GE Datex-Ohmeda Lot# 4901 Bellows Subassy Adult ABA W Disk Ring Bumpers 1500-3378-000 for Datex-Ohmeda 7100 Anaesthesia machine

► Brief Introduction

The Bellows assembly is the interface between drive gas and the patient circuit in the breathing system. The pressure relief valve (or pop-off valve) in the bellows assembly limits pressure in the patient circuit. Excess fresh gas is discharged through the exhalation valve into the gas scavenging system.
The Bellows Pressure Relief Valve (PRV) is normally closed, maintaining approximately 1.5 cm H2O in the breathing circuit in a no flow condition, enough to keep the bellows inflated. It is piloted closed during inspiration and remains closed until the bellows is refilled during exhalation. If the pressure in the patient circuit exceeds 4 cm H2O, the pop-off valve opens to exhaust excess fresh gas flow at a rate up to 4 L/min

► Inspiratory ValveCalibration

1. Remove the bellows and pressure relief valve (pop-off) from the bellows assembly.

• Remove the bellow housing.
• Remove the bellows and bellows mounting rim as an assembly.
• Remove the pressure relief valve.
• Replace the bellows housing.
• Note: If you have just completed the PEEP Valve Calibration, remove these parts from the bellows assembly and then reassemble the breathing system.

2. Attach a patient circuit tube to the Calibrated Flow Orifice test tool.

3. Connect the open end of the patient circuit tube to the inspiration flow patient connection.

4. Set the Bag/Vent switch to Vent.

5. Establish drive gas for the ventilator.

6. Adjust fresh gas flow so the actual Airway Pressure reads 1.05 cm H2

► Breathing circuit parameters

► Calibration setup
1. Remove the ABS breathing system from the machine.
2. Remove the Exhalation Valve.
3. Separate the Bellows Module from the Circuit Module.
4. Install the Circuit Module only.
5. Attach a patient circuit tube to the Calibrated Flow Orifice test tool.
6. Insert the Calibrated Flow Orifice into the manifold (PEEP) port.
7. Connect a pressure sensing tee to the inspiration flow patient connection.
8. Connect the open end of the patient circuit tube to the flow port of the pressure sensing tee.
9. Connect a manometer to the pressure sensing port of the tee connector.

► Quality Guarantee

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