Natus SONARA/tek
Natus · Model SONARA/tek
• High Quality Doppler Signal • Customized Protocols and Reporting • Unilateral Monitoring Options • Single channel Emboli Detection with Variable Thresholds • Speciality Tests: VMR and BHI • Multi-button Advanced Remote Control • Multiple Languages Capability • Statistics and Trending Packages • M-mode and Multi-Depth Displays in Diagnostic and Monitoring Modes • DICOM Compatible TCD is a useful tool for the evaluation of numerous neurovascular conditions in adult and pediatric patients: • Diagnostic cerebrovascular and extracranial investigation • Extended-term unilateral cerebrovascular monitoring The systems may be used in vascular labs, operating rooms, intensive care units, emergency departments and physician offices for the following applications: • Detection of intracranial stenosis • Detection of vasospasm due to subarachnoid hemorrhage • Detection of arteriovenous malformations (AVMs) • Assessment of collateral pathways • Detection of embolic events • Detection of PFO (Patent Foramen Ovale) with bubble test • Track and establish trends of blood flow velocities • Help assess surgical techniques through immediate feedback of the results of interventional procedures • Breath Hold and Vasomotor Reactivity (VMR) tests
Key tips
- ·Electrode impedance drives data quality more than almost any other single factor - check it before assuming an amplifier fault.
- ·Pre-case verification of intraoperative monitoring equipment isn't optional - a mid-case failure has direct surgical-decision consequences.
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.
Electrode impedance high
MediumSymptoms: Noisy / flat channels, impedance alarm.
Root cause: Dry gel, poor contact.
Amplifier channel fault
MediumSymptoms: Dead channel, artifact.
Root cause: Front-end amplifier failure.
Stimulator output fault
MediumSymptoms: No stimulus delivered.
Root cause: Stimulator circuit wear.
Grounding / isolation issue
LowSymptoms: 50/60 Hz interference.
Root cause: Shield/ground break.
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.
Stimulator cable
Class Periodic replacementRel. cost $$R&R Fairly easy
EEG electrode cap / cup
Frequent R&R.
Class Periodic replacementRel. cost $$R&R Easy
Patient electrode gel
Consumable.
Class ConsumableRel. cost $R&R Easy
Amplifier channel module
Class Periodic replacementRel. cost $$$R&R Difficult
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Stimulator cable | Periodic replacement | $$ | Fairly easy |
| EEG electrode cap / cup Frequent R&R. | Periodic replacement | $$ | Easy |
| Patient electrode gel Consumable. | Consumable | $ | Easy |
| Amplifier channel module | Periodic replacement | $$$ | Difficult |
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.
- ·Electrode / lead impedance check
- ·Amplifier calibration
- ·Annual electrical safety test
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Electrode impedance high
- Confirm the presentation - typically noisy / flat channels, impedance alarm - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: dry gel, poor contact.
- 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 eEG electrode cap / cup 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: Amplifier channel fault
- Confirm the presentation - typically dead channel, artifact - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: front-end amplifier failure.
- 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 patient electrode gel 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.
- Neurology / EEG lab
- ICU (continuous EEG monitoring)
- Operating Room (intraoperative monitoring)
Documents & Manuals
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