WO2017171228A1 - System for measuring bio-signal including arrhythmia using smart scale - Google Patents

Abstract

The present invention relates to a system for measuring a bio-signal including arrhythmia using a smart scale that is capable of measuring bio-information such as PPG, ECG, and arrhythmia of a user who steps on the scale that uses a metal electrode and a camera for photographing the soles of feet.

Description

Biosignal measurement system including arrhythmia using smart scale

The present invention relates to a biosignal measuring system including an arrhythmia using a smart weight scale capable of measuring biometric information such as PPG, ECG, and arrhythmia of a user on a scale using a camera photographing the sole and a metal electrode.

Recently, with increasing interest in healthcare, many techniques for checking the state of health by measuring biological signals have been studied. Among many biological signals, photoplethysmography (PPG) is a signal that can simply monitor a biological signal and measures the change in blood volume in blood vessels according to the heartbeat using absorption, reflection, and scattering of light. In the field of medical measurement, it is used to measure the level of oxygen saturation in blood by analyzing PPG signal. PPG is used to measure the oxygen saturation of arterial blood, and pulses can be calculated by measuring the peaks per minute of the PPG signal.

To date, studies have been proposed by various researchers on the unrestricted detection of heart rate and respiratory signals using reflective PPG sensors. In the improvement of accuracy using dynamic noise in respiratory rate measurement using PPG, a PPG sensor is attached to the back of the neck of a subject lying on an air pillow to continuously monitor vital signals without causing inconvenience during sleep. Extracted.

PPG signals are typically measured on translucent fingers or toes using a transmissive PPG sensor. These sensors must measure the signal from the fingers or toes, so it is difficult to measure the correct signal when the fingers or toes are moved.

It is an object of the present invention to provide a biosignal measuring system including an arrhythmia using a smart weight scale that can measure biometric information such as PPG, ECG and arrhythmia of a user on a scale using a camera photographing the sole and a metal electrode. There is.

It is another object of the present invention to provide a biosignal measurement system including a cardiac arrhythmia using a weight scale capable of diagnosing arrhythmia using a PPG signal, a metal electrode, and ECG measurement on a foot image of a user photographed by a camera. have.

Bio-signal measurement system including arrhythmia using a smart body weight scale according to the present invention, the foot scale 10 is formed with a footrest 11 on which the foot is placed; It consists of a terminal 20 for receiving the weight information measured by the scale 10 while communicating with the scale 10,

The scale 10 includes a camera 12 which photographs the sole of the foot placed on the footrest 11 of the scale 10; A light source 13 which emits light toward the upper part where the sole is located at the lower part of the footrest 11 of the body scale 10; A metal electrode 14 positioned on the footrest 11 of the weight scale 10 and measuring an electrode signal on the bottom of the foot scale; The control signal of the photographing operation unit is provided from the terminal 20, and the weight information measured by the scale 10, the image information photographed by the camera 12, and the biological information measured by the metal electrode 14 are transferred to the terminal 20. It includes a communication unit 16 for providing,

The terminal 20 includes: a scale controller 21 for providing an on / off control signal to the operation unit 15 of the scale 10; An image management unit 22 which receives the sole image captured by the camera 12 of the scale 10 in real time; A PPG signal confirming unit 23 for analyzing a plantar image captured by the camera 12 in real time to confirm a PPG (photolethysmoraphy) signal; An RRI calculation unit 24 for calculating an RRI representing a time interval between R peaks from the PPG signal of the sole confirmed through the PPG signal confirmation unit 23; An ECG checking unit 25 for checking the ECG measured from the metal electrode 14 of the scale; A feature point extractor 26 for extracting feature points for arrhythmia classification using the RRI signal of the RRI calculator 24 and the ECG identified by the ECG checker 25; Arrhythmia check unit 27 for determining arrhythmia using the feature points extracted from the feature point extractor 26; It characterized in that it comprises a display unit 28 for displaying so that the user can confirm the identification information on the RRI, ECG, arrhythmia measured on the scale.

Preferably, the scale 10 further includes an operation unit 15 for controlling the on / off of the camera 12, the light source 13, and the metal electrode 14.

Preferably, the metal electrode 14 is positioned on the heel portion of the left leg LL and the right leg LL.

