EPC Performance Investigation for StereoElectroEncephaloGraphy

Outcome data collected from this study will provide the basis for Post-Market Surveillance (PMS) reporting, Clinical Study Report (CSR), Clinical Evaluation Report (CER) on Alcis devices and support peer-reviewed publications on products performance and safety.

Inclusion criteria

• To be included, patients must be:
• 18 months to 65 years
• Patient with drug-resistant and disabling focal epilepsy
• Informed and willing to sign an informed consent form approved by EC / For minors: if one of the parents cannot consent within the timeframe provided by the protocol, then only one parent's signature is required
• Affiliation to the social security or foreign regime recognized in France
• For prospective inclusion: Patient considered for SEEG exploration as part of pre-surgical assessment of epilepsy
• For ambispective inclusion:

• Must have undergone an SEEG exploration with one ALCIS device before the date of the initiation visit
• Follow-up visits (at least 12-month) must be prospective
• Must have complete information available for each completed visit (demographics, preoperative information, implantation information, device details) *.

Exclusion criteria

• • Not able to comply with the study procedures based on the judgment of the assessor (e.g. cannot comprehend study questions, inability to keep scheduled assessment times)

• Any medical condition that could impact the study at investigator's discretion (e.g. allergy…)
• Pregnant women (contraindication to SEEG exploration)
• Adult subject to legal protection measure
• Skull thickness inferior at 2 mm