Reflective Medical Markers With Internal Foil And Balanced Hemispheres
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Solution Overview
Problem
Existing reflective medical markers face issues with rough external surfaces and unpredictable centers of gravity due to external coatings, leading to inefficiencies and inaccuracies in manufacturing and application.
Innovation Solution
The method involves preparing hemispheres with an adhesive coating and applying a heated foil sheet within a pressurized gas chamber for seamless and even coverage, followed by joining the hemispheres with a specialized central pin to create balanced and smooth spherical markers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If external coating methods (dust and paint) are used on markers, then reflective properties are achieved, but the external surface becomes rough and symmetry is lost
Solution Approach 1:
Instead of coating the external surface of the marker with reflective material (which causes roughness), the patent inverts the approach by placing reflective material inside a transparent or translucent shell. The reflective hemisphere is positioned internally, allowing light to enter through the shell, reflect off the internal surface, and exit back through the shell, achieving reflectivity without external coating roughness.
2Shape
If internal marking materials are used, then smooth external surfaces are maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The marker is divided into two separate hemispherical shells that are manufactured independently and then joined together. This segmentation allows each shell to be formed using simple injection molding processes, avoiding complex manufacturing steps while achieving the internal reflective structure. The hemispheres are joined with precision features to maintain symmetry and smooth external surfaces.
3Illumination intensity
If external coating is applied to achieve reflectivity, then reflective function is provided, but center of gravity becomes unpredictable
Solution Approach 1:
The reflective hemisphere is positioned precisely at the geometric center of the spherical marker, creating a homogeneous and symmetric mass distribution. This central positioning ensures that the center of gravity remains predictable and stable, unlike external coatings that can be unevenly distributed. The symmetric design of the two joined hemispherical shells further reinforces this central balance.
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 results in superior reflective markers with enhanced reflective properties and smooth exterior surfaces, while improving manufacturing efficiency and maintaining a true center of gravity, overcoming the limitations of internal marking methods.
Implementation Method 1
The chamber and gas system soften the reflective foil causing the reflective foil to seamlessly and evenly adhere to the hemisphere
Data Source
AI summary
Identical plastic hemispheres are first treated with organic solvent, which is smeared by a pillow of microporous silicon rubber to achieve a slippery surface upon the hemispheres. The slippery surface upon the hemispheres may comprise a layer of melted plastic. Hemispheres are then placed under an application chamber, where hot gas under pressure softens, deforms and transports a sheet of marker foil over the hemisphere. Two hemispheres are then joined together by use of asymmetric voids and a clip pin inserted, while under compression, into the hemispheres.