Scleral Marker With Dual Pointers For Ophthalmic Injection
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Solution Overview
Problem
Existing scleral markers, such as the Melki marker, face challenges in accurately creating a depression on the scleral limbal surface for precise needle injection, often resulting in patient discomfort due to inaccurate placement.
Innovation Solution
A surgical instrument with a 150° bent handle featuring a conical-tipped first pointer and a blunt-tipped second pointer, spaced 3.5 mm apart, creates distinct depressions on the scleral surface, facilitating precise marking and injection while minimizing discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Melki marker is pressed against the eye to create a depression for needle injection, then the injection position can be marked, but the depression is too small and difficult to accurately target, resulting in patient pain
Solution Approach 1:
The instrument applies different local qualities to different parts of the marking function. The first pointer has a sharp point for creating a precise, small depression at the exact injection site, while the second pointer has a blunt end for creating a larger, more visible depression. This differentiation of local qualities allows the small precise mark to be easily located through the larger mark, resolving the contradiction between precision and ease of targeting.
2Manufacturing precision
If a sharp pointer is used to create a precise depression, then the injection location is accurate, but the depression area is too small making it difficult to target
Solution Approach 1:
The marking function is segmented into two distinct pointers with different functions. The first pointer creates a small, precise depression for accurate injection location, while the second pointer creates a larger depression that serves as a visual target. This segmentation allows both precision and adequate target area to be achieved simultaneously by dividing the marking task between two separate elements.
3Ease of operation
If the blunt pointer creates a large depression, then it is easy to target, but it does not provide precise injection location marking
Solution Approach 1:
The larger depression created by the blunt second pointer serves as an intermediary target that guides the needle to the precise injection site. The sharp first pointer creates the actual precise marking, but the larger depression acts as an intermediary visual cue that makes it easier to locate and target the smaller, more precise depression for accurate injection.
Data Source
AI summary
A surgical instrument for marking spots at locations on the scleral limbal surface of a human eye. The instrument includes an elongated handle dimension to be handheld. A first elongated pointer extends substantially axially outwardly from one end of the handle. This pointer has a pointed free end which, when pressed against the scleral limbal surface, creates a depression in the scleral surface having a first area. A second elongated pointer also extends substantially axially outwardly from the end of the handle. The second pointer has a blunt free end which, when pressed against the scleral limbal surface, creates a depression in the scleral surface having a second area which is several times in magnitude the area of the first area.