Bi-layered Bone Regeneration Membrane for Space Maintenance
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Solution Overview
Problem
Current bone regeneration membranes face challenges such as insufficient stiffness for space maintenance, immunological rejection, variable biodegradation, and poor cell penetration due to their mechanical properties and material origins, limiting their effectiveness in guided bone tissue regeneration.
Innovation Solution
A bi-layered bone regeneration membrane comprising a dense resorbable polymer layer and a nanofibrillar layer with nanometer-sized fibers, where the dense layer prevents cellular migration and provides stiffness, while the nanofibrillar layer allows cell permeability and bone tissue regeneration with a porosity greater than 10 μm, ensuring effective space maintenance and bone formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collagen membranes are used for guided tissue regeneration, then barrier function and space maintenance are provided, but immunological rejection and disease transfer risks occur
Solution Approach 1:
The patent uses resorbable synthetic polymer membranes that temporarily perform the barrier function and then degrade safely in the body, eliminating the need for permanent implants and avoiding long-term immunological issues. The membrane serves its purpose during the critical healing period and then disappears without causing rejection.
Solution Approach 2:
The patent employs composite membrane structures combining different polymer materials with specific properties - some layers provide barrier function while others promote cell infiltration. This composite approach allows simultaneous achievement of space maintenance and controlled cell migration without immunological risks.
2Strength
If non-resorbable membranes are used, then space maintenance is improved, but exposure and need for second surgery occur
Solution Approach 1:
The patent uses resorbable membranes that are discarded by the body's natural metabolic processes after serving their temporary purpose. The membrane degrades into non-toxic products that are absorbed or excreted, eliminating the need for surgical removal and reducing patient burden.
Solution Approach 2:
The patent carefully controls the degradation parameters of the resorbable membrane - adjusting polymer composition, molecular weight, and crosslinking to ensure the membrane maintains mechanical strength throughout the critical healing period, then degrades at an appropriate rate. This parameter optimization resolves the contradiction between temporary strength and eventual resorption.
3Object-affected harmful factors
If resorbable membranes are used, then immunological rejection is avoided, but space maintenance capability decreases
Solution Approach 1:
The patent creates membranes with dynamic mechanical properties that adapt over time - initially providing strong space maintenance, then gradually softening and degrading as bone regeneration progresses. The membrane's mechanical properties are not static but evolve to match the healing process, maintaining strength when needed and allowing resorption when bone formation is sufficient.
Solution Approach 2:
The patent optimizes multiple parameters of resorbable polymers including crystallinity, molecular weight distribution, and degradation rate to achieve the desired balance. By carefully controlling these parameters, the membrane provides adequate mechanical support during early healing while ensuring complete resorption after bone regeneration is established.
4Reliability
If dense polymer layers are used, then barrier function is improved, but cell penetration is reduced
Solution Approach 1:
The patent uses multi-layer membrane structures where different layers perform different functions. One layer provides the dense barrier function to exclude unwanted tissues, while another layer provides porosity and surface features that promote desired cell migration. This segmentation of functions resolves the contradiction between barrier performance and cell infiltration.
Solution Approach 2:
The patent creates membranes with spatially varying properties - different regions of the membrane have different densities, porosities, and surface characteristics optimized for specific local functions. The barrier layer is dense where needed, while cell-contact layers are more porous and bioactive, allowing each region to perform its specialized function optimally.
Data Source
AI summary
A bone regeneration membrane comprising:a dense layer made of resorbable polymer, said dense layer having first and second opposite surfaces and being adapted to form a barrier to cells and soft tissues,a nanofibrillar layer made of resorbable polymer and attached to the first surface of the dense layer, said nanofibrillar layer comprising fibers having a diameter of nanometer size, said fibers being interlaced so as to present an average pore size greater than 10 μm to allow cell permeability and bone tissue regeneration, the nanofibrillar layer having a permeability κ between 0.4*10-9 m2 and 11*10-9 m2, preferably between 1*10-9 m2 and 4*10-9 m2, in particular substantially of 2*10-9 m2.