Apparatus for measuring a pulmonary function

Details Apparatus for measuring a pulmonary function Apparatus for measuring a pulmonary function

1979-05-23

1981-05-26

Michell, Robert W.

Surgery

Truss

Pad

128734, A61B 508

Patent

active

042691958

ABSTRACT:
A plurality of impedance pneumographs for measuring impedances at the locations of a human thorax are provided together with a pneumotachograph for measuring an amount of respiration. An impedance value measured at the inhalation starting point is subtracted from an impedance value measured at other time points to obtain an impedance variation. The impedance variations corresponding to the locations of the thorax are added to obtain a sum of the impedance variations. A ratio of the impedance at each location of the thorax to the sum of the impedance variations is calculated and an amount of ventilation at each location of the thorax is found by the impedance ratio and respiration amount.

REFERENCES:
patent: 3452743 (1969-07-01), Rieke
patent: 3882851 (1975-05-01), Sigworth
patent: 4036217 (1977-07-01), Ito et al.
patent: 4182314 (1980-01-01), Boughton
Barker, A. et al., "Simple Impedance Pneumograph and Volume Integrator", Mod. & Biol. Engr., vol. 11, No. 3, May 1973.
Geddes, L. A., "The Impedance Pneumograph", Aerospace Medicine, Jan. 1962, pp. 28-33.
Henderson, R. P., "An Impedance Camera for Spatially Specific Measurements of the Thorax", IEEE BME Trans., vol. BME-25, No. 3, May 1978.

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