Layered Manifold Dressing for Negative Pressure Therapy
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Solution Overview
Problem
Current negative-pressure therapy systems for treating tissue wounds lack improvements in therapy systems, components, and processes, which can benefit healthcare providers and patients by enhancing wound healing and tissue growth.
Innovation Solution
The development of new systems, apparatuses, and methods for negative-pressure therapy, including a dressing with a cuff design for wrapping around limbs, and an apparatus promoting circulation through a subcutaneous lymph vascular network using layered manifold structures and a cover layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer foam dressing is used, then the structure is simple, but it cannot provide both rigid support and soft compression simultaneously
Solution Approach 1:
The dressing is divided into multiple functional layers: a rigid foam layer for structural support, a soft foam layer for compression and cushioning, and a permeable barrier layer for fluid management. Each layer performs a specific function, allowing the system to achieve both rigid support and soft compression that a single layer cannot provide.
Solution Approach 2:
The dressing combines different foam materials with varying physical properties - rigid foam for structural integrity and soft foam for compliant compression. This composite structure enables the dressing to simultaneously provide mechanical support and gentle pressure distribution, resolving the contradiction between simplicity and effectiveness.
2Productivity
If negative pressure is applied to promote tissue growth, then healing is accelerated, but excessive pressure may cause tissue damage
Solution Approach 1:
The soft foam layer is strategically positioned to contact the tissue directly, providing localized compression only where needed. The rigid foam layer provides distributed support without concentrating pressure on specific tissue points. This layered approach ensures that negative pressure promotes healing while the soft layer prevents excessive localized pressure that could cause tissue damage.
Solution Approach 2:
The soft foam layer acts as a cushioning intermediary between the rigid support structure and the tissue. It pre-absorbs and distributes pressure before it reaches the tissue, preventing harmful concentration of forces while still allowing the negative pressure therapy to accelerate healing processes.
3Strength
If a rigid structure is used to provide support, then structural integrity is maintained, but it cannot accommodate tissue deformation under pressure
Solution Approach 1:
The support function is segmented between the rigid foam layer, which maintains structural integrity and provides overall support, and the soft foam layer, which deforms to accommodate tissue movement and pressure changes. This division allows the system to simultaneously provide strong support and adapt to tissue deformation.
Solution Approach 2:
Different regions of the dressing have different mechanical properties - the rigid foam provides structural stability in areas requiring support, while the soft foam provides compliance and adaptability in areas contacting the tissue. This spatial variation in material properties resolves the contradiction between structural strength and tissue accommodation.
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 proposed solutions enhance wound healing by promoting tissue growth, improving blood flow, and reducing healing times, while also providing effective incision management and improved circulation, thereby reducing post-operative complications.
Implementation Method 1
a source of negative pressure is fluidly coupled to the at least one manifold layer through the cover layer. Negative pressure from the source of negative pressure is applied to the at least one manifold layer
Data Source
AI summary
An apparatus for promoting circulation through a subcutaneous lymph vascular network may comprise a first manifold layer, a second manifold layer coupled to the first manifold layer, and a cover layer coupled to the second manifold layer. The first manifold may have a first stiffness, and the second manifold may have a second stiffness greater than the first stiffness. In some embodiments, the apparatus may additionally have a fluid interface configured to fluidly couple at least one of the first manifold layer and the second manifold layer to a fluid conductor through the cover layer. The fluid conductor may be coupled to or configured to be coupled to a source of negative pressure.