Preferably, the PPG signal confirming unit 23 is a convex part of the lower part of the big toe, 17 parts of the index finger toe of the convex part of the lower part of the little toe, or 20 parts of the concave part of the lower part of 17 parts The PPG signal is checked in any one of the images.

Preferably, the ECG checking unit 25 passes the signal provided from the metal electrode 14 through the high pass filter, inputs it to the ECG measuring IC through the signal buffer, and checks the ECG. The noise component is removed and the peak component is extracted.

The biosignal measuring system including the arrhythmia using the smart weight scale of the present invention checks the PPG signal on the sole image of the user captured by the camera, checks the ECG with a metal electrode, and can use it to diagnose bioinformation such as arrhythmia. It has an effect.

1 is a schematic diagram of a biosignal measuring system including arrhythmia using a smart scale according to the present invention.

2 is a block diagram of a scale according to the present invention.

3 is a block diagram of a terminal according to the present invention;

Figure 4 is an illustration of the index of each part of the sole according to the present invention.

5a to 5d is a Bland-Altman Plot for each fingertip and sole of the foot according to the present invention.

Figure 6 is a graph of the ECG signal measured on a scale using a metal electrode.

Hereinafter, with reference to the accompanying drawings looks at in detail with respect to the bio-signal measurement system including arrhythmia using a smart weight scale according to the present invention.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments of the present invention make the disclosure of the present invention complete and the general knowledge in the technical field to which the present invention belongs. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

As shown in FIG. 1, a biosignal measuring system including arrhythmia using a smart scale according to an exemplary embodiment of the present invention includes a scale 10 for measuring a user's weight by forming a footrest 11 on which a foot rests. ; The terminal 20 is configured to receive weight information measured by the scale 10 while communicating with the scale 10. At this time, the footrest 11 of the scale 10 is preferably made of a transparent material such as glass. Alternatively, the terminal 20 is preferably formed integrally with the scale 10 or a wireless terminal such as a smartphone. Since the weight of the scale 10 is measured in the same way as the general scale 10 using a load cell, the description thereof will be omitted.

As shown in FIG. 2, the scale 10 includes a camera 12, a light source 13, a metal electrode 14, an operation unit 15, and a communication unit 16.

The sole photographing unit 12 photographs the sole of the user placed on the footrest 11 of the scale 10 using a camera for a predetermined time. Such a camera 12 is preferably located at the bottom of the footrest (11). The camera preferably shoots at 30 frames per second. On one side of the camera 12 is located a light source 13 for the light source so as to clearly photograph the sole. At this time, the light source 13 preferably uses infrared rays, it is preferable that the light source toward the upper portion where the sole is located in the lower portion of the footrest 11 of the scale 10.

The metal electrode 14 is located on the footrest 11 of the weight scale 10 and measures the electrode signal on the sole. In this case, the metal electrode 14 is preferably located at the heel portion of the left leg LL and the right leg LL.

The operation unit 15 controls on / off of the camera 12, the light source 13, and the metal electrode 14. At this time, it is preferable that the operation unit 15 controls the operation while wirelessly communicating with the camera 12, the light source 13, and the metal electrode 14.

The communication unit 16 receives the control signal of the photographing operation unit from the terminal 20 and receives weight information measured by the scale 10, image information photographed by the camera 12, biometric information measured by the metal electrode 14, and the like. To provide. At this time, the communication unit 16 communicates with the terminal 20 by wire or wirelessly, such as NFC.

As shown in FIG. 3, the terminal 20 includes a weight scale controller 21, an image manager 22, a PPG signal checker 23, a PPI calculator 24, an ECG checker 25, and a feature point extractor. (26), the arrhythmia check unit 27 and the display unit 28.

The scale control unit 21 provides an on / off control signal to the operation unit 15 of the scale 10. The scale controller 21 of the terminal 20 can remotely control the operation of the camera 12, the light source 13, and the metal electrode 14 of the scale 10.

The image manager 22 receives an image captured by the camera 12 of the scale 10 in real time. In this case, the image manager 22 preferably stores the received image.

