SIAT NeuroWorm movable fibre electrode
- Record ID
- BTSD-ACAD-0093
- Reviewed
- 2026-10-09
- Interface
- other
- Evidence stage
- preclinical
Independent, source-linked catalog sheet. Not a manufacturer-issued datasheet, regulatory decision or instructions for clinical use. Human evidence does not establish approval. Source-specific restrictions, conflicts and missing specifications are retained below.
SIAT NeuroWorm movable fibre electrode
A multichannel fibre electrode that can be moved after implantation. It was built by Liu Zhiyuan and Han Fei’s group with Xu Tiantian’s magnetic-microrobot group at the Shenzhen Institute of Advanced Technology (SIAT, CAS), and Yan Wei at Donghua University. Facts here come from SIAT’s Chinese release (18 September 2025) and the Nature abstract (Europe PMC, PMID 40962980). The Nature full text was not read, so the electrode material stack and per-channel impedance are blank.
Identity
| Field | Value and source scope |
|---|---|
| Device | NeuroWorm: soft, stretchable, movable microfibre with longitudinally distributed electrode arrays for bioelectrical and biomechanical monitoring [1][2] |
| Origin | SIAT (first institution), with Donghua University; five years of joint work [1] |
| Interface class | Fibre electrode moved by an external magnetic field inside brain or on and in muscle [1] |
| Species studied | Rabbit (steered through the skull-contained brain) and rat (leg muscle) [1][2] |
| Regulatory status | Research device. The same group reports a separate stretchable body-surface electrode array that has passed Class II device testing [1]. That product is not this implant |
Geometry and architecture
| Field | Value and source scope |
|---|---|
| Electrode count | 60 independent channels along the fibre [1] |
| Diameter | 196 µm [1] |
| Construction | Ultrathin film (hundreds of nanometers thick) patterned with conductive traces, then rolled into a fibre [1][2] |
| Steering | A small magnetic head at one end; a precision magnetic control system with real-time image tracking sets direction [1] |
| Electrode material and insulation | |
| Site size and pitch |
Performance envelope
| Field | Value and source scope |
|---|---|
| Muscle chronic | Stable recording beyond 43 weeks in rat leg muscle (release and abstract); encapsulation still negligible at 54 weeks (abstract) [1][2] |
| Tissue response | At 13 months the fibrous capsule averaged under 23 µm, with apoptosis comparable to normal tissue; a stainless steel wire control exceeded 451 µm with marked apoptosis (release) [1] |
| Dynamic targeting | In rabbit brain the fibre was steered to change monitored site; on muscle it moved daily for a week [1] |
| Stated challenges | Immune rejection, long-term stability, drive method, speed control, materials and function integration remain research topics [1] |
Limits
Animal only. The release and abstract do not give per-channel impedance, signal amplitude or yield. No human use is reported.
References
- SIAT (Chinese), Nature | 深圳先进院发明动态”神经蠕虫”功能纤维电极, 18 September 2025.
- A movable long-term implantable soft microfibre for dynamic bioelectronics, Nature (2025), DOI 10.1038/s41586-025-09344-w, PMID 40962980 (abstract via Europe PMC).