Spirometer

Details Spirometer Spirometer

1975-03-26

1976-10-12

Michell, Robert W.

Surgery

Truss

Perineal

346 72, A61B 508

Patent

active

039851249

ABSTRACT:
A spirometer for measurement of both the rate and volume of expiratory breathing, and creating a graphic record of the same. In a preferred embodiment, the spirometer incorporates an expansible chamber of the piston type, fitted with a molded rolling rubber seal. A recording surface in the form of a card is attached to the piston and a pen is moved across the face of the card at a constant velocity as a subject breathes into the expansible chamber. There is obtained a plot of the volume of expiration flow as a function of time. A control system provides for automatic operation.

REFERENCES:
patent: 3086515 (1963-04-01), Jones
patent: 3311109 (1967-03-01), Gruen et al.
patent: 3363260 (1968-01-01), Garbe
patent: 3722506 (1973-03-01), McMillan, Jr.
patent: 3817238 (1974-06-01), Matson
patent: 3848583 (1974-11-01), Parr
patent: 3889672 (1975-06-01), Woldring

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