A device that implements a method for performing integrated caching in a data communication network. A steel sheets 16 is fixed on the side of the inner circumferential surface 4b opposing the stoppers 28 via the narrow diameter portion 26. radiation modes of different polarisation, at a predetermined resonance wavelength. A rocker arm is attachable to the motor support unit at a central pivot axis thereof, wherein the rocker arm is operably connected to the second ends of the connecting rods and is moved about the central pivot axis by rotation of the output shaft. Therefore the puncture marks caused in the patient will have a smaller diameter than with conventional \u201cintroducer needles\u201d, reducing pain, leakage and the chances of infection. The invention also relates to an additional device, a corresponding method and a computer program.