Corneal Marker Tilt Detector for IOL Alignment
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Solution Overview
Problem
Current methods for aligning intraocular lenses (IOLs) during cataract surgery, particularly for patients with corneal astigmatism, lack accuracy in identifying the steep axis of the cornea, leading to inadequate vision correction and the need for post-surgical glasses.
Innovation Solution
The development of corneal markers with tilt detectors and rotating rings that allow for precise marking of the cornea's steep axis, ensuring accurate alignment of toric IOLs by using dye-coated tabs and a system of reference marks, with optional electronic levels for ensuring the marker is held horizontally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional corneal marking methods are used, then the procedure is simple, but the alignment precision of the IOL with the steep axis is insufficient
Solution Approach 1:
The patent introduces an intermediary system consisting of a corneal marker with tilt detector and rotating ring that mediates between the surgeon's manual marking process and the required precise alignment. The tilt detector acts as an intermediary sensor that provides objective feedback on marker orientation, while the rotating ring serves as an intermediary mechanical device that enables precise angular positioning, thereby achieving improved alignment precision without requiring complex automated surgical systems
Solution Approach 2:
The patent implements feedback through the tilt detector that provides real-time information about the angular orientation of the corneal marker relative to the steep axis. This feedback mechanism allows the surgeon to adjust the marker position and achieve accurate alignment, resolving the contradiction by providing measurement precision through a relatively simple feedback loop rather than complex automated control systems
2Measurement precision
If manual marking without tilt detection is used, then the device is simple to operate, but the accuracy of identifying the steep axis is insufficient
Solution Approach 1:
The tilt detector enables the marking system to self-correct and self-verify its orientation without requiring external verification or complex surgical judgment. The device essentially serves itself by providing automatic angular measurement and feedback, improving steep axis identification accuracy while maintaining ease of operation because the surgeon simply follows the device's indicated orientation rather than performing complex manual alignment procedures
3Manufacturing precision
If a rotating ring with axis marking tabs is used, then the marking precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the marking device into distinct functional modules: a fixed corneal marker component, a rotating ring component with degree markings, and axis marking tabs. This segmentation allows each component to be optimized independently for its specific function while maintaining overall simplicity, achieving improved marking precision through modular design rather than monolithic complexity
Solution Approach 2:
The rotating ring introduces controlled dynamics to the otherwise static marking device. The ring can rotate to different angular positions to mark various axes, providing versatility and precision. This dynamic element improves marking precision by enabling multiple angular positions while adding minimal complexity because the rotation mechanism is simple and the ring can be manually positioned and locked at desired angles
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
Enables accurate alignment of IOLs with the steep axis, maximizing astigmatic correction and reducing the need for post-surgical glasses by providing a convenient and precise method for marking the cornea during surgery.
Implementation Method 1
The marker includes a tilt detector for detecting an angular orientation of the marker
Implementation Method 2
with optional electronic levels for ensuring the marker is held horizontally
Data Source
AI summary
A corneal marking system, and methods for its use, has a tilt-detecting device attached to a corneal marker, adapted to produce a signal when the corneal marker is in a horizontal position. Use of measurement devices may be coordinated between the marker and a level-measuring device positioned on a patient's head. Devices capable of measuring one, two or three axes are used and processors are provided to evaluate the data produced by the devices and provide a physician with a signal that the positions of the patient's head and the marker are such that an accurate marking procedure can be performed.