A case for modular neck components for hip implants. The device includes an outer and an inner tube-like part; in use, the tube-like parts are joined with essentially parallel axes, The outer tube-like part has a lengthwise slit along part of its length to let part of the blood vessel enter and, with the inner tube-like part, to form the new channel. The orifice also defines a nozzle for ejecting ink droplets. The source may be applied so that the dose and the target area are exposed to the emitted charges during the entire or part of the dose forming process.