Dentistry – Apparatus – Having intra-oral dispensing means
Patent
1993-03-23
1993-11-16
Wilson, John J.
Dentistry
Apparatus
Having intra-oral dispensing means
433 82, 433 98, A61C 110
Patent
active
052618161
ABSTRACT:
A coolant delivery system for a high speed dental cutting handpiece. The system includes a coolant reservoir, a selectively operable pressurized gas source, and a pressurized-gas distribution structure. The distribution structure has a gas entry chamber, a first passage having a reduced cross-section dimension leading from the entry chamber to the reservoir, a second passage leading from the reservoir to the entry chamber, and a third passage leading from the entry chamber to the exterior. Within the entry chamber is disposed a closure member, preferably a flexible membrane, which is situated to close the second and third passages when pressurized gas, en route from the gas source to the first passage for pressurization of the reservoir and ultimate coolant delivery to the handpiece, strikes the closure member. Coolant flow from the reservoir begins substantially coincidentally with handpiece operation and ceases substantially immediately with cessation of handpiece operation since pressurizing gas can then escape from the reservoir through the second and third passages.
REFERENCES:
patent: 3505737 (1970-04-01), Merolla
patent: 3638310 (1972-02-01), Austin, Jr.
patent: 4302185 (1981-11-01), Hall
patent: 4470812 (1984-09-01), Martens et al.
patent: 4973247 (1990-11-01), Varnes et al.
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