SONIC Scaffold Tracheal Micro-channels Oxygen Diffusion
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Solution Overview
Problem
Cell encapsulation therapies, such as those for type 1 diabetes, face significant challenges due to inadequate oxygenation of encapsulated cells, which limits their functionality and requires complex oxygen supply systems or large device sizes, constraining the thickness of hydrogel-based encapsulation matrices.
Innovation Solution
The development of a scaffold with a tracheal-like internal system of continuous air-filled, hydrophobic micro-channels, known as the Speedy Oxygenation Network for Islet Constructs (SONIC), which enhances oxygen diffusion by mimicking the insect tracheal system, allowing for deeper cell penetration and thicker device geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hydrogel-based encapsulation matrices are used, then cell protection and immune isolation are achieved, but oxygen diffusion is insufficient limiting device thickness and cell functionality
Solution Approach 1:
The invention combines hydrogel material with porous foam material to create a composite encapsulation matrix. The hydrogel provides cell protection and immune isolation, while the porous foam structure introduces air-filled channels that enhance oxygen diffusion throughout the device, resolving the contradiction between maintaining device thickness and ensuring adequate oxygenation for cell functionality.
Solution Approach 2:
The invention incorporates porous foam material with interconnected air-filled channels into the encapsulation matrix. This porous structure enables efficient oxygen transport from the external environment to encapsulated cells throughout the device thickness, allowing thicker device geometries while maintaining adequate oxygenation and cell functionality.
2Volume of stationary object
If device thickness is increased to reduce device size requirements, then oxygen diffusion becomes insufficient, limiting cell viability in thicker regions
Solution Approach 1:
The invention segments the encapsulation matrix into hydrogel regions containing cells and porous foam regions containing air-filled channels. This segmentation creates a distributed oxygen delivery network throughout the device volume, ensuring that cells throughout the entire device thickness have access to adequate oxygen, thereby maintaining cell viability while allowing increased device volume.
3Reliability
If complex oxygen supply systems are implemented to improve oxygenation, then cell functionality is maintained, but device complexity increases
Solution Approach 1:
The porous foam material inherently provides oxygen diffusion pathways through its air-filled porous structure. This self-service mechanism eliminates the need for complex active oxygen supply systems such as pumps, reservoirs, or controlled release mechanisms. Oxygen diffuses passively through the porous channels from the external environment, maintaining cell functionality while keeping the device simple.
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 SONIC scaffold significantly improves oxygen delivery to encapsulated cells, maintaining high viability and function even in thick devices, enabling longer-term functionality and reduced device size requirements, as demonstrated by successful islet transplantation in diabetic mice.
Implementation Method 1
O2 transport in hydrogels is invariably dependent on its permeability, the product of the solubility and diffusivity coefficients
Implementation Method 2
a scaffold with a tracheal-like internal system of continuous air-filled, hydrophobic micro-channels
Data Source
AI summary
Disclosure herein are an implantable cell containing device, its subcomponent scaffold, methods of making the same and their methods of use. The implantable cell containing device includes a scaffold and a cell-containing hydrogel encapsulating the scaffold. The scaffold has a tracheal-like internal system of continuous air-filled, hydrophobic micro-channels that traverse the scaffold's dimensions and a hydrophilic external surface. The implantable cell containing device, when implanted in a subject, can be used for delivering a therapeutic agent to a subject in need thereof for the treatment of various conditions and diseases.