Nakanishi Inc.

Kiyoshi Kawakubo

Wataru Suzuki

Toshiyuki Sadohara

Tetsuji Suzuki

Chihiro Yamane

Shouichi Takamori

A nozzle for a dental handpiece having a connector portion to be connected to a handpiece body, and a nozzle body, which is provided near its end with a notch of a substantially rectangular section cut out from the front face into the lateral faces, the notch forming upstream and downstream faces. The nozzle has a channel and an injection port thereof for transferring the mixture and a channel and an injection port thereof for transferring water, separate from each other. The channel for the mixture extends through the nozzle body along the front face from the connector portion to near the end, with the injection port for the mixture opened in the upstream face. With this nozzle, the mixture is properly injected onto a treatment site in subgingival treatment, while the mixture injected subgingivally is efficiently discharged supragingivally, to improve work efficiency in dental treatment.

Dental handpiece nozzle

The light-emitting devicehas electrode means, which includes cathode terminalgenerally in the form of a cylinder having openingsat its ends, and anode terminalgenerally in the form of a pin capable of being arranged in the cathode terminal. The cathode terminal, anode terminal, and LEDare arranged concentrically.

Light-emitting device

The light-emitting devicehas a translucent coverhaving a cylindrical shape and a flat light-projecting surfacefacing to the light-emitting part of an LED. The LEDis arranged in close proximity with the flat light-projecting surfacein the translucent coverto achieve efficient introduction of light from the LEDinto a light-receiving surface of optical fibers.

The present dental handpiece has a burr sleeve, a head section, an air supply passage for introducing compressed air into the head section for driving the burr sleeve, and an air discharge passage for discharging the compressed air. The air supply passage includes a through hole axially extending through the rear terminal part of the handpiece, and a tubular pressure regulating member and an air supply tube connected in series between the through hole and the head section. The pressure regulating member has an aperture for allowing communication with the air discharge passage, and an annular valve body arranged axially slidably for opening/closing the aperture. When the pressure of compressed air passing through the air supply passage exceeds a predetermined level, the valve body is slid to open the aperture to discharge the compressed air for regulating the pressure of the compressed air to be supplied to the burr sleeve.

Growing community of inventors

Kanuma, Japan

Kiyoshi Kawakubo