Title :
A Remotely Powered Implantable Biomedical System With Location Detector
Author :
Kilinc, Enver G. ; Ghanad, Mehrdad A. ; Maloberti, Franco ; Dehollain, Catherine
Author_Institution :
Inst. of Electr. Eng., Ecole Polytech. Fed. de Lausanne, Lausanne, Switzerland
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. To tolerate 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 blocks. The implantable chip dissipates 595 μW and requires 1.48 V for start up.
Keywords :
CMOS analogue integrated circuits; amplitude shift keying; biomedical equipment; body sensor networks; controllers; prosthetic power supplies; CMOS technology; chip voltage regulator; communication system; custom designed receiver; data carrier drifts; efficient magnetic power transfer; free running oscillator; frequency 13.56 MHz; implant location; implant unit; implantable chip; implantable medical devices; location detector; magnetic field strength; mobile external unit controls; mobile unit; on-off key scheme; power 595 muW; rectified voltage level; remote powering link; remote powering system; remotely powered implantable biomedical system; sensor data; sensor-actuator blocks; size 0.18 mum; universal remote powering; voltage 0.9 V to 1.8 V; Coils; Couplings; Implants; Mobile communication; Power transmission; Transistors; Voltage control; CMOS analog circuit design; data communication; implantable biomedical system; implantable medical device; inductive link; integrated circuits; location detection; locator; power management; remote powering; wireless power transfer;
Journal_Title :
Biomedical Circuits and Systems, IEEE Transactions on
DOI :
10.1109/TBCAS.2014.2321524
