Integral Blister Pump Dressing for Portable Negative-Pressure Therapy

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Solution Overview

Problem

The cost and complexity of negative-pressure therapy systems pose challenges for manufacturers, healthcare providers, and patients, limiting their widespread application in wound care.

Innovation Solution

A dressing system with an integral pump that includes a sealing layer, a blister with check valves, and a negative-pressure source, allowing for a peel-and-place application that does not require continuous electrical supply, enabling ambulatory patients to manage the therapy independently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional negative-pressure therapy systems are used, then effective wound treatment is achieved, but cost and complexity increase

Engineering Contradiction:

Improveeffectiveness of wound treatmentVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system is divided into distinct functional modules: a dressing assembly with absorbent material and sealing layer, a separate negative-pressure source (blister pump), and check valves. This segmentation allows each component to be optimized independently and simplifies the overall system architecture, reducing complexity while maintaining therapeutic effectiveness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The negative-pressure source is designed as a self-contained mechanical pump that operates without external electrical power. The pump uses manual compression of the blister to create negative pressure, and the check valves automatically maintain pressure differentials without active control. This self-service mechanism eliminates complex electrical systems while preserving clinical efficacy.

Inventive Principle:

Principle #25Self-service

2Reliability

If traditional negative-pressure therapy systems are used, then effective wound treatment is achieved, but cost increases

Engineering Contradiction:

Improveeffectiveness of wound treatmentVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The dressing assembly is designed as a disposable component that can be manufactured at low cost using simple materials such as absorbent foam, adhesive sealing layers, and integral blisters. This disposable approach eliminates the need for expensive sterilization and maintenance of reusable components, significantly reducing overall system cost while maintaining treatment effectiveness.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The negative-pressure source is integrated directly into the dressing assembly as an integral blister, combining what were traditionally separate components. This merging eliminates the need for additional tubing, connectors, and external pump mechanisms, reducing manufacturing steps and material costs while simplifying the overall device structure.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If continuous electrical supply is required, then negative-pressure therapy can be maintained, but portability and patient independence are reduced

Engineering Contradiction:

Improvemaintenance of negative pressureVSAvoidpatient portability and independence

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system replaces electrical pump mechanisms with a purely mechanical compression-based negative-pressure source. The blister pump uses manual compression to generate negative pressure, and mechanical check valves maintain the pressure differential. This mechanical substitution eliminates the need for electrical power, enabling complete portability and patient independence while maintaining reliable negative-pressure therapy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Facilitates effective negative-pressure therapy for low-acuity tissue sites, promoting tissue growth and reducing healing times while being cost-effective and user-friendly for mobile patients.

Implementation Method 1

A first check valve may be fluidly coupled to the absorbent and the blister and configured to prevent fluid flow from the blister into the absorbent if the blister is moved from the expanded position to the collapsed position

Methodology Applied

Scientific EffectCheck valve mechanism: Valve

Implementation Method 2

reducing pressure in proximity to a tissue site can augment and accelerate growth of new tissue at the tissue site

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Implementation Method 3

The blister may expand from the collapsed position to the expanded position to draw fluid from the absorbent

Methodology Applied

Scientific EffectFluid flow: Suction

Data Source

PatentUS12521478B2Low acuity dressing with integral pump

Publication Date: 2026.01.13 KCI LICENSING INC

AI summary

Systems, assemblies, and methods for providing negative-pressure therapy to a tissue site are described. The system can include an absorbent and a sealing layer configured to cover the absorbent. The system can also include a blister fluidly coupled to the absorbent. The blister may have a collapsed position and an expanded position. A first check valve may be fluidly coupled to the absorbent and the blister and configured to prevent fluid flow from the blister into the absorbent if the blister is moved from the expanded position to the collapsed position. A second check valve may be fluidly coupled to the blister and the ambient environment and configured to prevent fluid flow from the ambient environment into the blister if the blister is moved from the collapsed position to the expanded position.