A method for checking a faultless joint between a first and a second component of a medical device, namely a drip chamber and a spike, wherein the first component has an annular coupling edge facing downwardly to be sprayed interiorly with a liquid solvent. The solvent is mixed with a tracer detectable through ultraviolet or infrared light and the coupling edge is illuminated with a ultraviolet or infrared light so as to make an image of the sprayed solvent, which is reflected and captured by an electronic scanning device configured to establish whether such image is faultless, visible through a tracer.
