An arrangement for coupling at least one beam of optical tweezers for trapping particles andor a treatment beam into a microscope beam path, preferably in a laser scanning microscope, wherein means are provided for changing the position of the beam focus of the optical tweezers andor of the treatment beam in a freely adjustable manner for purposes of changing the focal position of the microscope. The stent is crimped to the balloon by a process that includes heating the stent to a temperature below the polymer’s glass transition temperature to improve stent retention without adversely affecting the mechanical characteristics of the stent when later deployed to support a body lumen. The rotator pivotally connects with the main body in a vertical axial direction. The electrowetting element is arranged for enabling powering of said first and second electrode layers for rearranging said polar liquid relative to said non-polar liquid. The waveform controller utilizes waveform parameters, e.