Method of treating an overactive bladder condition

A method of treating an overactive bladder condition, the method comprising:

• providing a stimulation device comprising a generator enclosing a primary cell that is coupled to circuitry, and a lead coupling an electrode assembly to the generator, where the circuitry is operable to generate a stimulation signal with a duty cycle of between 0.1% and 2.5% and a total average current drain from the primary cell of between 0.1 μA and 5 μA, with the total average current drain comprising a background current plus a stimulation current weighted by the duty cycle;
• forming an incision in skin of a patient diagnosed with the overactive bladder condition;
• forming a tunnel under the skin from the incision into a leg of the patient;
• placing the generator in the tunnel;
• placing a portion of the lead and the electrode assembly in the tunnel and locating the electrode assembly at or adjacent to a posterior tibial nerve in the leg of the patient;
• closing the incision;
• and
• operating the circuitry to generate the stimulation signal and causing the electrode assembly to stimulate the posterior tibial nerve for about 30 minutes each week in treating the overactive bladder condition.