Abstract:
Instrumentation for implanting a cervical disc replacement device includes cervical disc replacement trials for determining the appropriate size of replacement device to be implanted, an insertion plate for maintaining the elements of the replacement device in fixed relation to one another for simultaneous manipulation, an insertion handle for attachment to the insertion plate for manipulation of the elements, an insertion pusher for releasing the insertion handle from the insertion plate, a drill guide that cooperates with the insertion plate to guide the drilling of tap holes for bone screws to be placed through bone screw holes in the flanges of the replacement device, clips that are applied to the flanges after placement of the bone screws to resist screw backout, a clip applicator for applying the clips to the flanges, a retaining device applied to the flanges after placement of the bone screws to resist screw backout and methods of applying each of the above.
Abstract:
An apparatus (100) for replacing at least a portion of an intervertebral disc in a spinal column includes: a first member (200) having a first vertebral contact surface (202) for engagement with an endplate of a first vertebral bone in the spinal column, and having a first saddle shaped articulation surface (212, 214); and a second member (300) having a second vertebral contact surface (302) for engagement with an endplate of a second vertebral bone in the spinal column, and having a second saddle shaped articulation surface (312, 314), wherein: an intervertebral disc space is defined substantially between the first and second endplates of the first and second vertebral bones, and the first and second articulation surfaces (212, 214, 312, 314) are sized and shaped to engage one another when the first and second members (200, 300) are disposed in the intervertebral disc space to enable the first and second vertebral bones to articulate in at least one of flexion, extension and lateral bending.
Abstract:
Instrumentation for implanting an artificial intervertebral disc includes static trials and a dynamic trial for determining the appropriate size of disc to be implanted, static trial holders (2060) for manipulating the static trials (1000), inserter/impactors for inserting and removing the static trials and for inserting the artificial intervertebral discs, repositioners/extractors for repositioning and extracting the static trials or the artificial intervertebral discs, and a leveler for setting the proper position of the artificial intervertebral disc. Methods for using the same are also disclosed. Features for artificial intervertebral discs and intervertebral spacer devices useful for manipulation by the instrumentation are also disclosed.
Abstract:
An intervertebral disc replacement trial (1200) includes a shaft (1202) having a handle at a proximal end (1206), and a head (1208) disposed at a distal end (1204) of the shaft. The head includes first and second surfaces (1210, 1212) that are spaced apart and sized for insertion into at least one intervertebral disc space defined by respective endplates of an adjacent pair of vertebral bones of a spinal column. The trial facilitates distraction of the vertebral bones in a direction along a longitudinal axis of the spinal column.
Abstract:
Apparatus and methods for preparing a disc space and inserting an intervertebral disc implant therein are disclosed. Among the various instruments disclosed are a midline marker (1000), a reference pin drill and insertion guide (1060), a fin drill guide (1314), a chisel guide (1450), a sizer (1508), a serrated broach (1636), an implant dispenser (1756), and an implant insertion tool (1800). Methods of utilizing these tools are also disclosed.
Abstract:
An artificial intervertebral implant (1) including a first baseplate (10) having a top surface (20), a bottom surface (22), an aperture (30) extending therethrough and a strap (34) attached to the bottom surface (22) of the first baseplate (10) and underlying the aperture (30). The implant (1) further includes a second baseplate (12) juxtaposed with the first baseplate (10). The second baseplate (12) includes a top surface (50) with a cavity (54) exposed therein. An articulating element (14) is attached to a pair of opposing sidewalls (58, 59) of the cavity (54) for retaining the strap (34) within the cavity (54).
Abstract:
An intervertebral device includes a first plate (10) having an outer face (12) and an inner face (18), and a second plate 30 juxtaposed with the first plate, the second plate having an outer face (32), an inner face (34) that opposes the first plate (10) and a concavity (38) that opposes the first plate (10). The device includes an elongated member (50) extending from the first plate (10) toward the second plate (30), the elongated member (50) having a distal end (54) with a spherical surface that is engageable with the concavity (38) of the second plate (30) for providing an articulating joint between the first and second plates. The device also includes a resilient member (60) in contact with the elongated member (50) for counteracting compressive loads on the plates, the resilient member (60) being surrounded by the concavity (38) of the second plate (30).