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18
Off
Water does not flow through the CPG circuit.
Water is circulated directly from the MCH cold water tank through the CPG circuit
by a secondary water pump. The temperature of the water in the CPG circuit is
determined by the temperature of the water in the cold water tank. This mode is
Cold
designed to deliver cold cardioplegia, and may be used as a cold water source for
the
Quest
primary water pump is not running), this button will blink.
The CPG circuit is connected to the Main circuit, and the secondary water pump is
off. Water is circulated through the CPG circuit at the same temperature as the
Main circuit. This mode is useful for delivering a "warm shot" at the end of a
procedure, or for connecting a patient blanket. Switching from "Cold" to "Main"
Main
may cause a short-term temperature fluctuation in the Main circuit, due to the
introduction of cold water from the CPG circuit. In order to reduce this fluctuation,
the MCH will automatically pre-heat the internal heaters for approximately ten
seconds before making the switch. To further minimize the fluctuation, reduce the
overall length of the CPG circuit tubing as much as possible.
Alarms
The MCH incorporates various alarms, enabling auditory monitoring of the system and alerting
the operator to any conditions that require the operator's attention. A low priority alarm alerts the
operator to a condition that requires attention but poses minimal risk to the patient. A medium
priority alarm requires prompt operator attention to avoid potential reversible injury to the
patient. A high priority alarm indicates an immediate patient safety issue.
Low Water Level (medium priority)
If the water level in the MCH cold water tank falls below a safe operating
level, the MCH halts its operation, the Low Water Level screen appears, and
the alarm sounds a three-beep sequence every 8 seconds. To silence the Low
Water Level alarm, add water to the tank to a depth of at least 6 in (15 mm) or
turn off the mains power switch on the front of the MCH. The audible alarm
may be silenced for 60 seconds by touching the Audio Silence button at the
!
bottom left corner of the screen.
CardioQuip Modular Cooler-Heater Operator/Service Manual
The CPG Module controls are only visible if the Cardioplegia
Shared Channel (CSC) Module is installed, and offer the
following operational modes:
MPS™. If the MCH is delivering cold water in STANDBY mode (so the
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