Bone compression screw of two-part shaft uses notchers on shaft to couple to second part as respectively main bored shaft part and second bored part releasably coupled for screw-torquing.

摘要

The shaft (12) has one or more notching elements (32,34) to couple the second shaft sector (14) to the threaded component (18), here designed as a sleeve with bore (40) closed at one sleeve end. The first thread (20) is integral to the shaft (12) which itself is also bored through (36). The integral notching elements (32,34) reach in part into the sleeve bore (40) and the shaft sector (16) mounts the notching elements on shaft extensions (26,28). Thread (20) is of smaller diameter than thread (38). The screwdriver blade comes in two driving parts, coupling or uncoupling to torque the screw.