Multi-layered Wound Dressing with Natural Polymeric Stitching
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Solution Overview
Problem
Conventional non-woven wound dressings have weak tensile strength, particularly in the transverse direction, leading to breakage and increased removal time, and may cause immune rejection due to non-resolvable, inorganic threads left in wounds.
Innovation Solution
A multi-layered non-woven wound dressing is created using natural polymeric yarns with continuous crossing lines in wave or oblique patterns, stitched through each layer to enhance tensile strength in both directions and made from biocompatible materials like alginate, chitosan, and collagen, avoiding rejection reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If longitudinal stitches are added to enhance tensile strength, then strength in longitudinal direction is improved, but vulnerability to transverse tensile force increases
Solution Approach 1:
The patent transitions from symmetric single-direction (longitudinal) stitching to asymmetric multi-directional stitching patterns including transverse stitches, oblique stitches at 45-degree angles, and cross stitches. This asymmetric multi-directional reinforcement distributes tensile forces across different directions, preventing the dressing from being vulnerable specifically in the transverse direction while maintaining longitudinal strength.
Solution Approach 2:
The patent adds dimensional complexity to the stitching pattern by introducing stitches in multiple dimensions: longitudinal (vertical), transverse (horizontal), oblique (diagonal), and cross patterns. This multi-dimensional stitching network creates a three-dimensional reinforcement structure that resists tensile forces from any direction, transforming the single-dimensional reinforcement approach into a comprehensive multi-dimensional solution.
2Strength
If non-resolvable threads are used to enhance dressing strength, then tensile strength is improved, but immune rejection reactions occur when threads remain in wounds
Solution Approach 1:
The patent changes the material parameter of the threads from non-resolvable synthetic materials (nylon, polyester, elastane, polyurethane) to resolvable natural polymers (silk, wool, cotton, alginate, chitosan, collagen). This material parameter change allows the threads to maintain tensile strength during the healing period and then gradually biodegrade and be absorbed by the body, eliminating the harmful effect of immune rejection reactions while preserving the beneficial strength enhancement.
Solution Approach 2:
The patent converts the potential harm of thread material (synthetic non-resolvable materials causing immune rejection) into a benefit by using natural resolvable polymers. The threads provide necessary mechanical support during healing and then transform from a potential harmful foreign body into a beneficial biodegradable scaffold that supports tissue regeneration and is eventually absorbed, turning the persistence issue into a controlled degradation benefit.
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 multi-layered dressing provides enhanced tensile strength in both longitudinal and transverse directions, allowing for whole-piece removal without causing immune reactions, addressing the weaknesses of conventional dressings and ensuring safe biodegradability.
Implementation Method 1
the mean for binding each of the multiple natural polymeric layers includes, but are not limited to, needle punching, thermal bonding, ultrasonic welding, stitching or glue adhesion
Implementation Method 2
the mean for binding each of the multiple natural polymeric layers includes, but are not limited to, needle punching, thermal bonding, ultrasonic welding, stitching or glue adhesion
Data Source
AI summary
Provided is a multi-layered non-woven wound dressing produced by a method including steps of: preparing multiple natural polymeric layers; stacking the multiple natural polymeric layers to form a polymeric structure; preparing multiple natural polymeric threads; and stitching the polymeric structure with the natural polymeric threads to enforce a formed multi-layered non-woven wound dressing and continuous crossing lines to enforce the formed multi-layered non-woven wound dressing to reinforce its longitudinal and transversal tensile strength for a pre-set period of degradation in wound.