Stimulation apparatus

Apparatus for producing a desired effect by activating tissue at a first predetermined within a body location and to reduce undesired side effect corresponding blocking activation of tissue or conduction of action potentials at a second predetermined within the body site, the apparatus including : first generating means (114) for producing low frequency stimulation; second generator means for producing high frequency stimulation and / or direct current pulses; a first electrode (118) operatively coupled to the first generating means, the first electrode (118) being adapted to activate tissue at the first predetermined low frequency stimulation applied; and a second electrode (140) coupled to the second generator means, characterized in that the second electrode (140) is adapted to block activation of electrically excitable tissue at the second applying high frequency stimulation or UNOO several current pulses, or both high frequency stimulation and one or more direct current pulses, at or near the second so that the high frequency stimulation and / or the direct current pulses prevent the low frequency stimulation applied at the first turn electrically excitable tissue, or produce conduction of action potentials in the second.