This study is about using special electrodes called CARTESIA™ to help people with Parkinson's disease, a brain disorder that affects movement. These electrodes are used in a treatment called Deep Brain Stimulation (DBS), which helps control symptoms like shaking and stiffness. DBS works by sending small electrical signals to the brain. The study tests if using directional electrodes (which can focus the electrical signals more precisely) is better than the regular method. **Key Points:** - The study lasts for at least 30 months, which is a bit more than 2 years, so participants need to be willing to commit for the long term. - Participants should have been diagnosed with Parkinson's for more than 4 years and must be able to handle surgery and anesthesia safely. - It's important that participants continue with their regular Parkinson's medicine during the study and are able to follow up regularly. This therapy doesn't stop Parkinson's from getting worse, but it aims to make movement easier and reduce medicine side effects. Participants who join should not have serious health issues that could interfere with the treatment or its follow-up.