Wearable device for measuring edema index and method of measuring edema index using same

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.