Handheld bio-electrical interface
The Core started as a literal question. Bill was holding a wireless charging pad and asked why, if a phone can be charged through a coil, a person cannot be. The honest answer is that we have no receiving coil and an induction field strong enough to move our ions would cook tissue before it did anything useful. But the question survives being answered, because there are three things that reach a nerve from outside the skin, and nobody had put them in the same enclosure on the same clock.
What came out is a 75 mm disc you hold between both palms. The palms are not sentimental: they carry one of the densest sensory maps in the body, they are wired to the somatosensory cortex through the median and ulnar nerves, and they are the one place you can apply cold, light and a magnetic field at once without a strap.
The size is set by physics, not by taste. Shrink the Peltier and it heat-soaks instead of staying cold. Shrink the coil and it needs more current to reach the same depth, which the cell cannot give. Sixty millimetres by twelve is the floor, and below that the device stops doing the thing it exists to do.
Layer stack, component list with manufacturer part numbers, functional block diagram and firmware mode table are written. No prototype has been built.
Architecture
What is in it
ORRA Core carries 6 functional layers. Every named part is a real manufacturer part number, chosen once for the family and reused, so one qualification covers every unit that uses it.
Medical-grade thermally conductive silicone skin, ISO 10993 class
Carries the bio-impedance contact points
12x high-power SMD LEDs — 6x 660 nm red, 6x 810 nm near-infrared
OSRAM GH CSSRM4.24 / SFH 4715S on a ring MCPCB
40 x 40 mm Peltier thermoelectric module on ceramic substrate
TEC1-04903, driven bipolar so it heats or cools
Flat copper Litz-wire pancake coil, 50 turns
1.8 mT at the surface
Nordic nRF52840 MCU, TI DRV8833 H-bridge, TI CSD18504Q5A coil driver
0.2 mm ferrite sheet isolates the coil from the board
2500 mAh Li-Po (custom flat LP604040) + TI BQ25895 PMIC + Qi receiver
Charges on the same pads that started the idea
| Reaches | Worn or held | Calibration | Cost concept |
|---|---|---|---|
| Median nerve, Ulnar nerve | Between both palms | Bio-impedance, before every session | $116 at 100-unit factory-direct run |
Source drawing
The sheet this page was built from
Everything above was read off one working drawing. It is published here whole, annotations included, so the specification and its source can be checked against each other rather than taken on trust.
Honest position
What we are not saying
ORRA Core is a general wellness concept. It is not a medical device, it has not been evaluated by the FDA, and it is not intended to diagnose, treat, cure or prevent any disease. No unit has been manufactured, no certification listed on this site is held, and no human data of any kind exists.
The concept retail price of $299 is a design target set against a bill of materials. It is not an offer and there is nothing to buy.
Ready to look at the engineering?
The layer stack, the component list with manufacturer part numbers and the mode table are written down. Ask and you get the same document a contract manufacturer would.
See what it would cost
Concept retail against a real bill of materials, with the margin shown rather than implied.
Pricing →Start with the science
Three physical layers, six set points, one calibration baseline. Ninety seconds of reading.
How it works →