Combined intramedullary-extramedullary bone stabilization and alignment system
View Patent ↗Disclosed is a combined intramedullary and extramedullary bone stabilization and alignment system, which includes both methods and apparatuses for the alignment and stabilization of a first bone or piece of bone to a second bone or piece of bone. Embodiments of the system may include an implant device which has an elongated framework within intramedullary portion and an extramedullary portion which are cannulated. The cannulated aspect of the framework includes a wire aperture through both the intramedullary portion and the extramedullary portion.
1. An implant device configured for implanting in a patient with a first metatarsal bone which has been surgically cut into two pieces, to align or stabilize a first piece of the first metatarsal bone relative to a re-aligned second piece of the first metatarsal bone of a patient, the implant comprising:
an elongated framework including an intramedullary portion integral with an extramedullary portion, configured to attach the first piece of the first metatarsal bone to the second piece of the first metatarsal bone;
the intramedullary portion configured for insertion into the first piece of the first metatarsal bone and including at least one fastener aperture configured to transversely receive a bone fastener there-through, each of said at least one fastener aperture extending along an axis perpendicular to a longitudinal axis of the intramedullary portion;
the extramedullary portion configured to abut a prepared external surface of the second piece of the first metatarsal bone and including at least one fastener aperture disposed to transversely receive a bone fastener inserted in the second piece of the first metatarsal bone, each of said at least one fastener aperture extending along an axis perpendicular to a longitudinal axis of the extramedullary portion; and
a wire aperture through the intramedullary portion of the framework, disposed to receive and be guided by a guide wire inserted in the first piece of the first metatarsal bone as the intramedullary portion is inserted into the first piece of the first metatarsal bone over the guidewire, thereby accurately aligning the extramedullary portion with the prepared external surface of the second piece of the first metatarsal bone with the guide wire;
wherein the wire aperture extends continuously through the intramedullary portion and the extramedullary portion, the extramedullary portion being bent at an angle relative to the intramedullary portion such that the wire aperture extends entirely through the intramedullary portion at an angle perpendicular to the at least one fastener aperture axis of the intramedullary portion and the wire aperture extends partially through the extramedullary portion at a non-perpendicular angle to the at least one fastener aperture axis of the extramedullary portion.
2. An implant device as recited in claim 1 , and further wherein the wire aperture is a slit in the framework.
3. An implant device as recited in claim 1 , and further wherein the wire aperture is a fully enclosed guide or cannula in the framework.
4. An implant device as recited in claim 1 , and further wherein the intramedullary portion is generally circular or oval and the extramedullary portion is a plate.
5. An implant device as recited in claim 1 , and wherein the at least one fastener aperture on the extramedullary portion of the framework is comprised of a first fastener aperture and a second fastener aperture spaced apart from the first fastener aperture.
6. An implant device as recited in claim 5 , and further wherein the first and second fastener apertures are configured to combine with a first bone fastener inserted through the first fastener aperture and a second bone fastener inserted through the second fastener aperture, to secure the extramedullary portion of the framework to the first bone of the patient.
7. An implant device as recited in claim 1 , and further wherein the prepared external surface of the second piece of the first metatarsal bone of the patient is a surgically cut flat surface.
8. An implant device as recited in claim 1 , and further wherein the guide wire is a k-wire.