Surgical burs with decoupled rake surfaces and corresponding axial and radial rake angles

Patent metadata

Field	Value
Publication number	US-10335166-B2
Application number	US-201514664258-A
Country	US
Kind code	B2
Filing date	Mar 20, 2015
Priority date	Apr 16, 2014
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A surgical bur including flutes and lands. Each of the flutes includes a cutting edge, rake surfaces and a clearance surface. The rake surfaces of one of the flutes are decoupled from each other. Each of the lands is disposed between a pair of the flutes.

First claim

What is claimed is:

1. A surgical bur comprising:
a plurality of flutes, wherein each of the plurality of flutes comprises a cutting edge;
a plurality of rake surfaces;
a planar clearance surface,
wherein the plurality of rake surfaces of one of the flutes comprises
a first rake surface having a first rake angle and a first distinct planar surface, and
a second rake surface having a second rake angle and a second distinct planar surface, wherein the second rake angle is decoupled from the first rake angle, and wherein the first rake surface and the second rake surface are distinct from the planar clearance surface; and

a plurality of lands, wherein each of the plurality of lands is disposed between a pair of the plurality of flutes;
wherein:
the first rake surface of the one of the flutes has a negative axial rake angle; and
the second rake surface of the one of the flutes has a positive radial rake angle.

2. The surgical bur of claim 1 , wherein:
the first rake surface of the one of the flutes and a first corresponding portion of one of the cutting edges are configured for drilling in a direction parallel or along a longitudinal axis of the surgical bur; and
the second rake surface of the one of the flutes and a second corresponding portion of the one of the cutting edges are configured for cutting in a radial or lateral direction relative to the longitudinal axis of the surgical bur.

3. The surgical bur of claim 1 , wherein the plurality of rake surfaces of the one of the plurality of flutes are decoupled from each other.

4. The surgical bur of claim 1 , wherein:
the first rake surface has a first vertex and a first corresponding portion of one of the cutting edges, wherein a depth of the first rake surface increases in size from a distal end of the first rake surface to the first vertex; and
the second rake surface has a second vertex, wherein a depth of the second rake surface increases in size from the second vertex to (i) an equator of the surgical bur, (ii) a proximal end of the second rake surface, (iii) a proximal end of the surgical bur, or (iv) a proximal end of the one of the plurality of flutes.

5. The surgical bur of claim 1 , wherein:
one of the plurality of flutes comprises a decoupling area; and
the decoupling area is located between the first rake surface and the second rake surface.

6. The surgical bur of claim 1 , wherein:
each of the plurality of flutes comprises a respective decoupling area; and
each of the decoupling areas is located between two of the plurality of rake surfaces of the respective one of the plurality of flutes.

7. The surgical bur of claim 1 , wherein:
the plurality of flutes comprise respective first rake surfaces and respective second rake surfaces, wherein, for each of the plurality of flutes, the first rake surface meets the second rake surface at a respective point;
each of the second rake surfaces comprising a respective vertex; and
wherein, for each of the plurality of flutes, a proximal point or end of each of the first rake surfaces is at the respective vertex of the corresponding second rake surface.

8. The surgical bur of claim 1 , further comprising a drill point comprising a plurality of axial relief surfaces, wherein each of the plurality of axial relief surfaces borders (i) a distal portion of a respective one of the cutting edges, (ii) a respective one of the lands, and (iii) a respective one of the planar clearance surfaces.

9. A surgical bur comprising:
a plurality of flutes, wherein each of the plurality of flutes comprises a cutting edge, a plurality of rake surfaces and a planar clearance surface,
wherein
the plurality of rake surfaces of one of the plurality of flutes includes at least a first rake surface and a second rake surface,
the first rake surface has a first distinct planar surface,
the second rake surface has a second distinct planar surface,
the first rake surface and the second rake surface are decoupled from each other, and
the first rake surface and the second rake surface are distinct from the planar clearance surface; and

a plurality of lands, each of the plurality of lands is disposed between a pair of the plurality of flutes;
wherein the one of the plurality of flutes comprises:
the first rake surface having a first axial angle; and
the second rake surface having a second axial angle,
wherein one of the first axial angle and the second axial angle is a positive axial angle relative to a longitudinal axis of the surgical bur, and wherein the other one of the first axial angle and the second axial angle is a negative axial angle relative to the longitudinal axis.

10. The surgical bur of claim 9 , wherein the plurality of rake surfaces of the one of the plurality of flutes comprises:
the first rake surface; and
the second rake surface having a different rake angle than the first rake surface.

11. The surgical bur of claim 10 , wherein the first rake surface or the second rake surface has a plurality of radial rake angles.

12. The surgical bur of claim 10 , wherein each of the first rake surface and the second rake surface has a plurality of radial rake angles.

13. The surgical bur of claim 10 , wherein the first rake surface or the second rake surface includes a negative radial rake angle, a neutral radial rake angle and a positive radial rake angle.

14. The surgical bur of claim 10 , wherein:
the first rake surface or the second rake surface comprises a plurality of radial rake angles; and
the plurality of radial rake angles have different vertices.

15. The surgical bur of claim 9 , wherein each of the plurality of lands is convex-shaped.

16. The surgical bur of claim 9 , wherein:
the plurality of rake surfaces of each of the plurality of flutes are decoupled from each other;
each of the plurality of flutes comprises a respective decoupling area; and
each of the decoupling areas is located between two of the plurality of rake surfaces of the corresponding one of the plurality of flutes.

17. The surgical bur of claim 9 , wherein the plurality of rake surfaces of each of the plurality of flutes meet at a respective point.

18. The surgical bur of claim 9 , wherein the plurality of rake surfaces of each of the plurality of flutes comprises:
the first rake surface; and
the second rake surface comprising a vertex,
wherein, for each of the plurality of flutes, a proximal point or end of each of the first rake surfaces is at the respective vertex of the corresponding second rake surface.

19. The surgical bur of claim 9 , wherein the plurality of rake surfaces in each of the plurality of flutes are in respective planes and are at different angles relative to a longitudinal axis of the surgical bur.

20. The surgical bur of claim 9 , wherein:
the first axial angle is a negative axial rake angle;
the second axial angle is a positive axial rake angle; and
the second rake surface is proximal to the first rake surface.

21. The surgical bur of claim 9 , further comprising a drill point comprising a plurality of axial relief surfaces, wherein each of the plurality of axial relief surfaces borders (i) a distal portion of a respective one of the cutting edges, (ii) a respective one of the lands, and (iii) a respective one of the planar clearance surfaces.

22. The surgical bur of claim 21 , wherein each of the plurality of axial relief surfaces has a planar area and is distinct from the lands.

23. The surgical bur of cl

Assignees

• Medtronic Ps Medical Inc
• Medtronics Ps Medical Inc

Inventors

• Kulas John W
• Stearns Donald E

Classifications

• A61B17/1615 Primary

  Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material · CPC title

• B23C5/1009

  Ball nose end mills · CPC title

• B23C2210/0407

  Cutting angles · CPC title

• B23B2251/00

  Details of tools for drilling machines · CPC title

• B23C2210/0428

  axial rake angle · CPC title