Mounting devices for fixation devices and insertion instruments used therewith
View Patent ↗A vertebral cleat and a vertebral support system employing the vertebral cleat is provided. Preferably, the vertebral cleat includes a base member having a superior and an inferior surface; an elongate keel portion having a cutting edge thereon depending from the inferior surface of the base member; and a spike portion depending from the inferior surface of the base member, the spike portion having a height that is greater than a height of the elongate keel portion. There is also provided a tool for grasping and implanting the vertebral cleat in a plurality of insertion configurations.
1. A vertebral cleat for being secured to vertebral bone, the vertebral cleat comprising:
a base member having a superior surface and an inferior surface;
a hole extending through the base member for receiving an anchor member therethrough;
an elongate keel portion connected to and extending from the inferior surface of the base member and having a cutting edge thereon;
a projection portion integral to the elongate keel and extending from the inferior surface of the base member in an axial direction and centrally relative to the elongate keel, the projection portion having a base end connected to the base member inferior surface and a tip end extending past the cutting edge of the keel portion and configured to penetrate the bone prior to the elongate keel portion to allow the base member to be rotated thereabout after penetration of the tip end of the projection portion for positioning of the base member hole in a desired location relative to the bone;
the cutting edge of the elongate keel having either a serrated or knife edge configuration that is the same on either side of the projection portion for penetrating the bone when an impact force is applied to the base member superior surface;
opposite side surfaces of the elongate keel portion, with the elongate keel portion having a thickness between the opposite side surfaces that is narrower than the base end of the projection portion; and
a curved surface of the projection portion extending thereabout tapering in the axial direction and sized so that the projection portion extends beyond the keel side surfaces from the cutting edge of the keel portion to the projection base end.
2. The vertebral cleat of claim 1 , wherein the elongate keel portion defines at least one window extending therethrough that allows bone growth through the elongate keel portion when implanted in a vertebral bone.
3. The vertebral cleat of claim 1 , further comprising a second hole extending through the base member and wherein a central axis of the hole and a central axis of the second hole are canted relative to each other.
4. The vertebral cleat of claim 1 , further comprising a recess defined in a perimeter edge of the base member, the recess sized and configured to receive a portion of an insertion tool.
5. The vertebral cleat of claim 1 , wherein the base member has a curvature such that the inferior surface conforms to a bone surface.
6. A vertebral support system comprising:
first and second spaced vertebral cleats each comprising a base member with an inferior surface and a superior surface and having a perimeter edge extending therearound, a pair of openings extending through the base member, an elongate keel having a cutting edge thereon depending from the base member inferior surface and extending therealong and having opposite ends arranged such that the keel at the opposite ends thereof does not extend beyond the openings toward the perimeter edge, and a spike depending from the base member inferior surface and integral to the elongate keel, the spike having a height that is greater than a height of the elongate keel;
a pair of anchor members with one of the anchors members extending through one of the openings in the first vertebral cleat and the other anchor member extending through one of the openings in the second vertebral cleat; and
an elongate member extending between the pair of spaced vertebral cleats, the elongate member having one end coupled to the one anchoring member and an opposite end coupled to the other anchoring member.
7. The vertebral support system of claim 6 further comprising a coupling member for receipt of the elongate member extending therethrough, the coupling member secured to one of the base members by an associated anchor member extending through one of the openings in the base member; and
a recessed portion of each of the openings of the base member configured for seating a lower portion of the coupling member therein.
8. The vertebral support system of claim 6 , further comprising
a second pair of anchor members with one of the second pair of anchor members extending through the other one of the openings in the first vertebral cleat and the other of the second pair of anchor members extending through the other one of the openings in the second vertebral cleat; and
a second elongate member extending between the first and second spaced vertebral cleats, the second elongate member having one end coupled to the one anchor member of the second pair of anchoring members and an opposite end coupled to the other anchor member of the second pair of anchoring members.
9. The vertebral support system of claim 8 , further comprising an alignment device positioned between the first and second vertebral cleats, the alignment device coupled to the elongate member and the second elongate member.