Orthopedic Screw Fastener System Including Locking and Non-Locking Screws
An orthopedic screw fastener system which includes at least two screws and at least one bone plate. At least one screw is a locking screw comprising a screw head and a screw shank, the screw head being provided with a thread. At least one other screw is a non-locking screw comprising a non-threaded (i.e., smooth) screw head and a screw shank. The at least one bone plate has a thickness and it has at least two through-bores which are able to receive screws. The plate has two or more through-openings, each formed by at least two through-bores, each through-bore being defined by a midpoint and by a radius, and the through-bores are offset relative to each other and intersect each other in such a way that intersection lines and/or intersection surfaces extend into the depth of the through-opening.
1 . An orthopedic screw fastener system, comprising
at least one locking screw, comprising in each case a screw head and a screw shank, the screw head being provided with a thread,
at least one non-locking screw, comprising in each case a screw head and a screw shank, the screw head being non-threaded,
and
at least one plate, which has a suitable thickness, provided with at least two through-bores which are able to receive the screws,
wherein
the plate has at least two through-openings, each formed by at least two through-bores, each through-bore being defined by a midpoint and by a radius,
the through-bores are offset relative to each other and intersect each other in such a way that intersection lines and/or intersection surfaces extend into the depth of the through-opening.
2 . The screw fastener system as claimed in claim 1 , wherein the intersection surfaces and/or intersection surfaces extend in the longitudinal direction of the through-bores.
3 . The screw fastener system as claimed in claim 1 , wherein the midpoints of the through-bores are arranged on a common arc of a circle.
4 . The screw fastener system as claimed in claim 1 , wherein, in the case of three or more through-bores, these are offset relative to on another in such a way that each through-bore intersects all the other through-bores at least once.
5 . The screw fastener system as claimed in claim 1 , wherein at least one through-bore has a conical shape.
6 . The screw fastener system as claimed in claim 5 , wherein the through-bores narrow in the screwing-in direction.
7 . The screw fastener system as claimed in claim 5 , wherein, in the screwing-in direction of the through-opening, intersection lines are first provided, which merge into intersection surfaces.
8 . The screw fastener system as claimed in claim 1 , wherein a through-opening can be produced by producing a central bore with a radius about a midpoint M, and subsequent further through-bores that are arranged like a cloverleaf around the central bore.
9 . The screw fastener system as claimed in claim 1 , wherein the screw head is conical and narrows toward the screw shank.