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 294.
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,
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Transesophageal Transducers
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