Dual Porosity Bone Composition for Implant Stability
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Solution Overview
Problem
Current endoprosthetic implantation methods often result in a poor fit between the prosthesis and surrounding bone tissue, leading to instability, mechanical wear, and osteoclastic resorption, which shortens the implant's lifespan and complicates subsequent surgeries, especially in younger patients where longer implant longevity is desired.
Innovation Solution
A composition comprising a bone endogenous material and a degradable polymer with dual mode porosity, applied as a compliant barrier layer to promote osteoconduction and bone growth, enhancing the stability and longevity of orthopaedic implants by facilitating molecular transport and cellular migration without the need for cement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an interference fit method is used for endoprosthetic implantation, then the implant can be inserted into the medullary canal, but a poor fit between the prosthesis and surrounding bone tissue results, leading to micromotion and instability
Solution Approach 1:
The patent employs a porous composition material that is applied to the medullary canal wall to create an osteoconductive scaffold. This porous structure allows bone ingrowth and integration with the implant, transforming the poor interference fit into a stable biological attachment. The porous material bridges the gap between the prosthesis and bone tissue, eliminating micromotion while maintaining ease of implantation.
Solution Approach 2:
The invention uses a composite composition comprising bone endogenous material and degradable polymer material. This composite provides both structural support and biological functionality, allowing the implant to achieve stable fixation through combined mechanical and biological mechanisms rather than relying solely on interference fit.
2Duration of action of moving object
If the implant is allowed to move back and forth from cyclic loading, then micromotion occurs at the interface, but this results in mechanical wear and osteoclastic resorption of surrounding bone tissue
Solution Approach 1:
The porous composition acts as an intermediary layer between the implant and the bone tissue. This intermediate material absorbs and distributes mechanical loads, preventing direct micromotion and wear at the bone-implant interface. It also serves as a protective barrier that prevents osteoclastic resorption by providing a stable osteoconductive environment that promotes bone formation rather than degradation.
Solution Approach 2:
The patent changes the physical and chemical parameters of the interface environment by applying a composition with specific porosity, degradation rate, and osteoconductive properties. This transforms the harmful micromotion environment into a beneficial one that promotes bone healing and integration, thereby extending implant lifespan while eliminating wear and resorption.
3Ease of manufacture
If traditional endoprosthetic implantation is performed without bone growth promotion, then the procedure is simpler, but the implant useful life is limited to 10-15 years especially in younger patients
Solution Approach 1:
The patent applies a bone growth-promoting composition to the medullary canal wall before implant insertion. This preliminary action prepares the biological environment to facilitate rapid bone ingrowth and integration with the implant. The composition is applied in a simple manner that does not complicate the surgical procedure, yet it dramatically extends implant lifespan by promoting active bone formation and integration.
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 composition creates a stable interface between the implant and bone, reducing osteoclastic resorption, promoting bone synthesis, and extending the lifespan of endoprosthetic implants by integrating them seamlessly with the surrounding bone tissue, thereby minimizing micromotion and mechanical wear.
Implementation Method 1
The degradable polymer material has a half-life for degradation of 1-30 days
Implementation Method 2
the composition undergoes a phase transformation from the flow phase to a congealed phase
Implementation Method 3
providing a dual mode porosity system in the composition in its congealed phase, wherein the congealed phase of the composition has a first order porosity and a second order porosity
Data Source
AI summary
A composition and method for inducing bone growth and healing is provided. The composition is useful for promoting new bone synthesis, and to enhance the mechanical stability and longevity of orthopaedic implants. The composition includes a bone endogenous material which is used as raw material for the body's natural osteogenic mechanism to synthesize new bone. The composition is applied in a flow phase and then undergoes a phase change to a congealed phase. The resulting material has a dual mode porosity system, having a first order porosity to accommodate and promote convective diffusion of nutrient species into and through the material, and a second order porosity to accommodate osteoblastic migration therein without the need for osteoclastic resorption.