This trial is testing a small device called eCoin® that is placed under the skin near the ankle. It sends electrical signals to a nerve that helps control the bladder. The study focuses on people who have trouble controlling their bladder and experience sudden urges to urinate. The goal is to see if this device can safely and effectively reduce these symptoms over time. The eCoin is a nickel-sized, battery-powered device implanted in the lower leg to treat overactive bladder, and has been evaluated in previous studies for its safety and effectiveness.