Abstract:
A visco-elastic facet joint implant for insertion into a facet joint between an inferior facet formed on a superior vertebral body and a superior facet formed on an inferior vertebral body. The facet implant includes a visco-elastic implant element molded into an anatomically fitted shape to optimally fit between the facet joint and one or more bone fixation elements to secure the visco-elastic implant element to the superior and/or inferior vertebral bodies. In use, the visco-elastic facet joint implant includes a first end for engaging the superior vertebral body, a middle portion for passing through the facet joint and an optional second end for engaging the inferior vertebral body.
Abstract:
A flexible dampening intervertebral spacer (100) to replace a spinal disc comprising upper and lower plates (101,103), an articulation element (102) and optional intermediate members (804,805). The articulation element has a plurality of interposed, concentric ring shaped segments (202) separated by one or more spaces (201) and one or more bridging elements (203) connecting the interposed segments. A first portion of the articulation element, preferably an innermost segment, is preferably fixedly connected to the upper plate while a second portion of the articulation element, preferably the outermost segment, is preferably connected to the lower plate to permit relative movement of the endplates by elastic deflection or flexing of the articulation element without opposed surfaces rubbing against each other.
Abstract:
A spine retractor and distractor device comprises spinal process clamps and a retractor assembly, which may be rotatably coupled with the spinal process clamps. The retractor assembly may include a retractor ring, or frame, and a plurality of retractor blades adjustably coupled to the frame, e.g., by clamps. The spinal process clamps can maintain a grip on the spinal processes of the patient, and distraction pliers may be used to impart a distraction force on the spinal process clamps to distract the spinal segments. Additionally, other components, features, or tools, e.g., a light source and/or a camera, can be mounted on the instrument.
Abstract:
A bone screw (1) is used for locking an articular facet between the superior and inferior articular processes of two vertebral bodies and is provided with a threaded shaft (2), a screw head (3) and a central axis (4). The screw head (3) is further provided with a number of grooves (5) on the periphery of the screw head (3) which run essentially parallel to said central axis (4).
Abstract:
An intervertebral implant includes a three-dimensional body and a securing plate. The three-dimensional body includes a front surface and a rear surface. The three-dimensional body further includes a plurality of boreholes for accommodating fixation elements. The intervertebral implant also includes a front plate disposed at the front surface of the three-dimensional body and having a plurality of boreholes. A securing plate can be fastened to the front plate.
Abstract:
An anterior transpedicular bone fixation device (100) includes a first plate (105) having at least one fastener hole (120a) configured to receive at least a portion of a first bone fastener and a first rotatable eccentric member (112). The first eccentric member has a first aperture (106) for receiving at least a portion of a central fastener (108). A second plate (110) has at least one fastener hole (120c) configured to receive at least a portion of a second bone fastener and a second rotatable eccentric member (114) with a second aperture (107) for receiving at least a portion of the central fastener, wherein the first and second rotatable eccentric members enable the first plate and second plate to translation with respect to one another. The orientation of the first plate with respect to the second plate can be fixed by advancing the central fastener through the apertures.
Abstract:
An implant for an intervertebral space with a shaped body. The implant has a top contact surface to be placed on a base plate of a body of the vertebra adjoining the implant from above, a bottom contact surface to be placed on a cover plate of a body of the vertebra adjoining the implant from below, two lateral surfaces, a front lateral and a rear lateral surface as well as a central axis that intersects the two contact surfaces, a longitudinal axis that intersects the front and rear lateral surfaces and a transverse axis that intersects the lateral surfaces. The implant also has a central plane situated between the contact surfaces and at right angles to the central axis of the body. The contact surfaces have a plurality of macroscopic teeth with central axes, where the central axes of the plurality of teeth are inclined relative to the central plane in such a manner, that a rotation of the body of 90° about the longitudinal axis is facilitated in one direction and impeded in the other direction. The distance between the two lateral surfaces is smaller than the distance between the two contact surfaces.
Abstract:
An intervertebral implant for mounting between superior and inferior vertebrae includes first and second endplates and an inlay. The first endplate has a first vertebra engagement surface and a first inner surface. The first vertebra engagement surface is mounted to the superior vertebra in an implant positions. The second endplate has a second vertebra engagement surface and a second inner surface. The second vertebra engagement surface is mounted to the inferior vertebra in the implanted position. The inlay is mounted to and between the first and second inner surfaces in an assembled configuration. The inlay includes a first mounting plate, a second mounting plate, a first W-shaped spring and a second W-shaped spring. The first and second W-shaped springs are mounted between the first and second mounting plates. The first and second W-shaped springs have longitudinal axes that are generally parallel to the insertion axis.
Abstract:
An intervertebral implant having a three-dimensional body (10) and a securing plate (1). The three-dimensional body (10) includes an upper side (1) and an underside (2) which are suitable for abutting the end plates of two adjacent vertebral bodies, a left side surface (3) and a right side surface (4), a front surface (5) and a rear surface (6), a horizontal middle plane (7) between the upper side (1) and the underside (2), and a vertical middle plane (12) extending from the front surface (5) to the rear surface (6). The three-dimensional body further includes a plurality of boreholes (9a) passing through the body (10), which are suitable for accommodating longitudinal fixation elements (20). The intervertebral implant also includes a front plate (8) displaceably disposed as an insert with the front side (5) of the three-dimensional body, the front plate (8) having a plurality of boreholes (9) in which the longitudinal fixation elements (20) can be anchored, and whose openings overlap with the openings of the boreholes of the three-dimensional body (10). A securing plate can be fastened essentially parallel to the front plate (8) at the three-dimensional body (10) in such a manner that the boreholes of the front plate (9) are covered at least partly by the securing plate (18). By virtue of the configuration of the intervertebral implant, a rigid, firm connection between the intervertebral implant and the longitudinal fixation elements used to fasten it, is possible.
Abstract:
The total disc replacement device (1) comprising a central axis (2), a first and a second apposition plate (3; 5), a first and a second joint component (4; 6) being mutually arranged in a ball joint like manner and being located between said first and second apposition plates (3; 5) and intermediate means (7) being disposed at least between the first apposition plate (3) and the first joint component (4) in such manner that, the first joint component (4) is not freely moveable transversely to the central axis (2) with respect to the first apposition plate (3) under load-free conditions, but a limited movement of the first joint component (4) relative to the first apposition plate (3) transversal to the central axis (2) is allowed under load.