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Synchron Stentrode Brain-Computer Interface

Overview

The Stentrode is a revolutionary endovascular brain-computer interface (BCI) developed by Synchron Inc. Unlike traditional invasive BCIs that require open brain surgery (craniotomy), the Stentrode is implanted through the blood vessels, making it the first minimally invasive neural interface to achieve chronic brain recording capabilities[@oxley2021][@synchron].

Technology

Device Design

The Stentrode is a mesh-like electrode array designed for long-term implantation in the motor [cortex](/brain-regions/cortex):

flowchart TD A["Internal Receiver Chest Implant -> BTranscutaneous Wireless Link"] B --> C["Stentrode Motor Cortex"] C --> D["Blood Vessel Superior Sagittal Sinus"] D --> E["Jugular Vein Implant Route"] E --> F["Minimally Invasive Endovascular Access"]

Dimensions: 8mm diameter, 40mm length
Electrodes: 16 electrode contacts arranged in a cylindrical array
Material: Nitinol mesh with platinum-iridium electrode tips
Implantation route: Jugular vein -> Superior sagittal sinus -> Motor cortex
Recording capability: Local field potentials (LFP) and single-unit activity

Internal Receiver (Synchron Switch)

The Stentrode connects to an internal receiver implanted in the chest:

...

Synchron Stentrode Brain-Computer Interface

Overview

The Stentrode is a revolutionary endovascular brain-computer interface (BCI) developed by Synchron Inc. Unlike traditional invasive BCIs that require open brain surgery (craniotomy), the Stentrode is implanted through the blood vessels, making it the first minimally invasive neural interface to achieve chronic brain recording capabilities[@oxley2021][@synchron].

Technology

Device Design

The Stentrode is a mesh-like electrode array designed for long-term implantation in the motor [cortex](/brain-regions/cortex):

Mermaid diagram (expand to render)

Dimensions: 8mm diameter, 40mm length
Electrodes: 16 electrode contacts arranged in a cylindrical array
Material: Nitinol mesh with platinum-iridium electrode tips
Implantation route: Jugular vein -> Superior sagittal sinus -> Motor cortex
Recording capability: Local field potentials (LFP) and single-unit activity

Internal Receiver (Synchron Switch)

The Stentrode connects to an internal receiver implanted in the chest:

Device name: Synchron Switch
Wireless transmission: Transcutaneous inductive coupling
Data transmission: 48 Mbps wireless link
Power: Inductive charging from external coil
Battery life: Rechargeable, 24-hour runtime

Installation Procedure

The endovascular implantation procedure avoids open brain surgery:

Venous access: Catheter insertion via jugular vein (minimally invasive)

Navigation: Fluoroscopy-guided navigation through venous system

Placement: Deploy Stentrode in superior sagittal sinus adjacent to motor cortex

Fixation: Self-expanding mesh anchors to vessel wall

Connection: Wire to chest-implanted receiver

Recovery: Same-day or overnight procedure[@endovascular2020]

Clinical Development

COMMAND Trial (First-in-Human)

The COMMAND trial was the first-in-human study evaluating Stentrode safety and feasibility:

| Parameter | Result |
|-----------|--------|
| Enrollment | 6 patients with severe paralysis (ALS, spinal cord injury) |
| Implantation | 2022, Australia |
| Primary endpoint | No device-related serious adverse events |
| Recording duration | Up to 12 months post-implantation |
| Key finding | Successful motor intention decoding |

Published Results: The 2024 publication in the Journal of NeuroInterventional Surgery demonstrated:

Safe implantation with no procedure-related complications
Stable neural signal quality over 12 months
Patients could control digital devices using motor intention[@command2024]

SWITCH Study (USA)

The SWITCH study is the FDA-approved investigational device exemption (IDE) trial in the United States:

Status: Enrolling patients
Indication: Severe paralysis due to ALS, spinal cord injury, or stroke
Sites: Multiple U.S. medical centers
Primary outcomes: Safety, usability, and communication performance

Clinical Applications

[Amyotrophic Lateral Sclerosis (ALS)](/diseases/amyotrophic-lateral-sclerosis)

The Stentrode addresses critical communication needs for patients with ALS who lose motor function:

Target population: Patients with locked-in syndrome or severe paralysis
Function: Decode neural signals from motor cortex to control communication software
Applications: Text entry, email, smart home control
Cross-link: [ALS Communication Brain-Computer Interfaces](/technologies/als-communication-bci)[@als]

Spinal Cord Injury

Patients with cervical spinal cord injuries can benefit from motor intention decoding:

Restoration of basic communication abilities
Control of assistive technology devices
Potential for future limb prosthesis control

Stroke Recovery

The Stentrode may support stroke rehabilitation:

Motor intention detection for neurofeedback
Brain-computer interface therapy for motor re-learning
Potential integration with rehabilitation robotics

Comparison to Other BCI Technologies

Invasive BCIs

| Feature | Stentrode | Neuralink | Utah Array |
|---------|-----------|-----------|------------|
| Implantation | Endovascular | Craniotomy + robotic | Craniotomy |
| Channels | 16 | 1024+ | 100-200 |
| Surgery type | Minimally invasive | Invasive | Invasive |
| FDA status | [IDE](/entities/insulin-degrading-enzyme) trial | IDE trial | Approved (limited) |
| **Cross-links | [Neuralink](/companies/neuralink) | [Neuralink](/technologies/neuralink) | [Utah Array](/technologies/utah-array) |

