StairMed

Ultra-flexible BCI, implantable brain-machine interface

CNprivateest. 2021stairmed.com (opens stairmed.com)Checked 10 Oct

The brief

Analyst view
  • First China prospective BMI trial completed (2025); three implants.
  • Raised 860M+ yuan: 350M from Series B (Feb 2025), 500M Alibaba round (Apr 2026).
  • Ultra-flexible electrodes 1% human hair width; 1/5 Neuralink's size. 3-5mm skull access needed.

Technical approach

As reported
Ultra-flexible electrodes

Nano-scale electrode design

1% hair width, 1/5 competitor size, hundreds times softer. Reduces immune response.

Minimally invasive

Small implant footprint

Implant is 26 mm in diameter and less than 6 mm thick. Requires only a 3-5 mm skull perforation and electrode placement 5-8 mm deep in the brain.

Clinical capability

Motor and sensory decoding

Decodes motor cortex signals. Quadruple amputee controlled racing game in trials.

Primer