Multi-axial cross connector
View Patent ↗A cross connector for attachment between two spinal implants comprises a first element having one end and an opposite end configured for engaging one of the two spinal implants, a second element having one end and an opposite end configured for engaging the other of the two spinal implants, an engagement mechanism between the one end of each of the first and second elements, and a locking element for locking the two elements together at the respective one end. The engagement mechanism includes an interface configured to permit relative pivoting between the first element and the second element about at least two non-parallel axes.
1. A cross connector for attachment between two spinal implants comprising:
a first element having one end and an opposite end configured for engaging one of the two spinal implants;
a second element having one end and an opposite end configured for engaging the other of the two spinal implants;
an engagement mechanism between said one end of each of said first and second elements, said engagement mechanism having a spherical interface configured to permit relative pivoting between said first element and said second element simultaneously about three perpendicular axes, wherein said spherical interface includes an annular spherical surface at said one end of said first element, said annular spherical surface defining an opening therethrough, said one end of said first element including an annular spherical upper surface opposite said annular spherical surface, said engagement mechanism further including an annular collar having a lower spherical surface configured for pivoting movement on said spherical upper surface and an upper surface configured to support said one end of said second element thereon;
an interface element having a base with a spherical surface configured for sliding pivoting contact with said annular spherical surface, and a locking portion extending from said base and sized to pass through said opening in said annular spherical surface; and
a locking element for locking said first and second elements together at said respective one end, said locking element being configured for locking said second element to said locking portion when said locking portion extends through said opening;
wherein said one end of said second element includes a slotted plate defining an elongated slot, said locking portion of said interface element includes a locking post projecting from said base and sized to pass through said opening and said elongated slot; and said locking element is configured to engage said locking post when said locking post extends through said opening and said slot.
2. The cross connector of claim 1 , wherein said first element includes an elongated bar between said one end and said opposite end, said bar defining a notch adjacent said annular upper spherical surface and sized to receive a portion of said annular collar therein when said collar is pivoted relative to said annular upper surface.
3. The cross connector of claim 1 , in which at least one spinal implant is an elongated rod, wherein said opposite end of at least one of said first and second elements defines an opening sized to receive the rod therethrough and includes a set screw for clamping the rod within said opening.
4. The cross connector of claim , wherein said first element includes an elongated bar between said one end and said opposite end.