Intramedullary fixation device for metaphyseal long bone fractures
View Patent ↗A fracture fixation system includes a device with a plate portion intended to be positioned against an exterior surface of bone and an intramedullary portion. The plate portion includes a plurality of fixed angle holes defining a respective number of axes which are divergent. Fasteners coupled within the fixed angle holes extend to follow the contour of subchondral bone and provide a framework for support for fracture healing.
1. A bone fracture fixation device for a long bone having a metaphysis with an exterior surface and a diaphysis with a medullary canal, comprising:
a) an elongate intramedullary nail portion having a circular cross section and including a relatively flexible section and a relatively rigid section relatively larger in diameter than said relatively flexible section, said rigid section including at least one screw hole;
b) a plate portion having a bone contacting lower surface and including a plurality of fastener holes each structured to constrain an associated fastener at a fixed angle relative to said plate portion, said fixed angles being oblique relative to each other so as to direct associated fasteners in a relatively divergent orientation, wherein said plate portion is not coaxial with said nail portion; and
c) a neck portion joining said relatively rigid section of said nail portion and said plate portion, said neck portion longitudinally and laterally offsetting said plate portion relative to said nail portion,
wherein when the nail portion is implanted in the medullary canal of the diaphysis of the long bone, the neck portion offsets the lower surface of said plate so that the lower surface of the plate contacts the exterior surface of the metaphysis of the long bone.
2. A bone fracture fixation device according to claim 1 , wherein:
said plate portion is substantially parallel to said nail portion.
3. A bone fracture fixation device according to claim 1 , wherein:
said relatively rigid section of said nail portion is substantially straight.
4. A bone fracture fixation device according to claim 1 , wherein:
said relatively flexible section is sized to be inserted into a medullary canal of a radius bone.
5. A bone fracture fixation device according to claim 1 , wherein:
said relatively rigid section tapers in diameter into said flexible portion.
6. A bone fracture fixation device according to claim 1 , wherein:
said lower surface of said plate portion is substantially concave.
7. A bone fracture fixation device according to claim 1 , wherein:
said plate portion includes a substantially convex upper surface.