Multilayer Adhesive Strip for Pressure-Regulating Therapy Bags
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Solution Overview
Problem
Current pressure-regulating devices for therapies are imprecise and difficult to maintain in sterile conditions, with improvised pressure-retaining volumes not suitable for combination with other gas or pressure therapies.
Innovation Solution
A bag apparatus with a multilayer strip and connection arrangement that enables gas flow between a pressure-regulating device and the bag, maintaining a gas-flow pathway under various pressure conditions, including negative pressures and external mechanical pressures, to facilitate therapies like negative-pressure wound therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If improvised pressure-retaining volumes are used with pressure-regulating devices, then the device can be assembled quickly and simply, but the therapy application becomes imprecise and difficult to maintain in sterile conditions
Solution Approach 1:
The patent employs disposable adhesive strips with integrated gas-permeable materials that are pre-sterilized and single-use. These strips are attached to the bag interior to create temporary, sterile gas pathways that eliminate the need for complex reusable assemblies, thereby maintaining sterile conditions while keeping the system simple to apply and discard
Solution Approach 2:
The adhesive strips are pre-fabricated with gas-permeable pathways and pre-sterilized before use. This preliminary preparation ensures that when the strips are applied to the bag, they immediately provide reliable, sterile gas flow paths without requiring complex assembly procedures or compromising sterile barriers
2Adaptability or versatility
If improvised pressure-retaining volumes are used, then the setup is simple and flexible, but the apparatus cannot be combined with other gas therapies or pressure therapies
Solution Approach 1:
The adhesive strips incorporate multiple functional layers including gas-permeable materials, adhesive layers, and structural support elements in a single component. This multi-functionality allows the same apparatus to support various therapy types (negative pressure wound therapy, positive pressure ventilation, oxygen therapy) by simply changing the gas flow parameters rather than reconfiguring the physical structure
Solution Approach 2:
The gas flow pathway is segmented into discrete functional zones within the adhesive strip structure, with specific regions dedicated to gas permeation, sealing, and structural support. This segmentation allows independent optimization of each function while maintaining overall system simplicity and compatibility with multiple therapy modalities
3Reliability
If complex connection arrangements are used to maintain gas flow under various pressure conditions, then gas flow reliability is improved, but the device complexity increases
Solution Approach 1:
The gas-permeable adhesive strip acts as an intermediary element between the gas source and the treatment area. This intermediate layer maintains reliable gas flow under varying pressure conditions (negative pressure up to -80 mmHg, positive pressure up to +80 mmHg) by its inherent material properties rather than complex mechanical regulators, thereby simplifying the overall connection arrangement
Solution Approach 2:
The adhesive strip material is specifically selected and engineered to maintain optimal gas permeability across a broad range of pressure parameters. The material's physical and chemical parameters are optimized to ensure consistent gas flow whether the system operates under negative pressure, positive pressure, or atmospheric conditions, eliminating the need for pressure-specific configuration changes
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 apparatus provides a reliable and sterile means to apply therapies by maintaining gas flow and pressure within a broad range, enhancing the effectiveness and versatility of pressure-regulating therapies.
Implementation Method 1
an upper layer comprising a partially compressible material defining a gas-flow pathway disposed lengthwise within the bag
Implementation Method 2
said lengthwise gas-flow pathway can be maintained when a mechanical pressure of 20 mm Hg gauge is applied externally to the bag and transmitted through a wall of the bag to an uppermost layer of the multilayer strip
Data Source
AI summary
An apparatus for use in applying a therapy to a human limb includes a bag for surrounding all or part of the limb. The apparatus also includes a connection arrangement, mounted to a wall of the bag in a distal portion of the bag, that enables therethrough a flow of a gas between a pressure-regulating device and an interior space of the bag. The apparatus also includes a gas-permeable strip affixed to an interior surface of the bag and having a length equal to at least 70% of the bag's length. The distal end of the strip is in communication with the connection arrangement in the distal portion of the bag, and a proximal end of the strip is disposed in a proximal portion of the bag. The strip contains a partially compressible, gas-permeable material forming a lengthwise gas-flow pathway.