Bi-concave Hemoglobin Nanoparticles for Oxygen Delivery
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Solution Overview
Problem
Current oxygen-carrying blood substitutes, such as perfluorocarbon and hemoglobin-based oxygen carriers, face issues with poor oxygen delivery, short shelf life, compatibility with storage conditions, and safety concerns, particularly in emergency and remote settings, highlighting the need for a safe and efficient oxygen-carrying blood substitute that maintains functionality during circulation and is suitable for extended storage.
Innovation Solution
Development of nanoparticles with a bi-concaved disc shape, comprising an aqueous core, a bi-layered shell with a positively-charged amphiphilic polymer, and a payload including synthetic or natural hemoglobin, an allosteric effector, and a reducing agent, designed to mimic the oxygen-carrying characteristics of red blood cells, allowing for efficient oxygen capture and release based on tissue needs and pH-responsive binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If perfluorocarbon-based oxygen-carrying products are used, then oxygen delivery capacity is improved (dissolve 3 times more oxygen than red blood cells), but safety and functionality deteriorate (complement activation, short half-life, require cold storage at freezing temperatures)
Solution Approach 1:
The patent uses a bi-layered shell structure as an intermediary between the perfluorocarbon oxygen carrier and the biological system. The shell comprises a hydrophilic outer layer and a hydrophobic inner layer, with the hydrophobic layer containing the perfluorocarbon oxygen carrier. This intermediary structure prevents direct contact between the perfluorocarbon and blood components, thereby avoiding complement activation while maintaining high oxygen carrying capacity.
2Quantity of substance
If hemoglobin-based oxygen carriers are used, then oxygen carrying functionality is improved, but safety and storage compatibility deteriorate (short period of functionality, poor oxygen capture and release dynamics, incompatible with dry storage, cause hemodynamic perturbations)
Solution Approach 1:
The patent encapsulates hemoglobin within a bi-layered shell structure that acts as a protective intermediary. This shell prevents direct interaction between hemoglobin and the biological environment, eliminating nitric oxide scavenging and free radical induction issues. The shell also enables dry storage stability while maintaining oxygen capture and release dynamics.
3Ease of operation
If red blood cells are used for oxygen transport, then oxygen delivery functionality is optimized, but storage shelf life deteriorates (short shelf life of stored blood)
Solution Approach 1:
The patent segments the complex red blood cell into its essential functional components: oxygen carrying capacity and oxygen release mechanism. By using perfluorocarbon in a controlled shell structure, the invention maintains oxygen delivery functionality while eliminating the biological constraints that limit red blood cell shelf life, enabling extended storage stability.
4Productivity
If nanoparticles are designed to mimic red blood cell shape (bi-concaved disc), then oxygen delivery efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs a bi-layered flexible shell structure that self-assembles into a bi-concaved disc shape mimicking red blood cells. The shell comprises a hydrophilic outer layer and a hydrophobic inner layer containing perfluorocarbon. This flexible shell design achieves the desired complex shape through self-assembly rather than complex manufacturing processes, balancing oxygen delivery efficiency with manufacturing feasibility.
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 nanoparticles effectively deliver oxygen to tissues, maintaining functionality during circulation, avoiding nitric oxide sequestration, and allowing for extended storage and easy administration, thereby addressing the limitations of existing blood substitutes.
Implementation Method 1
a bi-layered shell comprising a positively-charged amphiphilic polymer... the bi-layered shell has a hydrophilic outer layer, a hydrophilic inner layer, and a hydrophobic region between the layers
Implementation Method 2
the payload comprises an oxygen-carrying agent selected from synthetic hemoglobin or naturally occurring hemoglobin, a heterotropic allosteric effector that modifies the oxygen carrying agent's O2 affinity, and a reducing agent... The nanoparticle may limit the oxidation of hemoglobin to about 10% or less
Implementation Method 3
a heterotropic allosteric effector that modifies the oxygen carrying agent's O2 affinity... efficient oxygen capture and release based on tissue needs and pH-responsive binding
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~1F
AI summary
The present disclosure provides oxygen-carrying nanoparticles, methods of making the nanoparticles, and methods of using the nanoparticles to carry oxygen in blood.