US 9,308,100 B2Granted

Intervertebral disc prosthesis with a motion-adapted edge for the lumbar and cervical spine

OwnerKarin Buettner-Janz, Eiko Buettnerinventors

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Abstract

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 different high edge regions preferably fluently merge. A significant advantage of the two part 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 transfer of load across a large surface area due to the spherical sliding surfaces, the maximal possible inclination of the sliding partners towards each other in a dorsoventral and laterolateral direction and/or the extent of axial rotation can, according to the invention, be defined through the wavelike design of the edge regions.

An intervertebral disc prosthesis for total replacement of the intervertebral disc within the lumbar or cervical spine, comprising an upper sliding partner adapted to firmly assemble to an upper vertebral body, a lower sliding partner adapted to firmly assemble to a lower vertebral body and a middle sliding partner located between the upper and lower sliding partners, wherein said upper, lower and middle sliding partners articulate with respect to each other, and wherein

a) the middle sliding partner has a spherical convexity on its upper and lower side, each convexity being surrounded by an edge which extends between a spherical transition area of each convexity and an outer rim of the upper and lower sides of the middle sliding partner, wherein at least one of the edges of the upper and lower sides of the middle sliding partner varies circumferentially in height around the respective convexity in a wavelike shape, wherein the height changes (i) seamlessly, (ii) in one or several steps or in a combination of (i) and (ii), and
b) the upper and lower sliding partners each have a concavity corresponding to the respective convexity of the upper and lower sides of the middle sliding partner, and the concavity of the upper sliding partner and the concavity of the lower sliding partner are each completely surrounded by an edge between a spherical transition area of each concavity and an outer rim of the upper and lower sliding partners, wherein at least one of said edges of the upper and lower sliding partners varies circumferentially in height around the respective concavity in a wavelike shape, wherein the height changes (i) seamlessly, (ii) in one or several steps or in a combination of (i) and (ii), and
c) said edges of the upper, lower and middle sliding partners together provide a defined maximal possible motion between the upper, lower and middle sliding partners in a ventral, dorsal and lateral direction and a fictitious vertical axis.

Facts

Application

11/379,086Filed 18 Apr 2006 · continuation in part

Priority

WO PCT/DE2004/00233218 Oct 2004

Published

US 2006/0235527 A119 Oct 2006

Granted

12 Apr 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

A61F 2/4425
Intervertebral or spinal discs, e.g. resilient: made of articulated components
A61F 2002/30616
Modular: sets comprising a plurality of prosthetic parts of different sizes or orientations
A61F 2002/30663
Ball-and-socket joints: multiaxial, e.g. biaxial; multipolar, e.g. bipolar or having an intermediate shell articulating between the ball and the…
A61F 2002/30841
Applied in original prostheses, e.g. holes or grooves: sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes

Abstract

Claims30