The invention describes a device (1) for the amelioration of a recess (8),particularly a recess in a porous materialor (human) bone (7). The device comprises an element (2) for producing orcoupling mechanical energy, such as ultrasonicoscil-lations, and a cylindrical collar (4) comprising a cylindrical lateralsurface having an outside diameter and having a central recess(26) for accommodating a guide pin (3), wherein the guide pin (3) is providedto be inserted substantially down to the base of therecess (8) before applying oscillations, wherein the guide pin (3) in theregion of the end thereof facing the base of the recess issurrounded by an amelioration sleeve (6) made from a material that can beliquefied by way of ultrasonic oscillations, wherein thecylindrical lateral surface of the amelioration sleeve (6) substantially hasthe same outside diameter as the collar (4), and whereinthe guide pin (3) is accommodated in the central recess (26) in a displaceablemanner such that the collar (4) upon applyingultra-sonic oscillations can be displaced relative to the guide pin (3) in thedirection toward the base of the recess (8) while liquefyingand laterally and/or longitudinally displacing the material of theamelioration sleeve (6). The invention further describes elementsof such a device, and sterile packages having such elements, and methods forthe amelioration of recesses in bones, such as jawbones or spine elements.
