Philips EPIQ 7 User Manual page 32

Safety Electrical Safety
WARNING
Electrosurgical units (ESUs) and other devices intentionally introduce radio frequency
electromagnetic fields or currents into patients. Because imaging ultrasound frequencies are
coincidentally in the radio frequency range, ultrasound transducer circuits are susceptible to
radio frequency interference. While an ESU is in use, severe noise interferes with the black-
and-white image and completely obliterates the color image. Concurrent failures in an ESU or
other device and in the outer layer of the TEE transducer shaft can cause electrosurgical
currents to return along the transducer conductors. This could burn the patient, and the
ultrasound system and the transducer could also be damaged. Be aware that a disposable
transducer cover provides no protective electrical insulation at ESU frequencies.
WARNING
To avoid risk of a burn hazard, do not use transducers with high-frequency surgical
equipment. A burn hazard may result from a defect in the high-frequency surgical neutral
electrode connection.
WARNING
Using cables, transducers, and accessories other than those specified for use with the system
may result in increased emissions from, or decreased immunity of, the system.
CAUTION
Although your system has been manufactured in compliance with existing EMI/EMC
requirements, use of this system in the presence of an electromagnetic field can cause
momentary degradation of the ultrasound image. When interference is present or
intermittent, use caution when continuing to use the system. If interference occurs often,
review the environment in which the system is being used, to identify possible sources of
radiated emissions. These emissions could be from other electrical devices used within the
same room or an adjacent room. Communication devices such as cellular phones and pagers
can cause these emissions. The existence of radio, TV, or microwave transmission equipment
located nearby can cause emissions. In cases where EMI is causing disturbances, it may be
necessary to relocate your system.
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