St. Jude Medical, Inc. Unify CRT-D
ST. JUDE MEDICAL, INC. · Model Unify CRT-D
DF4 connector is designed to simplify implants by streamlining defibrillation connections into a single terminal pin and reducing the number of set screws Decreased device footprint and volume with the most narrow (40 mm) design available for greater patient comfort and range of motion during activity BiVCap®, LVCap™, RVCap® and ACap® Confirm features promote patient safety by automatically ensuring capture of the myocardium in response to pacing stimuli in the left ventricle, right ventricle and right atrium Triggered Pacing with BiV Trigger Mode helps maintain a high percentage of BiV pacing by triggering pacing in both the left and right ventricles in response to a sensed ventricular event Negative AV hysteresis with search promotes ventricular pacing by automatically reducing the AV delay when intrinsic activity is present, thereby promoting a high degree of ventricular pacing QuickOpt® timing cycle optimization provides quick and effective optimization for more patients at the push of a button The low frequency attenuation filter is designed to enhance sensing performance and may reduce the possibility of over sensing T waves Unique AF Suppression™ algorithm is clinically proven to suppress episodes of paroxysmal and persistent AF. Studies show a 25% decrease in symptomatic AF burden DeFT Response® technology tools provide more clinically proven, noninvasive options for managing high DFTs
Key tips
- ·Never skip the daily/shift ready-check - a defibrillator found dead during a code is a real, repeated root-cause finding.
- ·Pads and batteries have real expiration dates - check them on every PM, not just at annual service.
- ·Verify energy-delivery accuracy with a real defibrillator analyzer, not just a self-test pass.
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.
High-voltage capacitor failure
HighSymptoms: Charge fails or sluggish, low-energy delivery.
Root cause: Capacitor aging / leakage.
Battery degradation
HighSymptoms: Short charge-hold, low-battery on readiness test.
Root cause: Aged battery pack.
Charge / discharge relay fault
HighSymptoms: Won't charge or discharges unexpectedly.
Root cause: Relay/contactor wear.
SELV / patient isolation fault
MediumSymptoms: Leakage alarm, self-test fail.
Root cause: Failed isolation components.
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.
HV energy storage capacitor
Class Major service partRel. cost $$$$R&R Expert-level
Defibrillation electrodes / pads
Expiration-dated consumable.
Class ConsumableRel. cost $$R&R Easy
Charge relay / contactor
Class Periodic replacementRel. cost $$$R&R Difficult
Patient interface cable
Class Periodic replacementRel. cost $$R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| HV energy storage capacitor | Major service part | $$$$ | Expert-level |
| Defibrillation electrodes / pads Expiration-dated consumable. | Consumable | $$ | Easy |
| Charge relay / contactor | Periodic replacement | $$$ | Difficult |
| Patient interface cable | Periodic replacement | $$ | 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.
- ·Daily/shift visual and self-test check (AAMI EQ56 daily-ready standard)
- ·Battery and pad expiration-date tracking
- ·Energy-delivery accuracy test against a defibrillator analyzer
- ·Paddle/cable continuity check
- ·Annual full PM
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: High-voltage capacitor failure
- Confirm the presentation - typically charge fails or sluggish, low-energy delivery - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: capacitor aging / leakage.
- 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 rechargeable battery pack 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: Battery degradation
- Confirm the presentation - typically short charge-hold, low-battery on readiness test - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: aged battery pack.
- 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 hV energy storage capacitor 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.
- Crash carts (every unit)
- Emergency Department
- ICU
- OR
- Code-blue response areas
Documents & Manuals
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