Refractory Alloy Coating for Stronger, Biostable Medical Implants
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Solution Overview
Problem
Common metal alloys used in medical devices, such as stainless steel, cobalt-chromium alloys, and TiAlV alloys, have deficiencies in properties like strength, durability, biostability, and biocompatibility, which affect their performance and compatibility with the human body.
Innovation Solution
A refractory metal alloy, including at least 20 wt.% of Mo, Re, Nb, Ta, or W, is used to form medical devices, optionally coated with a protective layer to enhance properties such as strength, durability, and biocompatibility, while maintaining a reduced bulk and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If common metal alloys (stainless steel, cobalt-chromium, TiAlV) are used for medical devices, then manufacturing ease and cost-effectiveness are maintained, but strength, durability, and biostability are insufficient
Solution Approach 1:
The patent changes the material composition parameters by using refractory metal alloys containing at least 20 wt.% of Mo, Re, Nb, Ta, or W, which fundamentally alters the strength and durability properties compared to conventional alloys
Solution Approach 2:
The invention employs composite material structures by combining refractory metal alloys with protective coatings, creating a multi-layered material system that achieves superior mechanical properties and biocompatibility
2Reliability
If refractory metal alloys are used to improve strength and biostability, then device performance is enhanced, but device complexity increases
Solution Approach 1:
The patent specifies precise compositional parameters (at least 20 wt.% of specific refractory metals) to control biostability and reduce device complexity by providing clear manufacturing guidelines
Solution Approach 2:
The protective coating acts as an intermediary layer between the refractory metal alloy and the biological environment, simplifying the overall device design while enhancing biocompatibility
3Object-affected harmful factors
If refractory metal alloys with protective coatings are used, then biocompatibility and reduced tissue reactions are achieved, but manufacturing complexity increases
Solution Approach 1:
The protective coating serves as an intermediary that interfaces with biological tissues, reducing adverse reactions while the patent provides specific compositional guidelines to manage manufacturing complexity
Solution Approach 2:
By defining specific compositional parameters for the refractory metal alloy (at least 20 wt.% of Mo, Re, Nb, Ta, or W), the patent creates a controlled material system that balances biocompatibility with manufacturability
4Strength
If refractory metal alloys are used to improve radial strength and yield strength, then device mechanical performance is enhanced, but device weight increases
Solution Approach 1:
The patent utilizes the high strength-to-weight ratio of refractory metal alloys by specifying compositional parameters (at least 20 wt.% of Mo, Re, Nb, Ta, or W) to achieve enhanced radial strength while controlling weight
Solution Approach 2:
The combination of refractory metal alloy with protective coating creates a composite structure that optimizes the strength-weight ratio by leveraging the high strength properties of the alloy while the coating provides additional functional benefits
Data Source
AI summary
A metal alloy and that includes an enhancement coating material. The metal alloy includes rhenium and one or more additives. The enhancement coating is at least partially applied to the metal alloy by a physical vapor deposition (PVD) process, a chemical vapor deposition (CVD) process, an atomic layer deposition (ALD) process, a plasma-enhanced chemical vapor deposition (PE-CVD) process, ion implantation, direct energy deposition (DED), and/or thermal spray techniques like plasma arc spraying, flame spraying, high velocity oxy fuel spraying (HVOF). The enhancement coating is formed of a) 35-95 wt. % zirconium and wherein said enhancement coating includes ZrN, ZrNC, ZrOC or a combination of ZrN and ZrO2, b) 20-85 wt. % titanium and one or more of carbon, nitrogen, oxygen, rhenium, and silicon, c) 40-85 wt. % chromium and one or more of carbon, nitrogen, oxygen, rhenium, and silicon, or d) at least 60 wt. % carbon.