Bone Implant Surface Porosity for Osteoconductivity
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Solution Overview
Problem
Existing bone implants, particularly those made of metal or hard plastic, face challenges in promoting new bone growth due to adverse surface structures that hinder integration with the surrounding bone tissue, which is problematic for procedures requiring bone ingrowth for secure implantation.
Innovation Solution
A bone implant device with a 3-dimensional pattern of voids and indentations mimicking marine mammal bone structures, featuring a medium width of 30-300 microns and a fractal dimension of at least 3 microns, designed to enhance bone formation by replicating the porosity and architecture of cancellous bone, made from implantable plastics or metals like titanium alloys, and fabricated using additive techniques to ensure structural integrity and osteoconductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If smooth surface is used for implant, then manufacturing is easier and surface is more durable, but bone formation is inhibited
Solution Approach 1:
The implant surface is designed with a porous structure featuring voids of 30-300 microns width and 150 microns depth, with a fractal dimension of at least 3 microns. This porous architecture mimics pre-natal cancellous bone structure, providing osteoconductive pathways for bone ingrowth while maintaining manufacturing feasibility through additive fabrication processes.
Solution Approach 2:
The implant surface incorporates localized porous regions with specific geometric characteristics (void size 30-300 microns, depth 150 microns, fractal dimension ≥3 microns) that differ from the bulk material. This local quality enhancement promotes bone formation at the implant-bone interface while preserving the overall structural integrity and mechanical properties of the implant.
2Object-affected harmful factors
If porous structure is added to promote bone growth, then bone formation is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the porous structure: void width of 30-300 microns, void depth of 150 microns or less, and fractal dimension of at least 3 microns. These controlled parameters optimize bone formation while maintaining manufacturability through additive processes that can precisely replicate the required geometry without excessive complexity.
Solution Approach 2:
The implant surface mimics the natural architecture of pre-natal cancellous bone by replicating its fractal porous structure. This copying of biological architecture provides inherent osteoconductivity and promotes bone ingrowth without requiring complex additional features, as the bone-mimetic structure itself performs the bone formation enhancement function.
3Reliability
If fractal porous structure is implemented, then bone integration is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for the fractal porous structure: void width of 30-300 microns, void depth of 150 microns or less, and fractal dimension of at least 3 microns. These parameters are optimized to ensure reliable bone integration while remaining achievable through modern additive manufacturing technologies that can resolve these dimensional requirements.
Solution Approach 2:
The implementation of a controlled porous structure with fractal dimension ≥3 microns provides reliable bone integration by mimicking natural bone architecture. The porous structure facilitates bone cell infiltration and matrix deposition, ensuring robust bone-implant integration while the specific parameter ranges maintain compatibility with additive manufacturing precision capabilities.
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 implant device facilitates enhanced bone growth and integration by providing a surface that mimics pre-natal cancellous bone structure, promoting osteoblast attachment and bone matrix deposition, thereby improving the structural and functional integration of the implant with the surrounding bone.
Implementation Method 1
designed to enhance bone formation by replicating the porosity and architecture of cancellous bone
Implementation Method 2
promoting osteoblast attachment and bone matrix deposition, thereby improving the structural and functional integration of the implant with the surrounding bone
Data Source
Figure 1~2A
Figure 1A~1D
Figure 1E~1H
AI summary
An implant device for humans or mammals has a body structure having an exposed surface and one or more selected portions of the exposed surface having a bone formation enhancing 3-dimensional pattern. The exposed surface can be on exterior portions of the body structure or internal portions of the body structure or both. The one or more selected portions of the exposed portions having the bone formation enhancing 3-dimensional patterns are in the external exposed surfaces or in the internal exposed surfaces or both internal and external exposed surfaces.