Jason Meyers1, David Prutchi1, and Ramez Shehada2
1Impulse Dynamics (USA) Inc., Marlton, NJ, United States, 2Medical Technology Laboratories, La Mirada, CA, United States
1Impulse Dynamics (USA) Inc., Marlton, NJ, United States, 2Medical Technology Laboratories, La Mirada, CA, United States
The input impedances at 63.87 MHz of six MR-conditional cardiac
IPGs were measured and found to be low and comparable, suggesting that impedance is not
intentionally added by device manufacturers to
limit RF-induced electrode heating.
Figure 2: This test fixture was constructed to allow direct measurement
of the impedance between an IPG’s header connector block and Can. Also shown
are the IPGs modified to provide direct access to terminal blocks to allow this
measurement.
Figure 1: Simplified diagram showing the RF current circulation paths
that cause tissue heating.
