Device for preventing intrusion of foreign matter into dental ha

Details Device for preventing intrusion of foreign matter into dental ha Device for preventing intrusion of foreign matter into dental ha

1991-02-26

1991-12-24

Wilson, John J.

Dentistry

Apparatus

Having motor or means to transmit motion from motor to tool

433129, A61C 105, A61C 114

Patent

active

050747886

ABSTRACT:
A device for preventing intrusion of foreign matter into a dental handpiece includes an end cap secured to a bur sleeve for rotation in unison with the bur sleeve. Around the end cap, there are delimited gap sections the one end of which communicates with a forward or lower ball bearing positioned towards a tool inserting opening and the other end of which is opened at the foremost part of the handpiece. A discharge port passing through the main body of the handpiece and communicating with the gap sections is formed at the foremost part of the handpiece. With rotation of the bur sleeve, the end cap is rotated so that the pressure within the gap sections is decreased to suck the foreign matter, such as cut tooth particles or chips, which is expelled to outside through the discharge port under the centrifugal force of the end cap.

REFERENCES:
patent: 2983519 (1961-05-01), Staunt
patent: 4202102 (1980-05-01), Nakanishi
patent: 4369034 (1983-01-01), Garnier et al.
patent: 4975056 (1990-12-01), Eibofner

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