Wireless telemetry technology for implanting microdevices

• 1、School of Artificial Intelligence and Automation, Huazhong Univercity of Science and Technology, Wuhan 430074
• 2、School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Abstract：Aiming at the problem of wireless transmission of data in micro-implanted systems, the received energy is very limited due to the small size of the internal energy receiving/data sending coil, which is seriously mismatched with the external energy transmitting/data receiving large coil.Therefore, it is difficult to establish uplink (in vivo to in vitro) data links at medium and long distances. In this paper, a single coil group with carrier frequency wireless energy and reverse data time-sharing transmission scheme was used, and A strong pulse magnetic field (Pulse Magnetic Field, PMF) coupling is used to send the in vivo sensing data to the external energy transmitter/data receiver. First, the working principle of the PMF generating circuit is introduced. The auto-transformer is used to model and analyze the tapped coil to determine the relationship between the system output voltage boost gain and the coil structure parameters. The simulation and experimental results showed that the output pulse amplitude of the PMF generating circuit is not less than 30V under 3V input, and the amplitude of the induced voltage jump across the external energy transmission/data receiving coil can reach 3.2V, so that the Establish an effective uplink data link with the extracorporeal wearable energy sending/receiving large coil to realize the single carrier group wireless transmission of percutaneous energy and reverse data at the same carrier frequency.

Keywords： pulsed magnetic field, tapped coil, implantable device, Wireless telemetry