Adjustable length drills
First Claim
1. A drill of variable length comprisinga) a generally cylindrically shaped drill shaft having a drilling portion which terminates in a drilling end point, the surface of said end point comprising an end-cutting surface and a plurality of recesses arranged vertically on said drilling portion at various distances from said end point,b) a stop member having an outer perimeter and a bore therethrough said bore constituting an inner perimeter to permit the slidable positioning of said stop member around said drilling portion, said inner perimeter and said outer perimeter constituting an interface,i) said stop member including a first hole extending from the outer perimeter thereof through said stop member and terminating at said interface, such that said first hole is registerable with at least one of said recesses,ii) said first hole having screw fastening means for locking engagement and disengagement with at least one of said recesses at said interface thereby to fasten said stop member to said drilling portion when said screw fastening means engages said recess and to unfasten said stop member when said screw fastening means is disengaged from said recess,iii) said stop member further including an anchoring hole in said outer perimeter essentially opposite said first hole, said anchoring hole being engageable with a fixed alignment device whereby when said stop member engages said fixed alignment device the slidable movement of said drilling portion through said stop member is facilitated.
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Accused Products
Abstract
A drill instrument with calibrated depressions as markings on the shaft set at determinable distances apart, e.g. at 1 mm increments is disclosed. These calibrations are designed to give a visible depth gauge indication when the tip or point of the drill is at the full length of the depth of a drilled hole. A stop means is variably fixable to the drill at determinable locations. This stop defines a predetermined length available for drilling a hole into bone or a tooth canal up to the precise location of the stop on the drill corresponding to the depth desired to be drilled.
An organizer block or kit accommodates the drills and stops of the invention and preferably provides an alignment device for preparing drills having the pre-determined lengths according to the invention via a drill-length determining device for applying the stop means to the drill at the desired pre-determined length.
73 Citations
19 Claims
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1. A drill of variable length comprising
a) a generally cylindrically shaped drill shaft having a drilling portion which terminates in a drilling end point, the surface of said end point comprising an end-cutting surface and a plurality of recesses arranged vertically on said drilling portion at various distances from said end point, b) a stop member having an outer perimeter and a bore therethrough said bore constituting an inner perimeter to permit the slidable positioning of said stop member around said drilling portion, said inner perimeter and said outer perimeter constituting an interface, i) said stop member including a first hole extending from the outer perimeter thereof through said stop member and terminating at said interface, such that said first hole is registerable with at least one of said recesses, ii) said first hole having screw fastening means for locking engagement and disengagement with at least one of said recesses at said interface thereby to fasten said stop member to said drilling portion when said screw fastening means engages said recess and to unfasten said stop member when said screw fastening means is disengaged from said recess, iii) said stop member further including an anchoring hole in said outer perimeter essentially opposite said first hole, said anchoring hole being engageable with a fixed alignment device whereby when said stop member engages said fixed alignment device the slidable movement of said drilling portion through said stop member is facilitated.
Specification