 220, an illuminance sensor unit 230, a filter unit 240, a calculating unit 250, and a communication unit 260. [ To control the flow of data. That is, the control unit 270 controls the flow of data between the components of the external and / or optoelectronic pulse-wave signal measuring apparatus 200 to control the light-emitting unit 210, the light-receiving unit 220, the illuminance sensor unit 230, The filter unit 240, the calculation unit 250, and the communication unit 260, respectively.

The embodiments of the present invention described above can be implemented in the form of program instructions that can be executed through various computer components and recorded in a non-transitory computer readable recording medium. The non-transitory computer readable medium may include program instructions, data files, data structures, etc., either alone or in combination. The program instructions recorded on the non-transitory computer-readable recording medium may be those specially designed and constructed for the present invention or may be those known to those skilled in the computer software arts. Examples of non-transitory computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs, DVDs, magneto-optical media such as floppy disks magneto-optical media), and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules for performing the processing according to the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

100: Network
200: Photoelectric pulse wave signal measuring device
210:
220:
230: illuminance sensor unit
240:
250:
260:
270:
300: device

Claims (13)

CLAIMS What is claimed is: 1. A method for measuring a photoelectrical pulse wave (PPG)
Irradiating light of the first wavelength range and light of the second wavelength range to the user's body through the first filter section and the second filter section respectively,
Wherein the first filter unit and the second filter unit respectively detect the light in the first wavelength range and the light in the second wavelength range, Measuring a first illuminance and a second illuminance, respectively, the illuminance of each of the light in the first wavelength range and the light in the second wavelength range, and
Generating a first photoelectric pulse wave signal according to the light of the first wavelength range to be sensed and a second photoelectric pulse wave signal corresponding to the light of the second wavelength range to be sensed
Lt; / RTI >
In the irradiation step,
The light of the first wavelength range and the light of the second wavelength range irradiated to the human body of the user so that the difference between at least one of the measured first illuminance and the second illuminance and the predetermined reference illuminance is less than a predetermined level, / RTI > wherein the brightness of at least one of the plurality of pixels is adjusted. The method according to claim 1,
In the irradiation step,
At least one of the light in the first wavelength range and the light in the second wavelength range irradiated to the human body of the user is measured in a case where at least one of the measured first illuminance and second illuminance is less than the preset reference illuminance How to increase. The method according to claim 1,
In the generating step,
Wherein at least one of the measured first illuminance and the second illuminance exceeds a predetermined reference illuminance, a reference ratio between at least one of the first illuminance and the second illuminance to be measured and the predetermined reference illuminance is referred to Thereby correcting at least one intensity of the first photoelectric pulse wave signal and the second photoelectric pulse wave signal. The method according to claim 1,
Calculating oxygen saturation in blood of the user's body with reference to the first photoelectric pulse wave signal and the second photoelectric pulse wave signal,
≪ / RTI > The method according to claim 1,
Wherein the first filter portion and the second filter portion selectively transmit light in the first wavelength range and light in the second wavelength range, respectively. The method according to claim 1,
Wherein the first wavelength range includes a wavelength range of 490 nm to 780 nm and the second wavelength range includes a wavelength range of 800 nm to 980 nm. A non-transitory computer readable recording medium having recorded thereon a computer program for carrying out the method according to claim 1. An apparatus for measuring a photoelectrical pulse wave (PPG) signal,
A first light emitting portion and a second light emitting portion for irradiating the light of the first wavelength range and the light of the second wavelength range to the user's body through the first filter portion and the second filter portion,
A first light receiving unit and a second light receiving unit that respectively detect light in a first wavelength range and light in a second wavelength range that are incident through the first filter unit and the second filter unit,
A first illuminance sensor for measuring a first illuminance and a second illuminance, respectively, which are illuminances of light in a first wavelength range and light in a second wavelength range which are incident through the first filter portion and the second filter portion, respectively; 2 illuminance sensor,
A calculation unit for generating a first photoelectric pulse wave signal corresponding to the light of the first wavelength range to be sensed and a second photoelectric pulse wave signal corresponding to the light of the second wavelength range to be sensed,
The light of the first wavelength range and the light of the second wavelength range irradiated to the human body of the user so that the difference between at least one of the measured first illuminance and the second illuminance and the predetermined reference illuminance is less than a predetermined level, And a control unit
/ RTI > 9. The method of claim 8,
Wherein the controller is configured to control the light of the first wavelength range and the light of the second wavelength range that are irradiated to the user's body in the case where at least one of the measured first illuminance and the second illuminance is less than the preset reference illuminance A device that increases one brightness. 9. The method of claim 8,
The calculating unit may calculate a relative illuminance between at least one of the measured first illuminance and the second illuminance and the predetermined reference illuminance when at least one of the measured first illuminance and the second illuminance exceeds the predetermined reference illuminance And corrects the intensity of at least one of the first photoelectric pulse wave signal and the second photoelectric pulse wave signal with reference to the ratio. 9. The method of claim 8,
Wherein the calculating unit calculates an oxygen saturation degree in the blood of the human body of the user with reference to the first photoelectric pulse wave signal and the second photoelectric pulse wave signal. 9. The method of claim 8,
Wherein the first filter portion and the second filter portion selectively transmit light in the first wavelength range and light in the second wavelength range, respectively. 9. The method of claim 8,
Wherein the first wavelength range includes a wavelength range of 490 nm to 780 nm and the second wavelength range includes a wavelength range of 800 nm to 980 nm.
KR1020160023600A 2015-07-20 2016-02-26 Method, device and non-transitory computer-readable recording medium for measuring photoplethysmography signal KR20170010713A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021177797A1 (en) * 2020-03-05 2021-09-10 서울대학교병원 Method, system, and non-transitory computer-readable recording medium for providing information about post-cardiac arrest prognosis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021177797A1 (en) * 2020-03-05 2021-09-10 서울대학교병원 Method, system, and non-transitory computer-readable recording medium for providing information about post-cardiac arrest prognosis

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