Internal fixation device for securing two fractured bone joints together

Abstract

Abstract An internal fixation device for securing two adjacent fractures bone parts together comprises a tubular member which is adapted to be driven into the two fractured bone parts. The tubular member has a plurality of circumferentially arranged and longitudinally extending slots therein at two longitudinally spaced locations which would normally be aligned with the respective bone joints. A shaft member is engaged in the tubular member and has a threaded portion in the vicinity of each set of slots. A nut member is engaged on the threaded portion adjacent each slot and has a fin part which extends through the slot and is engageable with the bone part. To facilitate the outward movement of the fins which are carried on a cylindrical bushing so as to extend axially outwardly from one end a spring is positioned around the rod and a cam member in the form of a cylindrical bushing is disposed between each end of the spring and an associated internally threaded bushing which carries the fins. When the bushings are displaced along the threaded portions the cam member contacts the fins and pushes them radially outwardly through the slot to engage into the associated bone joint structure. The bushings are advanced along the rod member by rotating the rod member which preferably has threads arranged so that the bushings move in directions toward each other to advance the bone joint parts together and to close the joint therebetween.

Inventors

• 👤 Rafael Pares Avila

Bibliographic Details