Orthopaedic fixation device, system and method
An implantable fixation device for rejoining opposed portions of a separated bone. The device including two corresponding plates that are configured to be aligned and coupled to a bone, such as a sternum, pre-resection of the bone or prior to cutting/separating the bone. The placement of the corresponding plates provides a gap between the edges of the plates that face one another allowing for and guiding a cutting tool for separating the bone. After the bone has been cut and the desired surgical procedure performed, the plates also assist in realigning and fixation of the bone portions. At least one plate includes a ratchet mechanism that is configured to tighten a locking element and draw the two plates together and into alignment with one another.
1. A method for joining opposed parts of a bone or other body portion, comprising:
providing a first joinder member and a second joinder member;
attaching said first and second joinder members to a bone or other body portion along a divide which said joinder members are intended to reduce or close, with a space separating said joinder members, said space adapted to permit a surgical cutting tool to pass through said space and cut the underlying bone or body portion to create said divide;
providing a mechanism which engages said joinder members across said divide to reduce or close said divide;
creating said divide using a surgical cutting tool; and
reducing or closing said divide using said mechanism contemporaneously with said joinder members.
2. The method of claim 1 , wherein openings are defined in each of said joinder members extending through a top and bottom sides of each said joinder member for receiving fixation elements for anchoring each said joinder member to an underlying bone or body portion, and further including a step of fixing said joinder members in place by anchoring said fixation elements to the underlying bone or body portion.
3. The method of claim 1 , wherein said mechanism is a winding mechanism on said first joinder member having a rotary piece and an anchor point being formed on said rotary piece.
4. The method of claim 3 , further including a step of providing a bendable elongated locking element having one end received by said anchor point, and another end attached to said second joinder member, said locking element spanning said divide, and said winding mechanism with said locking element received by said anchor point causing said locking element to wrap about said rotary piece as said rotary piece is rotated, and thereby drawing said joinder members into relative engagement as said winding mechanism is advanced.
5. The method of claim 4 , wherein said winding mechanism is a ratchet mechanism comprising a wheel rotating on an axis with a pawl formed on said wheel that interacts with a ratchet element, and a latch being formed on said wheel as said anchor point.
6. The method of claim 1 , further including a step of providing at least one stabilizing element, and the at least one stabilizing element having a part on one joinder member which inter-fits with another part on the other joinder member, the at least one stabilizing element spanning said divide.
7. The method of claim 6 , wherein the at least one stabilizing element includes at least two stabilizing elements, said stabilizing elements comprising joinder bars mounted for movement on one of said joinder members and receiving receptacles for receiving a portion of each said joinder bar on the other of said joinder members, said joinder bars being spaced apart along said divide.
8. The method of claim 1 , wherein said joinder members are each in the form of plates having generally planar tops and bottoms.
9. The method of claim 1 , wherein the mechanism is a wheel.