Injectable Microfiber Scaffold for Minimally Invasive Tissue Repair
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Solution Overview
Problem
Current treatments for soft tissue injuries and degeneration, such as Intervertebral Disk Degeneration (IVD) and osteoarthritis, lack effective methods for repairing tissue integrity and preventing further deterioration, with existing techniques like suturing, stem cell injections, and autologous Chondrocyte Implantation (ACI) showing limited clinical advantages and requiring invasive surgeries.
Innovation Solution
An injectable scaffold comprising unclad microfibers and a diluent solution, where microfibers are formed through a stretch-and-fold method, unclad, hydrated, and seeded with cells before being injected into tissue defects, allowing for minimally invasive repair and crosslinking to form a solid scaffold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surgical interventions like suturing and annuloplasty are used to repair soft tissue, then tissue integrity can be restored, but the procedures are invasive and fail to improve annular strength
Solution Approach 1:
The invention uses microfibers as segmented building blocks that can be individually injected and assembled in situ to form a repaired tissue structure, avoiding the need for invasive surgical suturing while restoring tissue strength through distributed fiber reinforcement
Solution Approach 2:
The microfiber scaffold acts as an intermediary material that bridges the defect area and provides a framework for tissue regeneration, allowing strength restoration without direct surgical intervention on the tissue itself
2Reliability
If stem cells are injected into the nucleus pulposus to treat degenerative IVD, then cell therapy is provided, but annular strength is not improved
Solution Approach 1:
The invention combines microfibers with stem cells to create a composite scaffold structure where the fibrous framework provides mechanical strength while the embedded cells provide regenerative capability, achieving both strength improvement and tissue regeneration simultaneously
3Ease of manufacture
If microfracture procedure is performed to allow stem cells to enter cartilage defect, then cartilage repair is initiated, but cartilage scar forms that is not as resilient as native hyaline cartilage
Solution Approach 1:
The microfiber scaffold is prepared in advance with appropriate architecture and mechanical properties before injection, providing a pre-formed framework that guides proper cartilage regeneration and prevents scar tissue formation from the outset
Solution Approach 2:
The invention changes the physical and chemical parameters of the repair environment by providing a controlled microfiber scaffold with specific pore sizes, stiffness, and surface properties that promote hyaline cartilage differentiation rather than fibrocartilage scar formation
4Strength
If Autologous Chondrocyte Implantation is performed to fill cartilage defects with expanded chondrocytes, then healing tissue more like native hyaline cartilage is achieved, but the procedure requires invasive surgery and two stages
Solution Approach 1:
The invention merges the cell preparation and scaffold implantation into a single injectable procedure, combining the benefits of ACI (high-quality hyaline cartilage regeneration) with the simplicity of a minimally invasive single-stage operation
5Ease of operation
If injectable microfiber scaffold is used for tissue repair, then minimally invasive repair is achieved, but the scaffold must be crosslinking to form solid structure
Solution Approach 1:
The microfiber scaffold utilizes phase transition of the crosslinking agent (from liquid to solid or from active to inactive state) to transform the injectable suspension into a solid, load-bearing structure after injection, enabling minimally invasive delivery followed by in situ structure formation
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 scaffold enables effective tissue repair by promoting chondrogenesis, enhancing cartilage matrix deposition, and improving mechanical properties, with the ability to integrate with surrounding tissue, offering a less invasive and more effective alternative to existing methods.
Implementation Method 1
dissolving the cladding from the chips by contacting the chips with the uncladding solution to unclad the microfibers
Implementation Method 2
hydrating the uncladded microfibers with a hydrating solution, thereby forming a paste
Implementation Method 3
crosslinking to form a solid scaffold
Data Source
AI summary
The present invention provides an injectable scaffold comprising a plurality of unclad microfibers, and a diluent solution.