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Abstract #2762

MRI-Induced Vibrations in Active Implantable Medical Devices: Effect on the Device

Ramez E. N. Shehada1, Rohan More1, Reza Imani1, Wudi Zhou1, Micah Meulmester1, Benjamin Coppola1, Jon Dietrich1, Richard Williamson1, Ali Dianaty1

1CRMD, St. Jude Medical, Sylmar, CA, United States

Gradient-induced vibrations can fatigue the components of MRI-conditional active-implantable medical devices (AIMD) leading to their failure. A non-contact vibrometer was used in a special fixture to measure the vibrations of various AIMD components in clinical 1.5T MRI scanners. The frequency range of the vibrations ranged from 0-2kHz with a maximum displacement of 25um. The vibration values were then programmed into a computerized shaker-table that was used to aggressively vibrate the AIMD for longer periods of time after which the AIMD was checked for damage. This study presents a new method for characterizing the vibrations and assessing their effects on AIMD.

Keywords

acceleration accelerometers acquisition active aimed analog analyzed automated battery beam bore breakdown captures characterize checked clinical close coil commonly component components composed comprehensive concluded conditional conductive contact damage dampened density depending designed determine determined develop device devices digitized directing displacement eddy electrically emitted entire entrance especially evaluating evaluation exposure failure fatigue field fields fixture freq frequencies frequency functional generate generates generating gradient half hazard highest implantable in vivo induced instruments interaction intermediate known latter lead light location magnitude manufactures measure measured measuring medical namely national noise objective opened optical output pacemaker partial passed peak position positioned power presence probe proceedings programmable report reported represent resonant running safety scanner scanners shaker special specifically spectrum static strong survive survived switching symphony system table telemetry tissue typical upon various vibrate vibration vibrations waveform worst