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
AssigneeStryker Ireland Ltd.
InventorsThomas Burke, Matteo Gubellini
Life of this patent
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Abstract
A bur with features that minimize the application of substantially identical forces to the tissue against which the bur is applied. One of these features is a single groove located in a single one of the flutes. The groove is formed in the flute so as to be spaced proximally away from the distal end tip of the bur head. Another feature is that, adjacent the distal end tip of the bur head, the clearance surfaces of the flutes extend outwardly different distances from the longitudinal axis through the bur head. Another feature is that the flutes extend in a helical pattern around the bur head and the angle of the helix varies along the longitudinal axis of the bur head.
Claims23
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 a distal end of said 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 a single one and only one of said flutes of said plurality of flutes is formed with a groove that extends from the rake surface to the clearance surface, wherein the groove is spaced proximally from the tip of said head so as to separate the cutting edge of said flute in which the groove is formed into a distal section located distal to the groove and a proximal section located proximal from the groove.
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 a most distal end 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 flutes of the first set of flutes project radially outwardly from the cutting edge of the flutes of the second set of flutes and
- wherein, a single one and only one of said flutes that collectively form the first set of flutes and the second set of flutes is formed with a single groove, the single said flute being formed in one of the flutes forming the first plurality of flutes and said flute being formed so that:
- the groove extends from the rake surface to the clearance surface of said flute;
- and the groove is spaced proximally from the tip of said head so as to separate the cutting edge of said flute into a distal section located distal to the groove and a proximal section located proximal from the groove.
Dependencies are inferred from the claim text.