Going deep A DBS system consists of a probe about 1.5mm wide with four small electrodes at the bottom, a battery-operated pacemaker, and a thin connecting wire.
The probe is inserted about 6cm deep in the brain at a very specific target area, where it emits a low-voltage, high-frequency electric pulse drawn from the pacemaker via a connecting wire that runs under the skin. The pacemaker itself is also implanted under the skin, in the pectoral (chest) area.
Why exactly an electric pulse at a target area in the brain helps alleviate the symptoms of Parkinson's disease is anyone's guess.
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