# US 10,244,961 B2 · Wearable device for measuring edema index and method of measuring edema index using same

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- Number: US 10,244,961 B2
- Document ID: US10244961B2
- Status: Granted
- Kind: B2
- Application number: 15/364,326
- Filed: 2016-11-30
- Published: 2018-02-22
- Granted: 2019-04-02
- Earliest claimed: 2016-08-22
- Assignees: Industry-Academic Cooperation Foundation, Chosun University
- Applicants: Industry-Academic Cooperation Foundation, Chosun University
- Inventors: Youn Tae Kim; Jae Hyo Jung; Si Ho Shin
- Web page: https://patentgrep.com/patent/US10244961B2

## CPC

- A61B 5/0531: Measuring skin impedance
- A61B 5/4878: {Evaluating oedema}
- A61B 5/681: {Wristwatch-type devices}
- A61B 5/7275: {Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor}
- G16H 50/30: for calculating health indices; for individual health risk assessment
- A61B 5/0533: Measuring galvanic skin response
- A61B 5/7225: {Details of analogue processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation (input circuits for detecting, measuring, or recording bioelectric or biomagnetic signals A61B5/30; specific diagnostic methods using bioelectric or biomagnetic signals A61B5/316)}
- A61B 2562/0214: Capacitive electrodes
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA

## Abstract

A wearable device for measuring an edema index includes: a band, wearable on a wrist; an electrode module including a pair of current electrodes and a pair of voltage electrodes; and a main module applying an alternating current (AC) to the pair of current electrodes, and obtaining an edema index of a human body from an AC voltage measured from the pair of voltage electrodes, wherein each of the pair of current electrodes and the pair of voltage electrodes is attached to one surface of the band in a row in a length direction of the band, and protrudes from the surface of the band to be in direct contact with the skin of the wrist when the band is worn on the wrist.

## Claims

### Claim 1

A wearable device for measuring an edema index comprising:
a band, wearable on a wrist;
an electrode module including a pair of current electrodes and a pair of voltage electrodes; and
a main module including an alternating current (AC) source connected to the pair of current electrodes for applying an alternating current (AC) to the pair of current electrodes, and a computing module configured to obtain an edema index of a human body from an AC voltage measured through the pair of voltage electrodes,
wherein each of the pair of current electrodes and the pair of voltage electrodes is attached to a first surface of the band in a row in a length direction of the band, and protrudes from the first surface of the band to be in direct contact with the skin of the wrist when the band is worn on the wrist, and
wherein the edema index is calculated by the computing module using the following formula:
EI
=
ECW
TBW
ECW
=
-
5.22
+
0.2
×
ht
⁢
2
R
f
+
0.005
×
ht
⁢
2
X
cf
+
0.08
×
wt
+
1.9
+
1.86
×
sex
TBW
=
0.73
×
(
-
4.104
+
0.518
×
ht
⁢
2
R
f
+
0.23
×
wt
+
0.13
×
X
cf
+
4.229
×
sex
,
wherein EI is defined as an edema index, ECW is defined as an vitro cell water content, TBW is defined as a total human body water content, ht is defined as the height of a user, Rf is defined as the resistance of biometric impedance obtained from the applied AC and the measured AC voltage in fKHz frequency Xcf is defined as the capacitive reactance of the biometric impedance obtained from the applied AC and the measured AC voltage in the fKHz frequency, wt is defined as the weight of the user, and sex is defined as the gender of the user with values 1 and 2 denoting male and female respectivey.

### Claim 2 (depends on 1)

The wearable device of claim 1, wherein the main module is attached to another surface of the band opposite the first surface, and comprises a voltage measuring module connected to the pair of voltage electrodes for measuring the phase and level of an AC voltage through the pair of voltage electrodes, a display module connected to the computing module and configured to display the edema index, and an input module configured to receive user information.

### Claim 3 (depends on 1)

The wearable device of claim 1, wherein the pair of voltage electrodes are disposed between the pair of current electrodes.

### Claim 4 (depends on 1)

The wearable device of claim 1, further comprising conductive wires connecting the pair of current electrodes to the main module, and connecting the pair of voltage electrodes to the main module,
wherein the conductive wires are disposed on a common plane or on different planes inside the band.

### Claim 5 (depends on 1)

The wearable device of claim 1, wherein the frequency of the AC is between 10 Khz and 200 KHz, and the level of the AC is between 60 μA and 100 μA.

### Claim 6

A method of measuring an edema index using a wearable device, the wearable device comprising a band, wearable on a wrist, and an electrode module having a pair of current electrodes and a pair of voltage electrodes respectively attached to a first surface of the band in a row in a length direction of the band, and respectively protruding from the first surface of the band to be in direct contact with the skin of the wrist when the band is worn on the wrist, the method comprising:
receiving user information including the weight, gender, and height of a user;
applying an alternating current (AC) to the pair of current electrodes;
measuring an AC voltage through the pair of voltage electrodes; and
obtaining an edema index, based on the user information, the applied AC, and the measured AC voltage,
wherein the edema index is obtained using the following formula:
EI
=
ECW
TBW
ECW
=
-
5.22
+
0.2
×
ht
⁢
2
R
f
+
0.005
×
ht
⁢
2
X
cf
+
0.08
×
wt
+
1.9
+
1.86
×
sex
TBW
=
0.73
×
(
-
4.104
+
0.518
×
ht
⁢
2
R
f
+
0.23
×
wt
+
0.13
×
X
cf
+
4.229
×
sex
,
wherein EI is defined as an edema index, ECW is defined as an in vitro cell water content, TBW is defined as a total human body water content, ht is defined as the height of a user, Rf is defined as the resistance of biometric impedance obtained from the applied AC and the measured AC voltage in a fKHz frequency, Xcf is defined as the capacitive reactance of the biometric impedance obtained from the applied AC and the measured AC voltage in the fKHz frequency, wt is defined as the weight of the user, and sex is defined as the gender of the user with values 1 and 2 denoting male and female, respectively.