Wireless neural telemetry

Wireless neural telemetry is the radio (or optical) link that carries neural data out through intact skin, replacing the percutaneous connector whose skin breach is a chronic infection risk. Common bands are the MedRadio / MICS band around 402 to 405 MHz for regulated medical links, the 900 MHz and 2.4 GHz ISM bands, and ultra-wideband for very high data rates; the link is usually bidirectional so parameters and, in bidirectional devices, stimulation commands can be sent in.

The hard constraint is the uplink data rate. Raw broadband neural data scales as channels times bandwidth times bits, so a thousand-channel wideband stream can demand hundreds of megabits per second — often infeasible to transmit through tissue within the implant's power budget. This is precisely what forces on-chip spike detection and compression: the cheapest bits are the ones never sent.

Beyond raw rate, telemetry fights tissue path loss, antenna miniaturisation, and the fact that the transmitter's power adds directly to the implant's thermal budget. Ultra-low-power uplinks therefore often use backscatter or load modulation — reflecting or modulating an externally supplied carrier rather than generating one — so the implant spends almost no energy on the radio itself.