Boron-Dye Polymer Nanofiber Scaffolds for Oxygen Monitoring
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Solution Overview
Problem
There is a need for effective monitoring of oxygen levels in tissue scaffolds and transplants, as sustained low oxygen tensions can impair the regenerative capacity and survival of tissue-engineered grafts, and existing oxygen sensing technologies are limited by longevity and dynamic precision.
Innovation Solution
A multiple layered scaffold comprising boron-dye polymer nanofibers for sensing oxygen levels, where the boron dye is conjugated to a polymer and electrospun into nanofibers, providing a dual emissive oxygen sensor with phosphorescence and fluorescence signals for ratiometric detection, and is combined with a structural support layer for enhanced strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a boron-dye polymer nanofiber scaffold is used for oxygen sensing, then measurement precision of oxygen levels is improved, but strength and structural stability of the scaffold deteriorate
Solution Approach 1:
The patent combines a boron-dye polymer nanofiber layer (providing oxygen sensing capability) with a separate structural support layer of polymer nanofibers. This merging of sensing and structural functions into a composite scaffold system resolves the contradiction by allowing the boron-dye layer to provide precise oxygen measurement while the structural layer maintains mechanical strength and stability.
Solution Approach 2:
The scaffold is constructed as a composite material system with at least two distinct layers: a boron-dye polymer nanofiber layer for oxygen sensing and a structural support layer for mechanical integrity. This composite structure enables simultaneous achievement of measurement precision and structural strength that neither material could provide alone.
2Measurement precision
If a blended dye and polymer formulation is electrospun into nanofibers, then sensing capability is improved, but signal stability in aqueous media deteriorates
Solution Approach 1:
The patent extracts the boron-dye sensing formulation into a separate, dedicated nanofiber layer rather than blending it uniformly with structural polymers. This separation allows the boron-dye nanofibers to maintain their phosphorescence signal stability in aqueous media while providing sufficient sensing capability, resolving the contradiction between signal detection and compositional stability.
3Reliability
If multiple layers are combined to form a scaffold, then reliability of oxygen monitoring is improved, but device complexity increases
Solution Approach 1:
The patent segments the scaffold into functionally distinct layers: a boron-dye polymer nanofiber layer for oxygen sensing and a structural support layer for mechanical integrity. This segmentation improves reliability by dedicating specific layers to specific functions, while the modular nature of the segmented structure actually simplifies the overall device architecture compared to a fully integrated homogeneous scaffold.
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 real-time, non-invasive monitoring of oxygen gradients in tissues, providing stable and accurate measurements over extended periods, improving the success and integration of tissue-engineered grafts and islet transplants by ensuring optimal oxygen conditions.
Implementation Method 1
The boron dye is conjugated to a polymer and electrospun into nanofibers, providing a dual emissive oxygen sensor with phosphorescence and fluorescence signals
Implementation Method 2
The boron dye is conjugated to a polymer and electrospun into nanofibers, providing a dual emissive oxygen sensor with phosphorescence and fluorescence signals
Implementation Method 3
The boron dye is conjugated to a polymer and electrospun into nanofibers
Data Source
AI summary
To address the need for scaffold-based oxygen concentration monitoring, a single-component, self-referenced oxygen sensor was made into nanofibers. Electrospinning process parameters were tuned to produce a biomaterial scaffold with specific morphological features. The ratio of an oxygen sensitive phosphorescence signal to an oxygen insensitive fluorescence signal was calculated at each image pixel to determine an oxygenation value. A single component boron dye-polymer conjugate was chosen for additional investigation due to improved resistance to degradation in aqueous media compared to a dye polymer blend. Standardization curves show that in fully supplemented media, the fibers are responsive to dissolved oxygen concentrations less than 15 parts per million. Spatial and temporal ratiometric gradients were observed in vitro radiating outward from the center of a dense adherent cell grouping. Sensor activation in ischemia and cell transplant models in vivo show oxygenation decreases on the scale of minutes.