Bone Grafts with Stem Cell-Derived ECM and Synthetic Scaffolds
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Solution Overview
Problem
Current bone grafts face limitations in being osteogenic, osteoinductive, and osteoconductive without the drawbacks of autografts, such as limited availability and donor site morbidity, and existing products lack the combination of mechanical properties and native tissue cues for effective bone healing.
Innovation Solution
Development of bone grafts and constructs containing osteogenic stem cells on a scaffold, combined with osteoinductive demineralized bone and osteoconductive cortico-cancellous chips, and ECM on synthetic scaffolds to promote bone healing, where stem cells are instructed to secrete extracellular matrix, enhancing cell differentiation and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autografts are used to provide osteogenic cells for bone healing, then bone regeneration capability is improved, but donor site morbidity and limited availability occur
Solution Approach 1:
The patent extracts the beneficial osteogenic cells from the autograft source and separates them from the harmful donor site morbidity. By isolating stem cells from adipose tissue or bone marrow and seeding them on synthetic scaffolds, the invention obtains the bone regeneration capability without requiring harvest from donor sites, thus eliminating donor site morbidity while maintaining osteogenic function
Solution Approach 2:
The patent creates a universal bone graft product that can be used for various bone defects without being limited by donor site availability. The synthetic scaffold seeded with osteogenic cells can be applied to different anatomical locations and defect types, providing a multi-functional solution that overcomes the limited availability of autografts while maintaining reliable bone regeneration
2Strength
If synthetic scaffolds are used to provide structural support, then mechanical properties are improved, but lack of native tissue cues for cell behavior occurs
Solution Approach 1:
The patent merges the advantages of synthetic scaffolds (mechanical strength, structural support) with natural extracellular matrix components (native tissue cues, cell signaling). The ECM is integrated onto the synthetic scaffold surface, creating a composite structure that provides both the mechanical properties needed for structural support and the biochemical cues necessary for guiding cell behavior, differentiation, and tissue regeneration
Solution Approach 2:
The patent employs composite material construction by combining synthetic scaffold materials with natural extracellular matrix components. This composite approach allows the bone graft to exhibit both the mechanical strength of synthetic materials and the biological activity of natural tissue matrices, enabling simultaneous provision of structural support and cell behavior guidance
3Reliability
If demineralized bone matrix is used to provide osteoinductive properties, then bone formation is improved, but structural strength is reduced
Solution Approach 1:
The patent applies local quality by concentrating osteoinductive demineralized bone matrix components at specific locations where bone formation is needed, while the synthetic scaffold provides the overall structural strength. The DBM is applied locally to the scaffold surface or at the defect site, providing osteoinductive properties precisely where required without compromising the global structural integrity provided by the synthetic framework
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 solution provides bone grafts and constructs that are osteogenic, osteoinductive, and osteoconductive, offering improved bone healing by combining the benefits of stem cells, demineralized bone, and cortico-cancellous chips with synthetic scaffolds, enhancing mechanical properties and guiding cell behavior for effective tissue regeneration.
Implementation Method 1
The stem cells are then instructed using chemical cues to undergo osteogenic differentiation. This causes the MSCs to secret extracellular matrix (ECM).
Implementation Method 2
A decellularized tissue matrix provides a complex ECM-based scaffold, similar to native tissue. Having the ECM on a suitable synthetic scaffold provides better mechanical properties in addition to providing the cues similar to that of native tissue.
Implementation Method 3
The stem cells are then instructed using chemical cues to undergo osteogenic differentiation.
Data Source
AI summary
Bone grafts and constructs including stem cells are provided. Example bone grafts include osteogenic stem cells seeded on a scaffold of osteoconductive cortico-cancellous chips and/or osteoinductive demineralized bone. Example constructs include extracellular matrix on a synthetic scaffold, in which the ECM is secreted from MSCs seeded onto the synthetic scaffold. Also provided are methods of making the present bone grafts and scaffolds. Further provided are methods of promoting bone healing and treating wound healing, by administering the present bone grafts and constructs to a mammal in need thereof. Also provided are kits that include the present bone grafts and/or constructs, or components thereof.