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Exercise Devices

Spirometer

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Spirometer

Details

Inventors: Coleman, Steven J.;
Assignee: Thermo Electron Corporation (Waltham, MA)
Primary Examiner: Michell; Robert W.
Assistant Examiner: Cohen; Lee S.
Attorney, Agent or Firm: Neal; James L.

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.

DETAILED DESCRIPTION This invention relates to a recording spirometer of a simple design involving a recording surface mounted upon an expansible chamber for movement as a function of the expiratory flow of a patient.
The recording surface is engageable by a movable stylus to provide a plot thereon.
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.

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