Apparatus and method for impedance measurement of body tissues

Details Apparatus and method for impedance measurement of body tissues Apparatus and method for impedance measurement of body tissues

1987-06-15

1989-04-25

Picard, Leo P.

Surgery

Truss

Pad

128668, 128671, 128734, A61N 136

Patent

active

048237973

ABSTRACT:
An apparatus for impedance measurement of body tissue has a signal source which impresses an electrical signal in body tissue, circuitry for acquiring an impedance signal from the body tissue dependent on the impressed electrical signal, and an evaluation stage for evaluating the impedance signal by filtering higher frequency components and low frequency components from the impedance signal which correspond to the conductance of the tissue. A correction stage corrects the high frequency signal components with the low frequency signal components by eliminating the higher frequency signal components of influences due to changes in the tissue conductance. The corrected signal is supplied at an output of the correction stage.

REFERENCES:
patent: 3532086 (1970-10-01), Underwood
patent: 3608542 (1971-09-01), Pacela
patent: 3994284 (1976-11-01), Voelker
patent: 4580575 (1986-04-01), Birnbaum et al.
patent: 4686987 (1987-08-01), Salo et al.
patent: 4697591 (1987-10-01), Lekholm et al.
patent: 4738264 (1988-04-01), Orlando

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