Medical Solution Applicator Cap Structure to Prevent Brush Damage

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Solution Overview

Problem

The existing medical solution applying containers face issues where the brush is damaged during assembly due to interference with the cap, leading to defects in the manufacturing process.

Innovation Solution

A medical solution applying tool with a design that includes a brush, an inside stopper, and a cap, where the brush and stopper are fitted into a closed-end hole of the cap, and the cap is held by a thread mechanism, allowing for secure transportation and assembly without damaging the brush.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the cap is assembled to the medical solution container body after the brush is attached to the inside stopper, then the medical solution applying container can be completed, but the brush may be damaged due to interference with the cap

Engineering Contradiction:

Improveassembly processVSAvoidbrush integrity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The brush and inside stopper are nested within the cap during transportation, with the cap serving as a protective container. The inside stopper is inserted into the cap through a fit-insertion closed-end hole, and the brush is attached to the inside stopper, creating a nested structure that prevents brush damage during handling and assembly.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The brush is pre-attached to the inside stopper before the cap is assembled to the medical solution container body. The inside stopper with the attached brush is then inserted into the cap, which is subsequently assembled to the container body. This preliminary attachment ensures the brush is protected within the cap structure during the assembly process.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the brush is attached to the inside stopper before cap assembly, then the applying tool is complete, but the brush is vulnerable to damage during cap assembly

Engineering Contradiction:

Improveassembly efficiencyVSAvoidbrush damage risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The brush and inside stopper assembly is nested within the cap structure, where the inside stopper is inserted through a fit-insertion closed-end hole in the cap. This nesting arrangement protects the brush from external forces and interference during cap assembly and transportation.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The inside stopper acts as an intermediary component between the brush and the cap. It provides a protective interface, allowing the brush to be attached while maintaining separation from direct contact with the cap, thereby reducing the risk of brush damage during assembly operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If the cap is separated from the inside stopper during transportation, then assembly flexibility is improved, but the brush becomes exposed and susceptible to damage

Engineering Contradiction:

Improveassembly flexibilityVSAvoidbrush exposure to damage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The inside stopper with the attached brush is nested within the cap during transportation, creating a protected configuration. The cap serves as a protective shell that shields the brush from external damage while maintaining the ability to disassemble and reassemble the components when needed.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS12484684B2Medical solution applying tool and medical solution applying container including same

Publication Date: 2025.12.02 TAISEI KAKO CO LTD

AI summary

A medical solution applying tool is composed of a brush, an inside stopper to which the brush is attached, and a cap including a fit-insertion closed-end hole into which the brush and a distal end portion of the inside stopper are fittingly inserted. The inside stopper is provided with a holding portion holding the cap such that the brush and the distal end portion of the inside stopper are fittingly inserted into the fit-insertion closed-end hole, whereas the cap is provided with a held portion held by the holding portion.