Protective Multilayer Dressing for Open-Abdomen Negative-Pressure Therapy
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Solution Overview
Problem
Existing negative pressure therapy devices for open abdomen suffer from rapid saturation, adherence to internal organs, and inefficient pressure distribution, leading to complications such as deep tissue retraction and necrosis.
Innovation Solution
A multilayer protective dressing with air-filled bubbles and uniformly distributed holes allows for optimized negative pressure distribution and drainage, preventing adherence to internal organs and reducing saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flexible film dressing with openings is used for negative pressure therapy, then fluid drainage is improved, but the dressing adheres to internal organs causing tissue damage
Solution Approach 1:
The dressing is divided into multiple functional layers: a flexible film layer with openings for drainage, an intermediate layer with air-filled bubbles for protection, and a sponge layer for fluid absorption. This segmentation allows each layer to perform its specific function without the drainage openings directly contacting and damaging internal organs.
Solution Approach 2:
The intermediate layer with air-filled bubbles acts as an intermediary between the flexible film with drainage openings and the internal organs. This protective intermediary prevents direct contact and adhesion while still allowing negative pressure to be transmitted and fluids to drain through the system.
2Stress or pressure
If encapsulated members with fenestrations are used for NPT, then pressure distribution is improved, but the members saturate quickly reducing effectiveness
Solution Approach 1:
The dressing incorporates a sponge material with porous structure that has high fluid absorption capacity. This porous material can absorb and retain large amounts of exudate, preventing rapid saturation and extending the effective duration of negative pressure therapy.
Solution Approach 2:
The dressing combines multiple materials with complementary properties: a flexible film for structural integrity and drainage openings, an intermediate layer with air-filled bubbles for pressure distribution and protection, and a porous sponge material for fluid absorption. This composite structure achieves both uniform pressure distribution and extended therapy duration.
3Productivity
If negative pressure is applied directly through a film dressing, then fluid removal is enhanced, but deep tissue retraction and necrosis occur
Solution Approach 1:
The intermediate layer with air-filled bubbles provides beforehand cushioning protection to the internal organs before negative pressure is applied. These bubbles act as a protective cushion that distributes the mechanical stress and prevents direct suction of tissues through the drainage openings, thereby preventing tissue retraction and necrosis.
Solution Approach 2:
The flexible film layer with drainage openings provides a selective barrier that allows fluids to pass through while preventing direct contact between the negative pressure source and internal organs. The flexibility of the film allows it to conform to the abdominal cavity shape while maintaining the protective function.
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 drainage capacity and uniform pressure distribution, minimizing tissue retraction and necrosis by maintaining effective negative pressure over distal abdominal areas.
Implementation Method 1
optimized the distribution of negative pressure over the surface of the sheet to the most distal areas
Implementation Method 2
an intermediate layer (3), arranged between the upper (1) and lower (2) layers... incorporates a plurality of bubbles (7) evenly distributed and filled with a gaseous fluid at low pressure
Implementation Method 3
improve drainage capacity... uniformly distributed that allow the passage of fluids through them
Implementation Method 4
negative pressure therapy (NPT)... removes exudate and non-viable tissue
Data Source
Figure 1~2
AI summary
Protective dressing for abdominal viscera for application of negative pressure therapy in open abdomen, made up of an upper layer (1), an intermediate layer (3) and a lower layer (2), each of which consists of a laminar body. The upper layer (1) includes a plurality of first holes (6) for the passage of fluid and the intermediate layer (3) includes numerous low pressure gas filled bubbles (7) and a plurality of second holes (8) for the passage of fluid. These bubbles (7) prevent possible damage to the abdomen and prevent the sheets from sticking together. The three layers adhere to each other at their respective perimeter edges.