Triggering circuit for an aerosol drug-dispensing device

Details Triggering circuit for an aerosol drug-dispensing device Triggering circuit for an aerosol drug-dispensing device

2008-04-15

2008-04-15

DeMille, Danton D. (Department: 3771)

Surgery

Liquid medicament atomizer or sprayer

C128S203120, C073S861850

Reexamination Certificate

active

07357133

ABSTRACT:
An electronic gas flow triggering circuit for use in an aerosol drug dispensing device has a voltage source and a self-nulling circuit to which voltage is supplied from the voltage source. A hot wire anemometer filament forms a component of the bridge circuit which is adapted to maintain a constant resistance of the anemometer filament, the bridge drive voltage being dependent upon the gas flow across the anemometer filament. A comparator compares the bridge output voltage with a reference voltage and provides a triggering signal to operate the device if the bridge drive voltage is greater than the reference voltage.

REFERENCES:
patent: 3352154 (1967-11-01), Djorup
patent: 3991304 (1976-11-01), Hillsman
patent: 4706664 (1987-11-01), Snook et al.
patent: 5487378 (1996-01-01), Robertson et al.
patent: 5743252 (1998-04-01), Rubsamen et al.
patent: 6470741 (2002-10-01), Fathollahzadeh
patent: WO 92/07599 (1992-03-01), None

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