Patent ID: 11883081
Assignee: RTG SCIENTIFIC, LLC
Field: Medical technology (Instruments)
Classification: CPC A  B | IPC A  B

Claim 16:
17. An implantable bone anchor comprising:
a shaft comprising:
a minor diameter;
a proximal end;
a distal end; and
a longitudinal axis;

a first helical thread disposed about the shaft along the longitudinal axis between the proximal and distal ends of the shaft, the first helical thread comprising:
a first concave undercut surface open toward the proximal end; and
a first convex undercut surface facing toward the distal end; and

a second helical thread disposed about the shaft adjacent the first helical thread, the second helical thread comprising:
a second concave undercut surface open toward the distal end, opposite the first concave undercut surface; and
a second convex undercut surface facing toward the proximal end, opposite the first convex undercut surface;

wherein, when the implantable bone anchor is viewed in section along a plane containing the longitudinal axis of the shaft:
a first interlocking space is formed intermediate the first concave undercut surface and the second concave undercut surface that extends to the minor diameter of the shaft;
a second interlocking space is formed intermediate the first convex undercut surface and the second convex undercut surface that extends to the same minor diameter of the shaft as the first interlocking space; and
at least one of:
the first helical thread does not have mirror symmetry with itself across any plane perpendicular to the longitudinal axis; and
the second helical thread does not have mirror symmetry with itself across any plane perpendicular to the longitudinal axis.