Fukuda Denshi ST-95
Fukuda Denshi · Model ST-95
Spiroanalyzer The ST-95 SPIROANALYZER, belonging to Fukuda Sangyo’s family of Spirometer products, is a pulmonary function testing instrument intended for performing patho-physiological breathing tests to evaluate Human respiratory functionality. The instrument is used by general physicians; respiratory practitioners; or, qualified personnel in medical hospitals, medical centers, clinics, or near the patient during domiciliary visit. The instrument carries out measurements of a patient’s pulmonary Vital Capacity (VC), Forced Vital Capacity (FVC), and, Maximum Voluntary Ventilation (MVV) by capturing instantaneous air flow data at discreet intervals of time while the patient does a prescribed breathing maneuver. The flow data pattern being displayed graphically on a LCD screen display. Its capability also extends to the storage and analysis per patient for three (3) series of VC and FVC data respectively; and, two (2) series of MVV data that maybe displayed in tabulated data-form on the same LCD screen. The acquired and analyzed data may then be compared against various spirometric indices as determined from user-selectable predicted equations. The instrument has likewise the ability to do comparative analysis required in Pre-post Medication and Bronchial Challenge Testing Regimens and a summary generation of hard-copy reports for all the tests in a manner useful for clinical analysis. The device has multiple patient-data storage of up to fifty (50) patients' that can be selectively stored into its built-in memory. With selected measurement results, data and their corresponding waveforms may be electronically uploaded via the RS-232 port to a waiting Personal Computer (PC). Data Management Software, FS/PC-95, for the PC is available at an option. Conventional fleish-type pneumotach flow sensor is provided as a standard accessory and an optional disposal flow sensor may be used at your requisite. Contraindication in the use of this instrument lies solely in the skill of the clinical technician to exact and be able to recognize a good patient effort and cooperation for optimal measurement results. The multiple- testing function of the instrument thus insures that a “maximum training effect” is achieved by the patient for measurement accuracy.
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.
Noisy ECG / lead-off during the test
HighSymptoms: Baseline wander, muscle noise, "lead off", ST measurements unreliable.
Root cause: Poor skin prep, dried or lifting electrodes, or a worn patient cable / lead set.
Treadmill speed or grade error
MediumSymptoms: Belt speed or incline does not match the protocol, error on the ECG unit.
Root cause: Grade motor / potentiometer, drive controller, or a speed-feedback fault.
Communication loss between treadmill and ECG unit
MediumSymptoms: ECG unit cannot control the treadmill, protocol will not advance.
Root cause: Control cable or interface fault.
Recorder / printer fault
LowSymptoms: No or faint report, paper jam.
Root cause: Thermal print head or paper handling.
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.
Patient cable / 10-lead set
Class Frequent wear itemRel. cost $$R&R Easy
Walking belt and deck
Class Periodic replacementRel. cost $$R&R Moderate
Grade motor / potentiometer
Class Major service partRel. cost $$R&R Moderate
Treadmill-to-ECG control cable
Class Periodic replacementRel. cost $$R&R Fairly easy
Thermal print head / paper
Class Periodic replacementRel. cost $R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Patient cable / 10-lead set | Frequent wear item | $$ | Easy |
| Walking belt and deck | Periodic replacement | $$ | Moderate |
| Grade motor / potentiometer | Major service part | $$ | Moderate |
| Treadmill-to-ECG control cable | Periodic replacement | $$ | Fairly easy |
| Thermal print head / paper | Periodic replacement | $ | Fairly easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
Error Codes
Extracted directly from this unit's own service manual.
1 BACK UP RAM NGThe memory device of the instrument may be defective.
Turn off then turn on the power switch to reset. If the same message is displayed, contact your Fukuda Sangyo dealer.
2 Extrapolated Volume NGVext value exceeds the standard value of 10% under FVC or 0.1 liter, whichever is greater.
Depress the ENT key to display the actual measurement result. Coach the patient to exhale forcefully as soon the maximum inspired level is reached.
3 ID DATA FULLThe memory capacity is full and unable to further store data.
Depress the ENT key to return to the ID screen. Delete unnecessary data and retry the data storage procedure.
4 NO DATANo data is stored in the memory.
Depress the ENT key to return to the ID screen.
5 DATA OUTPUT NGError in transmission of measurement data encountered.
Depress the ENT key to return ID screen. Check interconnection with the host computer and retry data transmission.
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: Noisy ECG
- Re-prep the skin and fit fresh electrodes.
- Secure the lead wires and use a patient cable strain relief / pouch.
- Swap in a known-good lead set.
- Check for EMI from the treadmill motor and grounding.
- Confirm a clean 12-lead at rest before starting the protocol.
Symptom: Speed or grade wrong
- Verify belt speed with a tachometer against the protocol.
- Check the grade motor and potentiometer range and calibration.
- Inspect the treadmill-to-ECG control cable.
- Calibrate grade per the service manual.
- Re-verify speed and grade, then centre and tension the belt.
Documents & Manuals
Safety & Recalls
Synced live from the FDA openFDA API.
- RECALL
For the Fukuda Denshi patient monitor model DS-8100, in less than 0.003% (17) of the 6227 devices sold worldwide, a Short-term Battery Error message has appeared and has been traced back to a bad (damaged) Lithium-Ion capacitor (Short-term battery backup).
- RECALL
A possible malfunction where a Short-term Battery Error message has appeared and has been traced back to a bad (damaged) Lithium-Ion capacitor (Short-term Backup battery).
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