Decompression Layer Stiffness Gradient for Tissue Lifting
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Solution Overview
Problem
Current methods for treating swelling associated with trauma or pathologies like lymphedema are not durable, reusable, or efficient in providing decompression therapy to increase blood perfusion and lymphatic flow, which can impede healing and recovery.
Innovation Solution
A decompression therapy system comprising an occlusive layer sealed around a tissue site to create an air-tight chamber, a compressible decompression layer with channels, and a vacuum source connection, where the decompression layer collapses away from the tissue site to enhance blood and lymph flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a decompression layer is designed to collapse towards the tissue site under vacuum, then the structure is simpler and more intuitive, but the lifting force applied to the tissue is reduced and blood perfusion is less effective
Solution Approach 1:
The decompression layer is designed to collapse in the opposite direction from what would be intuitively expected. Instead of collapsing toward the tissue site, the layer collapses away from the tissue, with its center of stiffness positioned closer to the outer surface than the inner surface. This inverted collapse direction creates a lifting force that pulls the tissue upward, enhancing blood perfusion and resolving the contradiction between structural simplicity and effective force application.
2Reliability
If a reusable treatment system is designed to be durable and washable, then it can be sterilized between uses, but the materials and construction become more complex and costly
Solution Approach 1:
The treatment system is divided into separate functional layers: an occlusive layer, a decompression layer with channels, and an interface layer. Each layer can be independently constructed from materials suitable for its specific function, allowing the overall system to achieve reusability and sterilization capability without requiring every component to be overly complex. The modular structure enables selective material selection that balances durability with construction simplicity.
3Force
If the decompression layer has uniform stiffness throughout, then the structure is simpler to manufacture, but the lifting force distribution across the tissue site is non-optimal
Solution Approach 1:
The decompression layer incorporates a non-uniform stiffness distribution, with the center of stiffness deliberately positioned closer to the outer surface than the inner surface. This local variation in stiffness properties allows the layer to collapse in a controlled manner that optimizes lifting force distribution across the tissue site. The gradient stiffness structure enhances therapeutic effectiveness while remaining manufacturable through conventional fabrication techniques.
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 system effectively reduces swelling, accelerates healing, and can be reused with ease, providing efficient decompression therapy that improves blood perfusion and lymphatic flow, potentially reducing treatment time and complications.
Implementation Method 1
a vacuum source configured to provide a negative pressure to the interior of the sealed chamber
Implementation Method 2
the decompression layer is configured to compress in a direction away from the tissue site upon operation of the vacuum source
Data Source
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AI summary
A treatment system includes an dressing having a decompression layer and an occlusive layer that secures the dressing about a treatment site, and defines a treatment chamber within which the decompression layer is positioned. Operation of an air displacement device fluidly coupled to the chamber causes the decompression layer to compress away from the tissue site, resulting in a pulling force being imparted onto the treatment site. This decompression of the tissue site increases the perfusion of blood and other fluids, and advantageously may reduce swelling at the treatment site. To increase the degree of lifting of the treatment site, the decompression layer is advantageously constructed to exhibit a parallel plate effect during use of the treatment system. For example, the decompression layer is constructed having a center of stiffness located closer to an outwardly-facing surface of the decompression layer than a tissue-facing surface of the decompression layer.