Dental handpiece

Details Dental handpiece Dental handpiece

1991-04-25

1991-12-03

Wilson, John J.

Dentistry

Apparatus

Having intra-oral dispensing means

433 84, A61C 112

Patent

active

050696203

ABSTRACT:
A dental handpiece includes an arm, and a hollow head formed on a distal end of the arm. The head has a nozzle projecting from an inner surface thereof. Cooling water, fed via a main coolant passageway of the arm, is injected from the nozzle. A generally cylindrical holder for supporting a dental burr is rotatably supported within the head. The cooling water injected from the nozzle passes through an auxiliary coolant passageway, formed axially through the dental burr, and is injected from a grinding portion of the dental burr. The dental handpiece also includes a pump mechanism for feeding the cooling water. Injected from the nozzle, into the auxiliary coolant passageway of the dental burr. The pump mechanism includes a screw mounted on the outer periphery of the nozzle, and a pump housing which is mounted on one end portion of the holder disposed close to the nozzle and surrounds the screw. The cooling water within the pump housing rotates in response to the rotation of the holder and the pump housing, and therefore is guided by the stationary screw to be fed into the auxiliary coolant passageway of the dental burr.

REFERENCES:
patent: 3092908 (1963-06-01), Flatland
patent: 3609058 (1971-09-01), Tarsoly
patent: 3762052 (1973-10-01), Melde
patent: 4021920 (1977-05-01), Kirschner et al.
patent: 4266933 (1981-05-01), Warden et al.
patent: 4869668 (1989-09-01), Seney

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