A System for Wireless Power Transfer of Micro-Systems In-Vivo Implantable in Freely Moving Animals

Abstract

Abstract-A system for wireless power transfer of microsystems in-vivo implantable in small animals is presented. The described solution uses a servo-controlled transmitter moved under the animal moving space. The solution minimizes the power irradiation while enabling animal speeds up to 30 cm/s. An x-y movable magnetic coil transmits the required power with a level able to keep constant the received energy. A permanent magnet on board of the implantable micro-system and an array of magnetic sensors form a coil tracking system capable of an alignment accuracy as good as 1 cm. The power is transferred over the optimized remote powering link at 13.56 MHz. The received ac signal is converted to dc voltage with a passive fullwave integrated rectifier and the voltage regulator supplies 1.8 V for the implantable sensor system. Experimental measurement on a complete prototype verifies the system performance.Index Terms-Remote powering, wireless power transfer, implantable electronics, multi-sensor system, monitoring system, implantable micro-system, servo-controlled power transfer, x-y rails, biomedical implant, system for freely moving animal, remotely powered sensor systems, in-vivo implantable system.

A System for Wireless Power Transfer and Data Communication of Long-Term Bio-Monitoring

“…Therefore, the transmitted power needs to be increased to keep the received power at the constant level by the implantable system. This study proposes a servo-controlled wireless power transfer system to transfer the power efficiently [29], [30]. The servo-controlled system can track the animal inside the living space and moves the powering coil under the animal position.…”

Full system for translational studies of personalized medicine with free-moving mice

“…In this second approach, we propose a servo-controlled remote powering system that locates the animal in the cage and delivers the power to the implantable system efficiently [7]. Fig.…”

Full Fabrication and Packaging of an Implantable Multi-Panel Device for Monitoring of Metabolites in Small Animals

“…1 shows the scenario of the implantable sensor system for the freely moving animal. The IRPower system consists of detection and movement blocks [15], [16]. The detection block is used to find and track the animal in the living space.…”

“…5 shows the optimized inductively coupled power link, where the implanted coil is showed on the top of the powering coil for a better comparison. The sizes of the powering and implanted coils are 80 80 mm and 12 12 mm, respectively, and the power transfer efficiency is limited over 30 mm distance [16]. …”