Self-drilling self-tapping bone screw
OwnerRobin C. Whitmoreinventor
Life of this patent
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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.
Claims14
A self-drilling bone screw comprising:
- a body having:
- (a) a longitudinal centerline;
- (b) a head at a first end;
- and
- (c) a cutting end at a second end, the cutting end including a flat rectangular cutting surface oriented perpendicularly to the longitudinal centerline and having:
- (i) a first cutting edge which extends perpendicular from the longitudinal centerline to a first thread start point;
- and
- (iii) a second cutting edge which extends perpendicular from the longitudinal centerline to a second thread start point, the second cutting edge being parallel to the first cutting edge;
- and
- a dual lead thread extending outwardly from the body in a spiral path from the cutting end towards the head.
A self-drilling bone screw, comprising:
- a body having:
- (a) a longitudinal centerline;
- (b) a head at a first end;
- and
- (c) cutting edge including a flat rectangular cutting surface at a second end, the flat rectangular cutting surface oriented perpendicularly to the longitudinal centerline and having:
- (i) a first cutting edge which extends perpendicular from the longitudinal centerline to a first thread start point;
- and
- (iii) a second cutting edge which extends perpendicular from the longitudinal centerline to a second thread start point, the second cutting edge being parallel to the first cutting edge;
- and
- a dual lead thread extending outwardly from the body in a spiral path from the cutting end towards the head, the dual lead thread being multi-pitched such that the pitch of the thread:
- (a) is tapered towards the cutting end;
- and
- (b) transitions to a straight or slightly tapered thread towards the head.
A self-drilling, self-tapping bone screw, comprising:
- a body comprised of medical grade titanium alloy of approximately 1.0 to 2.0 mm in diameter and approximately 3.0 to 6.0 mm in length, the body having:
- (a) a longitudinal centerline;
- (b) a head at a first end;
- and
- (c) a cutting end comprising a flat rectangular cutting surface at a second end oriented perpendicularly to the longitudinal centerline and having:
- (i) a first cutting edge which extends perpendicular from the longitudinal centerline to a first thread start point;
- and
- (iii) a second cutting edge which extends perpendicular from the longitudinal centerline to a second thread start point, the second cutting edge being parallel to the first cutting edge;
- a dual lead thread extending outwardly from the body in a spiral path from the cutting end towards the head, the dual lead thread being multi-pitched such that the pitch of the thread is:
- (a) tapered towards the cutting end;
- and
- (b) transitions to a straight to slightly tapered thread towards the head;
- and
- a recess formed in the head configured to receive an end of an insertion tool.
Dependencies are inferred from the claim text.