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OwnerKarin Buettner-Janz, Eiko Buettnerinventors
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The invention relates to an intervertebral disc prosthesis for the total replacement of the intervertebral disc within the lumbar and cervical spine. For a two part as well as for a three part intervertebral disc prosthesis, according to the invention, in accordance to the design of the edges of the sliding partners, there are aspects for at least one of the sliding partners, in which there is an wavelike design of the edge, as the respectively differently high edge regions preferably fluently merge. A significant advantage of the two intervertebral disc prostheses, according to the invention, compared to the present state of the art of already known prostheses, is that as a result of a central transfer of load across a large surface area due to the spherical sliding surfaces, the maximally possible inclination of the sliding partners towards each other in a dorsoventral and laterolateral direction and/or the extent of rotation can, according to the invention, be defined through the wavelike design of the edge region.
Intervertebral disc prosthesis for total replacement of the intervertebral disc within the lumbar and cervical spine, comprising of articulating sliding partners, wherein the upper sliding partner firmly assembles to an upper vertebral body and the lower sliding partner firmly assembles to a lower vertebral body and an in-between the sliding partners located sliding area, wherein
Intervertebral disc prosthesis for total replacement of the intervertebral disc within the lumbar and cervical spine, comprising of articulating sliding partners, wherein the upper sliding partner firmly assembles to an upper vertebral body and the lower sliding partner firmly assembles to a lower vertebral body and wherein between the upper and lower sliding partner a further, middle sliding partner is located, corresponding with the inner surfaces of the upper and lower sliding partners in such a way that an upper and a lower sliding area is formed, wherein
Intervertebral disc prosthesis according to at least one of the above claims, wherein as the result of the wavelike shape of at least one edge of a one of the sliding partners the maximal possible motion of the sliding partners towards each other is always larger in dorsoventral direction than in laterolateral direction.
Intervertebral disc prosthesis according to at least one of the above claims, wherein as the result of the wavelike edge design of at least one edge a greater inclination of the sliding partners towards each other in ventral direction results than in a dorsal direction.
Intervertebral disc prosthesis according to at least one of the above claims, wherein the maximal possible angle of inclination (aperture angle) of the sliding partners depends on
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the sliding partners are constructed in one piece.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the sliding partners and/or to each other attached parts comprise the same or different materials.
Intervertebral disc prosthesis according to at least one of the previous claims, with 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 the convexity is less than a hemisphere and/, if an edge is present, a height of the edge is reduced, and, for a three-part intervertebral disc prosthesis, a height of the convexities of the middle sliding partner is equal or different on the upper and lower side.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the maximal aperture angle upon gap-closure of the sliding partners on one side during extension or flexion is between 6 und 10 degrees and at lateral gap-closure between 0 und 6 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 shape of the edges allows for a limited rotational motion of the sliding partners with respect to a fictitious vertical axis of, up to 3° for the lumbar spine and of up to 6° for the cervical spine to every side, with a tolerance of an additional 2 degrees to each side.
Intervertebral disc prosthesis according to at least one of the previous claims, where the convexity(ies) and the respective corresponding concavity(ies) are dorsally displaced up to 4 mm away from a mediosagittal 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 above 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 above claims, wherein upper and/or lower sliding partners are constructed in such a way that in frontal and/or sagittal view an outside and inside of the upper and/or lower sliding partner run parallel or non parallel.
Intervertebral disc prosthesis according to at least one of the above claims, wherein the convexity of a two part prosthesis and the 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 convexity(ies) being symmetrical or asymmetrical.
Intervertebral disc prosthesis according to at least one of the previous claims, wherein the upper and lower sliding partner are on their outer surface plane or convex and coated bio-actively or bluntly and have for their primary anchorage with vertebral bodies rows of anchoring teeth, that are either arranged from dorsal to ventral laterally straight or at an incline or ventral and dorsal in lateral alignment, and in the wherein the 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 have 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 prosthesis is marked under its surface with one or more radiolucent tags.
Dependencies are inferred from the claim text.