Device for fixing angular stability and compression fracture or osteotomy in a bone

摘要

Device for fixing angular stability and compression fracture or osteotomy in a bone, with a bone plate (1), which is formed by an upper side (4), a lower side (5) and several holes (2) arranged in the longitudinal axis (lA) of the plate, joining the upper side and lower side and bone screws (13) with threaded head (18), which are housed in the holes (2) and can be screwed into the bone, in which at least one hole (2) is a combination of two round holes (2.1; 2.2) with diameters (D1, D2) of different size and the centers of symmetry (SK, SE) of the two holes (2.1; 2.2) are arranged on the longitudinal axis (lA) of the bone plate (1), round holes (2.1 being disposed; 2.2) offset from one another in the direction of the longitudinal axis (lA) such that a circular segment of the hole small (2.2) in the perimeter of the larger hole (2.1) an extension (14) delimited by bo rdes (16), which on one hand has a sickle, characterized in that the inner wall of the large hole (2.1) is provided with an inner thread (15) extending from the upper side (4) to the underside (3) extending to the edges (16) and the extension being formed as a sickle (14) without threading and the center of symmetry (SE) of the small hole (2.2) close to the center of symmetry (SK) of the hole being arranged large (2.1), provided the distance (a) between both centers of symmetry (SK; SE) of both holes (2.1; 2.2) D2 condition 1/18 A 1/3 D2, setting the bone screws (13) the bone in the center of symmetry (SE) of the small hole (2.2) by screwing and while advancing the screw head (18) a conical external thread (21) to be screwed into the threaded inner meshing the large hole (2.1) and generates a relative displacement of the plate relative to the bone.