DEVICE AND METHOD FOR ANALYZING THE IMPEDANCE OF THE HUMAN BODY, INSENSITIVE TO HIGH CONTACT IMPEDANCE AND PARASITIC EFFECTS Russian patent published in 2022 - IPC A61B5/53 

FIELD: medicine.

SUBSTANCE: group of inventions relates to medicine, namely to the device and method for determining bioimpedance. The first and third contact electrodes of the device are designed for contact with one part of the user’s body, the second and fourth contact electrodes are for contact with another part of the body. The device contains an alternating current source, a current measurement circuit, a voltage measurement circuit, a switch containing four ports, and a control unit. The AC power source and the current measurement circuit have a common ground. At the same time, the switch is controlled to switch it alternately to the first and second states for alternately forming, respectively, the first and second current measurement paths. In the first state of the switch, current flows through the user’s body through one of the electrodes intended for contact with one part of the body to one of the electrodes intended for contact with another part of the body, and in the second state of the switch, current flows in the opposite direction. In each of the current measurement paths, the current () is measured in the area of the electrode to which the current flows through the user’s body. In each of the current measurement paths, the voltage () between one electrode intended for contact with one part of the user’s body and the ground and the voltage () between another electrode intended for contact with another part of the user’s body and the ground are measured. The bioimpedance () of the user is determined based on the measured values of current and voltage.

EFFECT: accuracy of bioimpedance determination is improved without the need to take into account contact impedances, external components and parasitic effects with simplification of both the design of the device and the method for determining bioimpedance by using only one two-position switch instead of a 4x4 switch matrix with only two measurements.

17 cl, 22 dwg