Surgical bur with non-paired flutes
AssigneeMedtronic PS Medical, Inc.
InventorsJohn W. Kulas, Donald E. Stearns
Life of this patent
Estimating the term…
Abstract
A surgical dissection tool for cutting bone and other tissue includes a cutting head having an outer surface having non-paired or an odd number of flutes formed therein. Each flute includes a rake surface intersecting with the outer surface to form a cutting edge, and a relief surface opposite the rake surface. The relief surface and the rake surface form a first angle. Each flute also includes a leading angled surface extending from the relief surface to a distal end portion of the cutting head, the leading angled surface and the rake surface forming a second angle substantially the same as the first angle.
Claims17
A surgical dissection tool for cutting bone and other tissue, comprising:
- a distal end portion;
- a proximal end portion;
- a shank extending between the distal end portion and the proximal end portion,
- a cutting head at the distal end portion connected to the shank, the outer surface having an odd number of flutes formed therein, each flute comprising:
- a rake surface having at least a planar portion and intersecting with the outer surface to form a cutting edge, the planar portion is parallel to and offset from a reference plane through a longitudinal axis of the cutting head;
- a relief surface opposite the rake surface;
- and
- a leading angled surface extending from the relief surface to a distal end portion of the cutting head.
A surgical dissection tool for cutting bone and other tissue, comprising:
- a shank;
- a cutting head connected to the shank, the cutting head and shank having a central longitudinal axis and having a spherical outer surface with an odd number of flutes formed therein, each flute comprising:
- a planar rake surface intersecting with the spherical outer surface to form a cutting edge;
- a planar relief surface opposite the rake surface, the planar rake surface and the planar relief surface forming an obtuse angle;
- and
- a leading angled surface extending from the planar relief surface to a distal end portion of the outer surface,
- wherein the leading angled surface of at least one of the flutes includes a distal-most end extending past the longitudinal axis.
Dependencies are inferred from the claim text.