Dentistry – Apparatus – Having intra-oral dispensing means
Patent
1995-05-08
1997-04-08
O'Connor, Cary E.
Dentistry
Apparatus
Having intra-oral dispensing means
451 90, 451 99, 222161, 239144, A61C 302
Patent
active
056181779
ABSTRACT:
A pressurized feeder vessel feeds powdered material into a stream of propellant gas. The feeder vessel includes a funnel-shaped hopper that is resiliently suspended by an elastic member inside the vessel. A vibrator such as an electric motor with an eccentric weight on its shaft vibrates the bottom end of the hopper. The vibration forces of the vibrator are preferably transferred to the hopper via a flexible diaphragm. The hopper is thus subjected to primary vibration forces and torques from below, and secondary, reaction vibration forces and torques from above. This induces the powder in the hopper to fluidize thoroughly and to circulate. In particular, it circulates over and past an inlet orifice, through which powder exits the hopper and enters the propellant stream. Powder circulation thus also prevents clogging of the inlet orifice and leads to more even flow rates. The invention is particularly well suited for delivering abrasive powder to a hand-held dental tool for abrasive treatment of teeth.
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Advertisement: "MicroPrep.TM.Cavity Preparation System," Sunrise Technologies, undated.
Dove Systems, Inc.
O'Connor Cary E.
Slusher Jeffrey
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