DocumentCode :
1713307
Title :
High resolution computations and measurements of potential EMI with models of medical implants and radiating sources
Author :
Bassen, Howard ; Casamento, Jon
Author_Institution :
Center for Devices & Radiol. Health, Food & Drug Adm., Rockville, MD, USA
Volume :
1
fYear :
2004
Firstpage :
75
Abstract :
We used high resolution finite difference time domain (FDTD) computer modeling to evaluate the potential of cellular phones to cause interference in an implanted cardiac pacemaker-defibrillator. The model consists of a combination of an 835 MHz source which is either (1) a special boat-mounted cellular phone antenna (a sleeve dipole fed by a 3 W amplifier) or (2) a standard EMI test model of a cellular phone handset (a dipole antenna placed 8 mm from the victim). The victim is a simplified model of a pacemaker-defibrillator with one insulated sensing/stimulation lead in a torso simulator. The handset model and the victim conform to the AAMI PC69 standard for pacemaker-defibrillator EMI testing. We compare the EMI-induced voltage in the victim from the sleeve dipole source with the induced voltage from a cellular phone handset model. We to performed experiments using the actual antennas to compare with the computed results. We used a fiber-optically linked pacemaker-defibrillator simulator to measure the induced voltage at the junction between the lead and the box of the pacemaker-defibrillator model. Our conclusions are that the sleeve dipole at 15 cm, driven by a 3 W amplifier, is less capable of causing potential interference than the handset. The sleeve dipole, with its 3 W amplifier, produces 12.7 dB less induced voltage in the victim than the phone handset model driven with 0.6 W. Our results are validated, since measured values differed by 1.7 dB or less from computed values. This is well within the uncertainties of the measurements and computations.
Keywords :
defibrillators; finite difference time-domain analysis; immunity testing; mobile handsets; pacemakers; radiofrequency interference; 0.6 W; 15 cm; 3 W; 8 mm; 835 MHz; EMI test model; EMI-induced voltage; FDTD computer modeling; cardiac pacemaker-defibrillator; cellular phone antenna; fiber-optically linked pacemaker-defibrillator; finite difference time domain computer modeling; immunity testing; medical implants; radiating sources; sleeve dipole; torso simulator; Cellular phones; Dipole antennas; Electromagnetic interference; Finite difference methods; Implants; Insulation; Telephone sets; Testing; Time domain analysis; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electromagnetic Compatibility, 2004. EMC 2004. 2004 InternationalSymposium on
Print_ISBN :
0-7803-8443-1
Type :
conf
DOI :
10.1109/ISEMC.2004.1349999
Filename :
1349999
Link To Document :
بازگشت