Dynamic disc assembly
AssigneeInstitute for Musculoskeletal Science and Education, Ltd.
InventorsJames A. Sack, Seth Anderson, John Peloza
Life of this patent
Estimating the term…
Abstract
A dynamic disc assembly has a superior end plate, an inferior end plate, and a core. The core has surfaces of an annular Fresnel shape and a linear Fresnel-like shape combined to control the dynamic range of motion (ROM) movement arranged to match anatomical ROM. The core is interposed between and held against interior surfaces of the superior end plate and the inferior end plate. The assembly further has a pair of coupling cords, one coupling cord at each lateral end of the superior and inferior end plates wherein each lateral end of each end plate has one or more cord connections attached and affixed to the coupling cord to form and retain the dynamic disc assembly.
Claims23
A dynamic disc assembly comprises;
- a superior end plate;
- an inferior end plate;
- a core interposed between and held against interior surfaces of the superior end plate and the inferior end plate;
- and
- wherein the core has an inferior surface being an annular Fresnel lens shaped surface configured to articulate about a complimentary Fresnel lens shaped surface of the interior surface of the inferior end plate, wherein a clearance between the inferior surface of the core relative to the interior surface of the inferior end plate allows for articulating range of motion (ROM) movements in any direction of rotation, wherein the annular Fresnel lens shaped surface of the core forms ROM stops limiting angular movement.
A dynamic disc assembly comprises;
- a superior end plate;
- an inferior end plate;
- a core interposed between and held against interior surfaces of the superior end plate and the inferior end plate;
- and
- wherein the core has a superior, linear Fresnel like shaped surface configured to articulate in an anterior and posterior direction, but not a lateral direction;
- wherein the superior end plate includes a complimentary linear Fresnel like shaped surface;
- wherein a clearance between the superior surface of the core relative to the interior surface of the superior end plate allows for an articulating range of motion (ROM) anteriorly and posteriorly wherein the linear Fresnel like shaped surface of the core forms ROM stops limiting the posterior and anterior articulation of the superior end plate relative to the core and prevents lateral articulation.
Dependencies are inferred from the claim text.