Bone fixing screws

Claim 1

A bone-fixing screw having a thread to be screwed into a bone and a fixing means located at an outer end thereof which comprises a rod-receiving portion and a retaining screw for installing rods, said rod-receiving portion being formed at the outer end of a threaded shaft and having an opening angularly placed with respect to an axial direction of said threaded shaft so that a rod can be inserted in a slantwise direction, and said retaining screw having an axis angularly arranged to said axial direction of said threaded shaft and being employed to secure a rod in said rod-receiving portion in a fixed position which maintains its position in use, said screw is so constructed that an enlarged head is disposed at the outer end of said threaded shaft and a rod-receiving portion composed of a cylindrical surface parallel to a rod 20 is grooved, said rod-receiving portion having an angular opening is surrounded by an axially extending long arm carrying said retaining screw and another arm that is shorter and thinner than the long arm to allow torque being applied by said retaining screw to reform said shorter arm and closely grip a rod inserted into said rod receiving portion without movement of said long arm.