Patent ID: 7474917

Claim:
An impedance measurement system for measuring skin impedance in a small skin region, comprising: an electrode unit having a plurality of current supply electrodes for supplying a constant current and a plurality of measurement electrodes separate from the current supply electrodes for measuring a response signal of skin, a first electrode distance adjuster for adjusting a distance between the current supply electrodes, and a second electrode distance adjuster for adjusting a distance between the measurement electrodes, wherein: the first electrode distance adjuster includes a first stationary screw line connected to the current supply electrodes, a first rotary screw joined to the first stationary screw line and rotating the first stationary screw line to move the current supply electrodes along the first stationary screw line, and a separate fixing stud for fixing each of the current supply electrodes to the first stationary screw line, the second electrode distance adjuster includes a second stationary screw line connected to the measurement electrodes, a second rotary screw joined to the second stationary screw line and rotating the second stationary screw line to move the measurement electrodes along the second stationary screw line, and a separate fixing stud for fixing each of the measurement electrodes to the second stationary screw line, and the first stationary screw line and the second stationary screw line are separated from each other by a predetermined distance and are perpendicular to each other; and a current source for supplying the constant current to the current supply electrodes, wherein the skin impedance is obtained from the measured response signal.