Laser Pulse Spacing Control for Precise Corneal Tissue Separation
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Solution Overview
Problem
Current laser processing techniques for corneal tissue require high energy input, which can lead to local tissue defects and opaque bubble layers due to uniform pulse distances along incision paths, necessitating a reduction in introduced energy for precise and efficient tissue separation.
Innovation Solution
A method for generating control data that optimizes incision paths by adjusting pulse distances and row distances between laser pulses, allowing for non-uniform distributions that minimize local energy density and prevent defects, using a control device to output laser pulses along a processing area with varying pulse distances and row distances, and optimizing energy input to achieve efficient tissue separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform pulse distances are used along incision paths, then symmetric patterns are formed, but high energy input leads to local tissue defects and opaque bubble layers
Solution Approach 1:
The patent applies asymmetry by varying pulse distances and row distances to create asymmetric patterns instead of uniform symmetric patterns. This allows different spacing in different directions, optimizing energy distribution to prevent local overheating and tissue defects while maintaining effective tissue separation.
Solution Approach 2:
The patent implements local quality by adapting pulse and row distances to local requirements within the processing area. Different regions receive customized pulse patterns based on their specific needs, allowing precise control of energy input to prevent defects in sensitive areas while maintaining efficiency in other regions.
2Reliability
If high energy input is used for laser processing, then optical breakdown is achieved, but tissue defects and opaque bubble layers occur
Solution Approach 1:
The patent applies dynamics by making pulse distances and row distances variable rather than fixed. The spacing parameters are dynamically adjusted based on position and local conditions, allowing the system to maintain reliable optical breakdown while adapting energy input to prevent excessive heating and tissue damage.
Solution Approach 2:
The patent implements parameter changes by varying pulse energy, pulse distance, and row distance as controllable parameters. This allows optimization of the balance between achieving sufficient optical breakdown and preventing harmful effects by adjusting multiple parameters simultaneously rather than using fixed high energy input.
3Stability of the object's composition
If symmetric patterns with identical pulse distances are used, then uniform energy distribution is achieved, but local energy density becomes too high causing defects
Solution Approach 1:
The patent resolves this contradiction by introducing asymmetry in pulse and row distances. Instead of uniform symmetric patterns, asymmetric spacing is used to redistribute energy more evenly across the processing area, preventing local energy hotspots that cause defects while maintaining overall uniformity in energy delivery.
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
The optimized incision path approach reduces energy input, minimizing local energy density and preventing tissue defects, ensuring precise and efficient separation of corneal tissue while maintaining effective plasma formation for processing.
Implementation Method 1
The optical breakdown describes a strong local ionization of the corneal tissue, wherein a critical plasma density is exceeded. The optical breakdown can be initiated in the corneal tissue in laser-induced manner in that a power density threshold is exceeded by the laser pulse within the corneal tissue.
Implementation Method 2
Due to the temperature increase of the plasma, a Coulomb expansion of the plasma occurs, whereby a cavitation bubble arises in the corneal tissue, in which the corneal tissue is severed.
Implementation Method 3
The photodisruption is based on a local mechanical decomposition of the corneal tissue, which is caused by a shock wave arising in the optical breakdown.
Implementation Method 4
The photodisruption is based on a local mechanical decomposition of the corneal tissue, which is caused by a shock wave arising in the optical breakdown.
Data Source
AI summary
A method for providing control data for a laser of a processing apparatus, wherein the method includes the following steps performed by at least one control device: outputting control data to a processing apparatus, wherein the control data effect that laser pulses are sequentially output onto positions of impingement into a processing area to be processed along an incision path by the laser of the processing apparatus. The method further includes following steps: ascertaining an effective diameter of a local effective area generated by the respective laser pulse, in the respective position of impingement, ascertaining a unit area to be formed by a pulse distance and a row distance depending on the effective diameter and an energy dose to be provided in the processing area, ascertaining the pulse distance and row distance according to a preset ascertaining method, generating the control data for controlling the processing apparatus.