Dual-Material Orthopedic Implant for Bone Ingrowth and Imaging
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Solution Overview
Problem
Existing orthopedic implants face challenges in achieving both structural strength and promoting bone growth due to the use of single materials like titanium, which have high elasticity and are radio-opaque, hindering post-operative examination.
Innovation Solution
A dual-material implant design combining a bony ingrowth material, such as β-tricalcium phosphate or hydroxyl apatite, with a radio-lucent support material like PEEK or PEEK-HA, forming a 3D matrix for porous regions and providing structural support, allowing for optimal bone integration and imaging visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If titanium metal is used to provide both porous section for bony ingrowth and solid section for structural strength, then structural strength is improved, but bone growth is inhibited due to high modulus of elasticity
Solution Approach 1:
The implant is divided into distinct functional regions: a porous section for bony ingrowth and a solid nonporous section for structural strength. This segmentation allows each region to be optimized for its specific function, with the porous section having high porosity (e.g., 70-90%) for bone integration and the solid section providing mechanical support.
Solution Approach 2:
Different sections of the implant are assigned different material properties and structures. The porous section uses materials with high porosity and lower density for bone growth, while the solid section uses denser materials for structural integrity. This local differentiation of material properties resolves the contradiction between bone growth and structural strength.
2Strength
If titanium metal is used to provide structural strength, then structural strength is improved, but post-operative examination is prevented due to high radio-opacity
Solution Approach 1:
The material properties are changed from highly radio-opaque titanium to radio-lucent materials such as PEEK (polyether ether ketone) or carbon fiber reinforced polymers. This parameter change in material radio-opacity allows post-operative imaging while maintaining structural strength through the design of the porous and solid sections.
3Ease of manufacture
If single material is used to form implant with porous and solid sections, then manufacturing simplicity is maintained, but optimization of both bone growth and structural strength is compromised
Solution Approach 1:
The implant combines multiple materials with complementary properties: radio-lucent materials (PEEK, carbon fiber) provide structural support while allowing imaging, and porous materials (beta-tricalcium phosphate, hydroxyl apatite) promote bone growth. This composite approach optimizes both functions while maintaining manufacturability through integrated design.
Data Source
AI summary
The present invention generally relates to an orthopedic implant. Specifically, the present invention relates to an implant that incorporates a purposefully designed material that optimizes bony ingrowth combined with a support material configured to provide structural integrity.