The invention relates to a multifunctional element (13) which is suitable for performing at least two surgical / therapeutic operations, for example subcutaneous injection and cutting of tissue, comprising an anti-carbonization device (15) for hindering the carbonization of tissue during plasma-coagulation by means of a suitable surgical instrument (17). Said surgical instrument (17) comprises an inlet for an oxidation agent (21), an inlet for a gas (19) and an electrode (23) for producing a plasma, and said anti-carbonization device (15) enables preparation of a gas-oxidation agent mixture for producing a gas-oxidation agent plasma.
