Ancillary tool for positioning a glenoid implant
The ancillary tool according to the invention comprises a plate which defines a convex surface intended to bear against the glenoid cavity of a patient's scapula and which forms a directional guide for a drilling, fashioning or like member. To allow the surgeon to apply this member in a chosen direction, the tool comprises means for adjusting the position of the guide with respect to the plate.
1. An ancillary tool for positioning a glenoid implant on a prepared surface of a glenoid cavity, the ancillary tool comprising:
a base plate comprising a primary opening and a bearing surface adapted to engage with the prepared surface of the glenoid cavity;
a drilling guide engaged with the primary opening and movable through at least two degrees of freedom relative to the base plate, such that at least a portion of the prepared surface is accessible through the primary opening and a guide hole in the drilling guide when the base plate is engaged with the glenoid cavity; and
a securing mechanism adapted to releasable secure the drilling guide relative to the base plate.
2. The ancillary tool of claim 1 wherein the guide is moveable through at least two degrees of freedom comprise rotation around an X-axis and an Y-axis.
3. The ancillary tool of claim 1 wherein the guide pivotally engages with the base plate.
4. The ancillary tool of claim 1 comprising angular references indicating a position of the guide relative to the base plate.
5. The ancillary tool of claim 1 comprising angular references wherein graduation zero corresponds to the guide hole substantially perpendicular to the bearing surface.
6. The ancillary tool of claim 1 comprising an angular positioning device operably coupled to the guide.
7. The ancillary tool of claim 1 comprising a horizontal guide component and a vertical guide component operably coupled to the guide.
8. The ancillary tool of claim 1 comprising: an angular positioning device operably coupled to the base plate; and
a rod operatively coupling the angular positioning device to the guide.
9. The ancillary tool of claim 1 comprising a rod operatively coupled to the guide hole.
10. The ancillary tool of claim 1 wherein the bearing surface on the base plate is convex.
11. The ancillary tool of claim 1 wherein the bearing surface comprises at least one feature that releasably secures the base plate to the prepared surface of the glenoid cavity.
12. The ancillary tool of claim 1 wherein the bearing surface comprises a plurality of barbs that releasably secure the base plate to the prepared surface of the glenoid cavity.
13. The ancillary tool of claim 1 comprising a fastener adapted to retain the guide in the primary opening.
14. The ancillary tool of claim 1 wherein at least a portion of the guide and at least a portion of the primary opening comprise complementary cross-sections.
15. The ancillary tool of claim 1 wherein the guide comprises a sphere.
16. The ancillary tool of claim 1 wherein the guide hole comprise one of a drilling guide or a marking guide.
17. The ancillary tool of claim 1 comprising one or more of a drill bit, an impact pin, or a marking pin located in the guide hole.
18. The ancillary tool of claim 1 comprising a base adapted to receive and secure the base plate.
19. The ancillary tool of claim 18 comprising a horizontal guide component and a vertical guide component operably coupled to the base.
20. An ancillary tool for positioning a glenoid implant on a prepared surface of a glenoid cavity, the ancillary tool comprising:
a positioning rod slidably engaged with a horizontal guide component and a vertical guide component;
a joint component coupleable with the positioning rod; and
a base plate comprising a bearing surface adapted to be releasably secured to the prepared surface of the glenoid cavity, wherein the base plate defines an opening configured to receive at least a portion of the joint component such that the joint component is able to articulate in the opening of the base plate in at least two degrees of freedom.