Ventilatory capacity measuring instrument

Details Ventilatory capacity measuring instrument Ventilatory capacity measuring instrument

1974-07-12

1976-05-25

Michell, Robert W.

Surgery

Truss

Perineal

73239, 272 99, A61B 508

Patent

active

039585654

ABSTRACT:
A human ventilatory capacity measurement instrument, of the kind which measures the peak flow rate of a single forced expiration, comprises a hollow cylindrical body housing a coaxial rod on which is carried a piston spring-biased in one longitudinal sense. The body is longitudinally slotted and has an indicator engaged in the slot for movement therealong by the piston when blown against its spring bias, but the indicator is returned to its starting position in the slot by independent movement. A scale is provided alongside the slot to give a measure of peak flow rate by the final rest position of the indicator when pushed by the piston.

REFERENCES:
patent: 471389 (1892-03-01), Lacey
patent: 1541750 (1925-06-01), Park
patent: 3298362 (1967-01-01), Lippett, Jr. et al.
patent: 3635214 (1972-01-01), Rand
patent: 3720202 (1973-03-01), Cleary
patent: 3826247 (1974-07-01), Ruskin et al.
patent: 3862628 (1975-01-01), Williams

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