Interdental Brush Wire Core With Filament Backup Against Fatigue Breakage

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Solution Overview

Problem

Conventional interdental brushes face safety risks due to frequent stainless steel wire breakage, leading to potential injury and ingestion hazards when the wire detaches from the handle.

Innovation Solution

A safety interdental brush design featuring a wire core composed of helically wound stainless steel and non-metallic filament, such as nylon or polyester fiber, ensures the filament remains intact even if the steel wire breaks, maintaining the connection between brush head segments and preventing detachment from the handle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If stainless steel wire is used as the core wire, then the wire provides sufficient strength and structural support, but the wire breaks due to fatigue during use causing detachment

Engineering Contradiction:

Improvewire strengthVSAvoidwire reliability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The core wire is constructed as a composite structure combining stainless steel wire and non-metallic filament wound helically together. The stainless steel provides tensile strength and structural support, while the non-metallic filament provides flexibility and prevents complete failure when the metal wire breaks due to fatigue. This composite approach resolves the contradiction by maintaining strength while improving reliability.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If stainless steel wire is used, then the brush head maintains structural integrity, but when the wire breaks it causes safety hazards from detached metal wires

Engineering Contradiction:

Improvebrush head integrityVSAvoidinjury risk

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The non-metallic filament acts as an intermediary element between the stainless steel wire segments. When the metal wire breaks, the filament continues to hold the broken segments together, preventing complete detachment of the brush head and eliminating the safety hazard of loose metal wires in the user's mouth.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If a single material wire is used, then the manufacturing process is simple, but the wire is prone to breakage under fatigue conditions

Engineering Contradiction:

Improvewire manufacturingVSAvoidwire durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The wire is manufactured by helically winding stainless steel wire and non-metallic filament together, creating a composite structure that leverages the advantages of both materials. While slightly more complex than single-material wire, the manufacturing process remains feasible and produces a significantly more durable product resistant to fatigue-induced breakage.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20260047667A1Safety interdental brush

Publication Date: 2026.02.19 NI CHIN SHENG

AI summary

A safety interdental brush is provided that prevents detachment of the brush wire during use, thereby protecting the user. The brush comprises a handle and a brush head fixed to one end of the handle. The brush head includes a wire core and multiple bristles evenly distributed on the outer surface of the wire core. The wire core is composed of at least one stainless steel wire and at least one non-metallic filament, helically wound together. Even if the stainless steel wire breaks due to fatigue, the filament remains intact and continues to connect the broken segments, preventing detachment of the brush head from the handle and ensuring user safety.