US Patent 8372085 Screwdriver for bone screws

A screwdriver for bone screws, especially for compression screws and locking screws, has a handle and shaft extending out centrally from the handle. The shaft has a screwdriving tool on its free end. The shaft, includes a flexible shaft portion, wherein the shaft has two rigid, solid portions on both sides of the flexible portion. The flexible shaft portion has a flexible element for the transmission of a torque, and at least the flexible shaft portion is surrounded by an elastic protection hose or a rubber or plastic elastomeric tubular cover.