Fenestrated Orthopaedic Implant Shell for Bone Ingrowth Fixation
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Solution Overview
Problem
Conventional medical and dental implants face challenges with fixation stability over time due to inadequate bonding with host tissue, biomechanical disparities, and limited tissue ingrowth, leading to implant loosening and reduced longevity.
Innovation Solution
A musculo-skeletal implant with a fenestrated shell component and a biologic core that allows for seamless integration with host tissue, enhancing bone ingrowth and stability through a mesh-like structure that promotes tissue integration and loading of biologic materials like bone grafts and growth factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional implant surface bonding methods are used, then initial fixation stability is achieved, but fixation stability deteriorates over time due to implant loosening
Solution Approach 1:
The implant incorporates a porous outer surface structure that enables bone ingrowth into the implant surface. This porosity allows osteogenic cells to migrate into and through the porous layer, forming new bone that mechanically interlocks with the implant, thereby maintaining fixation stability over time and preventing implant loosening.
Solution Approach 2:
The implant utilizes a composite structure combining a metallic core with a porous coating layer. The metallic core provides structural strength and load-bearing capacity, while the porous outer layer facilitates biological integration through bone ingrowth. This composite design simultaneously achieves mechanical durability and biological compatibility for long-term fixation stability.
2Strength
If implant surface area for bone contact is increased, then mechanical fixation and anchoring strength are enhanced, but tissue integration remains limited
Solution Approach 1:
The porous outer surface provides both increased surface area for bone contact and interconnected void spaces that allow osteogenic cells to migrate into the implant structure. This enables true tissue integration rather than just surface bonding, as new bone forms within the porous network, creating a mechanically strong and biologically integrated fixation.
3Reliability
If cement or press-fit methods are used for joint implant fixation, then immediate fixation stability is achieved, but fixation is lost in months and years after implantation
Solution Approach 1:
The porous surface structure enables progressive bone ingrowth that strengthens fixation over time. Unlike cement or press-fit methods that provide only initial mechanical interlocking, the porous structure allows biological integration where new bone continuously reinforces the implant-bone interface, improving fixation durability for years after implantation.
Solution Approach 2:
The implant's porous structure enables self-reinforcing fixation through the body's own bone formation processes. As osteogenic cells populate the porous structure and deposit new bone, the fixation strength increases automatically without requiring additional surgical intervention or external support systems.
4Strength
If osteogenic proteins or growth factors are applied to enhance bone formation, then bone attachment strength is improved, but the solution remains limited to surface-level bonding
Solution Approach 1:
The porous structure provides a three-dimensional framework that extends beyond the surface, allowing osteogenic proteins and growth factors to be delivered throughout the implant-bone interface rather than just at the surface. This enables bone formation and attachment throughout the porous network, creating a more robust and less complex bonding interface compared to surface coating approaches.
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 fenestrated shell and biologic core combination provides superior fixation stability that improves over time, reducing stress shielding and bone atrophy, and enhances biological and biomechanical compatibility with host tissue, leading to improved implant performance and longevity.
Implementation Method 1
a mesh-tissue integration implantable device... enhanced biological and biomechanical function... allows for seamless integration with host tissue, enhancing bone ingrowth and stability
Data Source
AI summary
The present invention relates to orthopaedic implants having a fenestrated hollow shell and a biologic core. These design features provide an improved interface between the implant and the surrounding tissue, aiding fixation, and provide a vehicle for applying new bone healing and enhancing modalities, such as gene therapy, tissue engineering, and growth factors.