Elastic Wound Dressing Structure for Joint Conformability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Post-operative wounds, especially on sites like the knee or hip following surgery, face issues with blistering and infection due to dressing incompatibility with patient movement, as existing absorbent dressings tend to delaminate and lose resilience with repeated movement, leading to friction and restricted mobility.
Innovation Solution
A wound dressing with a gathered absorbent layer using resilient yarns that can extend and contract, combined with an adhesive layer and inelastic warp stitching, allowing the dressing to maintain conformability and reduce blistering by accommodating joint movement without delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If gel-forming dressings are used for high exudate absorption, then absorption capacity is improved, but the dressing shrinks and loses conformability
Solution Approach 1:
The patent combines gel-forming fibres (sodium carboxymethylcellulose) with non-gel forming fibres (polyester, polypropylene) in a composite non-woven fabric. The gel-forming fibres provide high exudate absorption capacity while the non-gel forming fibres maintain structural integrity and prevent shrinkage, resolving the contradiction between absorption capacity and conformability
Solution Approach 2:
The patent modifies the composition parameters of the absorbent layer by controlling the ratio of gel-forming to non-gel forming fibres, and adjusting the basis weight and fibre diameter distribution. This allows optimization of both absorption capacity and dimensional stability to maintain conformability during joint movement
2Device complexity
If traditional absorbent pads are used, then simplicity is maintained, but they delaminate with joint movement
Solution Approach 1:
The patent uses composite non-woven fabrics with multiple fibre types bonded together through needle punching or thermal bonding. This creates a multi-layer composite structure that maintains integrity during movement while keeping the overall dressing design relatively simple
Solution Approach 2:
The patent employs flexible non-woven fabric layers that can stretch and move with the joint while maintaining adhesion. The fabric structure allows for elastic deformation without delamination, ensuring reliability during patient movement
3Strength
If dressings are made rigid for structural stability, then strength is improved, but conformability to moving joints is lost
Solution Approach 1:
The patent creates a dynamic dressing structure that transitions from rigid to flexible based on movement requirements. The non-woven fabric with elastic fibres and gathered construction allows the dressing to adapt its stiffness - providing structural strength at rest and flexibility during joint movement
Solution Approach 2:
The patent divides the absorbent layer into multiple gathered sections using elastic bands or stitching. This segmentation allows each section to move independently with joint movement while maintaining overall structural integrity, balancing strength and conformability
4Adaptability or versatility
If dressings are made stretchable for joint movement, then conformability is improved, but adhesion strength is reduced
Solution Approach 1:
The patent combines adhesive layers with elastic non-woven fabric layers in a composite structure. The adhesive layer provides strong bonding to the skin while the elastic fabric layer provides stretchability for joint movement, resolving the contradiction between adhesion strength and stretchability
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 dressing effectively reduces blistering and maintains close conformability with the wound during movement, ensuring secure adhesion and non-traumatic removal, while maintaining high absorbency and fluid handling capacity comparable to multi-layered dressings.
Implementation Method 1
carboxymethylated cellulosic materials in situations where a high degree of exudate absorption is required
Implementation Method 2
This causes the carboxymethylated fibres to form a gel
Implementation Method 3
the yarn or thread is able to extend and contract to its former shape
Implementation Method 4
an adhesive layer overlying the absorbent layer on a surface furthest from the wound in use and extending beyond the periphery of the absorbent layer so as to secure the dressing to the skin
Data Source
AI summary
A wound dressing comprising an absorbent layer, the absorbent layer being gathered in a longitudinal direction by one or more resilient yarns.