Wearable Defibrillator Electrode Patches for Continuous Skin Contact
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Solution Overview
Problem
Current wearable defibrillators are bulky, uncomfortable, and non-compliant, leading to patient non-adherence, and they often fail to correctly detect arrhythmias due to improper wear and lack of continuous skin contact, resulting in missed defibrillation opportunities.
Innovation Solution
A wearable defibrillator design with adhesive electrodes and fluid transport elements for continuous skin contact, capable of detecting arrhythmias and delivering shocks, designed for long-term wear, including a flexible circuitry and capacitors for energy delivery, with moisture-permeable layers for water resistance and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wearable defibrillators are made bulky to contain energy sources and control systems, then defibrillation capability is ensured, but patient comfort and compliance deteriorate
Solution Approach 1:
The wearable defibrillator is divided into multiple independent modules: adhesive electrode patches for cardiac monitoring and defibrillation, a separate wearable controller unit for signal processing, and modular energy storage components. This segmentation allows each component to be optimized independently - electrodes remain thin and comfortable while the controller provides full defibrillation capability when needed.
Solution Approach 2:
The electrode patches are designed with nested functional layers: conductive gel layer, adhesive layer, flexible substrate, and protective coating. The controller unit nests multiple subsystems including ECG amplifiers, arrhythmia detection algorithms, capacitor banks for energy storage, and wireless communication modules within a compact form factor that can be worn on the body.
2Device complexity
If wearable defibrillators use traditional non-adhesive electrodes, then device simplicity is maintained, but continuous skin contact and arrhythmia detection accuracy deteriorate
Solution Approach 1:
The adhesive electrode patches are designed to be applied by patients themselves to clean, dry skin surfaces. The adhesive material contains moisture-barrier properties that maintain continuous contact without requiring professional application or frequent adjustment, enabling self-service application while ensuring reliable arrhythmia detection.
Solution Approach 2:
The electrode patches utilize composite materials combining conductive hydrogel for electrical contact, pressure-sensitive adhesive for secure attachment, and flexible polymer substrates for conformability to body contours. This composite structure maintains continuous skin contact during movement and sweating, ensuring accurate arrhythmia detection without oversimplifying the device.
3Duration of action of moving object
If wearable defibrillators are designed for long-term continuous wear, then monitoring coverage is improved, but skin irritation and patient comfort deteriorate
Solution Approach 1:
The adhesive electrode patches incorporate porous hydrogel materials that allow breathability and moisture vapor transmission while maintaining electrical conductivity. The porous structure prevents sweat accumulation and reduces maceration of the skin, enabling continuous wear for extended periods without significant irritation while maintaining uninterrupted arrhythmia monitoring.
Solution Approach 2:
The adhesive material properties are engineered to change over time: initial high adhesion strength for secure attachment, gradually transitioning to moisture-managing properties as sweat accumulates. The adhesive contains humectants that maintain skin hydration and reduce irritation during prolonged wear, allowing continuous monitoring coverage while minimizing harmful effects on skin health.
4Device complexity
If wearable defibrillators lack water resistance, then device simplicity is maintained, but usability during showering and bathing deteriorates
Solution Approach 1:
The adhesive electrode patches and controller unit are designed with waterproof coatings and sealed connections that maintain continuous electrical contact and functionality during water exposure. The adhesive material itself provides water resistance, allowing patients to shower and bathe without removing the device, ensuring uninterrupted monitoring and defibrillation capability during daily activities.
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 design ensures continuous monitoring and reliable defibrillation, allowing patients to engage in daily activities without discomfort, reducing non-compliance and improving arrhythmia detection accuracy.
Implementation Method 1
a first fluid transport element configured to transport fluid away from the skin to allow the wearable external defibrillator to be worn continuously
Implementation Method 2
a first vapor permeable layer
Implementation Method 3
a first patient engagement substrate comprising an adhesive
Implementation Method 4
a first capacitor enclosed in a first capacitor housing comprising a first capacitor housing electrical connection and a second capacitor enclosed in a second capacitor housing comprising a second capacitor housing electrical connection, the first and second capacitors being in electrical communication with the energy source and the first defibrillator electrode pad and the second defibrillator electrode pad
Implementation Method 5
the controller configured to detect the cardiac signal with the first defibrillator electrode pad and the second defibrillator electrode pad
Implementation Method 6
the controller configured to detect the cardiac signal with the first defibrillator electrode pad and the second defibrillator electrode pad and to charge the one or more capacitors with the energy source followed by discharging the one or more capacitors to deliver a therapeutic shock through the first defibrillator electrode pad and the second defibrillator electrode pad to the patient
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A wearable external defibrillator comprising: a first defibrillator electrode pad configured to engage with a patient's skin, to detect cardiac signals, and to deliver an electrical therapy to the patient, the first defibrillator electrode pad configured to be in continuous contact with the patient's skin; a first patient engagement substrate comprising an adhesive, the first defibrillator electrode pad, a first fluid transport element configured to transport fluid away from the skin to allow the wearable external defibrillator to be worn continuously, and a first vapor permeable layer; a second patient engagement substrate comprising a second defibrillator electrode pad configured to engage with the patient's skin, to detect cardiac signals, and to deliver an electrical therapy to the patient, a second adhesive, a second fluid transport element in fluid communication with the second patient engagement substrate configured to transport fluid away from the skin to allow the wearable external defibrillator to be worn continuously, and a second vapor permeable layer; an energy source enclosed in an energy source housing comprising an energy source housing electrical connection; a first capacitor enclosed in a first capacitor housing comprising a first capacitor housing electrical connection and a second capacitor enclosed in a second capacitor housing comprising a second capacitor housing electrical connection, the first and second capacitors being in electrical communication with the energy source and the first defibrillator electrode pad and the second defibrillator electrode pad; a controller enclosed in a controller housing comprising a controller housing electrical connection, the controller configured to detect the cardiac signal with the first defibrillator electrode pad and the second defibrillator electrode pad and to charge the one or more capacitors with the energy source followed by discharging the one or more capacitors to deliver a therapeutic shock through the first defibrillator electrode pad and the second defibrillator electrode pad to the patient while the first and second patient engagement substrates are engaged with the patient; and a flexible circuitry adapted to receive the controller housing electrical connection, the energy source housing electrical connection, the first capacitor housing electrical connection, and the second capacitor housing electrical connection.