Abstract: An apparatus for the mobile fixation of bones in one plane, which has a first assembly plate that can be fixed on the bone by a suitable first fastener and which has a first connecting part and a second assembly plate which can be fixed on the bone by a suitable second fastener, and which has a second connecting part. Optionally, the apparatus has at least one further assembly plate, which can be fixed on the bone by a suitable fastener and it has a further connecting part which is mounted on a connecting element. The connecting element is mounted on the connecting parts so that the movement of the assembly plates is possible in relation to each other in substantially only one plane, and a change of spacing of the assembly plates relative to each other is possible by a predetermined length.

Abstract: This invention relates to a device for the gradual distraction of bones, to be used especially in craniofacial dysostoses with early stenosis of the cranial sutures, comprising an internally threaded first sleeve intermeshing with an externally threaded spindle, which has an activating point. The spindle consists of an anterior extension, which slides into a second, unthreaded sleeve and rotates freely therein. The first sleeve is fitted with the first mounting plate, which rotates and features bore holes for the fixation via mini-screws to bone. The second sleeve embracing the spindle, is furnished with the holding elements for attachment in or to the bone.