Abstract: The present invention provides a device (10) suitable for insertion between vertebral portions and having a first, collapsed, position and a second, extended, position, wherein the device comprises upper and lower supports (18, 20) and side supports (22, 24) pivotally connected thereto and in which one of said side supports includes a reaction surface (34) against which, in operation, an actuation member (36) acts so as to cause opening of said device. The device may be used as an implant or prosthesis or as a tool for compacting diseased bone material. The medical methods of using the device are also disclosed.

Abstract: A device for moving a first object relative to a second object, which device comprises a first part, which can be fixed to the first object, and a second part, which can be fixed to the second object. The first part comprises an elongated portion, along which the second part can move, which second part is provided with a clamping member, which is capable of clampingly engaging the elongated portion. The clamping member comprises shape memory metal, which gives the clamping member a clamping shape or a releasing (non-clamping) shape, depending on the temperature of the shape memory metal. The device may be suitable for being implanted into a human or animal body, whereby the first object is a first bone portion and the second object is a second bone portion, which bone portions are to be moved relative to each other.