Wound Dressing Patch Stiffness and Adhesion Control
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Solution Overview
Problem
Conventional wound dressing patches with thin adhesive sheets face issues of self-bonding due to increased flexibility, leading to partial or complete unusability, especially when antiseptic latex gloves are worn, causing contamination and skin damage during attachment and detachment.
Innovation Solution
A wound dressing patch design incorporating a backing film, an absorbent foam pad, and a lining material along the adhesive sheet's peripheral edge to provide stiffness and prevent curling, using polymers like polyacrylamide and thermoplastic elastomers, which maintains flexibility and adhesiveness while preventing self-bonding and facilitating easy attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adhesive sheet is made thin to improve flexibility and adhesiveness, then the sense of foreign object is minimized and adhesiveness is improved, but the adhesive sheet bonds and adheres to itself due to increased flexibility
Solution Approach 1:
The adhesive sheet is segmented into multiple regions with different adhesive properties. A first adhesive region with strong adhesive force is positioned away from the release sheet removal direction, while a second adhesive region with weak adhesive force is positioned near the removal direction. This segmentation allows the adhesive sheet to maintain strong bonding to the wound while preventing self-bonding during application and removal, resolving the contradiction between adhesiveness and self-bonding prevention.
2Shape
If a thin adhesive sheet is used to improve flexibility, then the adhesive sheet can conform to skin curvature, but it curls up and adheres to itself when the release sheet is removed
Solution Approach 1:
Different regions of the adhesive sheet are assigned different local qualities in terms of adhesive force. The first adhesive region has strong adhesive force for reliable wound bonding, while the second adhesive region has weak adhesive force to prevent curling and self-adhesion during release sheet removal. This local quality differentiation maintains both flexibility and structural stability.
3Strength
If the adhesive sheet has predetermined stiffness to maintain structural integrity, then it can be handled easily, but it becomes difficult to stick to the skin due to skin curvature
Solution Approach 1:
The adhesive properties of the adhesive sheet are changed spatially, with the first adhesive region having strong adhesive force and the second adhesive region having weak adhesive force. This parameter change allows the adhesive sheet to conform to skin curvature while maintaining structural integrity, as the weak adhesive region near the removal direction prevents excessive stiffness and self-bonding.
Data Source
AI summary
A wound dressing patch includes a backing film; an absorbent foam pad coupled to the a portion of one surface of the backing film; an adhesive sheet provided on a remaining portion of the one surface of the backing film; and a lining material provided along a peripheral edge portion of the adhesive sheet and configured to impart a predetermined stiffness to the backing film. The lining material is spaced apart from the absorbent foam pad to surround the absorbent foam pad in a form of a substantially closed curve along the peripheral edge portion of the adhesive sheet, and a distance between the lining material and an end of the adhesive sheet is shorter than a distance between the lining material and an edge of the absorbent foam pad.