Ellipsoidal Ovule Dressing for Painless Negative Pressure Therapy
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Solution Overview
Problem
Existing tissue treatment systems with negative pressure and/or instillation often exhibit relatively low levels of tissue ingrowth, which can hinder the healing process and require painful removal of dressing materials.
Innovation Solution
The development of a dressing system that includes an array of interconnected ellipsoidal ovules with fluid pathways, allowing for both fluid removal and instillation, and a backing layer with an attachment device to form a seal with the tissue site, thereby promoting tissue healing while minimizing ingrowth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional dressings are used for tissue treatment, then tissue healing can be promoted, but tissue ingrowth into the dressing occurs causing painful removal
Solution Approach 1:
The dressing is divided into separate functional layers: a non-adherent wound contact layer that prevents tissue ingrowth, an absorbent layer for fluid management, and a backing layer for structural support. This segmentation allows each layer to perform its specific function without causing tissue entanglement, enabling painless removal while maintaining healing benefits
Solution Approach 2:
A specialized wound contact layer acts as an intermediary between the tissue and the dressing structure. This layer is specifically designed to be non-adherent to growing tissue while still allowing fluid passage and therapeutic effect, serving as a mediator that prevents harmful tissue-dressing adhesion while maintaining necessary therapeutic contact
2Productivity
If negative pressure therapy is applied to promote tissue growth, then healing is accelerated, but tissue ingrowth into the dressing increases causing painful removal
Solution Approach 1:
The dressing layers are segmented with specific pore size gradients and structural characteristics that allow negative pressure to effectively draw fluid and promote granulation tissue growth, while the non-adherent wound contact layer specifically prevents ingrowth into the dressing matrix, enabling productive healing without harmful entanglement
Solution Approach 2:
Different layers of the dressing have locally optimized properties: the wound contact layer has non-adherent qualities, the absorbent layer has high capillary action for fluid removal, and the backing layer provides structural integrity. This local quality differentiation allows negative pressure to achieve its healing effect while preventing tissue ingrowth into inappropriate layers
3Reliability
If instillation therapy is used to cleanse tissue site, then bacterial burden is reduced, but fluid management complexity increases
Solution Approach 1:
The dressing integrates multiple functions into a single unified structure: the wound contact layer provides non-adherent protection, the absorbent layer manages fluid instillation and removal through capillary action, and the backing layer provides structural support. This merging eliminates the need for separate complex fluid management systems while maintaining effective instillation therapy for infection control
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 system effectively enhances tissue healing by allowing for the migration of epithelial and subcutaneous tissues, improved blood and interstitial fluid flow, and micro-deformation of tissue, while reducing the likelihood of painful ingrowth and facilitating easy removal of the dressing.
Implementation Method 1
reducing pressure in proximity to a tissue site can augment and accelerate growth of new tissue at the tissue site
Implementation Method 2
improved blood and interstitial fluid flow
Implementation Method 3
a backing layer with an attachment device to form a seal with the tissue site
Implementation Method 4
migration of epithelial and subcutaneous tissues
Implementation Method 5
micro-deformation of tissue at a wound site
Implementation Method 6
The development of a dressing system that includes an array of interconnected ellipsoidal ovules with fluid pathways, allowing for both fluid removal and instillation, and a backing layer with an attachment device to form a seal with the tissue site, thereby promoting tissue healing while minimizing ingrowth
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~1F
AI summary
An apparatus for filling a wound can include an array of at least four truncated ellipsoids interconnected to define at least one fluid path through, for example perpendicular to, the array. The longest principal axis of each ellipsoid may be perpendicular to the array. Each truncated ellipsoid may be a spheroid and/or may include an approximately elliptical contact surface at each contact surface between two interconnected ellipsoids. Each fluid pathway may have four continuously-curved concave sides and may have a parallelogram- shaped cross-section with continuously-curved concave edges. A dressing may include the apparatus, a dressing layer coupled to the apparatus, a backing layer disposed over a surface of the dressing layer opposite the apparatus, and an attachment device disposed on at least a margin of the backing layer. Methods of treating various tissue sites using the apparatus or dressing with negative-pressure therapy are also disclosed.