Supramolecular Polymer Putty for Spinal Fusion Bone Regeneration
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Solution Overview
Problem
Current spinal fusion methods face challenges with iliac crest autograft bone's limited availability and high-cost alternatives like BMP-2, which have safety concerns and restricted use, necessitating a more effective and safer synthetic option for bone/tissue repair and regeneration.
Innovation Solution
Compositions comprising peptide amphiphile nanofibers, soft covalent polymers, and ceramic materials, such as PEG and hydroxyapatite, are developed to create a composite putty-like material that promotes bone/tissue repair and regeneration, potentially incorporating bioactive factors like BMP-2 for enhanced osteogenesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BMP-2 is used for spinal fusion, then fusion results are consistent and reliable, but safety concerns arise due to supraphysiological doses and manufacturing costs become prohibitive
Solution Approach 1:
The patent introduces an intermediary system consisting of peptide amphiphile nanofibers that bind and deliver BMP-2 in a controlled manner. The nanofiber structure acts as a mediator between the BMP-2 protein and the bone tissue, enabling physiological dosing by improving delivery efficiency and reducing the need for supraphysiological amounts of BMP-2.
Solution Approach 2:
The patent changes the delivery parameters of BMP-2 by incorporating it into a composite putty material with specific mechanical properties (storage modulus 100-5000 Pa). This allows control over the release kinetics and local concentration of BMP-2, enabling physiological dosing while maintaining effective fusion outcomes.
2Reliability
If BMP-2 is used for spinal fusion, then fusion outcomes are consistent, but manufacturing costs become prohibitive for adoption
Solution Approach 1:
The patent employs a disposable composite putty material that combines inexpensive ceramic particles (hydroxyapatite, tricalcium phosphate) with peptide amphiphile nanofibers. This approach replaces expensive recombinant BMP-2 products with a cost-effective composite material that can be manufactured at scale and disposed of after single use, eliminating the need for expensive protein manufacturing and purification processes.
3Ease of manufacture
If iliac crest autograft bone is used for spinal fusion, then cost is low and fusion results are reliable, but harvest site morbidity and limited volume occur
Solution Approach 1:
The patent extracts the essential osteogenic function from the iliac crest autograft (which provides both structural support and biological activity) and separates it into two components: a synthetic structural scaffold (composite putty with ceramic particles and polymer matrix) and a biological activator (BMP-2 delivered via peptide nanofibers). This eliminates the need for harvest site surgery while maintaining the dual functions of structure and biology.
Solution Approach 2:
The patent creates a composite material combining synthetic polymers (for structural support and mechanical properties), ceramic particles (for osteoconductivity and bone integration), and peptide amphiphile nanofibers (for targeted BMP-2 delivery). This composite approach replicates the multifunctionality of autograft bone without requiring harvest site surgery.
4Adaptability or versatility
If a synthetic bone graft material is used, then availability is improved, but biological activity and osteogenesis capability are reduced
Solution Approach 1:
The patent introduces peptide amphiphile nanofibers as an intermediary that bridges the gap between synthetic materials and biological activity. These nanofibers provide a biomimetic interface that specifically binds BMP-2 and delivers it to bone progenitor cells, conferring osteogenic capability to the synthetic composite material while maintaining broad availability and ease of manufacture.
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 composite material effectively supports bone/tissue repair and regeneration, offering a safer and more reliable alternative to existing methods by enhancing spinal fusion rates and reducing the need for high-dose BMP-2, while being cost-effective.
Implementation Method 1
peptide amphiphile nanofibers comprise a supramolecular assembly of peptide amphiphiles
Implementation Method 2
peptide amphiphiles comprising: (i) a hydrophobic non-peptidic segment; (ii) a structural peptide segment; and (iii) a charged segment
Implementation Method 3
the polymer component comprises polyethylene glycol (PEG)
Implementation Method 4
the ceramic component comprises hydroxyapatite (HA), tricalcium phosphate (TCP), bioglass, calcium sulfate
Implementation Method 5
the bioactive peptide segment mimics the biological function of or is capable of binding to a bioactive factor and/or cellular component
Data Source
AI summary
Spinal fusion is a surgical procedure to treat debilitating back and neck pain where two adjacent spinal vertebrae are fused by inducing bone growth between them. While iliac crest autograft bone has been the gold standard for spinal fusions due to its low cost and reliable fusion results, harvest site morbidity and limited volume have led to a search for alternatives. Provided herein are compositions comprising peptide amphiphiles, soft covalent polymers, and ceramic materials. Composite putty-like materials are provided for medical uses, in particular for the repair of bone/tissue injuries/defects and the regeneration of bone or other tissue.