Relevant for Research Area

B - Core Technologies


The SEAM-WiT project addresses the challenge of designing an efficient versatile telemetry system for providing a bidirectional wireless data- and power link between an external unit and a biomedical implant. The main goals of the overall system are to guarantee the patient’s comfort with a small system volume, a low specific absorption rate (SAR) for avoiding tissue damaging and a high power transfer efficiency for increasing system lifetime. The system architecture includes an external unit (primary side), which can serve as a handheld device, useable by a physician. This enables to power biomedical implants wirelessly and to accomplish wireless electrophysiological readout, avoiding transcutaneous wired connections. In addition, the system comprises a unit that is intended to be connected to a biomedical implant (secondary side). The primary and secondary sides establish a wireless power and data transmission system.

Research Status

The dynamic impedance matching on the primary side power converter handles the outstanding impedance ratio of 1:40, which is 333% compared to state of the art designs, and accomplishes 90% efficiency over a broad range of input impedances. This makes the system very insensitive to deviation from the nominal coil alignment and fluctuations in the implant power consumption.

Stöcklin S, Yousaf A, Volk T, Reindl L (2016) Efficient Wireless Powering of Biomedical Sensor Systems for Multichannel Brain Implants. IEEE Transactions on Instrumentation and Measurement, volume: 65, issue: 4, pp. 754-64.