Layered Electro-Stimulating Dressing for Pressure Ulcer Prevention
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Solution Overview
Problem
Current solutions for preventing pressure ulcers, particularly those involving electrostimulation, are ineffective, cumbersome, and require regular supervision by a qualified person due to issues with electrode application and skin resistance changes.
Innovation Solution
A layered electro-stimulating dressing with a substrate, absorption layer, electro-stimulating layer, and a generation system for generating stimulating signals, including a control system, power supply, and sensors for impedance and pressure measurement, which allows for automatic signal generation and adjustment based on patient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostimulation is applied to prevent pressure ulcers, then muscle stimulation effectiveness is improved, but device complexity and need for regular supervision increase
Solution Approach 1:
The patent combines multiple functions into a single integrated dressing: the substrate provides both mechanical support and electrode contact, the absorption layer manages moisture while maintaining electrical contact, and the layered structure eliminates the need for separate electrode application devices. This integration reduces device complexity while maintaining prevention effectiveness.
Solution Approach 2:
The dressing serves multiple functions simultaneously: mechanical pressure distribution, electrostimulation delivery, moisture absorption, and skin protection. This multi-functionality eliminates the need for separate devices for each function, reducing overall system complexity and the need for regular supervision.
2Ease of operation
If electrostimulation parameters are adjusted to be tolerable, then patient comfort is improved, but stimulation effectiveness may be reduced
Solution Approach 1:
The patent specifies optimized parameter ranges: current (4-100 mA), duration (50 μs to 2.5 ms), and repetition rate (10-60 Hz). These parameters are carefully selected to fall within the threshold of perceptibility (below 60 mA) while maintaining effective muscle stimulation, thus achieving both patient comfort and therapeutic effectiveness.
Solution Approach 2:
The electrostimulation is delivered in periodic impulses with controlled duration and repetition rates rather than continuous stimulation. This periodic delivery allows muscle fibers to relax between impulses, reducing patient discomfort while maintaining effective muscle contraction and prevention of pressure ulcers.
3Reliability
If skin resistance changes are monitored to maintain stable electrostimulation, then stimulation stability is improved, but measurement and control complexity increase
Solution Approach 1:
The patent incorporates sensors that continuously monitor skin resistance and electrostimulation parameters, feeding this information back to a control system that automatically adjusts stimulation delivery. This feedback mechanism maintains stable electrostimulation despite changes in skin condition without requiring complex manual monitoring or intervention.
Solution Approach 2:
The dressing incorporates autonomous monitoring and adjustment capabilities through integrated sensors and control systems that automatically adapt to changing skin conditions. This self-service functionality eliminates the need for external monitoring equipment or regular manual adjustment by medical personnel.
4Reliability
If a pressure distribution mechanism is added to prevent tissue degeneration, then prevention effectiveness is improved, but device complexity increases
Solution Approach 1:
The substrate is designed to perform dual functions: providing structural support for the layered dressing and simultaneously distributing pressure across the patient's skin. This integration of mechanical support and pressure distribution functions into a single component adds minimal complexity while significantly improving prevention effectiveness.
Solution Approach 2:
The patent uses a layered composite structure combining different materials with complementary properties: the substrate provides mechanical strength, the gel layer provides pressure distribution and electrical contact, and the absorption layer manages moisture. This composite approach achieves multiple protective functions through material properties rather than additional mechanical components.
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 dressing effectively prevents pressure ulcers by providing tolerable and effective electrostimulation, reducing tissue degeneration, and minimizing infection risk, while allowing for autonomous operation without constant medical supervision.
Implementation Method 1
The substrate constitutes a pressure distribution layer made of a gel having hyperplastic properties
Implementation Method 2
The absorption layer absorbs discharges and limits a risk of infections
Implementation Method 3
the generator is adapted for generating stimulating signals comprising impulses with an electric current
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3e
AI summary
A layered electro-stimulating dressing comprising a substrate, an absorption layer (2) and an electro- stimulating layer (3) comprising a first electrode (31) and a second electrode (32), according to the invention is characterized in that first electrode (31) and the second electrode (32) are connected to the generation system (5) of stimulating signals, which is provided with a control system (51), a power supply system (52) connected to it and a generator (53). A substrate constitutes a pressure distribution layer (1), whereas the generator (53) is adapted for generating stimulating signals with electric current falling within the range of 4 mA to 100 mA and duration falling within the range of 50 µs to 2.5 ms, with repetition rate falling within the range of 10 Hz to 60 Hz. A method of electrostimulation according to the invention is characterized in that it is performed automatically by the means of a dressing according to the invention.