Low volume change detection

Details Low volume change detection Low volume change detection

1981-04-30

1983-11-08

Howell, Kyle L.

Surgery

Truss

Pad

73585, 73149, 73701, 73716, A61B 510, A61B 512

Patent

active

044136340

ABSTRACT:
Low volume flow measurement apparatus developed for hearing dysfunction diagnosis but also suited to other applications comprises means (10) defining a cavity operably communicable with the variable volume, a D.C. microphone (15) responsive to ambient pressure changes in the cavity due to variations in said volume, and a reference diaphragm (17) operably connected with the cavity and moveable under servo-control responsive to the microphone to maintain the cavity pressure constant. The cavity will normally have a vent valve (18) and in non-hearing application may be coupled with the subject volume by a plunger seal. For hearing diagnosis the apparatus is suitably carried by a helmet (21) or harness with a headphone on the opposite side for sound stimulus application, the helmet itself being at one end of a boom (22) with a counterweight (23).

REFERENCES:
patent: 3395697 (1968-08-01), Mendelson
patent: 3757769 (1973-09-01), Arguimbau et al.
patent: 4009707 (1977-03-01), Ward
patent: 4014320 (1977-03-01), Richards
patent: 4057051 (1977-11-01), Kerouac
patent: 4079198 (1978-03-01), Bennett
patent: 4201225 (1980-05-01), Bethea et al.
patent: 4237905 (1980-12-01), Keller et al.
patent: 4289143 (1981-09-01), Canavesio et al.

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