Self-drilling self-tapping bone screw
AssigneeSurgical Screw Concepts, LLC.
InventorRobin C. Whitmore
Life of this patent
Estimating the term…
Abstract
A self-drilling, self-tapping bone screw includes a body having a head at one end and a cutting end at an opposite end, the cutting end having a generally flat cutting surface supporting two symmetrical cutting edges which extend from the longitudinal centerline to diametrically opposed thread start points. A recess is formed in the head for receiving an end of an insertion tool. A dual lead thread extends outwardly from the body in a spiral path from the cutting end towards the head. The dual lead thread pitch is tapered towards the cutting end, and transitions to a straight or slightly tapered thread towards the head.
Claims19
A bone screw comprising:
- a body including a longitudinal centerline;
- a cutting end including a flat rectangular cutting surface oriented perpendicularly to the longitudinal centerline;
- and
- a dual lead thread extending outwardly from the body in a spiral path from the cutting end and ending at a head located opposite the cutting end.
A self-drilling bone screw comprising:
- a body including a longitudinal centerline;
- a cutting end including a flat rectangular cutting surface oriented perpendicularly to the longitudinal centerline;
- and
- a dual lead thread extending outwardly from the body in a spiral path from the cutting end and ending at a head.
A medical-grade surgical screw comprising:
- a head;
- a body including a longitudinal centerline;
- a cutting end including a flat rectangular cutting surface oriented perpendicularly to the longitudinal centerline;
- and
- a dual thread comprising a first thread originating from a first side of the flat rectangular cutting surface and a second thread originating from a second side, opposite the first side, of the flat rectangular cutting surface and wherein a pitch of the first thread and the second thread gradually decreases as the first thread and the second thread spiral from the cutting surface towards the head.
Dependencies are inferred from the claim text.