Spinal implant with attachment system
View Patent ↗The embodiments of the present disclosure relate to a spinal implant assembly having features to prevent or minimize fixation elements, such as screws, from being dislodged, or from backing out over time and with use. The spinal implant assembly may comprise an implantable body having first apertures for receiving fixation elements. A plate configured to nest against the posterior portion of the implantable body and comprising one or more second apertures can be provided. These second apertures permit access to the head portions of the fixation elements. One or more locking elements are then passed through the second apertures and engage the head portions of the fixation elements. In addition, the plate may comprise an adjustable arm to allow the plate to be used with implantable bodies of different size.
1. An implantable spine stabilization device, comprising:
an implantable body configured for insertion between vertebral bodies of a spine, the body having an upper surface, a lower surface, an anterior portion, and a posterior portion, the posterior portion having one or more apertures for receiving a fixation element, wherein the one or more apertures extends angularly through the body between the upper and lower surfaces;
the fixation element having an elongate shaft and a head portion with an aperture to receive a locking element;
a plate configured to mate with the posterior portion of the body, the plate having one or more apertures to receive the locking element, an adjustable arm, a slot, and a knob configured for insertion into the slot; and
the locking element for securing the fixation element to the plate.
2. The device of claim 1 , wherein the locking element is configured to engage the head portion of the fixation element.
3. The device of claim 1 , wherein the implantable body comprises one or more portals for receiving an imaging marker.
4. The device of claim 1 , wherein the one or more apertures at the posterior portion of the implantable body is configured to permit a predetermined amount of nutation by the fixation element.
5. The device of claim 4 , wherein the one or more apertures is configured to permit about 5 degrees of nutation by the fixation element.
6. The device of claim 1 , wherein the one or more apertures in the implantable body comprises an aperture configured to rigidly seat the fixation element.
7. The device of claim 1 , wherein the head portion of the fixation element is configured to permit a predetermined amount of nutation by the locking element.
8. The device of claim 1 , wherein the head portion of the fixation element is configured to rigidly receive the locking element.
9. The device of claim 1 , wherein the one or more apertures of the plate is configured to permit a predetermined amount of nutation by the locking element.
10. The device of claim 1 , wherein the plate is configured to rigidly nest on the head portion of the fixation element.
11. The device of claim 1 , wherein the adjustable arm comprises a locking feature to fix a position of the adjustable arm.
12. The device of claim 1 , wherein the locking element comprises a cap, pin or plug.
13. The device of claim 1 , wherein the locking element is configured to sit proud atop the plate.
14. The device of claim 1 , wherein the locking element is configured to seat flush against the plate.