Back to results
US 8,282,672 B2Granted
Frictional screw-rod connection having an indirect form-locking portion
AssigneeBird Biedermann AG
InventorStefan Freudiger
Life of this patent
Estimating the term…
Abstract
A spinal column implant for elastic stabilization of vertebrae, includes a pedicle screw and an elastic rod which is anchored in a frictional fashion in a receptacle of pedicle screws by means of a filling piece, and a clamping element. The frictional connection is supported additionally by an indirect form-fit portion.
Claims28
A spinal column implant comprising:
- an elastic connection element formed from a plastic material and extending along a longitudinal axis, the connection element having a constant cross-section along the longitudinal axis;
- a plurality of bone anchoring elements, each bone anchoring element having a head portion defining a receptacle for the connection element, a filling piece configured to be located in the receptacle, and a clamping element, wherein the filling piece and the head portion have opposed seats that define a space therebetween in the receptacle configured to receive the connection element;
- wherein the clamping element is securable to the head portion to clamp a portion of the connection element in the space into a clamped position;
- wherein the seat of the filling piece defines a recess entirely through the filling piece such that the elastic connection element passes entirely through the filling piece when the elastic connection element and the filling piece are located in the receptacle of the bone anchoring element and the elastic connection element is seated in the recess;
- wherein at least one of a contour of the seat of the filling piece and a contour of the seat of the head portion deviate from a contour of the connection element;
- wherein the seats are movable relative to each other between a non-clamped position wherein both seats contact the connection element over a first surface area and the clamped position, closer together, wherein the seats contact the connection element over an increased surface area and the connection element is elastically deformed in the space between the seats;
- and
- wherein the elastic connection element permits movement of the plurality of bone anchoring elements relative to each other.
5 more elements
A spinal column implant comprising:
- a plastically deformable connection element formed from a plastic material and extending along a longitudinal axis, the connection element having a constant cross-section along the longitudinal axis;
- and
- a bone anchoring element comprising a head portion defining a receptacle configured to receive a section of the connection element, a filling piece configured to be located in the receptacle, and a clamping element, wherein the filling piece and the head portion have opposed seats that define a space therebetween in the receptacle configured to receive the connection element, and wherein the clamping element is configured to clamp the section of the connection element in the space into a clamped position;
- wherein the seat of the filling piece defines a recess entirely through the filling piece such that the elastic connection element passes entirely through the filling piece when the elastic connection element and the filling piece are located in the receptacle of the bone anchoring element and the elastic connection element is seated in the recess;
- wherein at least one of a contour of the seat of the head portion and a contour of the seat of the filling piece deviate from a contour of the connection element;
- wherein the seats are movable relative to each other between a non-clamped position wherein both seats contact the connection element over a first surface area and the clamped position, closer together, wherein the seats contact the connection element over an increased surface area and the connection element is elastically deformed in the space between the seats, and
- wherein the elastic connection element permits movement of a plurality of bone anchoring elements relative to each other.
4 more elements
Dependencies are inferred from the claim text.