Orthopedic Device Coating Reduces Ion Release
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Solution Overview
Problem
Current orthopedic medical devices made from common metal alloys like stainless steel, cobalt-chromium, and TiNi suffer from issues such as nickel and chromium ion release, leading to allergic reactions and implant failure, while being too brittle for many orthopedic applications.
Innovation Solution
The development of an orthopedic medical device coated with a metal oxynitride layer, specifically titanium oxynitride and/or zirconium oxynitride, which reduces metal ion release, enhances strength and surface hardness, promotes nitric oxide formation, and improves biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If common metal alloys (stainless steel, cobalt-chromium, TiNi) are used for orthopedic devices, then strength and durability are achieved, but nickel and chromium ion release causes allergic reactions and implant failure
Solution Approach 1:
A coating layer is applied as an intermediary between the metal alloy device and the patient's body. This coating reduces metal ion release while maintaining the structural strength of the underlying alloy, thereby eliminating allergic reactions without compromising device integrity
Solution Approach 2:
The device transitions from a single-material construction to a composite structure combining metal alloy with coating materials. This composite approach leverages the strength of the alloy while the coating provides biocompatibility and reduces harmful ion release
2Object-generated harmful factors
If nickel and chromium content is reduced or eliminated, then allergic reactions are reduced, but the metal alloy becomes too brittle for orthopedic applications
Solution Approach 1:
The device is segmented into two functional parts: the metal alloy core providing mechanical strength and the coating layer providing biocompatibility. This segmentation allows each material to optimize its properties without compromising the other
Solution Approach 2:
The coating acts as an intermediary layer that isolates the patient's body from the metal alloy, allowing the use of nickel-free and chromium-free alloys while maintaining the necessary mechanical properties through the coating's protective function
3Object-generated harmful factors
If a coating is applied to reduce metal ion release, then biocompatibility is improved, but device complexity increases
Solution Approach 1:
A single coating layer is applied as an intermediary to reduce metal ion release. This coating can be applied through established manufacturing processes and provides the necessary biocompatibility without requiring complex multi-layer structures or additional components
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 coated orthopedic medical device exhibits reduced ion release, improved mechanical properties, enhanced bone healing, reduced bacterial growth, and improved biocompatibility, leading to increased success rates after implantation.
Implementation Method 1
reduces metal ion release
Implementation Method 2
promotes the formation and/or release of nitric oxide (NO) from the implanted orthopedic medical device
Implementation Method 3
has an outer surface that promotes bone healing about the implanted orthopedic medical device
Data Source
AI summary
An orthopedic medical device that is at least partially coated with an enhancement coating, and a method for inserting the orthopedic medical device in a patient. One type of enhancement coating that can be used includes titanium oxynitride or titanium nitride oxide (TiNOx) and/or zirconium oxynitride (ZrNxOy).