Orthopedic systems and methods for installing an implant and/or boring a bone bicortically. The system may include a drill having a proximal boring portion configured to bore a larger hole in a bone more efficiently when the drill rotates in a first direction compared to an opposite second direction, and a distal boring portion configured to bore a smaller hole in the bone more efficiently when the drill rotates in the second direction. The implant may be configured to be implanted at least partially in the bone, such that a first region of the implant is located in the larger hole and a second region of the implant is located in the smaller hole. In an exemplary method, the larger hole and the smaller hole may be bored in the bone's near cortex and far cortex, respectively, by a shaft and a nose of the drill rotated in opposite directions.

The invention relates to a single-lip drill with an inner and an outer rake face. Very good hole straightness deviation values and endurance are obtained with the ground face according to the invention.

Cutting elements may include points, tips, cutting portions and/or shafts of various geometries depending on requirements of the intended use. Tip geometries described may be used for cutting burrs, k-wires and/or drill bits in many types of applications. In particular, the tip geometries described may be used in medical applications. For example, tip geometries as described herein may be used for drilling bones, cartilage, and similar structures during surgery. Tip geometry may influence cutting ability. Use of the tip geometries described may allow the cutting element to be positioned at varying angles relative to the surface to be cut. In some instances, a tip geometry for a cutting element may be selected such that it reduces and/or inhibits movement of the cutting element during use and/or allows for a predetermined angle of entry into a surface to be cut. Using the designs described herein may reduce and/or inhibit damage, heat, and/or trauma to materials that are to be cut, for example, tissues such as bone and/or cartilage.

A drill may include a body which is extended along a rotation axis from a first end to a second end. The body may include a first cutting edge, a second cutting edge, a thinning surface, a flute, and an outer peripheral surface. The outer peripheral surface may include a first margin surface, a clearance surface, and a second margin surface. In a plan view of the first end, an imaginary straight line connecting the rotation axis and an end part on a side of an outer periphery in the first cutting edge may be a first straight line, and an imaginary straight line which passes through a center of the first straight line and is orthogonal to the first straight line may be a second straight line. The second straight line may intersect with the second margin surface.

A ridgeline between the thinning face and the flank face includes a first thinning portion contiguous to the outer cutting edge, and a second thinning portion contiguous to the first thinning portion. When viewed in a direction along the central axis, the first thinning portion is linear and the second thinning portion is curved. When viewed in the direction along the central axis, the first thinning portion, and a boundary between the first thinning portion and the second thinning portion are located rearward in a rotational direction relative to a first straight line, and are located forward in the rotational direction relative to a second straight line, the first straight line being a straight line passing through the central axis and parallel to the first thinning portion, and the second straight line being a straight line perpendicular to the first straight line.

A twist drill and an exchangeable head for a twist drill, the twist drill extending along a central axis of rotation and having a front end formed as a drill point with two cutting edges and at least two clearance surfaces. Two helical chip flutes conduct chips away from the cutting edges. Each cutting edge extends in a transition between the clearance surfaces. One of the chip flutes extends from an inner position adjacent to the central axis to a peripheral envelope surface and has a main portion closest to the peripheral envelope surface. Each chip flute is delimited by a side surface including a main rake face, which extends rearward from the main portion of the cutting edge. The cutting edges are contained in an imaginary conical surface, such that the twist drill is operable to generate a bottom profile having the shape of an inverted cone.

A long twist drill includes a shank and a drill body having a drill tip (16). The twist drill has a length L and an outer diameter D, and has a cemented carbide or high speed steel substrate and a coating of at least one layer. The quota L/D is at least 16. The twist drill has two cutting segments at the tip and two flutes chip. The twist drill is provided with holes for fluid opening in the tip. The twist drill has an axial web thinning angle GAA, which is 40 to 50°. The twist drill further has a web that back tapers such that a web diameter gets smaller in a direction away from the tip towards the shank within an axial distance.

An alloy tool bit twist drill, comprising a tool shank, a spiral tool body and an alloy tool bit . A groove is milled on a spiral cutting surface of the spiral tool body, the alloy tool bit is integrally arranged on the spiral cutting surface, the spiral cutting surface and a cutting surface of the alloy tool bitare arranged in the same groove, and a central stepped platform is arranged on the cutting surface near the axis center of the alloy tool bit. A central stepped surfaceis arranged on the inner side of the central stepped platform protruding in the rotating direction; or a branch hole table and a branch cutting surface are concavely arranged on the cutting surface of the alloy tool bitin a stepwise manner.

A drill bit has a tool shank, a center axis, a first cutting region with at least one geometrically defined first cutting edge, the same having a cutting face arranged at a radial distance from the center axis of the drill bit. The first cutting edge forms a countersink angle with the center axis. The drill bit having a chip shaping stage functionally assigned to the first cutting edge formed by the cutting face of the first cutting edge and by a shoulder surface adjoining the cutting face and forming a shoulder angle with the same, wherein the shoulder angle is greater than 90°, and preferably greater than 100°. The cutting face runs at a radial rake angle with respect to an imaginary radial line which cuts the first cutting edge, the same functionally assigned to the cutting face. The radial rake angle is positive.

A drill is provided with a body having a rod shape configured to rotate about a rotational axis, a cutting edge that is located at a tip portion of the body and extends from an outer periphery of the body toward the rotational axis when viewed from the tip portion, a flank located at the tip portion and disposed along the cutting edge, a covering layer that covers at least the tip portion of the body, and one or more recessed portions disposed on the flank at positions close to the cutting edge.