Fresenius PT, ST, VS
Fresenius · Model PT, ST, VS
• Flow rate range 1 to 1000 ml/h (1500ml/h Optima ST) in normal mode. 0.1 to 100 ml/h in micro-infusion mode • Flow rate accuracy ± 5% with recommended sets • Volume range 1 to 9999 ml in normal mode. 0.1 to 999.9 ml in micro-infusion mode • Infusion time adjustable from 1 minute to 96 hours • Setting modes flow rate only, flow rate + volume, volume/time, rate + time, ramp up/ramp down, primary/secondary, sequential, bolus, induction/loading dose, micro-infusion • Optima VS: OCS (Occlusivity Check System) • Optima PT/ST: Drop sensor • DPS (Dynamic Pressure System): detection of pressure variations in the line allowing both a faster occlusion detection or a line disconnection detection • Anti-bolus system: automatic bolus reduction at occlusion release • Pressure limit adjustable from 100 to 900 mmHg • RS232 bi-directional connection • Battery life: 5 h 30 in average at 125 ml/h
Key tips
- ·Free-flow protection must be verified on every PM - a failed anti-free-flow clamp is a direct overdose risk.
- ·Test occlusion alarms in both directions - failing to alarm when it should is more dangerous than a false alarm.
- ·Battery run-time complaints are the most common real-world nuisance call - a full charge/discharge cycle test catches most of them.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
Occlusion / downstream blockage
HighSymptoms: Occlusion alarm, no flow, upstream pressure high.
Root cause: Kinked set, clamped line, patient vein issue.
Free-flow (failure of anti-free-flow)
HighSymptoms: Uncontrolled flow when door open.
Root cause: Worn roller or failed free-flow valve.
Motor / drive failure
MediumSymptoms: Stalled infusion, inaccurate rate.
Root cause: Peristaltic motor or encoder wear.
Door / carriage sensor fault
LowSymptoms: Set not recognized, door-open error.
Root cause: Dirty or failed door microswitch.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
IV administration set
Consumable; per patient.
Class ConsumableRel. cost $R&R Easy
Peristaltic roller / pump mechanism
Common R&R on high-mileage pumps.
Class Periodic replacementRel. cost $$$R&R Difficult
Air detector / ultrasonic sensor
Class Periodic replacementRel. cost $$R&R Moderate
Door microswitch
Class Periodic replacementRel. cost $R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| IV administration set Consumable; per patient. | Consumable | $ | Easy |
| Peristaltic roller / pump mechanism Common R&R on high-mileage pumps. | Periodic replacement | $$$ | Difficult |
| Air detector / ultrasonic sensor | Periodic replacement | $$ | Moderate |
| Door microswitch | Periodic replacement | $ | Fairly easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Occlusion pressure and flow-rate accuracy verification
- ·Battery conditioning cycle
- ·Door latch and air-in-line sensor inspection
- ·Post-drop functional check before return to service
- ·Annual PM per manufacturer schedule
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Occlusion / downstream blockage
- Confirm the presentation - typically occlusion alarm, no flow, upstream pressure high - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: kinked set, clamped line, patient vein issue.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the iV administration set per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Air-in-line detection
- Confirm the presentation - typically air-in-line alarm, infusion paused - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: air in set, improperly primed tubing.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the peristaltic roller / pump mechanism per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Patient care floors
- ICU
- OR
- Oncology / infusion centers
- Home health (portable pumps)
Documents & Manuals
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