The dual-color LED indicator system performs two critical roles: enhancing visual clarity and confirming operational safety. The first LED provides continuous general illumination to light up the target area, ensuring the physician can clearly observe the treatment site. The second LED serves as a conditional status light, activating only when the electrical probes detect proper skin contact to signal that the laser is ready to fire.
This system functions as a real-time feedback loop, preventing the physician from activating the laser until both visual targeting and physical skin contact are securely established.
The Mechanics of the Dual-Indicator System
Role 1: Visual Assistance
The first component of the system is a general illumination LED. Its primary function is to light up the specific area of the skin currently being treated.
This ensures the physician maintains a clear view of the tissue reaction and positioning. It eliminates shadows created by the handpiece itself, allowing for precise placement of the device.
Role 2: Safety Confirmation
The second component is a status LED of a different color. Unlike the general light, this indicator is not always on.
It is directly linked to the handpiece's electrical probes. It remains inactive while the handpiece is in the air or positioned incorrectly.
Triggering the "Ready" State
This second LED activates only when the probes confirm proper skin contact.
This serves as a visual "go" signal. It confirms that the electrical connection is complete and the system is technically ready for laser output.
Why This Feedback Loop Matters
Ensuring Accurate Timing
The system removes guesswork regarding when to activate the laser.
By linking the light to physical contact sensors, the device ensures the laser output occurs only when the handpiece is stabilized against the skin. This synchronization is vital for consistent energy delivery.
Preventing Accidental Discharge
The distinct color difference provides an immediate cognitive cue to the operator.
If the second light is not illuminated, the physician knows instantly that the device is not safe to fire. This prevents accidental discharges into the air or poor coupling with the tissue.
Understanding the Limitations
Sensor Dependency
The safety light relies entirely on the electrical probes making good contact.
If the probes are dirty or the skin is extremely dry, the sensor may fail to register contact even if the handpiece is positioned correctly. This requires the operator to maintain the device sensors diligently.
Visual Reliance
There is a risk of over-reliance on the light indicator.
Operators must not ignore tactile feedback or patient positioning. The light is a confirmation tool, not a replacement for proper clinical technique and hand stability.
Making the Right Choice for Your Goal
To maximize the utility of this feature, you should adapt your workflow based on the specific phase of treatment:
- If your primary focus is Precision: Use the general illumination LED to continuously inspect the skin texture and reaction before and after every pulse.
- If your primary focus is Safety: Train your eyes to look for the secondary color activation as the final "permission" step before pressing the trigger.
By treating these lights as distinct data points—one for vision, one for status—you ensure every pulse is both accurate and safe.
Summary Table:
| Feature Component | Primary Function | Indicator Status | Operational Benefit |
|---|---|---|---|
| General Illumination LED | Visual Assistance | Always ON during operation | Enhances clarity and tissue visibility |
| Status Confirmation LED | Safety Confirmation | Activates upon skin contact | Prevents accidental discharge & ensures coupling |
| Electrical Probes | Contact Sensing | Triggers Status LED | Synchronizes energy delivery with contact |
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References
- John R. Tyrer. Optical radiation and infection control for laser hand pieces. DOI: 10.2351/1.5056843
This article is also based on technical information from Belislaser Knowledge Base .
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