Polymer-Coated Bone Fixation Implant Prevents Galvanic Corrosion
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Solution Overview
Problem
Current bone fixation implants face challenges in providing safe, reproducible, and minimally painful solutions for supporting and promoting healing of fractured or broken bones, particularly due to potential corrosion from direct contact between dissimilar metal components in the presence of bodily fluids, which can lead to complications such as pain and further surgery.
Innovation Solution
The development of bone fixation implants with a polymer body surrounding a metal structural portion, preventing direct contact between the metal and other implant components, and featuring a bone-engaging surface and tissue-engaging surface with openings and channels for secure attachment and tissue incorporation, utilizing materials like PEEK and metals like titanium or stainless steel to enhance engagement and stability while minimizing corrosion risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple metal components are used in bone fixation implants, then the structural strength and fixation capability are improved, but the risk of corrosion increases due to direct contact between dissimilar metals in bodily fluids
Solution Approach 1:
The patent employs a polymer coating as an intermediary layer between dissimilar metal components (e.g., titanium alloy structural portion and stainless steel attachment members). This coating prevents direct galvanic contact while allowing mechanical fastening, thereby eliminating corrosion risk while maintaining the strength benefits of using multiple metal components with different properties.
2Reliability
If a polymer coating is applied to prevent corrosion, then the safety and durability are improved, but the complexity of manufacturing increases
Solution Approach 1:
The patent creates a composite structure where a polymer coating is applied over a metal structural portion. This composite approach provides corrosion protection while maintaining structural integrity. The manufacturing process involves coating the metal component before assembly, which is a standard industrial process that balances protection needs with manufacturing feasibility.
3Stability of the object's composition
If the implant structure is made more complex with multiple components, then the fixation stability and tissue incorporation are improved, but the risk of corrosion from metal contact increases
Solution Approach 1:
The polymer coating serves as a mediator that enables the multi-component structure to achieve fixation stability through mechanical interlocking and tissue incorporation, while simultaneously preventing galvanic corrosion between dissimilar metals. The coating allows attachment members to secure the implant to bone while isolating metal surfaces from direct contact.
Data Source
AI summary
A plating system is described that uses various configurations of bone fixation implants that are configured to be attached to one or more portions of bone. The bone fixation implant may include at least one structural portion (e.g., a wire, plate, mesh, etc.) that includes metal and a polymer body at least partially surrounding the at least one structural portion. The polymer body may define an engaging surface that is configured to engage an attachment member that is applied to the bone fixation implant to fix the bone fixation implant to the bone, such that direct contact between the metal of the structural portion and the attachment member is prevented. Overlying muscle and tissue may be secured to the bone fixation implant to encourage incorporation of the tissue structure into the implant and promote stabilization and healing.