Loading patent…
OwnerKarin Buettner-Janzinventor
Estimating the term…
The invention relates to an intervertebral disc prosthesis for the total replacement of a natural intervertebral disc within the lumbar and cervical spine, comprising articulating sliding partners, where the upper sliding partner has means for a firm assembly to an upper vertebral body and the lower sliding partner has means for a firm assembly to a lower vertebral body and at least one sliding surface that is between two sliding partners. According to the invention, functional two- and three part designs are planned and both prostheses have in common, that only a dorsoventral- and rotation movement is possible as a result of laterolaterally aimed, transversally arched, ventrally curved cylindrical convexity(ies) and corresponding concavity(ies), however without an inclination of the sliding partners in a lateral direction. In a further design, the cylindrical articulation surfaces are un-curved, enabling a motion of the sliding partners in only a ventrodorsal direction. According to the invention, the intervertebral disc prostheses are suited for an implantation from lateral and ventrolateral, particularly in revision surgeries.
Intervertebral disc prosthesis for total replacement of an intervertebral disc within a lumbar and cervical spine, comprising
Intervertebral disc prosthesis for total replacement of an intervertebral disc within a lumbar and cervical spine, comprising
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the sliding partners and the convexity(ies) and/or concavity(ies) as well as the surrounding edge comprise the same or different materials.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the surfaces of the sliding partners and/or to each other attached parts are coated equally or differently.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the maximal height of at Ireast one of the convexities is less than a semicylinder and/or the height of the edge is reduced, wherein, in the case of a three part intervertebral disc prosthesis, the height of the convexities is the same or differs on upper and lower side.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein a maximal aperture angle upon one-sided gap-closure of the sliding partners during extension or flexion is between 6 und 10 degrees with a tolerance of an additional 3 degrees in every direction.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the rotation around a fictitious central vertical axis between the neighboring sliding partners is slowed down for ventrally directed arched curvation of the convexity(ies) and concavity(ies), and a limited rotation motion between the sliding partners with respect to a fictitious central vertical axis of up to 3 degrees for the lumbar spine, and up to 6 degrees for the cervical spine to every side is possible, with a tolerance of an additional 2 degrees to every side.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the convexity(ies) and the respective corresponding concavity(ies) are dorsally displaced up to 4 mm away from a central sagittal section.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the edges of the sliding partners end outwardly perpendicular, otherwise angled, curved or a combination of straight, curved, and/or angular.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein surface and shape of an outer circumference of the upper and lower sliding partner are equal or unequal and can thereby be adapted to the corresponding size of the vertebral body to which they are to be assembled.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the upper and/or lower sliding partner are designed in such a way that in the frontal and/or sagittal view on outside and inside of the upper and/or lower sliding partners run parallel or non parallel relative to one another.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the convexity of a two part prosthesis and upper and lower side of the middle sliding partner of a three part prosthesis are parallel or non parallel with respect to a horizontal and thus run in a defined angle relative to each other, with the convexities being symmetrical or asymmetrical.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the transversal ventrally arched curvation of the convexity is designed symmetrically or asymmetrically from central to both lateral sides.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the upper and lower sliding partner are plane or convex and coated bio-actively or blunt on their outer surface and have for their primary anchorage with vertebral bodies special anchoring teeth, that are either arranged from dorsal to ventral straight or at an incline or in lateral direction, wherein in a respective dorsal row has only laterally arranged anchoring teeth.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the upper and/or lower sliding partner has means for an instrument to grip for implantation or explantation.
Intervertebral disc prosthesis according to at least one of the previous claims having a maximal breadth (frontal view) of 14 to 48 mm, a maximal depth (sagittal view) of 11 to 35 mm and a maximal height of 4 to 18 mm.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the transversal ventrally directed curvation of convexity and concavity equals zero.
Intervertebral disc prosthesis according to at least one of the previous claims suitable for implantation into a lumbar spine, and wherein an outer circumference of the upper and lower sliding partner tapers off ventrally in the transversal view.
Intervertebral disc prosthesis according to at least one of the previous claims suitable for implantation into a cervical spine, and wherein an outer circumference of the upper and lower sliding partner tapers off dorsally in the transversal view.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein non X-ray contrast giving parts of the prosthesis are each marked under their surface with one or more radiolucent tags.
Dependencies are inferred from the claim text.