Implantable Organ Pouch with Protuberant Sheet for Cell Spacing
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Solution Overview
Problem
Existing implantable artificial organ pouches face challenges in ensuring the uniform distribution of active cells and mechanical resistance during and after implantation, leading to potential cell compression and impaired nutrient exchange.
Innovation Solution
A pouch with a semi-permeable membrane envelope containing a sheet with protuberances to maintain cell spacing, along with connectors for hydraulic communication and optional percutaneous chambers for easy renewal, ensuring cell durability and exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cells are contained in a semi-permeable membrane envelope, then nutrient exchange is enabled, but cell distribution uniformity deteriorates due to mass formation
Solution Approach 1:
The envelope is segmented into multiple compartments by inserting a sheet with protuberances that divide the internal space. This segmentation prevents cell mass formation while maintaining nutrient exchange through the semi-permeable membrane, resolving the contradiction between exchange efficiency and distribution uniformity.
Solution Approach 2:
The sheet with protuberances creates localized spaces between the sheet and envelope wall, providing uniform cell distribution in specific regions. This local structural modification ensures cells remain dispersed rather than forming masses, while the overall envelope maintains its semi-permeable properties for nutrient exchange.
2Reliability
If the envelope is made thin to ensure semi-permeability, then nutrient exchange is improved, but mechanical resistance deteriorates
Solution Approach 1:
The envelope is constructed as a composite structure combining a thin semi-permeable membrane layer with a reinforcing sheet made of elastomeric material. This composite design maintains the thinness necessary for semi-permeability while the elastomeric sheet provides mechanical strength and resistance, resolving the contradiction between permeability and strength.
3Ease of operation
If connectors are attached directly to the envelope, then hydraulic communication is enabled, but mechanical integrity deteriorates due to stress concentration
Solution Approach 1:
The sheet with protuberances serves as an intermediary element between the envelope and connectors. Connectors are attached to the sheet rather than directly to the envelope, distributing mechanical stresses through the sheet's structure while maintaining hydraulic communication pathways, thus preserving both ease of operation and mechanical integrity.
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 pouch ensures even distribution of cells, maintains mechanical integrity, and facilitates easy renewal of contents without compromising the semi-permeable envelope, enhancing the longevity and functionality of the artificial organ.
Implementation Method 1
The wall of the serpentine element is made of a material that enables exchanges of molecules of low molecular weight such as insulin and glucose, but that forms a barrier to larger molecules such as antibodies and antigens.
Implementation Method 2
the sheet comprising, at its surface, protuberances so as to maintain a space for cells between the sheet and the envelope
Implementation Method 3
a conduit connected to the connector so as to be in hydraulic communication with the inside of the pouch
Data Source
AI summary
A pouch for forming an implantable artificial organ, including a closed shell provided in a semi-pervious membrane. The pouch further includes a sheet contained within the shell, the sheet including projections on the surface thereof for maintaining a space for cells between the sheet and the shell.