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US 6,312,432 B1Granted
Bone drill
AssigneeNEMCO Medical
InventorJohn W. Leppelmeier
Life of this patent
Estimating the term…
Abstract
A bone drill extending along an axis has (1) a stabilizing point with first and second cutting edges which extend to a tip, conical wall sections and flutes on opposite sides of each of the first and second cutting edges and (2) first and second lands extending radially outwardly from the conical wall sections, each land having a radially outwardly extending cutting edge.
Claims25
A bone drill comprising:
- (a) a shank extending along an axis from a first end toward a second end;
- (b) a stabilizing point extending to a tip at said second end, said stabilizing point including
- (i) first and second cutting edges extending to said tip, each said first and second cutting edge lying on a plane substantially parallel to said axis,
- (ii) a first flute adjacent said first cutting edge and a second flute adjacent said second cutting edge, and
- (iii) a substantially conical first wall section on the opposite side of said first cutting edge from said first flute and a substantially conical second wall section on the opposite side of said second cutting edge from said second flute;
- and
- (c) a first land extending outwardly from said first wall section, said first land including a first radially outwardly extending cutting edge and a second land extending outwardly from said second wall section, said second land including a second radially outwardly extending cutting edge.
4 more elements
A bone drill comprising:
- (a) an elongated shaft extending along an axis from a first end adapted to be engaged to a power means for rotating the shaft to a second end defining a tip lying substantially on said axis;
- (b) a stabilizing point extending from said tip toward said first end, said stabilizing point including
- (i) first and second wall sections extending from said tip tapering outwardly, at an acute angle relative to said axis in a direction toward said first end,
- (ii) a first cutting edge adjacent said first wall section and a second cutting edge adjacent said second wall section, and
- (iii) a first flute between said first cutting edge and said second wall section and a second flute between said second cutting edge and said first wall section;
- and
- (c) a first land extending substantially radially outwardly from said first wall section and a second land extending substantially radially outwardly from said second wall section, said first land including a first leading edge defining a cutting edge lying on a plane substantially perpendicular to said axis and said second land including a second leading edge defining a cutting edgy lying on a plane substantially perpendicular to said axis.
4 more elements
A bone drill comprising:
- (a) an elongated shaft extending along an axis from a first end adapted to be engaged to a power means for rotating the shaft to a second end defining a tip lying substantially on said axis;
- (b) a stabilizing point extending from said tip toward said first end, said stabilizing point including
- (i) first and second wall sections extending from said tip tapering outwardly at an acute angle relative to said axis in a direction toward said first end,
- (ii) a first cutting edge adjacent said first wall section and a second cutting edge adjacent said second wall section,
- (iii) a first flute between said first cutting edge and said second wall section and a second flute between said second cutting edge and said first wall section;
- and
- (iv) a first helical flute adjoining said first flute and a second helical flute adjoining said second flute, said first and second helical flutes each being separated by helical threads, each of said first and second helical threads including a cylindrical wall section and a concave arcuate section extending from one of said cylindrical wall sections to a helical flute;
- and
- (c) a first land extending substantially radially outwardly from said first wall section and a second land extending substantially radially outwardly from said second wall section, said first land including a first leading edge defining a cutting edge and said second land including a second leading edge defining a cutting edge.
6 more elements
A bone drill comprising:
- (a) an elongated shaft extending along an axis from a first end adapted to be engaged to a power means for rotating the shaft to a second end defining a tip lying substantially on said axis;
- (b) a stabilizing point extending from said tip toward said first end, said stabilizing point including
- (i) first and second wall sections extending from said tip tapering outwardly at an acute angle relative to said axis in a direction toward said first end,
- (ii) a first cutting edge adjacent said first wall section and a second cutting edge adjacent said second wall section, said first cutting edge and said first leading edge lying on the same place, which plane is parallel to said axis, and
- (iii) a first flute between said first cutting edge and said second wall section and a second flute between said second cutting edge and said first wall section;
- and
- (c) a first land extending substantially radially outwardly from said first wall section and a second land extending substantially radially outwardly from said second wall section, said first land including a first leading edge defining a cutting edge and said second land including a second leading edge defining a cutting edge.
4 more elements
A bone drill comprising:
- (a) an elongated shaft extending along an axis from a first end adapted to be engaged to a power means for rotating the shaft to a second end defining a tip lying substantially on said axis;
- (b) a stabilized point extending from said tip toward said first end, said stabilizing point including
- (i) first and second wall sections extending from said tip tapering outwardly in a direction toward said first end, a section taken along said axis and through said first wall section and said second wall sections defining an angle between said first and second wall sections in the range of 60°±10°,
- (ii) a first cutting edge adjacent said first wall section and a second cutting edge adjacent said second wall section, and
- (iii) a first flute between said first cutting edge and said second wall section and a second flute between said second cutting edge and said first wall section;
- (c) a first land extending substantially radially outwardly from said first wall section and a second land extending substantially radially outwardly from said second wall section, said first land including a first leading edge defining a cutting edge lying on the same plane as said first cutting edge, said plane being substantially perpendicular to said axis and said second land including a second leading edge defining a cutting edge lying on the same plane as said second cutting edge, said plane being substantially perpendicular to said axis, said first leading edge being disposed 180° from said second leading edge, and
- (d) a first helical flute adjoining said first flute and a second helical flute adjoining said second flute said first and second helical flutes being separated by helical threads.
4 more elements
Dependencies are inferred from the claim text.