Two-Step Molded Component for Medical Tool Handles
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Solution Overview
Problem
Molded items, particularly in the medical field, face challenges in achieving durability and aesthetic appeal due to limitations in single-material molding processes, which can lead to component separation during sterilization and compromised sterility.
Innovation Solution
A two-step molding process using a core within a mold to form the first component with structural features for direct attachment of a second component, allowing for varied material selection and adherence methods to enhance durability and appearance, including different colors, textures, and decorative features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple molded components are formed separately and mechanically interlocked, then various aesthetic and utilitarian properties can be provided, but the appearance becomes less desirable and the construction less durable
Solution Approach 1:
The patent merges multiple molded components into a single integrated molded structure. The handle assembly includes a first molded component and a second molded component that are formed as one piece through co-molding or overmolding processes, eliminating the need for mechanical interlocking while maintaining aesthetic appearance and structural durability.
Solution Approach 2:
The patent utilizes composite material structures where different materials are combined in a single molding process. The first molded component may be formed from a rigid material while the second molded component uses a softer material, creating a composite structure that provides both aesthetic properties and durability without requiring separate assembly.
2Ease of manufacture
If molded components are secured together, then the item can be assembled, but the components may separate during sterilization conditions
Solution Approach 1:
The patent combines multiple components into a single molded unit that cannot separate during sterilization. The integrated structure ensures that the handle components remain permanently united through the sterilization process, eliminating the risk of separation while maintaining ease of manufacture through one-piece molding.
Solution Approach 2:
The patent employs parameter changes in the molding process, such as varying temperature, pressure, and material flow characteristics, to create a monolithic structure. By controlling these parameters during co-molding, the patent ensures that the combined components form a unified structure with no interfaces that could separate during sterilization.
3Device complexity
If a single material is used in molding, then the process is simpler, but aesthetic appeal and material property variety are limited
Solution Approach 1:
The patent utilizes composite materials by combining different polymers or material types in a single molding process. The first molded component may use a rigid plastic material while the second molded component uses a softer, more flexible material, providing varied aesthetic appeal and functional properties without significantly increasing process complexity.
Solution Approach 2:
The patent applies local quality by using different materials in different regions of the same molded component. The first molded component and second molded component have distinct material properties tailored to their specific functional requirements, allowing aesthetic and utilitarian optimization in different areas while maintaining a unified molding process.
Data Source
AI summary
A process for producing molded products having portions formed with two separate materials is provided. The process involves forming a first component over a structural core in a first step, and forming a second component that is secured to the first component and the core in a second step. The second component can be formed directly over the first component or can be secured thereto after formation. The first and second components can additionally be formed with indicia thereon, or with recesses within which inserts containing the desired indicia can be positioned. Additionally, the first component can be formed with a ridge disposed on a projection formed on the first component that effectively seals off a portion of the first component when the second component is formed around the core and the first component to ensure the portion of the first component surrounded by the ridge remains visible after formation of the second component.