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NCT Number: NCT06205160

Evaluation of New Flexible High-density Intra-operative ECoG Electrodes for Epilepsy Surgery. ( EpiGrid )

The objective of this prospective interventional monocentric clinical investigation is to evaluate the feasibility and performance of the flexible high-density SOFT ECoG electrode grids, manufactured by Neurosoft Bioelectronics SA (test device; TD), in comparison to regular high-density electrode grids (ADTech, CE-marked) (control device; CD) routinely used at the investigation site during epilepsy surgery.

Subjects will undergo ≥ 2 additional intracranial recordings pre- and post-resection with the TD next to the standard recordings with the CD during ECoG-tailored epilepsy surgery.

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Key information

Conditions

Focal Epilepsy Brain Diseases Central Nervous System Diseases Epilepsies, Partial Epilepsy Intraoperative Monitoring Nervous System Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University Medical Center (UMC) Utrecht

Utrecht, 3584CX, Netherlands

Location status: Recruiting

Location contact

Dr. G.J.M. (Maeike) Zijlmans Prof. Dr.

PRINCIPAL_INVESTIGATOR

Maryse van 't Klooster Study Coordinator, PhD

CONTACT

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Age ≥18 years at the time of enrolment
  • Lesional epilepsy (incl. secondary mesial temporal sclerosis) that is considered a candidate for intra-operative high-density grid recordings (incl. patients who underwent sEEG preceding resective surgery)
  • Provided informed consent for study participation by the subject

Exclusion criteria

  • Occipital lesion
  • Surgeries involving a primary mesial temporal lesion, a disconnection, or hemispherectomy.
  • Planned ioECoG recordings during fully awake surgery and/or functional recordings
  • Use of anticoagulants that cannot be discontinued during the perioperative period, or a factor XIII deficiency or any other haematological disease
  • Active participation in another investigational device study
  • Any other condition that in the opinion of the investigator may adversely affect the safety of the subject or would limit the subject's ability to complete the study.
  • Insufficient understanding of Dutch language.

Treatment and study plan

SOFT ECoG subdural grid electrode

Device

Test Device (SOFT ECoG subdural grid electrode): used for recording. During epilepsy surgery, in addition to standard clinical protocol (recording with comparator device), subjects will undergo ≥ 2 additional intracranial recordings with the SOFT ECoG flexible high density electrode grid (TD). Recording will be registered pre- and post-resection.

All procedures will be conducted according to standard clinical practice. Any medical decision making will be done using the standard of care CE-marked device (CD). The investigational, non-CE marked device is not used for clinical decision making.

Primary outcomes

  1. Background SNR pre-resection recording

    Time frame: up to 24 hours

    Performance in terms of signal quality is assessed via background signal to noise ratio (SNR). Only channels which record properly based on visual inspection (no noise, no flat line) will be included in the background SNR calculation. For the pre-resection recordings (SITUATION I/I*), the background SNR per (included) channel and the average SNR for the electrode grid will be calculated, and pairwise comparison will be conducted between TD (SITUATION I*) and CD (SITUATION I).

Secondary outcomes

  1. Electrode deficiency ratio (%)

    Time frame: up to 24 hours

    The individual electrodes will be classified, per recording, as poor or good signal quality based on visual criteria (i.e., noise, flat signal due to overlap with resection cavity or silicone of secondary electrode strip, pulsation artifacts). As a result, an electrode deficiency ratio (%) will be calculated as follows: # bad electrodes divided by the total # of electrodes per recording. This will be determined for the similar positioned CD recording (SITUATION I/II) to allow comparison with the TD (SITUATION I*/I**).

  2. Epileptic biomarker identification ( eg. number of spikes/HFOs per min, event SNR)

    Time frame: up to 24 hours

    After the surgery, spikes and high frequency oscilations (HFOs) will be visually marked in the final minute of the recording (note: assisted by automated spike/HFO detector) and checked by an expert. Marking of spikes and HFOs will be done in the TD and the corresponding CD recordings pre- and post-resection. Event rates (number of spikes/HFOs per minute) per channel and total per recording will be compared between the TD and CD. The average event SNR per channel and the average SNR per epileptogenic event type will be calculated per recording. The event SNR will be compared between the CD recording (SITUATION I/II) and the TD (SITUATION I*/I**).

  3. Background SNR of post-resection recordings

    Time frame: up to 24 hours

    The background SNR for post-resection recordings (SITUATION II/II**) will be computed and pairwise compared. Note that it shall be considered that for the post-resection recordings (SITUATION II/II**), in particular when measuring near/in the resection cavity, the performance of both the TD and CD for electrode deficiencies might differ significantly, positively and negatively.

  4. Surgical complications (e.g. SAEs/SADEs)

    Time frame: up to hospital discharge, on average at 10 days

    The safety analysis will include surgical complications in terms of device deficiencies (DDs) and serious adverse events (SAEs), and whether these are device related (SADEs).

  5. Usability evaluation

    Time frame: up to 48 hours

    A (digital) usability questionnaire (system usability scale + open questions) will be collected (within 48h after surgery).

Study contacts

Contact information is provided by the study sponsor or research team.

G.J.M. Zijlmans Study Principal Investigator, PhD

CONTACT

[email protected]

000 000-0000

Karolina Janikowska Clinical Affairs Manager, PhD

CONTACT

[email protected]

000 000-0000

Sponsors and collaborators

Lead sponsor

Neurosoft Bioelectronics SA

Industry

Collaborators

  • European Research Council
  • UMC Utrecht

Registry information

Official study title

The EpiGrid Study Evaluation of New Flexible High-density Intra-operative ECoG Electrodes for Epilepsy Surgery

Acronym: EpiGrid

Important dates

Study start
2025
Primary completion
2027
Study completion
2027
First posted
Jan 12, 2024
Registry last updated
Dec 10, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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