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Table 7. Working Gas Pressures
Gas
Nominal Working Pressure
Argon
3500 psi
241 bar
24�1 MPa
Helium
2200 psi
152 bar
15�2 MPa
NOTE: When helium is not connected, active thawing can be conducted with an i-Thaw Function capable
cryoablation needle� The system will flow argon gas at 500 psi (34 bar, 3�4 MPa) through the needle and will
energize the internal heating element of the i-Thaw Function capable needle when the Thaw button is pressed�
CAUTION:
• When the gas cylinder pressure falls below the lower working pressure limit, the system displays an alert
message in the Navigation Tool Bar� To ensure optimal performance, replace a gas cylinder if the pressure falls
below the lower working pressure limit�
• Failure to operate the Visual-ICE Cryoablation System within the working pressure limits may affect the
cryoablation procedure�
•
If the system produces a continuous hissing sound, verify that the Manual Vent Valve is fully closed� If the
Manual Vent Valve is fully closed and the hissing sounds persists, shut OFF the system using the power control
knob located on the front of the system (Figure 1)� Close the gas supplies using the cylinder valves� Contact
Boston Scientific Technical Assistance Center�
Gas Line Flushing
After argon is connected and the gas lines pressurized, the Visual-ICE Cryoablation System automatically conducts
gas line flushing to reduce potential gas line contaminants�
• When argon is connected to the system and the gas lines pressurized prior to pressing Start Procedure, the
automated flushing will occur before the Procedure Screen is displayed�
• When the Procedure Screen is displayed before the argon is connected, automated flushing will occur after the
connected gas pressurizes the lines�
During the flushing procedure, a sequence of gas flow, followed by an idle period, will occur three times�
• Gas will flow for 3 seconds�
• An idle period of 30 seconds will follow the gas flow�
• The automated flushing process will be completed in ~ 90 seconds�
As the system conducts gas line flushing, the screen displays Optimizing Lines�
Screen 10. Optimizing Lines message
Working Pressure Limits
3200 psi to 3800 psi
221 bar to 262 bar
22�1 MPa to 26�2 MPa
1800 psi to 2500 psi
124 bar to 172 bar
12�4 MPa to 17�2 MPa
33
Black (K) ∆E ≤5.0
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