Flexible Meniscus Prosthesis for Load Distribution and Joint Adaptation
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Solution Overview
Problem
Existing meniscus prostheses struggle to replicate the anisotropic mechanical properties of the native meniscus, leading to discomfort and reduced durability due to high stress concentrations and limited adaptability to joint movements.
Innovation Solution
A meniscus prosthesis with a flexible, isotropic intermediate section made of a biocompatible material with a tensile modulus of up to 160 MPa, allowing for elastic deformation and improved adaptability, combined with stiffer ends for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the curved intermediate section is made of flexible material with low tensile modulus (at most 160 MPa), then the prosthesis can adapt to changing joint geometries through elastic deformation and distribute loads evenly, but the prosthesis may lack sufficient structural strength to withstand high circumferential stresses
Solution Approach 1:
The prosthesis combines a flexible curved intermediate section made of elastomeric material (tensile modulus at most 160 MPa) with stiffer end sections that have through-holes for bone fixation. This composite structure allows the intermediate section to provide flexibility and load distribution while the end sections provide anchoring strength, resolving the contradiction between adaptability and structural strength.
2Ease of manufacture
If the prosthesis is made of isotropic material with uniform tensile modulus, then manufacturing is simplified and the material can deform evenly in all directions, but the prosthesis cannot replicate the anisotropic mechanical properties of the native meniscus
Solution Approach 1:
The prosthesis employs local quality by making only the curved intermediate section from isotropic elastomeric material while the end sections are designed separately with through-holes for fixation. This allows the intermediate section to have uniform deformation characteristics for ease of manufacturing, while the overall prosthesis maintains functional reliability through the specialized end sections that provide secure bone anchoring.
3Stability of the object's composition
If the prosthesis uses a monolithic intermediate section made of single material, then the structure is simpler and more durable, but the prosthesis cannot provide differentiated mechanical properties in different regions
Solution Approach 1:
The prosthesis is segmented into a curved intermediate section and separate end sections. The intermediate section is made as a monolithic piece of elastomeric material with through-holes for fixation, providing structural integrity and simplicity. The end sections are designed separately to provide differentiated mechanical properties for bone anchoring, thus resolving the contradiction between structural stability and adaptability.
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
Enhances durability and comfort by evenly distributing loads, reducing the risk of impingement and dislocation, while maintaining joint function and lubrication.
Implementation Method 1
it may allow adaptation to the changing geometries of the joint surfaces during movement and/or loading of the joint by means of elastic deformation in the circumferential direction
Implementation Method 2
The meniscus is a C-shaped ring in the knee joint that shares the vertical load of the femoral condyle with the cartilage of the tibia
Data Source
Figure 1~2
Figure 3~5G
Figure 6~7
AI summary
An arc-shaped meniscus prosthesis comprises a first end (201) having a first fastening part (203) for securing the first end to a bone surface and a second end (202) having a second fastening part (204) for securing the second end to a bone surface. A curved intermediate section (203) connects the first end and the second end. The curved intermediate section is made of a single first biocompatible, non-resorbable material that has a tensile modulus of at most 160 MPa. The first material is isotropic with regard to the tensile modulus and the intermediate section is a monolithic piece of the first material.