Bridge Neurotech is recruiting for its first human research study as it develops an ultrasound brain-computer interface. The central question is whether useful images can be obtained through an intact skull. Healthy adults form one study group; people who already have certain skull implants provide a reference because those implants transmit sound more easily than bone.
The startup has announced $13.5 million in funding in its October founder letter. A separate October 6 announcement with Butterfly Network confirms a multi-year research and development agreement. The Next Web covered the launch on October 7. These developments support research; they do not establish a finished communication device.
Sensing blood flow comes before decoding an instruction
Bridge's technical explanation describes functional ultrasound as sending sound pulses and measuring returning echoes. Changes in echoes from moving red blood cells provide a signal related to blood flow. The approach infers activity through a physiological response, rather than recording individual neurons directly.
There are two separate engineering tasks. Bone scatters and absorbs sound differently across people, complicating image formation. Then a decoding model must turn the images into useful information in real time and work across individuals. Bridge identifies both as unresolved challenges.
Butterfly will license its programmable Ultrasound-on-Chip technology through Butterfly Embedded. The agreement includes technology-access and development-milestone payments, plus hardware purchase commitments. A semiconductor platform gives Bridge something to develop on; it does not itself demonstrate either intact-skull imaging performance or reliable decoding.
Two groups help distinguish the imaging conditions
Bridge's study page calls the work observational, with no treatment or diagnosis. It describes a small probe held against the head while participants listen, watch, move or speak on cue.
| Participant group | Role described by Bridge |
|---|---|
| Healthy adults | Study brain imaging through an intact skull. |
| Adults with an existing PEEK or Longeviti cranioplasty implant | Provide recordings through a material that passes sound more readily, for comparison with measurements through bone. |
The second group has already undergone skull reconstruction; the study description does not propose implanting a device in healthy volunteers. This distinction explains why implant recipients appear in research pursuing a non-invasive interface.
The evidence to watch is how well the measurements work through intact skulls across participants, followed by how reliably a decoder can use them. Collecting images during prompted tasks is an earlier step than demonstrating dependable communication. Readers following the project should look for those results separately, rather than treating enrollment, financing or a component agreement as proof that both problems are solved.
Sources
Research note: This account uses the companies' documentation. TechKili has not tested the investigational system or independently verified imaging, decoding or clinical outcomes.
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