A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
A61C 3/02 (2006.01) A61C 1/05 (2006.01)
Patent
CA 2061368
An air-turbine type dental handpiece in which the handle has separate passages for air and water under pressure respectively to drive the turbine to rotate a bur and furnish cooling water to the bur which has an axial passage entirely therethrough to direct the cool- ing water where the cutting end of the bur contacts tooth material for producing a dental preparation to receive filling material and the like. The head of the handpiece has a chamber within which the turbine and bearings are mounted and also includes a rotary coupling to direct cooling water to the inner end of the axial pas- sage of said bur and prevents escape of the cooling water to the interior of the chamber for the turbine and bear- ings. The coupling is bipartite and one of the parts comprises the innermost end of the bur when mounted with- in the shaft of the turbine. Control mechanism to furnish and regulate the pressure of air and water to the hand- piece also comprises part of the invention and an anti- clogging device is included in the passage in the bur.
Gowling Lafleur Henderson Llp
Seney John S.
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