Apparatus for measuring airway resistance

Details Apparatus for measuring airway resistance Apparatus for measuring airway resistance

1992-09-04

1993-08-10

Kamm, William E.

Surgery

Truss

Pad

128725, A61B 508

Patent

active

052339980

ABSTRACT:
Apparatus for measuring airway resistance, which apparatus comprises a housing, a bore in the housing, a flow measuring device which is positioned in the bore and which is for measuring a flow of air through the bore caused by a person exhaling or inhaling, an interrupting valve device which is for interrupting the flow of air through the bore, a drive device for moving the interrupting valve device between a bore closing position and a bore opening position, and a pressure sensor device for sensing variations in pressure in the bore caused by the interrupting valve device closing and opening the bore and thus interrupting the flow of air through the bore, and the apparatus being such that the bore is of circular cross section, and the interrupting valve device is a non-circular eliptical plate member which is mounted in the bore for pivotal movement by the drive device between the bore closing position and the bore opening position and which extends at an acute angle to the bore in the bore closing position.

REFERENCES:
patent: 3036569 (1962-05-01), Clements
patent: 3410264 (1968-11-01), Frederick
patent: 3621833 (1971-11-01), Crane
patent: 3726271 (1973-04-01), Mondshine
patent: 3857385 (1974-12-01), Hampl
patent: 4082088 (1978-04-01), Franetzki
patent: 4122839 (1978-10-01), Franetzki
patent: 4220161 (1980-09-01), Berlin
patent: 4259967 (1981-04-01), Voreen
patent: 4558710 (1985-12-01), Eichler
Effect of Valve Closure Time on the Determination of the Respiratory Resistance by Flow Interruption, Bates et al, Medical Biological Engineering and Computing, 1985, vol. 25, pp. 136-140.
A multiplex cathode-ray-tube display w/ digital readout for a body plethysmograph, Reyohds et al, May 1973 Medical and Biological Engineering.
Estimation of Pulmonary Resistance by Repetitive Interruption of Airflow Clements et al, Journal of Clinical Investigation, vol. 38, No. 7, Jul. 1959, pp. 1262-1270.

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