Titanium Implant Surfaces with Micro-Nano Roughness for Osteoinduction
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Solution Overview
Problem
Current orthopedic implants face challenges in achieving rapid and high-quality osseointegration due to smooth surfaces, which hinder bone integration, and surfaces with projections can impede integration, leading to slow healing and prolonged recovery times.
Innovation Solution
The development of osteoinducting surfaces through additive manufacturing followed by mechanical and chemical erosion to create micro-scale and nano-scale structures, enhancing bone-contacting and free surfaces for improved osteoinduction and osteogenesis, facilitating faster and more robust bone growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If smooth surfaces are used on orthopedic implants, then manufacturing is easier, but bone integration is slow and poor
Solution Approach 1:
The patent applies parameter changes by transforming the surface topology from smooth to rough through additive manufacturing parameters. The surface roughness parameters (Ra, Rq, Rz) are controlled during the additive manufacturing process to create optimal bone integration surfaces, changing the physical state of the surface from smooth to micro-rough without altering the bulk material properties.
Solution Approach 2:
The patent introduces another dimension by creating multi-scale surface roughness (micro-scale and nano-scale features) on the implant surface. This dimensional transformation from 2D smooth surface to 3D rough surface with varying depths and scales enhances bone cell attachment and integration while maintaining manufacturing feasibility through controlled additive processes.
2Productivity
If surfaces are adorned with teeth, spikes, grooves, and other projecting surfaces to enhance integration, then bone integration may improve, but these features can actually impede or avoid bone integration
Solution Approach 1:
The patent applies local quality by creating heterogeneous surface features with different roughness levels in specific zones. The additive manufacturing process enables localized control of surface topology, providing optimal roughness characteristics in bone-contacting areas while maintaining smooth surfaces in non-critical regions, thus enhancing integration without creating harmful projections.
Solution Approach 2:
The patent converts the potential harm of excessive surface projections into benefit by using controlled additive manufacturing to create optimal micro-roughness. The process transforms what could be harmful large-scale projections into beneficial micro-scale features that enhance bone integration while avoiding the pitfalls of macro-scale projections.
3Productivity
If additive manufacturing is used to create complex surface structures, then osteoinduction is enhanced, but the process complexity increases
Solution Approach 1:
The patent applies preliminary action by incorporating the osteoinductive surface structures directly during the additive manufacturing process itself, rather than requiring separate post-processing steps. The complex micro-roughness features are built-in from the start, reducing overall process complexity despite the sophistication of the resulting surface structures.
Solution Approach 2:
The patent merges the structural fabrication and surface treatment processes into a single additive manufacturing operation. By combining what would traditionally be separate steps (manufacturing the implant and then treating the surface) into one integrated process, the overall complexity is reduced while achieving enhanced osteoinduction.
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 processed surfaces significantly enhance osteoinduction, osteogenesis, and protein expression, leading to faster and more effective bone integration and healing, outperforming traditional surfaces without such structural features.
Implementation Method 1
additively manufacturing an orthopedic implant having one or more free surfaces and having one or more bone-contacting surfaces
Implementation Method 2
mechanically eroding the one or more bone-contacting surfaces
Implementation Method 3
chemically eroding the one or more bone-contacting surfaces
Data Source
AI summary
An orthopedic implant having a titanium or titanium alloy body with a plurality of surfaces. The orthopedic implant is produced according to a process comprising the steps of: (a) additively building the orthopedic implant; and then (b) mechanically, chemically, or mechanically and chemically eroding one or more surfaces of the orthopedic implant to (i) remove alpha case from, and (ii) impart an osteoinducting roughness including micro-scale structures and nano-scale structures into, the one or more surfaces.