Corneal Linear Axis Marker for Astigmatism Alignment
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Solution Overview
Problem
In refractive cataract surgery, there is a need to accurately mark the corneal surface to properly position treatments for astigmatism, as existing methods lack precision and reliability.
Innovation Solution
The development of a corneal linear axis marker (CLAM) that creates a precise linear mark on the cornea from limbus to limbus, aligning with the steepest meridian for correction, using a planar base with a central opening and a linear marker that extends across the opening, secured by knots to prevent premature marking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing marking methods are used, then the marking process can be completed, but the precision and reliability of the corneal mark are insufficient
Solution Approach 1:
The marking device is divided into distinct functional components: a planar base for stability, a central opening for corneal access, a linear marker for precise marking, and vertical walls for positioning. This segmentation allows each component to be optimized for its specific function, thereby improving both precision and reliability of the corneal mark.
Solution Approach 2:
The linear marker is pre-positioned across the central opening and secured with knots before actual use. The device is pre-aligned with the cornea using the planar base and vertical walls, ensuring that when marking occurs, the precision and reliability are already established by the preliminary positioning and securing actions.
2Measurement precision
If a linear marker is used to mark the cornea, then precise alignment can be achieved, but premature marking may occur before proper positioning
Solution Approach 1:
The linear marker is pre-secured to the planar base using knots at both ends, preparing it for marking while preventing premature contact with the cornea. The device structure itself is designed to be positioned first, with the marker ready but controlled, ensuring marking occurs only after proper alignment is achieved.
Solution Approach 2:
The knots securing the linear marker create a mechanical constraint that prevents the marker from contacting the cornea prematurely. This preliminary anti-action (preventing premature marking) allows the device to be positioned and aligned correctly before the marking function is activated, thereby controlling the timing of the marking action.
3Reliability
If the linear marker is secured to the planar base, then premature marking is prevented, but the device complexity increases
Solution Approach 1:
The securing mechanism is segmented into simple, discrete knots at each end of the linear marker, rather than using a complex continuous attachment system. This segmentation maintains reliability by securing the marker at critical points while minimizing overall device complexity through simple, localized fastening elements.
Data Source
AI summary
A device for marking a corneal surface of an eye includes a planar base having a central opening, a marking side, and a non-marking side, a linear marker extending across the central opening, and an outer circumference of the planar base having a wall extending vertically away from the non-marking side.