Directional Bilateral Thalamic Patterned Stimulation (Chronos)
Trial Parameters
Brief Summary
Population Size and Eligible Patients: The investigators aim to recruit 5 to 10 patients with tremors who have previously undergone Ventral Intermedius Deep Brain Stimulation (VIM-DBS) treatment but have experienced early or late loss of benefits. Additionally, the investigators will enroll ten patients with essential tremor who require VIM-DBS surgery. These individuals will undergo bilateral implantation of Boston Scientific Genus Implantable Pulse Generator (IPG) devices, connected to Boston Scientific Cartesia™ 8-contact Directional Leads. Study Design: This study comprises two distinct phases. Phase 1 is a cross-sectional investigation designed to identify the optimal algorithm for patterned stimulation in the VIM region . Phase 2 is a prospective clinical trial focusing on the assessment of safety and efficacy of bilateral VIM-DBS in patients with essential tremor. Objectives: The primary objective in Phase 2 is to evaluate the safety and effectiveness of bilateral VIM-DBS in individuals with essential tremor. In Phase 1, the investigators seek to explore the impact of the Chronos programming software on tremor patients who have experienced early or late loss of benefits.
Eligibility Criteria
Inclusion Criteria: 1. Phase 1: 5 to 10 tremor patients already treated with VIM-DBS but not doing well due to early and/or late loss of benefits (i.e. tremor scores ON stimulation identical or greater than before surgery in absence of stimulation). 2. Phase 2: 10 Essential Tremor patients in need of DBS surgery. 3. Written and signed Informed Consent. 4. Age 18 to 85 years old. 5. Subject must have Essential Tremor, as defined by all the following criteria: (a) isolated tremor syndrome consisting of bilateral action tremor; (b) at least three years duration; and (c) with or without tremor in other locations (e.g., head, voice, or low limbs) \[1\]. 6. Soft signs (categorizing patients as Essential Tremor-plus) will be allowed and noted in the patient's chart. 7. Subject must be on stable dose of anti-tremor medication for at least 4 weeks prior to screening. 8. Subject had no botulinum injection for at least three months prior to screening. 9. Subject does not have a significant other