Eye Surgical Laser Lenticule Compensation for Corneal Deformation
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Solution Overview
Problem
Existing eye surgical lasers face challenges in accurately separating a lenticule from the cornea due to deformation caused by contact elements, leading to deviations in the achieved refractive power and lenticule height, resulting in excessive tissue removal.
Innovation Solution
A method and apparatus that utilize a control device to ascertain a lenticule geometry and deformation geometry, using correction values to compensate for deformation caused by contact elements, ensuring precise lenticule separation by adjusting the control data for the eye surgical laser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid contact element is used to fix the eye during treatment, then the eye stability is improved, but the cornea deformation increases leading to lenticule geometry deviation
Solution Approach 1:
The system performs preliminary measurements of the cornea before treatment, detects the deformation caused by the contact element, and pre-calculates compensation values that are integrated into the treatment plan before the actual lenticule separation occurs
Solution Approach 2:
The system measures the actual corneal deformation during or after treatment, compares it with the planned geometry, and uses this feedback information to adjust and optimize subsequent treatments, achieving progressively better precision
2Reliability
If the refractive power value is manually adapted to compensate for contact element deformation, then the achieved refractive power matches the correction goal, but the lenticule height deviates from the planned height resulting in excessive tissue removal
Solution Approach 1:
The system changes multiple geometric parameters simultaneously (lenticule height, diameter, depth) based on measured corneal deformation characteristics, rather than manually adjusting only the refractive power value, thereby achieving both refractive accuracy and correct tissue removal volume
Solution Approach 2:
The system replaces manual empirical adjustment with an automated computerized calculation system that uses measured deformation data to precisely determine the compensated lenticule geometry, eliminating the trial-and-error approach and excessive tissue removal
3Ease of manufacture
If the lenticule geometry is calculated based on predetermined visual disorder data, then the treatment planning is simplified, but the achieved lenticule height deviates from the planned height due to unaccounted contact element deformation
Solution Approach 1:
The system performs preliminary measurements of the cornea and calculates deformation compensation values before finalizing the treatment plan, so that the simplified planning process automatically incorporates accurate deformation compensation without requiring complex manual adjustments
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 optimizes the lenticule separation process, minimizing tissue removal and improving treatment accuracy by compensating for deformation effects, thereby enhancing treatment results.
Implementation Method 1
a pulsed laser and a beam focusing device can for example be formed such that laser beam pulses effect a photodisruption in a focus located within the organic material to separate a lenticule from the cornea
Data Source
AI summary
A method for providing control data of an eye surgical laser is disclosed. A control device ascertains a lenticule geometry of the lenticule to be separated from predetermined visual disorder data of a human or animal eye. The lenticule geometry is defined by means of a refractive power value to be corrected and a lenticule diameter. The control device ascertains a correction value for compensating for a deformation of the lenticule, which is generated by at least one contact element of the treatment apparatus. The control device ascertains a deformation geometry of the lenticule, wherein the deformation geometry is defined by means of the refractive power value and a deformation diameter. The deformation diameter is calculated depending on the lenticule diameter and the correction value, and provides control data for controlling the eye surgical laser, which uses the deformation geometry for the separation of the lenticule.