Endovascular BCI
Also: stentrode, stent-electrode array, vascular BCI, endovascular brain-computer interface
By neuraspeak editorial · Updated 2026-10-07 · 1 min read
An endovascular BCI is a brain-computer interface whose electrodes are delivered through the blood vessels, typically on a stent-like mesh placed in a vein next to the brain, so that brain signals can be recorded without opening the skull.
How is an endovascular BCI implanted?
The best-known example is the Stentrode, developed by Synchron. A catheter carries the device through the jugular vein in the neck up into the superior sagittal sinus, a large vein running along the top of the brain next to the motor cortex. There the self-expanding mesh opens and presses its electrodes, 16 in the current design, against the vessel wall. The procedure uses techniques similar to those interventional neuroradiologists use to treat stroke, rather than open brain surgery. Signals pass through the vessel wall to the electrodes and are transmitted wirelessly to an external computer for decoding.
What has an endovascular BCI achieved so far?
In sheep, a stent-electrode recorded cortical signals for up to 190 days with spectral content and bandwidth comparable to electrodes on the brain's surface outside the dura (Oxley et al., Nature Biotechnology 2016). In the first human report, two people with ALS used signals from attempted movements to produce mouse clicks, while an eye tracker moved the cursor, and completed tasks such as text messaging, online shopping, and managing finances (Oxley et al., Journal of NeuroInterventional Surgery 2021). In 2024 Synchron reported that its six-patient US COMMAND early feasibility study met its primary safety endpoint, with no device-related serious adverse events causing death or permanent increased disability over 12 months.
Why it matters for speech BCI
Endovascular BCIs trade signal detail for a less invasive procedure. The vessel wall sits between electrode and brain, and the device has far fewer electrodes than the Utah arrays or high-density ECoG used in record-setting speech studies. The peer-reviewed endovascular results cited here involve discrete selections such as clicks, used with on-screen keyboards, rather than decoding of attempted speech sounds. Whether endovascular recordings can support fluent phoneme-level speech decoding is an open question.
Questions
Does an endovascular BCI require brain surgery?+
It does not require opening the skull. It is still an invasive procedure, done through a catheter in the blood vessels, with a device permanently left in a vein.
Can a stentrode decode speech?+
The published human results cited here show communication by selecting items on a screen, not by decoding attempted speech. Direct speech decoding has been shown with ECoG and intracortical arrays.
Related: Brain-computer interface (BCI)Electrocorticography (ECoG)EEG vs intracortical recordingUtah array
Sources
- Oxley et al., Minimally invasive endovascular stent-electrode array for high-fidelity, chronic recordings of cortical neural activity, Nature Biotechnology 34, 320-327 · 2016
- Oxley et al., Motor neuroprosthesis implanted with neurointerventional surgery improves capacity for activities of daily living tasks in severe paralysis: first in-human experience, Journal of NeuroInterventional Surgery 13, 102-108 · 2021
- Healio, No serious adverse events reported with Synchron brain-computer interface at 12 months (COMMAND study, presented at the 2024 Congress of Neurological Surgeons) · 2024
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