Equipment for displacing two portions of a bone, comprises outer sleeve which contains electric motor and reduction gear to drive threaded rod which engages with threaded shoulder inside inner tube

摘要

An outer sleeve (1) has electronic processing and control equipment (18), an electric motor (11) and reduction gear (14) located in an upper compartment (4). The reduction gear output shaft (15), typically hexagonal, is connected to an operating rod (3) which is threaded (52) and engages with a threaded shoulder (50,51) inside an inner tube (40). The inner tube is prevented from rotating by a groove and pin (43,45) and thus moves axially