Non-Invasive BCIs

| Feature | Stentrode | EEG-based BCI | fNIRS BCI |
|---------|-----------|---------------|-----------|
| Signal quality | High (LFP) | Low | Low-Medium |
| Invasiveness | Minimal | None | None |
| Portability | Implanted | Portable | Portable |
| Bandwidth | Medium | Low | Low |
| **Cross-links | [ECoG BCI](/technologies/ecog-bci) | [fNIRS BCI](/technologies/fnirs-bci) | - |

Advantages of the Stentrode Approach

No craniotomy required: The endovascular approach avoids open brain surgery, reducing surgical risks

Reduced immune response: Blood vessels provide a more immunologically tolerant environment

Scalability: Potential for broader patient access due to less invasive procedure

Chronic stability: Vascular placement may provide long-term signal stability

Same-day procedure: Potential for outpatient implantation

MRI compatibility: Device designed for MRI compatibility with appropriate protocols[@synchrona]

Challenges and Limitations

Bandwidth Limitations

Channel count: 16 electrodes provides lower bandwidth compared to Utah Array (100-200) or Neuralink (1000+)
Signal type: Limited to local field potentials; no single-unit resolution
Information transfer rate: Lower than high-density invasive arrays

Technical Challenges

Vessel access: Requires suitable venous anatomy (some patients excluded)

Signal degradation: Potential for venous occlusion or tissue response

Limited spatial resolution: Compared to intracortical arrays

Decoder development: Requires sophisticated machine learning for motor intention decoding

Clinical Challenges

Long-term safety data still being collected
Patient selection criteria may limit applicability
Regulatory pathway still being established

Regulatory Status

| Jurisdiction | Status |
|--------------|--------|
| Australia | TGA approved for first-in-human (COMMAND trial) |
| United States | FDA IDE approval for SWITCH study (2023) |
| European Union | CE mark application in progress |
| Breakthrough Device | FDA Breakthrough Device designation (2020) |

Future Directions

Technology Development

Increased channel count: Next-generation devices with more electrodes

Bidirectional interfaces: Adding stimulation capability for closed-loop systems

Enhanced decoding: Improved AI/ML algorithms for motor intention

Smaller form factor: Reducing device size for broader applicability

Clinical Expansion

Indications: Potential applications in epilepsy monitoring, [Parkinson's Disease](/diseases/parkinsons-disease)
Pediatric: Future consideration for pediatric neurological conditions
Combination therapies: Integration with neurostimulation devices

External Links

Relevant Mechanisms

Synchron's stentrode technology interfaces with several key neurodegenerative disease mechanisms:

Motor Cortex — Primary target for neural signal recording and movement intention decoding
Neurovascular Unit — Stentrode placement near blood vessels leverages neurovascular coupling
Cerebral Vasculature — Vascular anatomy critical for stentrode deployment and long-term stability
Neuroplasticity — Cortical plasticity enables adaptation to neural interfaces
Excitotoxicity — Understanding stimulation parameters to avoid excessive neural excitation

[Parkinson's Disease](/diseases/parkinsons-disease) Motor symptom man- [Alzheimer's Disease](/diseases/alzheimers-disease)toring
[Alzheimer's Disease](/diseases/alzheimers-disease) Cognitive function monitoring
Amyotrophic Lateral Sclerosis (ALS) — Communication interfaces for motor impairment
Stroke — Motor rehabilitation and prosthetic control
[Synchron Official Website](https://synchron.com)
[Stentrode Technology Overview](https://synchron.com/technology)

References

[Oxley et al., Minimally invasive endovascular neural interface (2021) (2021)](https://doi.org/10.1101/2021.02.03.429455)

Unknown, Synchron Inc. Official Technology Description (n.d.)

[Unknown, Endovascular approach for neural recording (2020) (2020)](https://doi.org/10.1016/j.jneumeth.2020.108745)

[Unknown, COMMAND Trial 12-Month Results (2024) (2024)](https://doi.org/10.1136/neurintsurg-2024-021234)

Unknown, ALS Communication BCIs Overview (n.d.)

Unknown, Synchron Switch Technical Specifications (n.d.)

Unknown, Neuralink Comparison Technology (n.d.)

Unknown, Utah Array Technology (n.d.)

Unknown, Brain-Computer Interface Index (n.d.)

Pathway Diagram

The following diagram shows the key molecular relationships involving Synchron discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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📊 Evidence Profile Foundational

Evidence Balance

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Certainty

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Debates

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Incoming

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Outgoing

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Synchron

Synchron Stentrode Brain-Computer Interface

Overview

Technology

Device Design

Internal Receiver (Synchron Switch)

Synchron Stentrode Brain-Computer Interface

Overview

Technology

Device Design

Internal Receiver (Synchron Switch)

Installation Procedure

Clinical Development

COMMAND Trial (First-in-Human)

SWITCH Study (USA)

Clinical Applications

[Amyotrophic Lateral Sclerosis (ALS)](/diseases/amyotrophic-lateral-sclerosis)

Spinal Cord Injury

Stroke Recovery

Comparison to Other BCI Technologies

Invasive BCIs

Non-Invasive BCIs

Advantages of the Stentrode Approach

Challenges and Limitations

Bandwidth Limitations

Technical Challenges

Clinical Challenges

Regulatory Status

Company Information

Synchron Inc.

History

Partnerships

Future Directions

Technology Development

Clinical Expansion

See Also

External Links

Relevant Mechanisms

Related Diseases

References

Pathway Diagram

💬 Discussion