Osteotomy plate, plate driver and method for their use
View Patent ↗An orthopedic plate is specifically configured for use in osteotomies, in which part of the plate extends into a portion of a first bone segment and part is external to the cortical surface of an adjacent bone segment to fix the segments to allow them to fuse. The plate has a first end and a second end where the end which is inserted into the bone has a chamfer and a through hole having a hole axis optionally at an oblique angle to the longitudinal axis of the plate, and which can receive a screw, peg or pin. The second end of the plate includes a locking screw hole and optionally including a compression slot extending in a direction toward a screw hole in the opposing end. Optionally, the non-locking hole has a shroud that forms an arc or portion of a cylinder over the hole. A plate driver having a recess that holds the plate is used to insert the plate into the bone.
1. A plate system for use in associated bone comprising:
a locking screw having distal threads and a head having external threads,
a non-locking screw having distal threads and a head having a rounded surface without external threads, and
a plate having a first tab and an opposing second tab aligned along a longitudinal axis of the plate and joined by a middle section,
the first tab terminating in a cutting edge and also including a first hole for the non-locking screw, the first hole having a hole axis less than 90 degrees from the longitudinal axis and configured to receive the head of the non-locking screw in a top surface of the plate,
the second tab including a second hole for the locking screw; and
a shroud over the first hole, the shroud contacting the top surface of the first tab between the first hole and the cutting edge, the shroud extending outward from the top surface at an oblique angle and adapted to be interposed between a tissue and the head of the non-locking screw.
2. The plate system of claim 1 , wherein the plate has an undulating width.
3. The plate system of claim 1 , wherein the first tab has an end portion and a shroud portion with a connecting portion therebetween, a width perpendicular to the longitudinal axis adjacent the first hole being greater than a width of the connecting section.
4. The plate system of claim 3 , wherein the second tab has a width perpendicular to the longitudinal axis adjacent the second hole greater than a width of the middle section.
5. A plate system as set forth in claim 1 , wherein the second screw hole is without internal threads.
6. A plate system as set forth in claim 1 , wherein the second screw hole forms an angle with respect to the longitudinal axis of the plate.
7. A plate system as set forth in claim 1 , wherein the screw axis of the non-locking screw within the second screw hole can be varied with respect to the screw hole axis by up to 20° of conical rotation.
8. The plate system of claim 1 , wherein the width of the first tab is larger adjacent the first hole and adjacent the second hole than at a location between the first hole and the second hole.
9. The plate system of claim 1 , wherein the first hole is shaped to permit the non-locking screw to be inserted therethrough with an angle between a screw axis of the non-locking screw and the screw hole axis of up to 20° of conical rotation.
10. The plate system of claim 1 , wherein the cutting edge wraps around the first tab and terminates at a location between the shroud and an end of the first tab.