Surgical bur with plural flutes and a groove, the groove formed in a single one of the flutes and spaced away from the distal end of the bur

A bur for surgical/medical use, said bur including;

• a shaft having opposed proximal and distal ends, said shaft having a proximal section adjacent the proximal end shaped for coupling to a surgical handpiece capable of rotating said shaft;
• and
• a head attached to the distal end of said shaft, said head having:
• a tip that is the most distal portion of the head;
• a longitudinal axis that extends proximally from the tip through said bur head;
• and a plurality of flutes, each said flute having a rake surface and a clearance surface, the rake surface and clearance surface meeting at a cutting edge, wherein said head is further formed to have:
• a first set of a plurality of flutes with clearance surfaces that, adjacent the bur head tip, are located a first acute angle relative to the longitudinal axis of said bur head;
• and
• a second set of a plurality of flutes, wherein the flutes forming the second set of flutes are formed with clearance surfaces that, adjacent the bur head tip, are located a second acute angle relative to the longitudinal axis of said bur head, the second acute angle being less than the first acute angle so that in a common plane perpendicular to the longitudinal axis of the bur head, the cutting edges of the first of the first set of flutes extend radially outwardly from the cutting edge of the flutes of the second set of flutes;
• and
• a single groove, the groove being formed in a single one of said flutes forming the first pair of flutes, that extends from the rake surface to the clearance surface, wherein the groove is spaced proximally from the tip of said head so as separate the cutting edge of the said flute in which said groove is formed into a distal section located distal to the groove and a proximal section located proximal from the groove.