The PPG signal confirming unit 23 analyzes the plantar image photographed by the camera 12 in real time and checks a PPG (photolethysmoraphy) signal. The PPG signal confirms the change in blood volume in the blood vessels according to the heartbeat. The intensity values of the RED and Green bands of the image taken by the camera are periodically changed, and the pulse rate is measured by measuring the peaks per minute of the PPG signal. Can be calculated. At this time, the image for confirming the PPG signal is the convex part of the convex part of the lower part of the big toe, the convex part of the lower part of the little toe of the index finger toe 20 or 17 part of the sole image as shown in FIG. It is preferable that it is 27 site | part which is a recessed part in a part, and it is especially preferable that it is 17 site | part.

The PPI calculator 24 calculates a peak to peak interval (PPI), which represents a time between peaks and peaks, from the sole PPG signal confirmed by the PPG signal checker 23. Accordingly, as the heart rate increases, the PPI decreases. When relaxed, the heart rate decreases, which increases the PPI.

The ECG confirming unit 25 confirms the ECG measured from the metal electrode 14 of the scale and detects the R wave. The ECG checking unit 25 passes the signal provided from the metal electrode 14 through the high pass filter, and then inputs the signal through the signal buffer to the ECG IC to check the ECG. In this case, it is preferable to use a savitzky-golay filter that removes noise components from the original signal and restores peak components.

The ECG check unit 25 of the present invention uses a bridge-type AC-Coupling circuit and a filter to remove respiratory noise and power noise, and increases the SNR by using an in-phase signal and applies a savitzky-golay filter to the noise noise. It is preferable to detect the ECG signal by removing? In addition, a more stable signal can be obtained through a signal processing process and an in-phase LMS application technique. At this time, the transfer function Gdd of the AC-Coupling circuit is a Laplace transform between the differential output Vod and the differential input Vid , as shown in Equation 2 below.

Gdd = sR2C / (1 + sR2C) (2)

The feature point extractor 26 extracts the feature points for arrhythmia classification using the R wave detected by the PPI calculator 24 and the ECG checker 25. For example, PVC and PAC are classified by extracting RR interval, amplitude of R wave, and amplitude variation of R wave, classification of VT by extracting continuity of RR interval, extracting QRS width to normal, BBB, Paced beat can be classified.

The arrhythmia check unit 27 classifies arrhythmias such as PVC, PAC, Normal, BBB, Paced Beat, etc. using the feature points extracted from the feature point extractor 26. Accordingly, the arrhythmia classification unit may determine that the specific arrhythmia pattern is included in the ECG signal.

The display unit 28 displays the identification information for the PPI, ECG, and arrhythmia measured by the scale so that the user can check it. At this time, such information is preferably displayed in text or graph.

<Checking the PPG Signal from the Images Captured by the Camera on the Scale>

In order to confirm that the PPG signal measured at the site of the foot is the same as the PPG signal measured at the fingertip, the PPG signals of the sole and the index finger tip were measured.

First, the sole image was taken from the camera located inside the scale made of glass plate, and the image of the smartphone was taken with the index finger on the right hand. As shown in FIG. 4, five of 17, 20, 27, and 51 of the sole of the sole The change in the intensity of the PPG signal of the sites is measured in Table 1 together with the fingertips. At this time, the PPG signal was confirmed that the intensity values of the RED band and the green band of the image captured by the camera periodically change. Table 1 shows the change value of the intensity value of the green light in the range of 0 to 255.

	Experimenter 1	Experimenter 2	Experimenter 3	Experimenter 4	Experimenter 5	Average
Index finger	-0.01	0.086	0.667	0.257	0.146	0.229
17 sites	0.005	0.037	-0.315	0.174	0.113	0.014
20 sites	0.015	0.031	0.297	0.162	0.284	0.157
27 sites	0.038	0.283	0.625	0.335	0.313	0.318
51 sites	0.278	0.081	0.415	0.377	0.253	0.280

As shown in Table 1, PPG signals obtained from 17, 20, and 27 sites of the sole of the foot were most similar to the PPG signals at the tip of the index finger. In particular, it was confirmed that the mean PPG signal of 17 sites and 20 sites is similar to the mean PPG signal of the tip of the index finger.

On the other hand, the PPI of the PPG signal obtained from the tip of the index finger and each part of the sole of the foot was compared by using the Bland-Altman Plot and shown in Figures 5a to 5d, the PPI of the tip of the index finger and each part of the sole of the foot is a significant range It was confirmed that the distribution within.

