Philips epiq 7, User Manual

Page: 237 / 318

Testing TEE Transducer Leakage Current
For a list of the equipment needed to perform the electrical safety test procedure, see “TEE
Test Background” on page 234 .
WARNING
Only a technically qualified person should perform this procedure.
1. Gather the equipment in the preceding list.
2. Fill the basin to the fill line with saline solution.
3. Place the distal tip and shaft of the transducer into the basin.
4. Connect the transducer to the system.
5. Plug the ultrasound system’s power cord into the test receptacle on the safety analyzer.
6. Attach a lead from the safety analyzer binding post labeled RL to a metal plate submerged
in the basin.
7. On the safety analyzer, set the Leads switch to RL. Set the Line Polarity switch (S2) to
NORMAL.
8. Turn on the safety analyzer and the ultrasound system.
9. Set the Mode switch (S3) on the safety analyzer to the Case Leakage - Ground Conductor
position. Press the Lift Ground switch (S1) on the safety analyzer and record the chassis
leakage current.
10. Set the Mode switch (S3) on the safety analyzer to the ECG position. Press the Lift Ground
switch (S1) on the safety analyzer and record the patient leakage current.
The transducer fails the test if the patient leakage current recorded in step 10 is greater than
80% of the chassis leakage current recorded in step 9.
This failure indicates that there is a hole in the insulating layer of the TEE shaft. A hole enables a
conductive pathway to internal metal parts of the transducer and presents a potentially
hazardous condition to a patient undergoing external defibrillation or electrosurgery. A hole
also allows invasion of organic material, making it difficult to completely disinfect all portions of
the transducer. For these reasons, the transducer must be repaired before it is used.
TEE Leakage Current Test Transesophageal Transducers
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