Two-Stage Wound Dressing with Removable Carrier
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Solution Overview
Problem
Existing wound dressings lack absorbent capacity, leading to pooling of wound exudates and difficulty in removing the backing layer without exposing the wound, leaving it unprotected.
Innovation Solution
A two-stage wound dressing assembly with a wound cover and a removable carrier, where the wound cover has a pressure-sensitive adhesive with colloidal absorbents and the carrier is formed of a foamed polymeric web, allowing for easy removal while maintaining wound protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wound cover and backing layer are securely attached to one another, then the dressing provides stable wound protection, but the backing layer cannot be removed without exposing the wound
Solution Approach 1:
The backing layer is divided into a first portion and a second portion. The first portion remains attached to the wound cover to maintain wound protection, while the second portion is removed to allow dressing change. This segmentation resolves the contradiction by allowing partial retention and partial removal of the backing layer.
Solution Approach 2:
The second portion of the backing layer is extracted or removed from the assembly after the wound cover is applied. This extraction allows the user to remove the adhesive portion that contacts healthy skin while leaving the wound-protecting portion in place, thus maintaining reliability while improving ease of operation.
2Reliability
If adhesive is applied to the entire skin-facing surface of the backing layer, then secure attachment is achieved, but blood-stained adhesive remains at the wound site after removal
Solution Approach 1:
The backing layer is segmented into a first portion with adhesive that remains on the wound site and a second portion with adhesive that is removed. This segmentation ensures that only the necessary adhesive portion contacts the wound area, minimizing blood-stained residue while maintaining secure attachment where needed.
Solution Approach 2:
Different portions of the backing layer have different adhesive properties or adhesive amounts. The first portion has adhesive suitable for wound site attachment, while the second portion has adhesive optimized for secure skin attachment that can be cleanly removed. This local differentiation reduces harmful blood-stained residue.
3Ease of operation
If the wound cover is made very flexible to conform to skin, then comfort is improved, but the dressing becomes difficult to handle without wrinkling or self-adhesion
Solution Approach 1:
The flexible wound cover is segmented from the backing layer, allowing the wound cover to be highly flexible for skin conformity while the backing layer provides structural support for handling. This segmentation enables the flexible portion to conform to skin without being difficult to handle.
Solution Approach 2:
The backing layer and wound cover have asymmetric properties: the backing layer is more rigid and adhesive for handling and attachment, while the wound cover is more flexible and non-adhesive for skin comfort. This asymmetry resolves the contradiction between flexibility and handleability.
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 effective wound closure, absorbent capacity, and protection from the environment by allowing the wound cover to remain adhered to the skin after removing the carrier, preventing exposure and exudate pooling.
Implementation Method 1
a wound cover pressure sensitive adhesive comprising a colloidal absorbent
Implementation Method 2
The carrier is formed of a foamed polymeric web having a height of between about 200 and about 500 μm
Implementation Method 3
a pressure sensitive adhesive provides secure attachment of the dressing to bare skin adjacent to a wound
Data Source
AI summary
A two-stage wound dressing assembly includes a wound cover and a carrier. The wound cover has a length and width substantially greater than a height (or thickness), a first major surface, and a second major surface comprising a polyurethane film, opposite the first. The first major surface has disposed thereon a wound cover pressure sensitive adhesive comprising a colloidal absorbent, and it is arranged and configured to adhere to mammalian skin during use. The carrier has a length and width substantially greater than a height (or thickness), a first major surface, and a second major surface, opposite the first. The carrier is formed of a foamed polymeric web having a height of between about 200 and about 500 μm. The first major surface of the carrier is disposed in facing relation and is removably attached to the second major surface of the wound cover, and it has disposed thereon at least one pressure sensitive adhesive. After application of the wound cover to skin for use, the carrier is removable from the wound cover to leave the wound cover adhered to the skin.