Abstract: Embodiments of a corpectomy method, comprising the steps of: providing a distractor unit comprising at least a first hydraulic cylinder configured to removably receive a piston of a predetermined length during a surgical procedure; providing the piston; providing a plurality of bone screws; affixing a first bone screw of the plurality of bone screws to a first vertebrae of a spine and a second bone screw of the plurality of bone screws to a second vertebrae of the spine; mounting the distractor unit onto the first bone screw and the second bone screw; and extending the hydraulic piston of the distractor unit to cause the first vertebrae and the second vertebrae to move away from each other are disclosed.

Abstract: A system and a method for making an injectable mixture using at least one first pulverulent component and a second liquid component with a first piston/cylinder arrangement with a cylinder with an axial extension and a piston, wherein the cylinder includes a measured amount of the pulverulent component, a separate reservoir including a corresponding measured amount of the liquid component, and a transfer device for sealed transfer of said amount of the liquid component to the cylinder for subsequent mixing and injection of the completed mixture. The first piston/cylinder arrangement is an injection syringe. A mixing element being manoeuvrable by a user is positioned inside the cylinder. At least one gas transferring channel means leading to the cylinder is arranged at the cylinder. Engagement means are arranged for connecting the first injection syringe to the separate reservoir during transfer of the liquid component.

Abstract: A positioning device for placing a prosthesis device in a spinal column of a living mammal, the device including at least one holding means for cooperation with the prosthesis device and for guiding thereof during positioning. The positioning device may also include fixing means for fixation with respect to at least one vertebra, where the fixing means includes locking means, which in a first, free state, allows adjustable movement of the holding device and thereby of the prosthesis device, and in a second, locked state, fixes the holding means and thereby the prosthesis device in a selected position. Embodiments of the disclosure also include Embodiments of the invention also include a system.