Title :
Wireless power transfer for a miniature gastrostimulator
Author :
Young-Sik Seo ; Hughes, Zachariah ; Isom, D. ; Minh Quoc Nguyen ; Deb, Sujay ; Rao, Smitha ; Chiao, J.-C.
Author_Institution :
Electr. Eng. Dept., Univ. of Texas at Arlington, Arlington, TX, USA
fDate :
Oct. 29 2012-Nov. 1 2012
Abstract :
In this work, wireless power transfer issues were investigated for a gastroparesis management system consisting of an endoscopically-implantable miniature batteryless/rechargeable wireless gastrostimulator and a wearable battery-operated transmitter module. Output power for stimulation and input power consumption in the transmitter as well as the wireless power transfer efficiency of two coil antennas with significantly different sizes were examined. With an implant antenna coil of 1×3.5 cm2 and 5-cm radius transmitter antenna coils of varying coil turns, power transfers and efficiencies at the individually-tuned resonance of 1.3MHz were experimentally obtained at various coil separation distances from 4 to 10 cm between two coils. Taking power consumption in the wearable module and tolerance of parasitic capacitance in the environment into consideration, a 17-turn transmitter coil was chosen. RF losses through tissues were also examined with saline mimicking the abdomen tissues. At a distance of 10 cm as the worst scenario, a load current 3.02 mA was achieved which was still sufficient for gastrostimulation. Measurements of output voltage and efficiency distribution were mapped in 3-D to examine the effects of antenna misalignment due to body and stomach motion. This work provided insights into a complete system design for an endoscopically-implantable gastrostimulator that could relieve the suffering of many gastroparesis patients.
Keywords :
antennas; biological organs; biomechanics; endoscopes; inductive power transmission; medical disorders; power consumption; prosthetic power supplies; secondary cells; wireless channels; abdomen tissues; antenna misalignment; body motion; coil antennas; coil separation distances; endoscopical implant; gastroparesis management system; miniature batteryless gastrostimulator; power consumption; rechargeable wireless gastrostimulator; stomach motion; tissue RF loss; wearable battery-operated transmitter module; wireless power transfer; Coils; Implants; Transmitting antennas; Wireless communication; Wires; gastrostimulator; implant; inductive coupling; mapping; wireless power;
Conference_Titel :
Microwave Conference (EuMC), 2012 42nd European
Conference_Location :
Amsterdam
Print_ISBN :
978-1-4673-2215-7
Electronic_ISBN :
978-2-87487-026-2