<Confirmation of ECG Signal from Metal Electrode of Weight Scale>

The biopotential difference was measured based on the left foot and the right foot, and the reference signal was measured by using a biopack ECG module on the finger.

As shown in FIG. 6, the ECG signal measured by the weight scale using the metal electrode was similar to the ECG signal of the ECG module measured by the finger.

It should be understood that the present invention is not limited to the above-described preferred embodiments, but can be carried out in various ways without departing from the spirit of the present invention in various ways. If you can easily understand. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims below, the technical spirit is also regarded as belonging to the present invention.

[Description of the code]

10: weight scale 11: scaffolding

12: camera 13: light source

14 metal electrode 15 operating part

16: communication unit

20: terminal 21: scale control unit

22: image management unit 23: PPG signal confirmation unit

24: PPI calculation unit 25: ECG confirmation unit

26: feature point extraction unit 27: arrhythmia check unit

28: display unit

Claims (9)

1. A body scale 10 having a footrest 11 on which a foot is placed; It consists of a terminal 20 for receiving the weight information measured by the scale 10 while communicating with the scale 10,

   The scale 10 is,

   A camera 12 for photographing the soles of the feet 11 of the body scale 10;

   A light source 13 which emits light toward the upper part where the sole is located at the lower part of the footrest 11 of the body scale 10;

   A metal electrode 14 positioned on the footrest 11 of the weight scale 10 and measuring an electrode signal on the bottom of the foot scale;

   The control signal of the photographing operation unit is provided from the terminal 20, and the weight information measured by the scale 10, the image information photographed by the camera 12, and the biological information measured by the metal electrode 14 are transferred to the terminal 20. It includes a communication unit 16 for providing,

   The terminal 20,

   A scale controller 21 which provides an on / off control signal to the operation unit 15 of the scale 10;

   An image management unit 22 which receives the sole image captured by the camera 12 of the scale 10 in real time;

   A PPG signal confirming unit 23 for analyzing a plantar image captured by the camera 12 in real time to confirm a PPG (photolethysmoraphy) signal;

   A PPI calculator 24 for calculating a PPI representing a time between peaks and peaks from the PPG signal of the sole confirmed by the PPG signal checker 23;

   An ECG checking unit 25 for checking the ECG measured from the metal electrode 14 of the scale;

   A feature point extracting unit 26 for extracting feature points for arrhythmia classification using the PPI signal of the PPI calculating unit 24 and the ECG confirmed by the ECG checking unit 25;

   Arrhythmia check unit 27 for determining arrhythmia using the feature points extracted from the feature point extractor 26;

   Bio-signal measurement system including an arrhythmia using a smart body weight, characterized in that it comprises a display unit 28 for displaying the user to confirm the identification information for PPI, ECG, arrhythmia measured on the scale.
2. The smart scale of claim 1, further comprising an operating unit 15 for controlling the on / off of the camera 12, the light source 13, and the metal electrode 14. Biological signal measuring system including arrhythmia.
3. The biosignal measurement of claim 1, wherein the metal electrode 14 is positioned at the heel portion of the left leg LL and the right leg LL. system.
4. The biological signal measuring system of claim 1, wherein the communication unit 16 of the weight scale 10 communicates with the terminal 20 in a wired or wireless manner.
5. The biological signal measuring system of claim 1, wherein the image manager 22 of the terminal 20 stores the received image.
6. The method according to claim 1, PPG signal confirming unit 23 is a convex portion at the lower part of the big toe, 17 sites, 20 to 20 convex portion of the lower part of the toe in the index finger or concave at the lower part of 17 parts Biological signal measurement system including arrhythmia using a smart weight scale, characterized in that to identify the PPG signal from any one of the image of the site.
7. The biosignal measuring system of claim 6, wherein the PPG signal confirming unit (23) confirms the PPG signal in an image of 17 sites.
8. The method according to claim 1, ECG check unit 25 passes the signal provided from the metal electrode 14 through the high pass filter, and then inputs the ECG through the signal buffer to the ECG measuring IC to check the ECG, and the high pass filter A biosignal measurement system including arrhythmia using a smart weight scale, characterized in that the noise component is removed from the signal and the peak component is extracted.
9. The biosignal measuring system of claim 1, wherein the display unit is displayed in text or in a graph.

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