Variable Wound Dressing with Pressure-Dependent Rigidity

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Solution Overview

Problem

Existing reduced-pressure treatment systems for wounds lack a variable and pliable dressing that effectively transitions to a less-pliable state under reduced pressure, which is necessary for optimal tissue healing and fluid management.

Innovation Solution

A variable wound dressing with a sealed envelope containing spacing members that become more rigid under reduced pressure, forming a treatment space between the dressing and the wound, and a reduced-pressure subsystem to supply and manage pressure for enhanced tissue treatment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a traditional rigid dressing is used, then structural stability is maintained, but adaptability to wound shape and ease of application deteriorate

Engineering Contradiction:

Improvestructural stabilityVSAvoidadaptability to wound shape

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The dressing cover is designed to be dynamic in its mechanical properties, transitioning from a pliable state during application to a less-pliable state during treatment. This allows the dressing to adapt to different wound shapes during application, then maintain structural stability during therapy through the phase transition mechanism.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The dressing utilizes phase transition of the material from pliable to less-pliable state in response to reduced pressure application. This phase transition enables the dressing to automatically adjust its mechanical properties based on the treatment phase, providing both adaptability and structural stability as needed.

Inventive Principle:

Principle #36Phase transitions

2Ease of operation

If a pliable dressing is used, then ease of application and adaptability improve, but structural stability and ability to maintain treatment space deteriorate

Engineering Contradiction:

Improveease of applicationVSAvoidability to maintain treatment space

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The dressing cover dynamically changes its mechanical state from pliable to less-pliable in response to reduced pressure, enabling easy application in the pliable state while automatically gaining the structural stability needed to maintain treatment space once treatment begins.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The material undergoes phase transition from pliable to less-pliable state when exposed to reduced pressure, allowing the dressing to be easily applied in its initial state while automatically transitioning to a state that maintains treatment space integrity during therapy.

Inventive Principle:

Principle #36Phase transitions

3Device complexity

If a non-variable dressing is used, then device complexity is reduced, but ability to provide optimal treatment conditions deteriorates

Engineering Contradiction:

Improvedevice complexityVSAvoidability to provide optimal treatment conditions

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The dressing is designed to automatically adjust its own mechanical properties in response to reduced pressure without requiring external control mechanisms. The material self-regulates its pliability through phase transition, providing optimal treatment conditions while maintaining simple device architecture.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The dressing utilizes changes in physical parameters (mechanical properties from pliable to less-pliable) in response to pressure changes, enabling the system to provide optimal treatment conditions through material property variation rather than complex mechanical adjustments.

Inventive Principle:

Principle #35Parameter changes

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 facilitates faster wound healing by maintaining a consistent treatment space without inward pressure on wound margins, reducing the need for frequent dressing changes and promoting tissue growth through controlled fluid management.

Implementation Method 1

a variable cover that is pliable at ambient pressure and less pliable when placed under reduced pressure

Methodology Applied

Scientific EffectPressure-dependent material property change:

Implementation Method 2

providing a reduced pressure in proximity to a tissue site augments and accelerates the growth of new tissue at the tissue site

Methodology Applied

Scientific EffectReduced pressure therapy:

Implementation Method 3

forming a treatment space between the dressing and the wound

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Data Source

PatentUS8663132B2Reduced-pressure treatment systems and methods employing a variable cover

Publication Date: 2014.03.04 KCI LICENSING INC

AI summary

A system, dressing, and method for providing reduced pressure treatment to a tissue site on a wound bed of a patient includes a variable wound dressing having a variable cover that is pliable at ambient pressure and less-pliable when placed under reduced pressure. The variable wound dressing has a first side and a second, patient-facing side, and in use, a treatment space is formed between the second, patient-facing side of the variable dressing and the wound bed. One or more ports are used to supply reduced pressure within the variable cover and to the wound site. A reduced-pressure subsystem is also included that is operable to supply reduced pressure to the one or more ports.