Calcar grinder

1. An apparatus for removing bone or tissue at a target location, comprising:

a shaft member having a drive end securable to a rotating drive unit; and

a cutting head member at a remaining end of the shaft member distal to the drive end;

wherein:

the cutting head member includes a cylindrical cutting head body having a cutting surface including a plurality of circumferentially extending radial recessed regions and a plurality of circumferential crests disposed between adjacent revolutions of the plurality of circumferential recessed regions, the cutting head body including a first head member end surface and a second head end surface spaced apart from the first head member end surface via a cylindrical edge region of the cutting head body, the second head end surface including the cutting surface;

the plurality of circumferential crests include a plurality of teeth thereon;

each circumferential recessed region is disposed at a distinct distance from a center of the second head member end surface; and

a central region of the cutting surface is recessed around a position coinciding with a primary longitudinal axis of the shaft member.

2. The apparatus as claimed in claim 1 , wherein the plurality of teeth are disposed along a common radius on the cutting surface.

3. The apparatus as claimed in claim 2 , wherein the plurality of teeth are disposed at or close to a predetermined radius from a central axis on the cutting surface.

4. The apparatus as claimed in claim 2 , wherein the plurality of teeth comprise a plurality of concentric teeth or teeth arranged concentrically.

5. The apparatus as claimed in claim 2 , wherein the plurality of teeth are arranged on multiple common concentric circles or on a spiral.

6. The apparatus as claimed in claim 1 , wherein the plurality of teeth protrude from a circular cutting surface at a distal end of the shaft member.

7. The apparatus as claimed in claim 1 , wherein a central recess is provided in the cutting surface.

8. The apparatus as claimed in claim 1 , wherein the plurality of teeth are spaced circumferentially around the cutting surface.

9. The apparatus as claimed in claim 1 , further comprising:

each of the plurality of teeth carries a plurality of secondary teeth.

10. The apparatus as claimed in claim 9 , wherein each primary tooth is spaced apart from each adjacent primary tooth via a radially extending channel.

11. The apparatus as claimed in claim 10 , wherein each channel comprises a radially extending elongate recess in the cutting surface.

12. The apparatus as claimed in claim 10 , wherein each channel meets the cutting surface at an oblique angle.

13. The apparatus as claimed in claim 12 , wherein the oblique angle is between 30 to 50 degrees with respect to a longitudinal axis associated with the shaft member.

14. The apparatus as claimed in claim 9 , wherein each secondary tooth comprises an upstanding leading edge that extends away from a plane associated with the cutting head member.

15. The apparatus as claimed in claim 9 , wherein each secondary tooth further comprises a trailing edge region that lies in a primary plane associated with the cutting surface.