NPWT Sensor Activity Classification via Pressure Monitoring

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Solution Overview

Problem

Current wound dressings for negative pressure wound therapy lack effective visualization and information about the wound site beneath the dressing, leading to premature dressing changes and inadequate monitoring of wound healing progress.

Innovation Solution

A system comprising a negative pressure therapy apparatus with a sensor and controller that monitors pressure changes to classify patient activity and transmit data, allowing for real-time monitoring and feedback on wound healing without disturbing the wound.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If traditional wound dressings are used for negative pressure wound therapy, then the wound can be treated with negative pressure, but the clinician cannot effectively monitor the wound site condition without premature dressing changes

Engineering Contradiction:

Improvewound site informationVSAvoiddressing change frequency

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The patent applies color-changing indicators or sensors that visually display wound conditions (such as infection, healing progress, or fluid accumulation) through color transitions. This allows clinicians to monitor wound status remotely without removing the dressing, eliminating the need for premature dressing changes while maintaining continuous visual information about the wound site.

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The patent replaces the mechanical approach of physically removing and changing dressings to inspect wounds with electronic or optical sensing systems. These sensors detect wound conditions (moisture, temperature, pH, etc.) and transmit data wirelessly, substituting the mechanical inspection process with automated monitoring that preserves the dressing integrity and reduces change frequency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If the dressing is changed frequently to monitor wound healing, then the wound condition can be inspected, but the therapeutic effect is reduced and healing progress is interrupted

Engineering Contradiction:

Improvewound monitoring accuracyVSAvoiddressing retention time

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent incorporates feedback mechanisms where sensors continuously monitor wound parameters (exudate levels, temperature, pH, oxygen saturation) and provide real-time or periodic feedback to clinicians. This continuous feedback loop ensures reliable wound monitoring information is obtained without interrupting the dressing, allowing the dressing to remain in place for the full intended duration while maintaining accurate monitoring capability.

Inventive Principle:

Principle #23Feedback

3Quantity of substance

If current wound dressings are used, then negative pressure therapy can be applied, but the absorbent capacity cannot be fully utilized due to premature dressing changes

Engineering Contradiction:

Improveabsorbent capacityVSAvoiddressing change timing

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The patent incorporates preliminary monitoring capabilities that detect wound conditions and predict when the dressing will reach its absorbent capacity limit or when clinical intervention is needed. This preliminary detection allows the dressing to remain in place until the optimal change time, ensuring the full absorbent capacity is utilized without premature removal, thereby maximizing the therapeutic benefit of each dressing application.

Inventive Principle:

Principle #10Preliminary action

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

Enables continuous, non-invasive monitoring of wound healing progress and patient activity, reducing unnecessary dressing changes and improving wound care efficiency.

Implementation Method 1

The sensor can be configured to monitor a magnitude or frequency of pressure in the fluid flow path generated by the negative pressure source

Methodology Applied

Scientific EffectPressure sensing:

Data Source

PatentUS20230240897A1Reduced pressure therapy systems and methods for monitoring patient movement

Publication Date: 2023.08.03 T J SMITH & NEPHEW

AI summary

According to certain embodiments, an apparatus for applying negative pressure to a wound can include a negative pressure source, a sensor, and a controller. The negative pressure source can be configured to couple via a fluid flow path to a wound dressing and provide negative pressure to the wound dressing. The sensor can be configured to monitor a magnitude or frequency of pressure in the fluid flow path generated by the negative pressure source. The controller can be configured to determine an activity classification, such as breathing, changing positions while lying, sitting, walking, standing, jumping, traversing stairs, leg extending, leg bending, and performing chair squats, based on a change in the magnitude of pressure over time while the negative pressure source maintains the magnitude of pressure in the fluid flow path below a negative pressure threshold. The controller can output an indication of the activity classification.