Adaptive Alarm Controller for Wearable Medical Devices
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Solution Overview
Problem
Wearable medical devices often fail to effectively alert patients to critical cardiac abnormalities, particularly when they are asleep, leading to potential unnecessary therapeutic shocks or device inoperability due to battery depletion.
Innovation Solution
A wearable medical device controller with a processor that detects cardiac abnormalities and the patient's sleep state, issuing adaptive alarms via electrodes, including shocks with currents between 1 mA and 20 mA, and sequencing pacing pulses according to sub-threshold or overdrive pacing processes, with subsequent defibrillating shocks if no response is received within a target time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wearable medical device issues standard alarms to notify patients of cardiac abnormalities, then the device can alert patients of critical events, but the alarms are ineffective when patients are asleep and may lead to unnecessary therapeutic shocks
Solution Approach 1:
The alarm system dynamically adapts its characteristics based on detected patient state. When the processor detects the patient is asleep through motion sensors or physiological monitoring, it automatically modifies the alarm delivery parameters, such as increasing intensity, changing modality (e.g., from auditory to tactile), or repeating the alarm sequence, thereby maintaining effectiveness despite the patient's reduced awareness
Solution Approach 2:
The system changes physical parameters of the alarm signal based on patient response and state. This includes adjusting amplitude, frequency, duration, or type of stimulation delivered through electrodes, transforming a static alarm system into one that continuously optimizes its output parameters to ensure patient awareness while avoiding false escalation to therapeutic shock
2Reliability
If the wearable medical device repeatedly notifies patients of low battery status, then the device can alert patients to power issues, but the repeated notifications may cause the device to become inoperative due to battery depletion
Solution Approach 1:
Instead of continuous or frequent repeated notifications, the system implements periodic alarm delivery with strategically spaced intervals. The processor monitors battery status and delivers notifications at optimized intervals that balance patient awareness with power conservation, preventing battery depletion while ensuring critical alerts are received
Solution Approach 2:
The system monitors its own power status and autonomously adjusts its notification behavior to preserve battery life. When low battery is detected, the processor automatically modifies the frequency and intensity of subsequent alarms, creating a self-regulating system that prioritizes maintaining device operability while still fulfilling its alerting function
3Reliability
If the wearable medical device issues strong alarms to ensure patient awareness, then the device can alert sleeping patients effectively, but the strong alarms may startle patients or cause unnecessary anxiety
Solution Approach 1:
The alarm system dynamically adjusts its intensity and characteristics based on real-time patient state detection. When a patient is detected as asleep, the system initially delivers gentler alerts and only escalates to stronger stimulation if no response is detected within a predetermined time window, thereby ensuring awareness while minimizing unnecessary stress
Solution Approach 2:
The system performs preliminary detection of patient state (awake vs. asleep) before delivering the full alarm sequence. By first assessing whether the patient is responsive or unconscious through motion sensors or physiological monitors, the device can tailor the alarm intensity appropriately, avoiding overwhelming stimulation of awake patients while ensuring adequate alerting of unconscious patients
Data Source
AI summary
In one example, an external medical device is provided. The external medical device includes a memory, at least one sensor to detect a cardiac condition in a patient monitored by the external medical device, and circuitry, in communication with the memory, to receive information indicative of the cardiac condition, detect whether the patient is asleep, and issue at least one alarm responsive to both receiving the information and detecting that the patient is asleep.