This study aims to test a new treatment called ARC-IM Therapy for Parkinson's Disease. Parkinson's Disease is a condition that affects movement, causing problems like walking difficulties. The study uses a method called Epidural Electrical Stimulation (EES), which sends electrical signals to help muscles work better and improve walking. The study will be held at Lausanne University Hospital in Switzerland and lasts four years for each person. The first year has intensive participation, including surgery to place a device, several study sessions, and home rehabilitation. For the next three years, participants will use the device at home with regular check-ins.

• The study lasts 4 years per participant.
• Participants will need to travel to Lausanne, Switzerland.
• After the first year, participants can use the device at home.