Ventilatory instrument for measuring peak expiratory flow

Details Ventilatory instrument for measuring peak expiratory flow Ventilatory instrument for measuring peak expiratory flow

A - Human Necessities

61

B

A61B 5/087 (2006.01) G01F 1/28 (2006.01)

Patent

CA 2074481

A peak flow meter has a flexible resilient vane (15) which is rigidly mounted by one end and which has its other end en- gaged with a slider indicator (17) which slides in a slot (16) formed in a curved wall of the casing. In use the human subject blows into the casing through a mouthpiece (14). The vane (15) is bent by the expiration which vents through the part of the slot (16) between the slider (17) and the mouthpiece (14). The slider (17) stops at the furthest point from the mouthpiece (14) to which it is moved by the vane (15) and that point is an indication of the peak expiratory flow of the human subject.

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