Drill for implant surgery
A drill for an implant surgery is provided which allows a mucous membrane in the maxillary sinus to be quickly and safely lifted without being damaged during a surgery for the maxillary sinus. The drill for use in an implant surgery includes a connection portion formed at an upper end of a body of the drill to be connected with a driving device; and a cutting portion formed at a lower end of the body and having a cutting blade for drilling, wherein an outer circumferential edge of a distal end of the cutting portion protrudes rather than a center of the distal end of the cutting portion.
1. A drill for use in an implant surgery, the drill comprising:
a connection portion formed at an upper end of a body of the drill to be connected with a driving device; and
a cutting portion formed at a lower end of the body and having a plurality of cutting blades for drilling,
wherein an outer circumferential portion of a distal end of the cutting portion protrudes in a rounded, convex dome shape relative to a center of the distal end of the cutting portion that is concavely depressed and is configured such that a bone disk is formed at the distal end of the cutting portion during a drilling work, and such that a mucous membrane is prevented from being damaged even though the cutting portion is in direct contact with the mucous membrane during the drilling work,
wherein each of the plurality of cutting blades includes a guide portion that extends parallel to a longitudinal axis of the drill and a leading cutting face that extends from a distal end of the guide portion and is defined in part by a leading edge that is curved radially inward toward a central axis of the cutting portion and curved toward a cutting direction of the drill as the leading edge extends to a distal end of the cutting blade, the leading cutting face of the cutting blade having a hook shape that is curved toward the cutting direction of the drill as the leading cutting face extends to the distal end of the cutting blade, and
wherein a respective chip pocket is formed between adjacent cutting blades of the plurality of cutting blades so that cut bone chips are easily discharged therethrough and stored therein, one face of the chip pocket being defined by the leading cutting face from one of the adjacent cutting blades, which has the hook shape that is curved toward the cutting direction of the drill, and another face of the chip pocket being defined by a trailing face of the other one of the adjacent cutting blades, the trailing face being a flat surface parallel to the longitudinal axis of the drill.
2. The drill as claimed in claim 1 , wherein each of the cutting blades has one or more sloped surfaces at an inner side of a tip thereof.
3. The drill as claimed in claim 2 , wherein the guide portion of each cutting blade has a predetermined thickness at a side surface thereof, thereby preventing the drill from being shaken during the drilling work.
4. The drill as claimed in claim 1 , wherein a stepped portion protruding outwards from the body and a stop portion further protruding outwards from a proximal end of the stepped portion are formed on an outer circumference of the body between the connection portion and the cutting portion, whereby a stopper member for restricting a drilling depth may be fixedly fit around the stepped portion.
5. A drill for use in an implant surgery, the drill comprising:
a cutting portion having a plurality of cutting blades for drilling, each cutting blade having a distal shape with a sloped surface configured so that a bone disk is formed and a mucous membrane in a maxillary sinus may be lifted while some bone chips generated during a drilling work are discharged through a space between the sloped surface and the bone disk,
wherein each cutting blade includes a guide portion that extends parallel to a longitudinal axis of the drill and a leading cutting face that extends from a distal end of the guide portion and is defined in part by a leading edge that is curved radially inward toward a central axis of the cutting portion and curved toward a cutting direction of the drill as the leading edge extends to a distal end of the cutting blade, the leading cutting face of the cutting blade having a hook shape that is curved toward the cutting direction of the drill as the leading cutting face extends to the distal end of the cutting blade,
wherein an outer circumferential portion of a distal end of the drill is rounded to define a convex profile at the outer circumferential portion, and
wherein a respective chip pocket is formed between adjacent cutting blades of the plurality of cutting blades so that cut bone chips are easily discharged therethrough and stored therein, one face of the chip pocket being defined by the leading cutting face from one of the adjacent cutting blades, which has the hook shape that is curved toward the cutting direction of the drill, and another face of the chip pocket being defined by a trailing face of the other one of the adjacent cutting blades, the trailing face being a flat surface parallel to the longitudinal axis of the drill.