BTG Visual-ICE, Руководство пользователя

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Visual-ICE™ Cryoablation System
4-19
4.5 Changing Gas Cylinders during a Procedure
If it becomes necessary to replace a gas cylinder during a procedure, stop all freezing and thawing
operations.
4.5.1 Standard Gas Cylinder Setup
1. Plan the appropriate time to make a cylinder change by estimating the gas required to complete
the procedure. The Gas Indicator on the
Navigation Tool Bar
indicates how much time is
remaining in each gas cylinder based on the selected gas flow intensity, type and number of
needles being used. Also, consider the number of planned freeze-thaw cycles for the procedure.
2. Safely position a full gas cylinder, with the required gas type and purity, near the empty cylinder.
3. Close and tighten the cylinder valves of both gas cylinders.
4. Slowly open the Manual Vent Valve to discharge gas from the system and the high pressure
gas supply line. Wait until all the pressure is released and both gauges on the gas supply lines
indicate zero pressure.
5. Use the wrench to remove the gauge assembly from the empty cylinder.
6. Connect the gauge assembly to the full cylinder.
7. Close and tighten the Manual Vent Valve.
8. Carefully turn the cylinder valve on the helium gas cylinder counter-clockwise for one quarter turn.
Ensure that the pressure reading on the gauge responds immediately. Turn the cylinder valve
further counter-clockwise to open the gas cylinder so that sufficient gas flow is present.
9. Carefully turn the cylinder valve on the argon gas cylinder counter-clockwise for one quarter turn.
Ensure that the pressure reading on the gauge responds immediately. Turn the cylinder valve
further counter-clockwise to open the gas cylinder so that sufficient gas flow is present.
If no argon pressure is displayed on the
Gas Indicator
, ensure the Argon Shutoff Valve is OPEN.
10. Continue the cryoablation procedure at the next planned freeze or thaw phase.
4.5.2 Disconnecting a Helium Cylinder
If helium is connected, i-Thaw, FastThaw and Cautery functions are disabled. To use i-Thaw,
FastThaw, and Cautery functions, helium must be disconnected and the lines cleared of helium.
1. Close both the argon and helium cylinder valves.
2. Open the Manual Vent Valve to discharge gas from the system and the high pressure gas supply
lines. Wait until all the pressure is released and both pressure gauges on the Navigation Tool Bar
indicate zero pressure.
3. Close the Manual Vent Valve.
4. Slowly open the argon cylinder valve one quarter to one half of a turn. Allow pressure to build on
the argon pressure gauge. Open the argon cylinder valve fully for sufficient argon flow.