Laser Eye Treatment Device Corneal Cut Surface Generation
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Solution Overview
Problem
Current refractive surgery methods, such as LASIK, face challenges in efficiently generating cut surfaces in the cornea using pulsed laser radiation, particularly when creating complex three-dimensional cut surfaces, which requires high pulse frequencies and increased control efforts, leading to longer operation times and higher computational burdens.
Innovation Solution
A treatment device and method that adjust focused laser radiation along a path with target points spaced apart, emitting pulses between these points, allowing for continuous beam deflection and reducing the need for precise focus adjustment between each pulse, thereby simplifying control and increasing the speed of cut surface generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pulse frequency is used to generate cut surfaces quickly, then productivity is improved, but device complexity and control effort increase
Solution Approach 1:
The patent divides the continuous laser beam path into discrete segments defined by target points. Instead of controlling the laser focus continuously at high frequency, the system segments the path into manageable target points that can be controlled at lower frequencies, reducing the control burden while maintaining cutting efficiency.
Solution Approach 2:
The patent pre-calculates and stores the complete path as a sequence of target points before the laser operation begins. This preliminary preparation of control data allows the laser system to operate at high pulse frequencies without requiring real-time control calculations, thereby reducing device complexity and control effort during actual operation.
2Productivity
If high pulse frequency is used to generate cut surfaces quickly, then productivity is improved, but loss of time for control processing increases
Solution Approach 1:
The control data representing the complete laser path is pre-calculated and stored as a sequence of target points before the laser operation. This preliminary action transfers the computational burden to the preparation phase, allowing the laser to run at high pulse frequencies during operation without real-time control processing delays.
Solution Approach 2:
The patent creates a digital copy of the desired cut surface path in the form of target point coordinates. This copy serves as a reference that guides the laser operation without requiring continuous computational processing, enabling high-speed operation with minimal control processing time.
3Manufacturing precision
If complex three-dimensional cut surfaces are created, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
Complex three-dimensional cut surfaces are segmented into sequences of target points that can be processed efficiently. This segmentation allows the laser to follow complex paths with high precision while maintaining high pulse frequencies, resolving the contradiction between manufacturing precision and productivity.
Solution Approach 2:
The patent employs dynamic focus adjustment between target points, allowing the laser to adapt its focus position continuously along the path while operating at high pulse frequencies. This dynamic approach enables precise three-dimensional cutting without sacrificing speed, as the system can rapidly adjust focus between predetermined target points.
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 significantly reduces the complexity and time required for generating cut surfaces, allowing for faster and more efficient creation of three-dimensional cut surfaces with reduced computational and transmission efforts, enabling quicker surgical corrections of ametropia.
Implementation Method 1
If the power density of the radiation during a pulse is above a threshold value, an optical breakthrough occurs, which creates a plasma bubble in the cornea
Implementation Method 2
The pulsed laser radiation is used for tissue separation, with the pulse length usually being less than 1 ps
Implementation Method 3
an optical breakthrough occurs, which creates a plasma bubble in the cornea
Data Source
Figure 1~6
Figure 1a
Figure 3~7
AI summary
The invention relates to a treatment device for operatively correcting defective vision of an eye (3) of a patient (4). Said treatment device comprises a laser device (L) that separates the cornea tissue by applying pulsed laser radiation (2). The laser radiation (2) is focused on target points (28) arranged in a pattern in the cornea (5). Said Laser device (L) displaces the focused laser radiation (2) along a path (24) on the target points (28) of the pattern, and emits pulses of the pulsed laser radiation (2) into the cornea (5), also on the points (6) situated on the path (24) between the target points (28).