Endoprosthesis Coating with Intermediate Silver Layer for Antimicrobial Release
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Solution Overview
Problem
Endoprosthesis components face challenges with microbial settlement on their surface, leading to hindered integration into the human body, particularly in large intervention surgeries where a significant area of the component comes into contact with tissue, due to the slow release of silver particles from hard material coatings which are insufficient to effectively combat microorganisms immediately after implantation.
Innovation Solution
An endoprosthesis component design featuring an intermediate layer of silver, copper, or gold between the outer nitride, oxynitride, or oxide coating and the body, with the intermediate layer being partially accessible from the outside, allowing for a higher initial release of antimicrobial agents and incorporating a porous or micro/nanostructured outer layer to enhance antimicrobial effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard material coating (nitride, oxynitride, or oxide) is applied to the endoprosthesis surface, then mechanical properties and abrasion resistance are improved, but the release of antimicrobial agents is too slow to be effective against large numbers of microorganisms immediately after implantation
Solution Approach 1:
The coating is segmented into multiple functional layers: an outer hard material layer (nitride, oxynitride, or oxide) providing mechanical strength and abrasion resistance, and an inner intermediate layer containing silver particles that provides antimicrobial protection. This segmentation allows each layer to fulfill its specific function without compromising the other.
Solution Approach 2:
The coating system uses composite materials by combining the hard material (for mechanical properties) with silver-containing intermediate layer (for antimicrobial effect). This composite structure enables simultaneous achievement of mechanical strength and biological functionality.
2Duration of action of stationary object
If silver particles are incorporated into the hard material layer, then long-term antimicrobial effect is achieved, but the initial release rate is insufficient to combat microorganisms immediately after surgery
Solution Approach 1:
The intermediate layer is prepared in advance with a high concentration of silver particles, creating a reservoir that can rapidly release antimicrobial agents immediately after implantation. This preliminary preparation ensures that the full antimicrobial effect is available from the start, before the slower long-term release from the hard material layer takes over.
Solution Approach 2:
The intermediate layer acts as an intermediary between the hard material outer layer and the underlying substrate. It mediates the release of silver particles, providing both immediate antimicrobial protection and serving as a transition zone that enables controlled long-term release while maintaining mechanical integrity.
3Reliability
If the outer layer is made porous or micro/nanostructured, then antimicrobial effectiveness is enhanced, but manufacturing complexity increases
Solution Approach 1:
The outer hard material layer is designed with a porous or micro/nanostructured morphology, which increases the surface area available for antimicrobial action and facilitates faster release of silver particles from the intermediate layer. This porous structure enhances the biological functionality while the coating process integrates this feature through controlled deposition parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces the probability of microbial hindrance by providing an immediate antimicrobial effect post-surgery through a higher dose of antimicrobial agents and enhances mechanical properties with improved abrasion resistance and compatibility.
Implementation Method 1
surface portions of the endoprosthesis component which are designed for contact with human tissue are covered with an outer layer (25) made of a hard material such as a nitride, an oxynitride or an oxide based on a refractory metal
Implementation Method 2
The intermediate layer (24) comprises silver and/or copper and/or gold and that parts of the intermediate layer (24) are accessible from the outside
Data Source
Figure 1
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AI summary
The invention relates to an endoprosthesis component (17) and a method for producing an endoprosthesis component (17). The endoprosthesis component (17) comprises a body (23) determining the shape of the endoprosthesis component (17). The body (23) is coated with an outer layer (25) on surface sections (22) that are in contact with human tissue when the endoprosthesis component is in the implanted state, said outer layer comprising a nitride, an oxynitride, or an oxide based on a refractory metal and comprising silver and/or copper. According to the invention, an intermediate layer (24) is disposed between the outer layer (25) and the body (23) such that parts of the intermediate layer (24) are accessible from the exterior. The endoprosthesis component (17) is produced using the method according to the invention. The invention allows the outer layer (25) to be used to create a long-term antimicrobial action and, in addition, allows the intermediate layer (24) to act on the surrounding tissue.