A system for securing bones together across a joint includes a transfixation screw and a plate. The plate includes an elongate spine having a transfixation screw hole disposed along the spine. The transfixation screw hole includes an inner surface configured to direct the transfixation screw through
A system for securing bones together across a joint includes a transfixation screw and a plate. The plate includes an elongate spine having a transfixation screw hole disposed along the spine. The transfixation screw hole includes an inner surface configured to direct the transfixation screw through the transfixation screw hole such that the transfixation screw extends alongside the bridge portion at a trajectory configured to pass through a first position on the first bone and a second position on the second bone once the plate is placed across the joint. The transfixation screw includes a head configured to abut the inner surface of the transfixation screw hole and a shaft configured to contiguously extend through the first bone, across the joint, and into the second bone.
대표청구항▼
1. A system for securing two discrete bones together across a joint between the two bones, comprising: an elongate spine having: a first end comprising: at least one fixation point for attaching the first end to a first discrete bone on a first side of an intermediate joint; anda first inner surface
1. A system for securing two discrete bones together across a joint between the two bones, comprising: an elongate spine having: a first end comprising: at least one fixation point for attaching the first end to a first discrete bone on a first side of an intermediate joint; anda first inner surface configured to substantially conform with a geometry of the first discrete bone;a second end comprising: at least one fixation point for attaching the second end to a second discrete bone on a second side of the joint; anda second inner surface configured to substantially conform with a geometry of the second discrete bone; anda bridge portion disposed between the first end and the second end, the bridge portion configured to span across the joint, at least a portion of said bridge portion having a depth greater than at least a portion of the depth of either the first end or the second end; anda transfixation screw hole disposed along the spine, the transfixation screw hole comprising an inner surface configured to direct the transfixation screw through the transfixation screw hole such that the transfixation screw extends the bridge portion at a trajectory configured to pass through a first position on the first discrete bone, a portion of the joint, and a second position on the second discrete bone once the plate is placed across the joint; anda transfixation screw comprising a head configured to abut the inner surface of the transfixation screw hole and a shaft configured to contiguously extend through the first discrete bone, through the joint, and into the second discrete bone so as to absorb tensile load when the second discrete bone is loaded relative to the first discrete bone thereby transferring the tensile load from the second discrete bone, through the screw into said head and said bridge portion. 2. The system of claim 1, wherein: a central axis of the inner surface of the transfixation screw hole defines the trajectory; andthe trajectory is configured to cross a neutral bending axis of the joint once the plate is placed across the joint. 3. The system of claim 2, wherein the first position resides on a compression side of the joint and the second position resides on a tension side of the joint. 4. The system of claim 2, wherein the trajectory is configured to pass through the joint at a transfixation angle between about 30 degrees and about 70 degrees measured from the neutral bending axis. 5. The system of claim 2, wherein the trajectory is configured to pass through the joint at a transfixation angle of about 50 degrees measured from the neutral bending axis. 6. The system of claim 1, wherein the inner surface of the transfixation screw hole is configured to lockably engage the head of the transfixation screw. 7. The system of claim 1, wherein the plate further include a compression hole defined by an inner surface in the plate surrounding an oblong opening, the inner surface of the compression hole including, at one end, a horse-shoe-shaped countersink. 8. The system of claim 1, wherein at least one attachment point comprises a threaded screw hole defined by a threaded inner surface configured to lockably engage one of a plurality of locking bone screws. 9. The system of claim 1, wherein the transfixation screw comprises a lag screw having: at a first end of the shaft adjacent to the head, an unthreaded portion configured to extend through the first bone; andat a second end of the shaft adjacent to the tip, a threaded portion configured to extend into the second bone. 10. A plate for securing two discrete bones together across an intermediate joint, comprising: an elongate spine having: a first end comprising: at least one fixation point for attaching the first end to a first discrete bone on a first side of a joint; anda first inner surface configured to substantially conform with a geometry of the first bone;a second end comprising: at least one fixation point for attaching the second end to a second discrete bone on a second side of the joint; anda second inner surface configured to substantially conform with a geometry of the second bone; anda bridge portion disposed between the first end and the second end, the bridge portion configured to span across the joint; anda transfixation screw hole disposed along the spine, the transfixation screw hole comprising an inner surface configured to direct a transfixation screw through the transfixation screw hole such that the transfixation screw extends alongside the bridge portion at a trajectory configured to pass through a first position on the first bone and a second position on the second bone once the plate is placed across the joint, enabling said screw to absorb tensile load when the second bone is loaded permitting transfer of the tensile load through said screw into said bridge, wherein at least a portion of said bridge portion and said transfixation screw hole has a depth greater than at least a portion of said first and second ends. 11. The plate of claim 10, wherein: a central axis of the inner surface of the transfixation screw hole defines the trajectory; andthe trajectory is configured to cross a neutral bending axis of the joint once the plate is placed across the joint. 12. The plate of claim 11, wherein the first position resides on a compression side of the joint and the second position resides on a tension side of the joint. 13. The plate of claim 10, wherein the trajectory is configured to pass through the joint at a transfixation angle of about 50 degrees measured from the neutral bending axis. 14. The plate of claim 10, wherein the plate further includes a compression hole defined by an inner surface in the plate surrounding an oblong opening, the inner surface of the compression hole including, at one end, a horse-shoe-shaped countersink. 15. The plate of claim 10, further comprising a first flared hip on a first side of the plate and a second flared hip on a second side of the plate, the flared hips comprising two generally parabolic wings extending laterally from the spine and being symmetrically opposed to one another about the transfixation screw hole.
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