Tubular Cell Encapsulation Structure for Dual-Sided Vascularization
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Solution Overview
Problem
Existing cell encapsulation devices face challenges in ensuring adequate oxygen and nutrient supply to cells, leading to cell death due to insufficient vascularization, as vascularization typically occurs only from the outer perimeter, limiting cell survival and growth.
Innovation Solution
The development of a therapeutic device with a tubular or toroidal configuration featuring a permeable composite layer and a permeable composite layer, allowing vascularization from both the lumen and exterior, and a reservoir with a thickness of 50-200 microns to facilitate nutrient and oxygen delivery to cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cells are encapsulated in a device with a core structure, then the device maintains structural integrity, but vascularization can only occur from the outer perimeter, limiting cell survival
Solution Approach 1:
The device is divided into multiple segments including an inner core, intermediate layer, and outer shell, each with specific permeability characteristics. This segmentation allows different regions to perform specialized functions while maintaining overall structural integrity and enabling multiple vascularization pathways.
Solution Approach 2:
The invention transitions from single-sided vascularization (outer perimeter only) to multi-dimensional vascularization by creating pathways from both the outer shell and the lumen. This dimensional change in nutrient delivery approaches fundamentally improves cell survival throughout the encapsulated volume.
2Reliability
If the distance between cells and oxygen supply is reduced, then cell survival improves, but the device structure becomes more complex
Solution Approach 1:
The device is divided into multiple segments including an inner core, intermediate layer, and outer shell, each with specific permeability characteristics. This segmentation allows different regions to perform specialized functions while maintaining overall structural integrity and enabling multiple vascularization pathways.
Solution Approach 2:
The intermediate layer acts as a mediator between the inner core and outer shell, providing structural support while allowing nutrient and oxygen transport. This intermediary structure enables complex functionality without requiring direct contact between all components.
3Reliability
If a reservoir with thickness of 50-200 microns is used, then nutrient and oxygen delivery to cells is facilitated, but the device requires multiple permeable layers increasing manufacturing complexity
Solution Approach 1:
The device employs porous materials in both the inner core and outer shell that allow nutrient and oxygen permeation. These porous structures naturally facilitate diffusion of nutrients through the reservoir thickness while maintaining structural integrity, reducing the need for additional complex manufacturing steps.
Solution Approach 2:
The invention uses composite material structures combining different permeability characteristics in the inner core, intermediate layer, and outer shell. This composite approach enables optimized nutrient delivery through the 50-200 micron reservoir while integrating multiple functions into a unified manufacturing process.
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
Enhances cell survival and growth by minimizing the distance between cells and nutrient sources through dual vascularization pathways, enabling efficient nutrient and oxygen supply, thereby supporting cell proliferation and therapeutic function.
Implementation Method 1
The first composite layer includes a first cell permeable layer and a first cell impermeable layer and the second composite layer includes a second cell permeable layer and a second cell impermeable layer... allowing vascularization from both the lumen and exterior
Data Source
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AI summary
A therapeutic device includes a tubular body including a lumen extending therethrough, a wall of the tubular body including a first composite layer, a second composite layer; and a reservoir between the first and second composite layers, the reservoir being configured to receive and contain a biological moiety. In another embodiment, a therapeutic device includes a toroidal therapeutic device having a first opening therein and a hollow interior, the toroidal therapeutic device having a wall including a first permeable composite layer, a second permeable composite layer, and a reservoir between the first and second composite layers, the reservoir being configured to receive and contain a biological moiety.