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US 9,955,981 B2Granted
Surgical burs with localized auxiliary flutes
AssigneeMedtronic Xomed, Inc.
InventorsJohn W. Kulas, Donald E. Stearns
Life of this patent
Estimating the term…
Abstract
A surgical bur including primary flutes and auxiliary flutes. The primary flutes include (i) first clearance surfaces, and (ii) first rake surfaces with first cutting edges. The primary flutes extend from a proximal end of the surgical bur to a distal end of the surgical bur. The auxiliary flutes are localized in central regions or distal regions of the surgical bur. The auxiliary flutes include (i) second clearance surfaces, and (ii) second rake surfaces with second cutting edges. At least one of the auxiliary flutes is located between a pair of adjacent ones of the primary flutes.
Claims19
A surgical bur for use in cutting bone, comprising:
- a plurality of primary cutting flutes comprising (i) first clearance surfaces, and (ii) first rake surfaces having first bone cutting edges, wherein the plurality of primary flutes and the first bone cutting edges extend from a proximal end of the surgical bur to a distal end of the surgical bur;
- a plurality of auxiliary cutting flutes localized in central regions or distal regions of the surgical bur, wherein the plurality of auxiliary flutes comprise (i) second clearance surfaces, and (ii) second rake surfaces having second bone cutting edges, wherein at least one of the plurality of auxiliary flutes is located between a pair of adjacent ones of the plurality of primary flutes;
- and
- an equator that is a planar portion of the surgical bur that is perpendicular to an axis-of-rotation and where a diameter of the surgical bur is at a maximum, wherein the plurality of auxiliary flutes extend longitudinally over the equator and do not extend fully from the proximal end of the surgical bur to the distal end of the surgical bur;
- wherein the first bone cutting edges formed by the first rake surfaces and the second bone cutting edges formed by the second rake surfaces are configured to cut the bone.
2 more elements
A surgical bur for use in cutting bone, comprising:
- an equator that is a planar portion of the surgical bur that is perpendicular to an axis-of-rotation and where a diameter of the surgical bur is at a maximum;
- a plurality of primary cutting flutes comprising (i) first clearance surfaces, and (ii) first rake surfaces having first bone cutting edges;
- and
- a plurality of auxiliary cutting flutes comprising (i) second clearance surfaces, and (ii) second rake surfaces having second bone cutting edges, wherein at least one of the plurality of auxiliary flutes is located between a pair of adjacent ones of the plurality of primary flutes;
- and
- wherein the plurality of auxiliary flutes extend longitudinally over the equator and do not extend fully from the proximal end of the surgical bur to the distal end of the surgical bur;
- wherein the first bone cutting edges formed by the first rake surfaces and the second bone cutting edges formed by the second rake surfaces are configured to cut the bone.
4 more elements
A surgical bur for use in cutting bone, comprising:
- a plurality of primary cutting flutes comprising (i) first clearance surfaces, and (ii) first rake surfaces having first bone cutting edges, wherein at least one of the plurality of primary flutes having at least one first bone cutting edge extend from a proximal end of the surgical bur to a distal end of the surgical bur;
- and
- a plurality of auxiliary cutting flutes comprising (i) second planar clearance surfaces, and (ii) second planar rake surfaces having second bone cutting edges, wherein each of the plurality of auxiliary flutes is located between a pair of adjacent ones of the plurality of primary flutes, wherein at least one of the auxiliary flutes does not extend to the distal end of the surgical bur;
- and
- an equator that is a planar portion of the surgical bur that is perpendicular to an axis-of-rotation and where a diameter of the surgical bur is at a maximum, wherein the plurality of auxiliary flutes extend longitudinally over the equator and do not extend fully from the proximal end of the surgical bur to the distal end of the surgical bur;
- wherein the first bone cutting edges formed by the first rake surfaces and the second bone cutting edges formed by the second rake surfaces are configured to cut the bone.
3 more elements
Dependencies are inferred from the claim text.