Dental spray hand piece

Details Dental spray hand piece Dental spray hand piece

1983-02-22

1985-07-30

Mancene, Gene

Dentistry

Apparatus

Having intra-oral dispensing means

433 32, 251 10, 222571, A61C 1702

Patent

active

045319120

ABSTRACT:
The present invention is directed to a dental spray hand piece which has a valve for controlling the flow of an agent through an agent line that extends through the hand piece to a spray nozzle and an arrangement for preventing dripping of the agent from an end of the nozzle when the valve stops flow of the agent through the line, characterized by the arrangement for preventing dripping including a hose section of elastic material being positioned between the valve and the nozzle, a thrust piece for acting on the hose section in an arrangement for moving the thrust piece from a position engaging the hose section and a second position partially deforming the hose section from an enlarged cross-section to a cross-section of the flow through the valve. Thus, when the valve stops flow the hose section resumes its enlarged cross-section which causes a suction to draw fluid in the line between the valve and the end of the nozzle inward from the end of the nozzle.

REFERENCES:
patent: 573601 (1896-12-01), Jones
patent: 1556181 (1925-10-01), Tyree
patent: 4117861 (1978-10-01), Betush
patent: 4149315 (1979-04-01), Page, Jr. et al.

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