Dual Focus Adjusting Devices for Ophthalmological Laser Depth Control
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Solution Overview
Problem
Existing ophthalmological laser treatment apparatuses face challenges in efficiently adjusting the focus point, particularly for asymmetric irradiation patterns, due to slow and limited adjustments in the depth direction, which complicates precise tissue removal or alteration in the cornea.
Innovation Solution
The use of two focus adjusting devices with different speed and stroke ranges allows for coarse and fine adjustments of the focus point, with one device providing a larger stroke at slower speeds and the other offering quicker, more precise adjustments, enabling improved handling of asymmetric patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single focus adjusting device is used, then the device complexity is reduced, but the adjustment speed and precision in depth direction are insufficient for asymmetric irradiation patterns
Solution Approach 1:
The single focus adjusting device is segmented into two independent devices: a first focus adjusting device for coarse depth adjustments and a second focus adjusting device for fine depth adjustments. This segmentation allows each device to be optimized for its specific function, with the first device providing large stroke movements and the second device providing high-precision positioning, thereby resolving the contradiction between adjustment speed and device complexity.
2Adaptability or versatility
If the first focus adjusting device is moved, then the coarse depth setting is achieved, but the second focus adjusting device must be repositioned accordingly
Solution Approach 1:
The second focus adjusting device is nested within or coupled to the first focus adjusting device, creating a hierarchical structure where the first device provides the outer stage for coarse adjustments and the second device provides the inner stage for fine adjustments. This nesting arrangement ensures that when the first device moves, the second device is automatically repositioned to the correct location, maintaining the focus beam's accuracy while achieving extensive depth adjustment range.
3Length of stationary object
If a focus adjusting device with large stroke is used, then the depth adjustment range is increased, but the adjustment resolution is reduced
Solution Approach 1:
The depth adjustment function is segmented into two ranges: a first depth distance range handled by the first focus adjusting device with large stroke but lower resolution, and a second depth distance range handled by the second focus adjusting device with smaller stroke but high resolution. This segmentation allows the system to achieve both large overall adjustment range and fine positioning precision by combining the capabilities of the two devices.
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 configuration enables the generation of diverse irradiation patterns and enhances the precision and range of applications, including ophthalmological treatments and other microscopy techniques, by allowing for both coarse and fine focus adjustments.
Implementation Method 1
laser pulses effect a photodisruption and/or photoablation in a focus situated within the organic tissue to remove a tissue, in particular a tissue lenticule, from the cornea
Implementation Method 2
laser pulses effect a photodisruption and/or photoablation in a focus situated within the organic tissue to remove a tissue, in particular a tissue lenticule, from the cornea
Implementation Method 3
focus adjusting devices, which are formed to adjust a focus position of a laser beam of the laser in a depth direction
Data Source
AI summary
A treatment apparatus with at least one ophthalmological laser is disclosed, wherein the treatment apparatus includes at least two focus adjusting devices, which are formed to adjust a focus position of a laser beam of the laser in a depth direction, wherein the first focus adjusting device is formed to adjust the focus point over a first depth distance range with a first speed, and wherein the second focus adjusting device is formed to adjust the focus point over a second depth distance range with a second speed, wherein the first depth distance range is larger than the second depth distance range and the first speed is smaller than the second speed.