2.4. Water System Precautions
The water system is used to keep the rectal wall cool during treatment. The water temperature is monitored
by the system and is displayed on the workstation screen.
During treatment, the operator must be aware of the following:
◼ Attend to any system alert to a malfunction in the water system.
◼ Confirm that the circulation has restarted in between sonications and that the water temperature is
adequate.
2.4.1. Temperature Rise Precautions
A malfunction in the water system during operation could cause the water to warm up rather than being
cooled to the proper operating temperature. This situation may cause one or both of the following hazards:
◼ Harm to the patient
◼ Damage to the transducer
The Water system status (Cooling / Paused) and water temperature are presented in the Exablate Prostate
Workstation Device Status Bar. When the temperature of the water is higher than the desired set point by
2 degrees or more, the workstation will alert the operator. If this happens, verify water system status is set
to ‘Cooling’ and wait for it to cool down to the desired temperature, before continuing the treatment.
If the problem persists, contact technical support.
The balloon water may start warming as a result of a prolonged sonication sequence. Keep
a close watch on the water temperature at the Exablate workstation console and avoid
sonicating when water temperature is above the desired level.
[W-8]
2.4.2. Balloon Volume Precautions
The balloon covering the probe is designated to hold circulating cold water for keeping the rectal wall safe.
During the treatment, it is inflated to provide acoustic coupling with the rectal wall. However, during
insertion, extraction or repositioning of the probe, the balloon should be drained to minimize the probe
diameter while passing through the anus.
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