Peak flow meter for measuring ventilatory capacity

Measuring and testing – Volume or rate of flow – Using differential pressure

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128725, 7386153, A61B 5087

Patent

active

056728336

ABSTRACT:
A peak flow meter has a body forming a chamber along which a piston can be moved against the force of a spring by a subject exhaling through an inlet into the chamber. A slot runs along a side of the chamber to allow the air to escape and a pointer is movable along the slot by the piston to indicate its maximum displacement. A deflector at the chamber inlet concentrates the flow through the chamber towards the side at which the slot is located. By the use of such a deflector it is possible to measure reliably relatively small peak exhalation rates.

REFERENCES:
patent: 4041935 (1977-08-01), Garbe
patent: 5003828 (1991-04-01), Van Den Burg
patent: 5224487 (1993-07-01), Bellofatt et al.
patent: 5357972 (1994-10-01), Norlien

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