Boston Scientific Directional Lead(Cartesia)  with 8 contacts are produced with a Span length of 7.5 mm. These contacts are located in 4 rows and at different angles. The use of this design helps to transmit electric current in the direction desired by the doctor at different angles and points to prevent unwanted stimulation of other parts. 
Production and Design of Directional Leads using MICC (Multiple Independent Current Control) technology, Boston Scientific has made the United States the first and only manufacturer of Directional Deep Brain Stimulation System in the world.