Electroactive Compression Bandage with Pressure Transition System
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Solution Overview
Problem
Current methods for applying external pressure to human body parts, such as those used in treating lymphoedema, are inefficient, uncomfortable, and can cause skin damage due to static pressure, inaccuracy in pressure measurement, and limited mobility during treatment.
Innovation Solution
A device with a pressure transition system that redistributes pressure between segments using electroactive materials and actuators, allowing for flexible, controlled, and smoothed-out pressure profiles, enabling comfortable and effective treatment across joints and complex body regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pneumatic compression pump devices are used to dynamically pressurize limbs, then lymphatic fluids can be pumped effectively and proteins can be broken up, but the devices are relatively inefficient, cannot operate from batteries for significant length of time, require connection to mains power, require patient to be stationary, accumulate heat making them uncomfortable for long durations, are noisy, and air-pressure measurements can be inaccurate
Solution Approach 1:
The patent replaces the pneumatic compression system with an electroactive polymer-based actuation system. The electroactive polymer materials directly convert electrical energy to mechanical deformation, eliminating the need for pneumatic pumps, air chambers, and complex mechanical transmission systems. This substitution enables the device to be powered by batteries for extended periods without requiring connection to mains power.
Solution Approach 2:
The patent changes the fundamental operating parameters by using electroactive polymers that can be precisely controlled through electrical signals. The pressure application is controlled by varying the electrical voltage applied to the electroactive polymer segments, allowing for accurate pressure control without relying on air-pressure measurements. The system can operate at low power consumption levels suitable for battery operation.
2Shape
If multi-layered lymphatic bandages are applied to reshape limbs, then the limb can be compressed and proteins can be broken up with patient movement, but the bandages must be custom made, require frequent adjustment, are bulky and hot to wear, cannot be worn under clothing, and cannot actively pressurize the body
Solution Approach 1:
The patent uses electroactive polymer films as thin, flexible active compression elements that can be integrated into a streamlined garment structure. These thin film actuators replace the need for multiple thick passive layers while providing active pressure control. The flexible nature of the electroactive polymer films allows the device to conform to body contours without being bulky.
Solution Approach 2:
The patent transforms the static compression approach into a dynamic system where electroactive polymer segments can actively adjust pressure in real-time based on control signals. This dynamic capability allows the system to adapt to changing limb dimensions and treatment requirements without requiring frequent manual adjustments by caregivers.
3Stress or pressure
If elastic compression bandages are used to statically pressurize an afflicted limb, then a graduated pressure can be applied with highest pressure at distal end, but the pressure application is static, requires qualified person to apply, and pressure decreases as limb changes size and bandages creep
Solution Approach 1:
The patent implements dynamic pressure adjustment capability through electroactive polymer segments that can be controlled independently. The system can adapt the pressure distribution over time in response to changes in limb size, movement, or treatment requirements, eliminating the static nature of traditional elastic bandages. This allows the pressure profile to be maintained or modified without requiring reapplication by a qualified person.
Solution Approach 2:
The patent incorporates sensors that monitor pressure, limb dimensions, and physiological parameters, feeding this information back to a control system. The control system adjusts the electroactive polymer actuation in real-time to maintain the desired graduated pressure distribution, compensating for limb size changes and ensuring treatment effectiveness throughout the wear period.
4Productivity
If pneumatic compression pump devices apply high pressure to reduce oedema, then dramatic reduction can be achieved during treatment, but unintentionally high pressure levels may harm the patient and require static compression bandages after use to prevent fluid drainage back
Solution Approach 1:
The patent uses integrated sensors to continuously monitor the pressure applied to the limb and physiological parameters. This feedback information is used by the control system to adjust the electroactive polymer actuation in real-time, ensuring pressure remains within safe and effective ranges. The system can detect and respond to changes in tissue condition, preventing unintentionally high pressure levels that could cause skin damage.
Solution Approach 2:
The patent employs cyclic compression patterns where the electroactive polymer segments apply pressure in controlled cycles rather than continuous static pressure. This periodic action mimics natural physiological rhythms and allows tissue time to respond and recover between compression cycles, reducing the risk of damage while maintaining treatment effectiveness. The system can vary the cycle frequency and duration based on treatment stage and patient response.
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 solution provides well-controlled, flexible pressure profiles that enhance patient comfort and treatment efficacy, particularly in areas difficult to treat with traditional methods, while being power-efficient and adaptable to individual needs.
Implementation Method 1
Each segment contains a controllable active-material based actuator, e.g. of electroactive polymer, conducting-polymer, carbon-nanotube or electroactive-gel type
Implementation Method 2
a pressure transition system, which is located relative to the body part, the first and second segments and has such mechanical properties that the pressure transition system is adapted to redistribute the basic pressure profiles between the first and second segments
Data Source
AI summary
The proposed device includes two segments adapted to enclose a body part in a form-fitting manner. Each segment contains an electroactive-material-based actuator, which is adapted to receive an electrical control signal and in response thereto adjust the actuator's morphology, so as to cause the segment to apply a basic pressure profile to the body part. A pressure transition is adapted to redistribute the basic pressure profiles between the first and second segments. A control signal in respect of the first segment causes the pressure transition system to apply a first adjusted pressure profile to at least part of the second portion of the body part, and vice versa, a control signal in respect of the second segment causes the pressure transition system to apply a second adjusted pressure profile to at least a part of the first portion of the body part.