Wearable Defibrillator Electrode Thermal Management
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Solution Overview
Problem
Wearable medical devices, such as wearable cardioverter defibrillators, often cause discomfort due to increased temperature at or near sensor and electrode contact points, leading to reduced wearability and potentially life-threatening therapy disruptions.
Innovation Solution
Incorporation of temperature control systems, specifically Peltier cooling devices, to maintain the temperature of support structures and sensors in proximity to the patient's body, ensuring comfort and prolonged wearability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If temperature control systems are added to wearable medical devices, then comfort and wearability are improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing temperature control specifically at the electrode-skin interface rather than throughout the entire device. Peltier cooling elements are positioned only where electrodes contact the skin, providing localized thermal management to the critical area while leaving the rest of the device structure simple and uncomplicated.
Solution Approach 2:
The patent uses gel packs as intermediary elements between the Peltier cooling devices and the skin surface. These gel packs serve as thermal mediators that distribute the cooling effect evenly across the electrode contact area, enhancing comfort while isolating the complex mechanical components from direct skin contact.
2Object-affected harmful factors
If Peltier cooling devices are used to control electrode temperature, then discomfort is reduced, but energy consumption increases
Solution Approach 1:
The patent implements periodic cooling cycles rather than continuous operation. The control system monitors skin temperature at the electrode interface and activates Peltier cooling devices only when temperature exceeds a predetermined threshold, allowing passive heat dissipation during cooler periods and reducing overall energy consumption while maintaining comfort.
Solution Approach 2:
The patent incorporates temperature sensing feedback mechanisms that continuously monitor the thermal state at the electrode-skin interface. This feedback information is used by the control system to dynamically adjust Peltier cooling device operation, activating cooling only when and where needed, thereby minimizing energy consumption while effectively managing discomfort.
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 temperature control system effectively reduces discomfort, enhances wearability, and maintains the functionality of wearable medical devices by keeping the temperature at or near body temperature, thereby ensuring continuous therapy delivery.
Implementation Method 1
Incorporation of temperature control systems, specifically Peltier cooling devices, to maintain the temperature of support structures and sensors in proximity to the patient's body
Data Source
AI summary
A wearable cardioverter defibrillator (WCD) system is configured to selectively provide cooling and/or heating to a component of the WCD system. In some embodiments, a Peltier device is used to provide the cooling to wearer of the WCD at or near where the WCDs defibrillation electrodes are positioned proximate or contacting the patient's body.