Corneal Laser Incision Planning Around Bowman's Membrane
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Solution Overview
Problem
Existing ophthalmological laser treatments for corneal opacities and scars often impair the Bowman's membrane and epithelium, leading to vision disturbances, especially when misalignment occurs during treatment.
Innovation Solution
The method generates control data to guide laser pulses based on the Bowman's membrane and epithelial layer course, ensuring a preset geometric relation and curvature to prevent injury, using pulsed laser pulses with specific wavelengths and durations for precise incision and photodisruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laser treatment methods are used to remove corneal opacities and scars, then vision improvement is achieved, but the Bowman's membrane and epithelium are impaired or injured
Solution Approach 1:
The control data is generated in advance with pre-calculated incision courses that are specifically designed to maintain a preset geometric relation to the Bowman's membrane. This preliminary planning ensures that the laser incisions are positioned safely away from the membrane before treatment begins, preventing injury while achieving vision improvement.
Solution Approach 2:
The system uses patient-specific anatomical information about the Bowman's membrane course to dynamically adjust and optimize the incision path. By incorporating feedback from pre-acquired anatomical data, the control algorithm can adapt the laser path in real-time to avoid the membrane while maintaining effective treatment of corneal opacities.
2Productivity
If the laser incision path is set close to the Bowman's membrane for effective treatment, then treatment efficacy is improved, but misalignment during treatment causes membrane injury
Solution Approach 1:
The control data generation incorporates a safety margin by presetting the incision course at a calculated distance from the Bowman's membrane. This preliminary positioning creates a buffer zone that accommodates potential misalignment during treatment, allowing the laser to remain effective while preventing membrane injury even if positioning drifts slightly.
Solution Approach 2:
The system builds in a protective cushion or safety margin by designing the incision path to maintain a preset geometric relation to the Bowman's membrane. This cushioning effect provides a buffer against positioning errors and misalignment during treatment, protecting the membrane from injury while preserving treatment efficacy.
3Productivity
If the incision course is generated without considering Bowman's membrane course, then treatment speed is maintained, but the membrane is injured
Solution Approach 1:
The control data generation process incorporates Bowman's membrane course information in advance, calculating the optimal incision path that maintains a preset geometric relation to the membrane before treatment begins. This preliminary integration of anatomical data allows the treatment to proceed at full speed without requiring real-time adjustments, preventing membrane injury while maintaining treatment efficiency.
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 allows for precise incision without damaging the Bowman's membrane or epithelium, improving treatment efficacy by considering patient-specific anatomical features and reducing the risk of injury during misalignment.
Implementation Method 1
Control data for controlling the laser is generated by means of the control device such that it emits pulsed laser pulses to the eye for performing a photoablation
Implementation Method 2
emits pulsed laser pulses to the eye for performing a photoablation and/or for performing a photodisruption
Data Source
AI summary
The invention relates to a method for providing control data for an ophthalmological laser (12) of a treatment apparatus (10) as well as to an surgical procedure, wherein the method comprises the following steps performed by at least one control device (18): Presetting a course of a Bowman's membrane (34) of a cornea of an eye (14) of a patient depending on at least one patient information; determining an incision course at least for an anterior interface (20) of a volume body (16) to be removed in a stroma (36) of the eye (14) depending on the course of the Bowman's membrane (34) such that a preset geometric relation to the Bowman's membrane (34) is formed by the anterior interface (20); and generating the control data for controlling the laser (12) by means of the control device (18) such that it emits pulsed laser pulses in a shot sequence onto the eye. Further, the invention relates to a control device (18), to a treatment apparatus (10), to a computer program as well as to a computer-readable medium.