Spinal rod connector and methods

1. A spine rod connector, comprising:

a base portion, including:

opposing top and bottom surfaces;

opposing front and rear surfaces;

opposing first and second side surfaces;

at least a first side rod aperture extending between the first and second side surfaces, the first side rod aperture having a first minimum cross-sectional dimension;

at least a second side rod aperture extending between the first and second side surfaces, the second side rod aperture having a second minimum cross-sectional dimension different than the first minimum cross-sectional dimension;

at least one front rod aperture defined in the front surface and having a third minimum cross-sectional dimension substantially equal to both the first minimum cross-sectional dimension and a first maximum diameter of a first rod, the at least one front rod aperture intersecting the first side rod aperture;

at least one rear rod aperture defined in the rear surface and having a fourth minimum cross-sectional dimension substantially equal to both the second minimum cross-sectional dimension and a second maximum diameter of a second rod, the at least one rear rod aperture intersecting the second side rod aperture; wherein the first and second side rod apertures and the front and rear rod apertures are cylindrical shaped having a circular cross-section;

at least first and second set screw apertures defined in the top surface, the first set screw aperture intersecting the front rod aperture and the first side rod aperture only, and the second set screw aperture intersecting the rear rod aperture and the second side rod aperture only;

a plurality of set screws, a separate set screw operable in each of the first and second set screw apertures.

2. The spine rod connector of claim 1 , wherein the front and rear rod apertures are coaxial.

3. The spine rod connector of claim 1 , wherein the first and second set screw apertures are arranged perpendicular to the first and second side rod apertures and the front and rear rod apertures.

4. The spine rod connector of claim 1 , wherein the front and rear rod apertures include axes that are arranged coplanar and non-coaxial.

5. The spine rod connector of claim 1 , wherein the first and second side rod apertures are arranged coplanar with the front and rear rod apertures.

6. The spine rod connector of claim 1 , wherein the top surface includes an offset height feature located between the first and second set screw apertures.

7. The spine rod connector of claim 6 , wherein the offset height feature is a step feature.

8. The spine rod connector of claim 1 , further comprising a second front rod aperture that intersects with the first side rod aperture, a second rear rod aperture that intersects with the second side rod aperture, a third set screw aperture intersecting the second front rod aperture and the first side rod aperture, and a fourth set screw aperture intersecting the second rear rod aperture and the second side rod aperture.

9. The spine rod connector of claim 1 , wherein the first and second side rod apertures have axes that are parallel.

10. A spine rod assembly, comprising:

a spine rod connector, comprising:

a base portion including a first pair of intersecting bores wherein a first bore of the first pair of intersecting bores has a first minimum cross-sectional dimension and a second bore of the first pair of intersecting bores has a second minimum cross-sectional dimension equal to the first minimum cross-sectional dimension, and a second pair of intersecting bores wherein a first bore of the second pair of intersecting bores has a third minimum cross-sectional dimension and a second bore of the second pair of intersecting bores has a fourth minimum cross-sectional dimension equal to the third minimum cross-sectional dimension, the third and fourth minimum cross-sectional dimension different than the first and second minimum cross-sectional wherein the first and second bores of the first and second pairs of intersecting bores are cylindrical shaped having a circular cross-section dimension, the base portion further including a first set screw aperture that intersects the first pair of intersecting bores and a second set screw aperture that intersects the second pair of intersecting bores; and

a plurality of set screws, a separate set screw operable at the intersection of each pair of bores;

a first rod member inserted in one of the bores of the first pair of intersecting bores and arranged for contact by one of the set screws to secure the first rod member to the spine rod connector; and

a second rod member inserted in one of the bores of the second pair of intersecting bores and arranged for contact by one of the set screws to secure the second rod member to the spine rod connector.

11. The spine rod assembly of claim 10 , wherein the first bore of the first pair of bores is arranged in parallel with the first bore of the second pair of bores.

12. The spine rod assembly of claim 11 , wherein the second bore of the first pair of bores is arranged in parallel with the second bore of the second pair of bores.

13. The spine rod assembly of claim 10 , wherein the first bore of the first pair of bores is arranged at a converging angle or a diverging angle relative to a first bore of the second pair of bores.

14. The spine rod assembly of claim 10 , wherein the first bore of the first pair of bores is arranged coaxial with the first bore of the second pair of bores.

15. The spine rod assembly of claim 10 , wherein the first and second pairs of bores are arranged coplanar.

16. The spine rod assembly of claim 10 , wherein the base portion further includes first and second additional bores, and a separate set screw operable at an intersection of the first additional bore with one bore of the first pair of bores and a separate set screw operable at an intersection of the second additional bore with one bore of the second pair of bores.

17. The spine rod assembly of claim 16 , wherein the first and second additional bores are arranged coaxial with each other.

18. The spine rod assembly of claim 17 , wherein the first and second additional bores have different diameters.

19. A method of connecting first and second spine rods using a spine rod connector, the method including:

providing a spine rod connector comprising a first pair of intersecting bores and a second pair of intersecting bores, where each pair of intersecting bores are generally perpendicular, and wherein a first bore of the first pair of intersecting bores has a first bore diameter and a second bore of the first pair of intersecting bores has a second bore diameter equal to the first bore diameter and a first bore of the second pair of intersecting bores has a third bore diameter and a second bore of the second pair of intersecting bores has a fourth bore diameter equal to the third bore diameter; wherein the first and second bore diameters are different than the third and fourth bore diameters, wherein the first and second bores of the first and second pairs of intersecting bores are cylindrical shaped having a circular cross-section, the spine rod connector further comprising a first set screw aperture intersecting the first pair of intersecting bores and a second set screw aperture intersecting the second pair of intersecting bores

selecting which bore of the first pair of intersecting bores to receive the first spine rod and which bore of the second pair of intersecting bores to receive the second spine rod;

inserting the first spine rod in the selected bore of the first pair of intersecting bores, the first spine rod having a size corresponding to the first maximum bore diameter;

securing the first spine rod to the spine rod connector;

inserting the second spine rod in the selected bore of the second pair of intersecting bores, the second spine rod having a size corresponding to the third bore diameter;

securing the second spine rod to the spine rod connector.

20. The method of claim 19 , wherein inserting the second spine rod includes arranging the second spine rod generally parallel with the first spine rod.

21. The method of claim 19 , wherein inserting the second spine rod includes arranging the second spine rod generally perpendicular with the first spine rod.

22. The method of claim 19 , wherein at least one bore of the first pair of bores is arranged coaxial with at least one bore of the second pair of bores, and wherein inserting the second spine rod includes arranging the second spine rod generally coaxial with the first spine rod.