VBM Medical Tourniquet 4500
VBM Medical · Model Tourniquet 4500
Tourniquet Our compressed air tourniquets are connected to central air supply. The analog display features a precision manometer with an accurate display of the current cuff pressure. Our devices are also operational without central air supply because they automatically switch to manual operation in case of central air loss.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
Will not reach or hold set cuff pressure
HighSymptoms: Pressure droops during a case, will not inflate to setpoint, leak alarm.
Root cause: Internal pump / compressor wear, a solenoid-valve fault, or a leak in the tubing / cuff / connectors.
Pressure inaccuracy / calibration drift
HighSymptoms: Displayed pressure differs from an independent gauge - patient-safety critical.
Root cause: Pressure-transducer drift or a calibration fault.
Dual-channel / bilateral fault
MediumSymptoms: One channel will not regulate independently, cross-talk between channels.
Root cause: Channel solenoid / transducer or a manifold fault.
Alarm / timer fault
MediumSymptoms: Inflation-time alarm not sounding, timer wrong.
Root cause: Alarm / timer board fault - a safety function.
Tubing / connector / cuff fault
MediumSymptoms: Leak at the connector, cuff will not hold.
Root cause: Worn tubing, connectors, or a damaged cuff.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
Internal pump / compressor
Class Major service partRel. cost $$$R&R Difficult
Solenoid / regulator valve
Class Major service partRel. cost $$R&R Moderate
Pressure transducer
Verify against a calibrated gauge after replacement.
Class Periodic replacementRel. cost $$R&R Moderate
Connecting tubing / connectors
Class Frequent wear itemRel. cost $R&R Easy
Alarm / control board
Class Major service partRel. cost $$R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Internal pump / compressor | Major service part | $$$ | Difficult |
| Solenoid / regulator valve | Major service part | $$ | Moderate |
| Pressure transducer Verify against a calibrated gauge after replacement. | Periodic replacement | $$ | Moderate |
| Connecting tubing / connectors | Frequent wear item | $ | Easy |
| Alarm / control board | Major service part | $$ | Moderate |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Will not hold set pressure
- Fit known-good tubing and a known-good cuff.
- Occlude the outlet and confirm the pump holds pressure.
- Check the solenoid / regulator valve.
- Verify displayed pressure against a calibrated reference gauge across the range.
- Rebuild / replace the pump, valve or transducer as isolated.
Symptom: Pressure reads inaccurately
- Tee in a calibrated gauge and compare at several set pressures.
- Run the calibration procedure per the service manual.
- Confirm both channels on a dual unit.
- Confirm the inflation-time alarm sounds.
- Do not use the tourniquet clinically until pressure accuracy is confirmed.