Piston type recording spirometer

Details Piston type recording spirometer Piston type recording spirometer

A - Human Necessities

61

B

73/144, 234/5

A61B 5/08 (2006.01)

Patent

CA 1073701

ABSTRACT OF THE INVENTION MAR 18 1980 A spirometer for measurement of both the rate and volume of expiratory breathing, and creating a graphic record of the same. The spirometer incorporates an exp?nsible 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 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 auto- matic operation.

258724

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