Fresenius Kabi OPTIMA PT-VS-S, Technical Manual

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optima02_002b_en.fm 19
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2.2 Operational description
From an operational point of view, the Optima pump is made up of 3 sub-assemblies:
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a sub-assembly to maintain to check the correct positioning of the tube,
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a motorisation sub-assembly,
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an external connection sub-assembly.
2.2.1 Tube check and maintenance sub-assembly
The tube is positioned along the front part and held in place by the door.
The front part is equipped with four detection systems:
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a detector to check the closed /open position of the door,
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an ultra-sound detector to detect the presence of air bubbles in the tube.
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The pressure detection is ensured by two piezo-resistant sensors.
2.2.2 Pumping sub-assembly
The pumping sub-assembly contains the peristaltic pumping mechanism.
The mechanism is made up of a camshaft that creates a wave-like movement in a bank of 14
’fingers’. The displacement of these ’fingers’ is controlled by the CPU board, while turning it
displaces the liquid at the programmed flow rate.
The cam shaft is driven by a stepper-motor and a reduction gearbox assembly via a toothed
belt.
An optical disc attached to the end of the cam shaft controls its rotation.
2.2.3 External connection sub-assembly
The Optima contains two connectors located at the rear of the lower case:
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an RS 232 connector/Nurse call,
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a connector dedicated to the drip detector.