Toothbrush Head Bristle Configuration for Interproximal Cleaning
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Solution Overview
Problem
Conventional toothbrushes lack an optimal bristle configuration that effectively cleans interproximal spaces, gingival margin, and subgingival areas, as they often rely on a single type of bristle material which may not adequately reach or clean these areas.
Innovation Solution
A toothbrush head design featuring a combination of tufts with co-extruded bristles, unitary bristles, and tapered bristles, where co-extruded and unitary bristles are mixed in clusters near the distal and proximal ends, and tapered bristles are positioned on the sides, with longer tapered bristles in the central area, all extending perpendicularly from the bristle surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single type of bristle material is used, then the device complexity is reduced, but the cleaning efficacy in interproximal spaces, gingival margin, and subgingival areas deteriorates
Solution Approach 1:
The toothbrush head is divided into multiple tuft groups, each containing different types of bristles (tapered, co-extruded, unitary) positioned at specific locations. This segmentation allows different bristle types to target different areas (interproximal spaces, gingival margin, subgingival areas) simultaneously, resolving the contradiction between simple configuration and effective cleaning.
Solution Approach 2:
Different bristle types are strategically positioned in specific tuft groups throughout the bristle surface. Tapered bristles are placed in certain tufts for interproximal access, co-extruded bristles in others for plaque removal, and unitary bristles in additional tufts for gum line cleaning. This local differentiation of bristle properties across the toothbrush head enables zone-specific cleaning functions while maintaining an integrated device structure.
2Ease of operation
If tapered bristles are used, then the ability to reach interproximal spaces is improved, but the flexibility and bending characteristics change compared to non-tapered bristles
Solution Approach 1:
The bristle population is segmented into tapered and non-tapered types, with tapered bristles specifically allocated to certain tuft groups where interproximal access is needed, while non-tapered bristles are used in other tufts where structural flexibility is prioritized. This segmentation allows the toothbrush to achieve both interproximal access capability and overall bristle flexibility.
Solution Approach 2:
The toothbrush employs a composite bristle system combining tapered bristles (for rigidity and penetration) with non-tapered bristles (for flexibility). This composite approach balances the conflicting mechanical properties, allowing tapered bristles to provide the necessary stiffness for reaching between teeth while the mixed bristle composition maintains overall flexibility for comfortable operation.
3Reliability
If co-extruded bristles with thermoplastic elastomer core and polyester sheath are used, then the plaque removal capability is improved, but the manufacturing complexity increases
Solution Approach 1:
Co-extruded bristles are assigned to specific tuft groups rather than being distributed throughout the entire toothbrush head. This segmentation limits the application of the more complex co-extrusion technology to only those areas where superior plaque removal is most beneficial, thereby reducing the overall manufacturing complexity while maintaining enhanced cleaning performance in critical zones.
Solution Approach 2:
The advanced co-extruded bristle technology is applied locally to specific tuft groups where maximum plaque removal benefit is expected, rather than uniformly across all bristles. This localized application of enhanced bristle construction optimizes the balance between cleaning efficacy and manufacturing complexity by using the more complex bristle type only where it provides the greatest value.
Data Source
AI summary
A toothbrush head having a bristle surface with tufts of bristles extending therefrom comprising: first tufts of a mixture of co-extruded bristles and unitary bristles located adjacent to the distal end of the bristle surface; second tufts comprising a mixture of co-extruded bristles and unitary bristles located adjacent to the proximal end of the bristle surface; third tufts comprising tapered bristles located adjacent to the widthways opposite sides of the bristle surface; and fourth tufts comprising a mixture of co-extruded bristles and tapered bristles longer than the co-extruded bristles located as a cluster of fourth tufts widthways between the third tufts and longitudinally between the first and second tufts.