SIGNAL SOURCES FOR SIMULATION, TESTING, AND CALIBRATION - Design and Development of Medical Electronic Instrumentation - page 290

EAS SYSTEM

OSCILLATOR

TELEMETRY
COIL

IMPLANTABLE
PACEMAKER

RV PACING CIRCUIT

EAS TRANSMITTER ANTENNA

4700pF

RA PACE UNI/ BIPOLAR

PACEMAKER
PACING LEAD

LEAD's INDUCTANCE PACEMAKER

CONTROL LOGIC

RV TIP

RV SENSE UNI /BIPOLAR

RV RING

LED

4700pF

EAS RECEIVER ANTENNA

PACEMAKER VDD PACEMAKER VSS

TITANIUM
CAN

Magnetic
Reed Switch

LiI Battery

EAS RECEIVER

Figure 6.29 A ventricular bipolar pacemaker lead with a LED does not make a good simulation setup to evaluate how electromagnetic envi-
ronments such as those generated by electronic article surveillance systems (EAS) interfere with implantable pacemakers and de

brillators.
The LED acts as the detector diode in a crystal radio. Interfering signals are then demodulated by the LED, giving a false indication that the
device is susceptible to electromagnetic interference.

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A torso simulator model standard is now used by the pacemaker industry. The setup is
described in ANSI/AAMI standard PC69:2000 ( EMC Test Protocols for Implantable
Cardiac Pacemakers and Implantable Cardioverter De

brillators ), Annex B, and was
based on research by Ruggera et al. [1997]. Figure 6.30 shows a torso simulator that our
colleague Paul Spehr constructed based on the standard to test the immunity of pacemak-
ers against cellular telephone interference. The materials used were:

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• White louver light grid (nonconducting), Home Depot part 074567432008
• Under-bed box 28-qt/27-L Sterilite No.1856 white, 23 4 in. 17 in. 6 in.

15 cm)
• Stainless steel nuts and bolts, 10-24

(59 cm 43 cm

2 in. Phillips head and nut, four each

• Titanium sheet
• Silicone adhesive sealant
• Four-foot nylon threaded rod, 2 -13