Electrical Stimulation for Pressure Ulcer Prevention

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Solution Overview

Problem

Current methods for preventing pressure ulcers, particularly deep tissue injuries, are ineffective as they often require pre-conditioning, can lead to muscle fatigue, and do not actively engage the patient's muscles, resulting in high incidence rates of pressure ulcers.

Innovation Solution

A method involving repeated cycles of electrical stimulation of loaded muscles, with short periods of contraction followed by longer periods of relaxation, to dynamically reshape the muscle, redistribute pressure, and restore blood flow without causing muscle fatigue, using electrodes to apply electrical stimuli sufficient for muscle contraction but not enough to lift the body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If frequent repositioning or specialized cushions are used to prevent pressure ulcers, then tissue pressure relief is achieved, but patient compliance is difficult to maintain and the methods are expensive and heavy

Engineering Contradiction:

Improvepressure ulcer prevention effectivenessVSAvoidpatient compliance and operational simplicity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system enables patients to actively participate in their own pressure ulcer prevention through biofeedback-controlled muscle stimulation. The electrical stimulation activates patient muscles to perform pressure relief movements autonomously, reducing dependency on staff assistance and improving compliance through patient empowerment and real-time feedback.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces passive mechanical pressure relief methods (cushions, manual repositioning) with an active physiological system using electrical stimulation and biofeedback. This substitutes mechanical interventions with a controlled physiological response, making the system lighter, more adaptable, and easier to operate.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If electrical stimulation is applied continuously to prevent pressure ulcers, then muscle activation is maintained, but muscle fatigue occurs reducing effectiveness

Engineering Contradiction:

Improvepressure relief effectivenessVSAvoidmuscle activation duration before fatigue

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The system applies electrical stimulation in periodic cycles rather than continuously. The biofeedback mechanism monitors muscle activation levels and automatically adjusts stimulation timing, creating optimal rest intervals that prevent fatigue while maintaining pressure relief effectiveness throughout extended periods.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The biofeedback system continuously monitors muscle activation and provides real-time feedback to adjust stimulation parameters. This feedback loop ensures stimulation is applied only when needed and at appropriate intensities, preventing muscle fatigue while maintaining effective pressure relief over extended durations.

Inventive Principle:

Principle #23Feedback

3Stress or pressure

If passive pressure relief methods are used, then tissue load is reduced, but the patient's own muscles are not actively engaged

Engineering Contradiction:

Improvetissue pressure reductionVSAvoidactive muscle engagement

Core Design Contradiction:

Stress or pressureVSAdaptability or versatility

Solution Approach 1:

The system activates the patient's own muscles through electrical stimulation to perform pressure relief functions. This self-service approach engages the patient's physiological systems actively, improving both pressure relief and muscle maintenance compared to passive external support methods.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system transitions from static passive support to dynamic active muscle engagement. Electrical stimulation induces real-time muscle contractions that dynamically adjust pressure distribution, providing both pressure relief and active muscle participation that adapts to changing conditions.

Inventive Principle:

Principle #15Dynamics

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

This approach effectively reduces muscle fatigue and prevents pressure ulcers by maintaining tissue oxygenation and redistributing pressure, allowing for prolonged periods of immobility without the need for pre-conditioning, significantly reducing the incidence of deep tissue injuries.

Implementation Method 1

transmitting electrical stimuli to a loaded muscle to effect contraction thereof

Methodology Applied

Scientific EffectElectrical stimulation: Electrical Impedance Tomography

Implementation Method 2

restoring blood flow and increasing oxygenation to the loaded tissue

Methodology Applied

Scientific EffectBlood flow restoration: Pressure Gradient

Data Source

PatentUS8874223B2Mitigation of pressure ulcers using electrical stimulation

Publication Date: 2014.10.28 NEUROKINETIC MEDICAL INC

AI summary

A method is provided for treating pressure ulcers by transmitting an electrical stimulus sufficient to effect contraction of a loaded muscle, wherein the method comprises the steps of providing an electrical transmission for effecting contraction of the loaded muscle, transmitting sufficient electrical stimulation to the muscle to contract it for a predetermined short period of time, and ceasing transmission of the stimulus to the muscle for a predetermined longer period of muscle relaxation, whereby the predetermined period of relaxation is sufficient to minimize muscle fatigue and cause sustained reoxygenation.