Cuff electrode having tubular body with controlled closing force

Nerve cuff electrode including a tubular body having a longitudinal slit and a flap curled over the slit. The tubular body includes a central cathode disposed between two anodes. The region opposite the slit includes a flexible region that determines the flexibility and strength of tube opening and closing. The cuff electrode having a hinge region with a non-linear effective spring constant which can be higher at low cuff openings and lower at large opening to provide an effective yet non-damaging closing force over a wide range of cuff openings. In use, the tube body can be pulled apart using attached suture loops, with one loop and flap pulled under the nerve followed by part of the tubular body. The tubular body can be closed over the nerve and the flap closed over the tube slit.