Wave-Shaped Toothbrush Head with Alternating Filament Cross-Sections
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Solution Overview
Problem
Conventional oral care implements, such as toothbrushes, are inadequate in effectively removing plaque and debris from interproximal and gingival marginal regions due to their design, which limits their cleaning efficiency in hard-to-reach areas.
Innovation Solution
A head for an oral care implement featuring a row of tufts with filaments of varying lengths and cross-sectional areas arranged in an alternating pattern to form a continuous wave-shape, allowing for improved contact with tooth surfaces and enhanced cleaning capabilities in interproximal and gingival areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toothbrush designs with uniform filaments are used, then the structure is simple and easy to manufacture, but the cleaning effectiveness in interproximal and gingival marginal regions is insufficient
Solution Approach 1:
The patent applies local quality by creating different filament types within the same brush head - some filaments have smaller cross-sectional areas for penetrating interproximal spaces, while others have larger cross-sectional areas for scrubbing flat surfaces. This localized differentiation of filament properties within specific tufts enables targeted cleaning effectiveness in different oral regions without requiring completely different brush designs.
Solution Approach 2:
The patent segments the brush head into multiple rows and tufts with different filament configurations. Each row can contain tufts with varying filament cross-sectional areas arranged in alternating patterns, allowing different segments of the brush to perform different cleaning functions simultaneously, thereby improving overall cleaning effectiveness while maintaining a relatively simple integrated structure.
2Reliability
If filaments with varying cross-sectional areas are used, then cleaning performance in different areas is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by incorporating filaments with different cross-sectional areas in specific alternating patterns within tufts. This allows manufacturing processes to use standardized filament production methods while achieving varied cleaning properties in different locations, balancing manufacturing simplicity with performance differentiation.
Solution Approach 2:
The patent merges multiple filament types with different cross-sectional areas into integrated tuft assemblies that are then assembled into the brush head in alternating patterns. This combining approach allows manufacturers to produce different filament types using conventional processes and then assemble them into complex functional patterns, reducing overall manufacturing complexity compared to creating entirely new brush architectures.
3Area of stationary object
If a continuous wave-shape configuration is used, then contact area with teeth is increased, but the structure becomes more complex
Solution Approach 1:
The patent applies curvature by arranging filaments in continuous wave-shaped patterns rather than straight lines. This wave configuration increases the contact area between the brush head and tooth surfaces by conforming to the curved anatomy of teeth, while the regular repeating pattern of the waves maintains manufacturing simplicity through standardized molding or assembly processes.
Solution Approach 2:
The patent combines the wave-shaped structural configuration with alternating filament arrangements within the same tuft system. This integration allows the structural curvature to provide increased contact area while the filament variation within tufts provides functional differentiation, achieving both goals without requiring separate complex systems.
Data Source
Figure 1
Figure 2~3
AI summary
A head for an oral care implement comprises at least a first row of tufts comprising a plurality of filaments having free ends and fixed ends being opposite the free ends and being fixed on a mounting surface of the head. The filaments of the at least first row of tufts extend from the mounting surface of the head in different length extensions thereby defining with the filaments' free ends an upper top cleaning surface in the form of a continuous wave-shape. Each filament has a longitudinal axis and a cross-sectional area extending in a plane that is perpendicular to the longitudinal axis. Each tuft of the at least first row comprises either filaments with a smaller cross-sectional area or filaments with a larger cross-sectional area, and the tufts are arranged in an alternating manner so that a tuft comprising filaments with the smaller cross-sectional area alternate with a tuft comprising filaments with the larger cross-sectional area.