Wearable Defibrillator Battery Swap via Voice Prompt
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Solution Overview
Problem
Wearable cardioverter defibrillators (WCDs) face challenges in ensuring continuous battery charging, leading to potential device malfunction during emergencies, as existing systems lack effective mechanisms to monitor and manage battery levels, particularly when patients are unable to swap or recharge batteries conveniently.
Innovation Solution
The implementation of a wearable medical system (WMS) that includes a charger communicating battery levels to the unit, prompting users when a battery is low or not being recharged, and utilizing a reserve battery system to maintain readiness for emergencies, allowing for timely swapping and minimizing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a WCD uses a single rechargeable battery system, then the device structure is simple, but the reliability is compromised when the battery is depleted and cannot be recharged in time
Solution Approach 1:
The battery system is segmented into multiple independent rechargeable batteries instead of using a single battery. This allows one battery to be in use while another is being recharged, ensuring continuous device readiness without requiring complex power management circuitry for a single large battery.
Solution Approach 2:
The system performs preliminary charging actions by maintaining a reserve battery that is charged in advance. When the active battery is depleted, the pre-charged reserve battery can immediately take over, eliminating downtime without requiring complex real-time power management.
2Reliability
If the WCD system monitors battery levels continuously, then the reliability is improved, but the device complexity increases due to additional monitoring components
Solution Approach 1:
The system implements feedback by having the charger communicate battery level information back to the WCD unit. This allows the unit to monitor battery status without requiring complex internal monitoring circuitry, as the charger performs the measurement and reports back.
Solution Approach 2:
The charger acts as an intermediary that performs the battery level measurement and communication function. Instead of the WCD unit directly monitoring battery levels (which would require complex circuitry), the charger serves as a mediator that handles the monitoring and informs the unit.
3Ease of operation
If the WCD uses voice prompts to alert patients about battery status, then the ease of operation is improved for patients unable to check displays, but the device complexity increases due to audio output components
Solution Approach 1:
The system provides self-service notification by automatically generating and playing voice prompts when battery levels are low. The patient does not need to manually check battery status or interpret display indicators; the system serves itself by actively communicating its status through audio alerts.
Data Source
AI summary
A wearable medical systems (“WMS”) implements a wearable cardioverter defibrillator (“WCD”) by including therapy electrodes coupled to a unit with electronic components, all of which are carried or worn by a patient. A charger is also provided, along with at least two rechargeable batteries; one of the batteries can be powering the unit while the other is being recharged by the charger. The unit may output a prompt to the patient to swap the batteries when the battery in the unit reaches a low-charge condition, or when other conditions are met.