Graded Porous Surgical Implants for Bone Ingrowth
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Solution Overview
Problem
Current surgical implants face challenges in promoting bone ingrowth while maintaining optimal mechanical properties and tissue anchoring capabilities, with existing scaffold structures often compromising between biological performance and mechanical strength.
Innovation Solution
A surgical implant with a porous structure featuring interconnected pores of varying sizes and porosities, created through an arrangement of fibres in stacked layers, allowing for controlled porosity gradients and enhanced bone ingrowth and vascularization, manufactured using additive manufacturing techniques such as 3D fibre deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the scaffold structure is made dense to improve mechanical properties, then mechanical strength is improved, but bone ingrowth properties deteriorate
Solution Approach 1:
The patent applies local quality by creating different porosity levels in different regions of the scaffold structure. The first region has a first porosity optimized for bone ingrowth, while the second region has a second porosity optimized for mechanical strength. This allows each region to have the specific properties needed for its function, resolving the contradiction between overall density and localized bone ingrowth capability.
2Reliability
If the scaffold structure is made more porous to improve biological performance, then bone ingrowth is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent divides the scaffold into regions with different porosity characteristics. The first region with higher porosity promotes biological performance and bone ingrowth, while the second region with lower porosity provides mechanical strength. This localized differentiation allows the scaffold to simultaneously achieve both biological and mechanical objectives without compromising either.
3Reliability
If the pore size is increased to promote bone ingrowth, then bone ingrowth rate is improved, but mechanical stability deteriorates
Solution Approach 1:
The patent implements different pore size characteristics in different regions. The first region contains larger pores that facilitate bone ingrowth and vascularization, while the second region contains smaller pores that provide mechanical stability and load-bearing capacity. This spatial differentiation of pore dimensions allows the scaffold to optimize both bone regeneration and structural integrity.
4Reliability
If the surface area for cell attachment is increased to improve tissue ingrowth, then tissue anchoring is improved, but device complexity increases
Solution Approach 1:
The patent segments the scaffold structure into multiple regions with different porosity and surface area characteristics. The first region provides high surface area for tissue anchoring and cell attachment, while the second region provides structural support. This segmentation allows the scaffold to achieve enhanced tissue anchoring without requiring the entire structure to be complex, as only the necessary regions are differentiated.
Data Source
AI summary
A surgical implant may include a porous structure with interconnected pores for ingrowth of bone into the porous structure. The porous structure has an arrangement of fibres which are attached to one another, the fibres being arranged in stacked layers. The porous structure has a surface including different regions having different porosities. A method of making the above surgical implant is also described.