Laser Safety Feedback Modulation for Signal Discrimination
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Solution Overview
Problem
Current systems face challenges in effectively distinguishing stimulated or reflected radiation feedback signals from background radiation during medical laser procedures, making it difficult to detect overheating or burning at the treatment site.
Innovation Solution
The solution involves encoding or modulating an aiming or reference beam to enhance the detectability of the feedback signal, which can be stimulated emission or reflection from phosphors at the treatment site, allowing for better discrimination from background radiation using detectors capable of wavelength, amplitude, timing, or frequency analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an aiming or reference beam is used to provide feedback signal from the treatment site, then information about treatment site conditions can be obtained, but the feedback signal is difficult to distinguish from background radiation
Solution Approach 1:
The patent applies periodic action by modulating the aiming or reference beam at a specific frequency (e.g., 100-1000 Hz) before it reaches the treatment site. This modulation creates a periodic feedback signal that can be easily distinguished from background radiation through frequency analysis. The modulated beam stimulates phosphors or reflects off instruments at the treatment site, and the returned modulated signal is detected and demodulated to extract treatment site information.
Solution Approach 2:
The patent changes the frequency parameter of the aiming or reference beam through modulation. By encoding the beam with a specific frequency signature, the system transforms an otherwise indistinguishable feedback signal into one that can be readily identified and measured. This parameter change allows detectors to filter and amplify the specific frequency range corresponding to the modulated beam, effectively separating it from background radiation.
2Measurement precision
If stimulated emission or reflected signals are used for feedback, then unique signatures can enhance detectability, but discrimination from pyrolytic or temperature-based emissions remains difficult
Solution Approach 1:
The modulation technique creates a time-varying signal with a distinct frequency that differs from the continuous or differently-frequencyed background radiation from heated tissues. The detector system uses this frequency difference to selectively amplify and process the modulated feedback signal while filtering out other radiation sources.
Solution Approach 2:
The patent introduces phosphors as an intermediary substance at the treatment site that absorbs the modulated aiming/reference beam and re-emits light at different wavelengths. This wavelength transformation creates an additional distinguishing feature between the feedback signal and background radiation, as the phosphor emission spectrum is distinct from the thermal radiation spectrum of heated tissues.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables more reliable detection of conditions at the treatment site, minimizing damage to equipment and patient by providing real-time feedback for controlling the laser, allowing for timely shutdown or adjustment of the therapeutic beam.
Implementation Method 1
an encoder or modulator to the safety feedback system
Implementation Method 2
stimulated emission or reflected signals having a discrete signature
Implementation Method 3
stimulated emission of phosphors provided in a target or instrument present at the treatment site
Implementation Method 4
The encoded or modulated feedback signal may be detected by any detector or spectrometer capable of discriminating between different wavelengths, amplitudes, timing, frequency spectra
Implementation Method 5
a laser apparatus for generating and supplying laser energy to a treatment site within a patient
Implementation Method 6
radiation emitted by the tissues as they are heated
Data Source
AI summary
A medical laser safety feedback apparatus and method enhances the detectability of a feedback signal from the treatment site by modulating or encoding an aiming or reference beam that is used to provide a stimulated emission or reflected component of the feedback signal.