Security device comprising a stop member for drilling instrument used in particular in dental surgery and device pre-calibrating and storing drilling depth
First Claim
1. A safety device comprising:
- a stop for a rotary drilling instrument, the stop being movable on a rotary drilling instrument to a position corresponding to a desired drilling depth of the rotary drilling instrument to prevent exceeding the desired drilling depth; and
means for converting rotary motion of the rotary drilling instrument to relative motion between the stop and the rotary drilling instrument to cause the drilling instrument to withdraw to the rear relative to the direction of drilling by action of said means as soon as a front part of the stop comes in contact with a surface.
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Accused Products
Abstract
A security device includes a stop member for a rotary drilling instrument used in particular in dental surgery. The stop member is capable of being positioned at a desired depth of drilling and of preventing the depth from being exceeded. The two elements drilling instrument and the stop member include coupling elements directly or indirectly linking them together and co-operating elements capable of transforming their movement, such that when the device is operating, the drilling instrument is retracted rearwards relative to the drilling direction and to the position of the stop member under the action of the elements when the front part of the stop member comes in contact with a neighboring surface. The co-operating elements preferably consist of a screw-nut system, the direction of the thread(s) of the system and the rotating direction of the drill being opposite. A device comprising a gauge containing a piston enables to pre-calibrate and store the desired drilling depth.
339 Citations
11 Claims
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1. A safety device comprising:
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a stop for a rotary drilling instrument, the stop being movable on a rotary drilling instrument to a position corresponding to a desired drilling depth of the rotary drilling instrument to prevent exceeding the desired drilling depth; and
means for converting rotary motion of the rotary drilling instrument to relative motion between the stop and the rotary drilling instrument to cause the drilling instrument to withdraw to the rear relative to the direction of drilling by action of said means as soon as a front part of the stop comes in contact with a surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A safety device comprising:
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a drill having an operating bit at one end thereof and an external screw thread on a shank thereof, said external screw thread being wound in a first direction that is opposite to a second direction of operation of said drill;
a stop coaxial with said drill and having a rear end with an internal screw thread that mates with said external screw thread of said drill and a front end that engages a work surface during operation of the device, said stop being movable longitudinally along said drill by rotating said stop; and
said internal and external screw threads having a frictional engagement that overcomes an inertia of said stop to cause said stop to rotate in the second direction with said drill when said drill is rotating in the second direction and said front end of said stop is not engaging a work surface, the frictional engagement being overpowered by engagement of said front end of said stop with a work surface to cause said stop to rotate relative to said drill and move toward said operating bit.
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Specification