Layered Osteochondral Scaffold for Cartilage and Bone Regeneration
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Solution Overview
Problem
Current surgical techniques for osteochondral defects, such as bone grafts and arthroplasty, are invasive, painful, and have limited efficacy, often leading to osteoarthritis, with existing regenerative therapies like autologous chondrocyte implantation causing site morbidity and fibrocartilage formation.
Innovation Solution
A biomaterial comprising a nanofibrous polymeric scaffold coated with multilayered droplets of polyanions and polycations, a hydrogel with stem cells, and a bone wound patch with a growth factor, designed to promote both subchondral bone and cartilage regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surgical techniques like bone graft or arthroplasty are used to treat osteochondral defects, then structural support is provided, but the procedure becomes invasive and painful with limited efficacy
Solution Approach 1:
The patent introduces a biomaterial scaffold as an intermediary carrier that delivers growth factors and stem cells to the injury site. This mediator promotes natural regeneration without requiring invasive surgical procedures like bone grafting or arthroplasty, thereby maintaining treatment efficacy while reducing surgical trauma and pain.
Solution Approach 2:
The biomaterial system enables self-service regeneration by providing growth factors (BMP-2, TGF-β3) and stem cells that activate the body's own regenerative capabilities. The treatment harnesses the patient's intrinsic healing mechanisms rather than requiring external surgical intervention, reducing invasiveness while promoting effective tissue repair.
2Reliability
If autologous chondrocyte implantation is used to promote cartilage regeneration, then cartilage repair is enhanced, but site morbidity and fibrocartilage formation occur
Solution Approach 1:
The patent changes the biochemical parameters of the regenerative environment by using specific growth factors (BMP-2 for bone, TGF-β3 for cartilage) and controlling the scaffold's physical-chemical properties. This precise parameter control guides stem cell differentiation toward hyaline cartilage rather than fibrocartilage, improving regeneration quality while reducing adverse outcomes.
Solution Approach 2:
The patent employs a composite biomaterial system combining polymer scaffold, growth factors, and stem cells. This multi-component composite approach synergistically promotes controlled differentiation and high-quality hyaline cartilage formation while minimizing fibrocartilage formation and site morbidity associated with simpler techniques.
3Reliability
If membrane-based collagen material with pre-cultured autologous chondrocytes is used to fill articular focal lesions, then cartilage regeneration is promoted, but subchondral bone shows site morbidity and fibrocartilage formation
Solution Approach 1:
The patent segments the treatment into distinct functional zones: the upper membrane layer delivers chondrogenic factors (TGF-β3) for cartilage regeneration, while the lower scaffold layer delivers osteogenic factors (BMP-2) for bone healing. This segmentation allows simultaneous optimization of both cartilage and bone repair, preventing the misfunctional repair and morbidity caused by uniform treatment approaches.
Solution Approach 2:
The patent applies local quality by providing different growth factors at different locations within the construct. The membrane layer specifically targets cartilage regeneration with TGF-β3, while the scaffold layer addresses subchondral bone with BMP-2. This localized differentiation ensures appropriate tissue formation in each zone, preventing fibrocartilage formation in bone and ensuring functional repair.
4Reliability
If multiple separate treatments are applied for cartilage and bone regeneration, then comprehensive coverage is achieved, but treatment complexity and procedural time increase
Solution Approach 1:
The patent merges cartilage regeneration (membrane with TGF-β3 and chondrocytes) and bone regeneration (scaffold with BMP-2) into a single integrated construct. This unified approach provides comprehensive osteoarticular regeneration in one procedure, eliminating the need for multiple separate treatments and reducing procedural complexity while maintaining comprehensive coverage.
Solution Approach 2:
The biomaterial construct serves multiple functions simultaneously: it acts as a structural scaffold, a drug delivery system for multiple growth factors, a cell carrier, and a barrier membrane. This multi-functionality allows comprehensive treatment of both cartilage and bone defects through a single versatile device, reducing the need for multiple separate procedures.
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 biomaterial enhances tissue regeneration by providing a controlled release of growth factors and improving cell adherence, reducing inflammation and promoting functional recovery of the articulation, with potential to prevent osteoarthritis.
Implementation Method 1
a nanofibrous polymeric scaffold coated with multilayered droplets of polyanions and polycations
Implementation Method 2
coated with multilayered droplets of polyanions and polycations
Implementation Method 3
a hydrogel with stem cells
Implementation Method 4
designed to promote both subchondral bone and cartilage regeneration
Data Source
AI summary
The present invention relates to a biomaterial comprising: —a membrane wound patch (a), made of a nanofibrous polymeric scaffold, —a hydrogel (b) including autologous or allogenic bone marrow-derived mesenchymal stem cells, and —a bone wound patch (c) being a nanofibrous scaffold made of polymers, wherein said scaffold has a surface coated with an interrupted coating made of multilayered droplets, said multilayered droplets being droplets composed of at least one layer pair consisting of a layer of polyanions and a layer of polycations, and wherein the bone wound patch (c) further comprises a bone growth factor; wherein the hydrogel (b) is included between the membrane wound patch (a) and the bone wound patch (c).