Patent ID: 11872028
Assignee: HITACHI, LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A biological measurement method comprising:
attaching at least two electrodes to a patient;
sending, via a power supply, an AC current to flow between the at least two electrodes;
placing on the patient, at least two coils so as to sandwich a line linking the at least two electrodes, and detecting a magnetic field related to a change in the AC current, the change accompanying a change in impedance of the patient; and
performing, via a detection circuit, an addition process to add together or a subtraction process to take the difference between signals related to the magnetic field detected with the at least two coils, and outputting the signals as the change in the impedance,
wherein the at least two electrodes are symmetrically positioned on a chest or an abdomen of the patient with respect to a sagittal plane of the patient, and
the at least two coils are arranged symmetrically with respect to the line linking the at least two electrodes.