Laser Ablation Energy Calibration for Real-Time Output Stability

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Solution Overview

Problem

Lasers suffer from instability due to stabilization time, sensitivity to temperature changes, and component aging, leading to fluctuations in energy emission that can cause undesirable power distribution and potential tissue damage during medical procedures.

Innovation Solution

A system and method for dynamically controlling laser energy output in real-time using sensors to stabilize the laser, account for temperature changes, and compensate for component degradation, allowing for faster stabilization and reduced fluctuations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the laser is operated immediately after turn-on, then the treatment time is reduced, but the laser energy output is unstable and fluctuates significantly

Engineering Contradiction:

Improvestabilization timeVSAvoidlaser energy stability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The system performs preliminary characterization of the laser medium's temperature-dependent properties before actual treatment. Temperature coefficients are measured and stored in advance, allowing the control algorithm to pre-compensate for expected temperature drift during operation, enabling immediate use without stabilization delay

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A feedback control system continuously monitors laser output energy and adjusts pump power in real-time based on measured deviations from target energy levels. This closed-loop control compensates for temperature-induced fluctuations dynamically during operation

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the laser operates in varying temperature environments, then the laser can be used in different clinical settings, but the laser energy output changes due to temperature sensitivity

Engineering Contradiction:

Improveenvironmental adaptabilityVSAvoidlaser energy consistency

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system characterizes and compensates for temperature-dependent parameter changes in the laser medium. By measuring how key parameters (energy output, efficiency) vary with temperature and storing these relationships, the control algorithm can adjust pump power to maintain consistent laser output across different environmental conditions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Temperature sensors monitor the laser medium temperature in real-time, and this feedback is used by the control algorithm to dynamically adjust pump power settings, compensating for temperature-induced variations and maintaining reliable energy output across different clinical environments

Inventive Principle:

Principle #23Feedback

3Speed

If high pump power is applied during laser startup, then the laser reaches target energy faster, but the initial pulses have excessively high energy that can damage tissue

Engineering Contradiction:

Improvestabilization speedVSAvoidtissue damage risk

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The pump power is applied dynamically with a time-varying profile rather than constant high power. The system uses a ramped or stepped power increase that adapts to the laser medium's thermal time constant, enabling fast stabilization while keeping initial pulses at safe energy levels

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system performs preliminary thermal characterization of the laser medium to determine the optimal pump power ramp profile. This pre-acquired thermal data is used to design a startup sequence that quickly brings the laser to operating temperature without exceeding safe pulse energy thresholds

Inventive Principle:

Principle #10Preliminary action

4Reliability

If conventional stabilization procedures are followed, then the laser energy is stable, but the treatment efficiency is reduced due to long stabilization time

Engineering Contradiction:

Improveenergy stabilityVSAvoidtreatment efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Real-time feedback monitoring of laser output energy enables immediate detection of stabilization completion. The system continuously compares measured energy against target values and maintains active compensation until stability criteria are met, then transitions to normal operation, maximizing treatment efficiency while ensuring stability

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The laser system performs self-characterization and self-calibration during initial operation. By automatically measuring its own temperature coefficients and optimizing control parameters without external intervention, the system achieves rapid stabilization and eliminates manual setup time

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250359933A1Dynamic laser stabilization and calibration system

Publication Date: 2025.11.27 EXIMO MEDICAL

AI summary

Described is a laser ablation system arranged to dynamically adjust power output to provide increased stability and reduced fluctuations of emitted energy. Additionally described are a test catheter and calibration procedure for calibrating the laser ablation system for to dynamically adjust power output during an ablation procedure.