Hydrocellular Dressing with Openwork Silicone Frame
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Solution Overview
Problem
Current hydrocellular absorbent dressings face challenges in achieving optimal breathability, cohesion, and ease of manufacture, particularly when using silicone adhesives, which are occlusive and difficult to fix durably to absorbent foams, leading to issues with adhesion and wound care for chronic and acute wounds.
Innovation Solution
A dressing design featuring a continuous film with an openwork frame coated with adhesive silicone gel, where the frame's openings are not blocked, combined with a non-absorbent veil interposed between the absorbent foam and the support, allowing for better cohesion and easier manufacturing, and optionally including a micro-adherent interface layer for wound contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone adhesive is applied discontinuously to ensure breathability, then breathability is improved, but adhesion to absorbent materials deteriorates
Solution Approach 1:
The support is segmented into a continuous film portion and an openwork frame portion, where the frame provides adhesive contact points while the film ensures breathability. This segmentation allows the adhesive silicone gel to be concentrated on the frame structure rather than applied discontinuously across the entire surface.
Solution Approach 2:
A non-absorbent veil is introduced as an intermediary layer between the absorbent foam and the support. This veil enhances adhesion to the absorbent material while maintaining the breathability provided by the openwork frame structure, resolving the conflict between adhesion strength and breathability.
2Strength
If silicone adhesive is applied continuously to improve adhesion, then adhesion is improved, but breathability deteriorates
Solution Approach 1:
The support structure is divided into a continuous film for breathability and an openwork frame coated with silicone gel for adhesion. This segmentation allows continuous adhesive coverage on the frame while maintaining open spaces for vapor transmission, resolving the contradiction between continuous adhesion and breathability.
3Reliability
If the dressing structure is made complex to meet all specifications, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The continuous film and openwork frame are merged into a single integrated support structure, eliminating the need for separate assembly steps. The silicone gel is applied directly to the frame in its open state, and cohesion is achieved through the integrated design rather than complex multi-step assembly processes.
Solution Approach 2:
The silicone gel is applied in a liquid state to the openwork frame, allowing easy coating before the frame is assembled with the film. The gel then cures to provide strong adhesion. This parameter change from liquid application to solid cured state simplifies the manufacturing process while ensuring reliable cohesion.
4Duration of action of stationary object
If the dressing remains in place for longest possible time to improve effectiveness, then duration is improved, but adhesion to periwound skin deteriorates due to maceration
Solution Approach 1:
The openwork frame structure acts as a porous material that allows vapor transmission while providing adhesive contact. This porous design enables the dressing to remain adhered to the skin for extended periods while preventing maceration through continuous breathability, resolving the contradiction between duration and skin health.
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 solution provides a breathable, impermeable, and cohesive dressing that maintains adhesion even when loaded with wound exudates, is easier to manufacture, and is respectful of the wound environment, ensuring effective wound care without impairing healing.
Implementation Method 1
an openwork frame coated, on at least one of its faces, with an adhesive silicone gel
Implementation Method 2
a continuous film with an openwork frame... breathable, impermeable
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to an absorbent dressing comprising a breathable impermeable substrate (4) and an absorbent foam (2), which is particularly suitable for use in the care of chronic or acute wounds. The invention relates to a dressing comprising an absorbent foam (2) and a protective substrate (4) that is impermeable to fluids, but permeable to water vapour, said substrate being formed by assembling a film (4a) and an openwork reinforcement that is coated with an adhesive silicone gel (4b) without blocking the holes in the reinforcement. In addition, the dressing comprises a non-absorbent web (5) which is disposed between the absorbent foam (2) and the substrate (4), which adheres to the adhesive silicone gel coating on the reinforcement and which is secured to the absorbent foam (2).