Dual-Module Motion Detection for Pacemaker Rate Adaptation
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Solution Overview
Problem
Current pacemakers, especially leadless ones, face challenges in energy efficiency due to continuous operation of motion detection systems, leading to unnecessary current consumption and reduced battery life, as they adapt heart rates based on physical activity without proper power management.
Innovation Solution
A dual-module motion detection system is introduced, where a continuously running first module with low current consumption detects analog motion signals, and an on-demand second module with a processor activates only during physical activity or predefined timers, significantly reducing power usage by turning off most of the time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motion detection system runs continuously to detect physical activity for rate adaptation, then the patient's metabolic demand is met timely, but the current consumption increases and battery life is reduced
Solution Approach 1:
The motion detection system is divided into two separate modules: a first module that continuously runs with low current consumption to detect basic motion signals, and a second module that runs only on demand with higher processing power. This segmentation allows the system to maintain responsive rate adaptation while significantly reducing overall power consumption during periods when full functionality is not needed.
Solution Approach 2:
The second module operates periodically rather than continuously, being activated only when the first module detects significant physical activity that requires full rate adaptation processing. This periodic operation pattern reduces current consumption while ensuring the system responds timely when needed.
2Reliability
If the second module operates continuously to ensure accurate rate adaptation, then the pacing rate meets metabolic demand, but the power consumption increases unnecessarily
Solution Approach 1:
The first module serves itself by continuously monitoring motion signals and autonomously determining when the second module needs to be activated. This self-service mechanism ensures the second module operates only when necessary for accurate rate adaptation, avoiding unnecessary power consumption during periods when basic monitoring suffices.
3Loss of information
If the motion detection system is always active to capture all physical activity signals, then no activity signals are missed, but the battery capacity is depleted faster
Solution Approach 1:
The first module acts as an intermediary between the sensor and the second module, filtering and pre-processing motion signals to determine when full processing is needed. This intermediary function ensures no significant activity signals are missed while avoiding the high power consumption of continuous second module operation.
Data Source
AI summary
An implantable cardiac pacemaker, wherein the pacemaker is configured to apply pacing pulses to the heart of a person during operation of the pacemaker, and wherein the pacemaker comprises a motion detection system that comprises a first module and a second module. The first module is configured to continuously run during operation of the pacemaker. The second module is configured to receive a trigger signal to change from an idle state to an active state or to receive a further trigger signal to change from an active state to an idle state. An energy consumption per time unit of the second module in the active state is larger than in the idle state. When the second module is in its active state, the second module is configured to execute a rate adaptation algorithm that adapts a rate of the pacing pulses to meet a metabolic demand of the person.