The invention concerns an instrument suited for cryogenic treatments, for the medical or paramedical field as well as for the cosmetic field, comprising a micro-applicator (2) having a bore of the order to 20 to 120 mu m supplied with a gas stream wherein all the foreign particles above 0.3 mu m and preferably above 0.1 mu m are eliminated. The invention also concerns a micro-applicator (2) designed to be used in such an instrument provided with a filter housed in or on said micro-applicator (2), so that each time the latter is replaced, the filter (14) is also replaced.
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