US 4,021,920 AGranted

Drilling or milling apparatus for the working of live bone, particularly for dentistry

OwnerHorst Kirschner, Wolfgang Meyerinventors

Life of this patent

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Abstract

Cooling means for bone or tooth cutting tool. In order to cool the cutting surfaces of a bone or tooth cutting tool, there is provided in the supporting shank of the cutting tool a first chamber containing the driving means for the tool and a second chamber within or communicating with the cutting tool itself, said two chambers being separated by a perforable diaphragm seal. Conduit means for introducing cooling media into the interior of said tool is received into a suitable recess in the upper portion of the tool housing, extends through said first chamber and is provided with a pointed tip for piercing said diaphragm seal for extending into said second chamber. Cooling media is then introduced into the interior of said tool and exits therefrom for cooling both the tool itself and the material being cut.

Claims18

Dependent claims

In a hand held apparatus including a handle having driving shaft means rotatably supported thereon and tool means rotatably driven by said driving shaft means, said driving shaft means including means thereon defining a passageway extending coaxially therethrough, the improvement comprising tube means extending through said passageway means for carrying a fluid therethrough, said tube means being smaller in size than said passageway means to define a clearance space therebetween, said tool means having a work end and means defining a longitudinal channel therein communicating with said work end;

resilient seal means separate from said tool means at the end of said longitudinal channel means remote from said work end;
and
coupling means for coupling said tool means to said driving shaft means, said tube means extending into said longitudinal passageway means, the exterior of said tube means and the end of said tool means remote from said work end being tightly engaged with said resilient seal means to seal said longitudinal channel means adjacent the end thereof remote from said working end of said tool means from said passageway means in said driving shaft means.

Dependencies are inferred from the claim text.

Facts

Application: 05/558,075Filed 13 Mar 1975 · continuation in part
Priority: DT 233102318 Jun 1973
Granted: 10 May 1977
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

A61C 1/12
Machine parts specially adapted for dentistry: angle hand-pieces
A61B 17/1644
Instruments for performing osteoclasis; Drills or chisels for bones; Trepans: using fluid other than turbine drive fluid
A61C 1/055
Ducts for supplying driving or cooling fluid, e.g. air, water: through the working tool, e.g. hollow burr
A61C 3/02
Dental tools or instruments: tooth drilling or cutting instruments; Instruments acting like a sandblast machine