A remotely powered implantable biomedical system with location detector
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This document summarizes an implantable biomedical system that can be remotely powered and communicated with from an external mobile unit. The system uses magnetic coupling to transfer power and data between the implanted and external units. It also includes a location detection system that allows the external unit to align itself with 6mm resolution to maximize power transfer efficiency from the magnetic field. The implanted chip operates sensors/actuators and transmits data using amplitude shift keying modulation while tolerating carrier signal drifts. It has been fabricated in 0.18um CMOS technology and can be powered remotely at 13.56MHz while dissipating only 595uW of power.
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A remotely powered implantable biomedical system with location detector
- 1. A Remotely Powered Implantable Biomedical System With Location Detector Abstract: An universal remote powering and communication system is presented for the implantable medical devices. The system be interfaced with different sensors or actuators. A mobile external unit controls the operation of the implantable chip and reads the sensor's data. A locator system is proposed to align the mobile unit with the implant unit for the efficient magnetic power transfer. The location of the implant is detected with 6 mm resolution from the rectified voltage level at the implanted side. The rectified voltage level is fedback to the mobile unit to adjust the magnetic field strength and maximize the efficiency of the remote powering system. The sensor's data are transmitted by using a free running oscillator modulated with on-off key scheme. Totolerate large data carrier drifts, a custom designed receiver is implemented for the mobile unit. The circuits have been fabricated in 0.18 um CMOS technology. The remote powering link is optimized to deliver power at 13.56 MHz. On chip voltage regulator creates 1.8 V from a 0.9 V reference voltage to supply the sensor/actuator
- 2. blocks. The implantable chip dissipates 595 μW and requires 1.48 V for start up.