Coherent SELECTA 7000
Coherent · Model SELECTA 7000
SELECTA 7000 SLT LASER The Coherent Medical Lumenis Selecta 7000 is an SLT (Selective Laser Trabeculoplasty) system using a frequency-doubled, Q-switched Nd: YAG. It delivers single pulses of 0.1 to 2.0 millojoules per pulse with a pulse duration of approximately 3 nanoseconds. This low energy, short pulsed treatment confines thermal damage to cells containing the target pigment or chromophore. In the case of trabecular meshwork, this target is represented by the pigmented cells. The nanosecond pulse duration is also an important factor in preventing collateral and coagulative damage. The Selecta 7000 is specifically designed to perform selective laser trabeculoplasty (SLT), which incorporates a technique for the treatment of open angle glaucoma. SLT lowers intraocular pressure by using short pulses of an Nd: YAG laser to target melanin-containing cells in the trabecular meshwork, resulting in increased fluid outflow. The limitations of argon laser trabeculoplasty (ALT) are primarily related to its coagulative effect, which leads to scarring of the trabecular meshwork. SLT retains the therapeutic benefit of laser treatment - reduced intraocular pressure, without the collateral thermal damage to non-melanin containing cells and to the trabecular meshwork structure. The Coherent Selecta 7000 is the first FDA approved SLT laser to ever enter the market. It is stand alone and self-contained within its own slit lamp and table.
Key tips
- ·Verify laser output with a real power meter, not the unit's own display - the display can drift independently of true output.
- ·Take "the image looks a little off" reports seriously - optical alignment drift is usually gradual, not sudden.
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.
No or low laser output
HighSymptoms: Weak or no output at the delivery device, treatment ineffective, power not reaching the set value.
Root cause: Laser module / lamp / diode-bar ageing, a damaged delivery fibre / handpiece / applicator, or a driver / power-supply fault.
Cooling / thermal shutdown
HighSymptoms: Unit shuts down after a period, over-temperature or low-flow alarm.
Root cause: Chiller / TEC fault, low or contaminated coolant, a failed pump, or blocked airflow.
Delivery fibre / handpiece / applicator fault
MediumSymptoms: Burn marks at the tip, high loss, intermittent output, applicator not recognised.
Root cause: Damaged or contaminated fibre / applicator / connector.
Skin-cooling / contact-cooling fault (aesthetic)
MediumSymptoms: Skin cooling not delivered, cooling / cryogen alarm.
Root cause: Contact-cooling / cryogen supply, a valve, or the tip.
Footswitch / interlock / key fault
MediumSymptoms: Laser will not fire, key / interlock / footswitch error.
Root cause: Footswitch, door interlock, or key-switch fault.
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.
Laser module / lamp / diode bar
Power re-calibration required after replacement.
Class Periodic replacementRel. cost $$$$R&R Expert-level
Delivery fibre / handpiece / applicator
Class Frequent wear itemRel. cost $$$R&R Fairly easy
Chiller / TEC components & coolant filter
Class Periodic replacementRel. cost $$$R&R Difficult
Contact-cooling tip / cryogen valve (aesthetic)
Class Periodic replacementRel. cost $$R&R Moderate
Footswitch
Class Periodic replacementRel. cost $$R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Laser module / lamp / diode bar Power re-calibration required after replacement. | Periodic replacement | $$$$ | Expert-level |
| Delivery fibre / handpiece / applicator | Frequent wear item | $$$ | Fairly easy |
| Chiller / TEC components & coolant filter | Periodic replacement | $$$ | Difficult |
| Contact-cooling tip / cryogen valve (aesthetic) | Periodic replacement | $$ | Moderate |
| Footswitch | 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.
- ·Optical alignment / calibration check
- ·Lamp or laser output verification
- ·Annual full PM
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: No or low output
- Measure output at the delivery device with a laser power meter against the setting.
- Fit a known-good delivery fibre / handpiece / applicator.
- Confirm the cooling system runs and coolant is at level and clean.
- Check the key, interlock and footswitch are satisfied.
- Escalate a confirmed laser-module or driver fault to the OEM; recalibrate power after any module work.
Symptom: Thermal shutdown
- Confirm the cooling fans / pump run and airflow is clear.
- Check the coolant level and replace the coolant filter.
- Let the unit cool and restart.
- Clean the air filters / vents.
- Monitor for recurrence during a treatment.
Technical Specs
- Laser Type
- Nd:Yag
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Eye clinic / ophthalmology suite
- Operating Room (ophthalmic surgery)
Documents & Manuals
No documents available for this device yet.
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