Pacing Device Stability Check for Loss of Capture Detection
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Solution Overview
Problem
Miniaturized pacing devices, such as leadless pacemakers, face challenges in reducing battery drain while maintaining capture, as current devices often use large safety margins that increase the risk of loss of capture and reduce battery life.
Innovation Solution
A mechanism is introduced to identify potential loss of capture by employing a stability check that monitors asynchronous underlying rhythms, allowing for adjustment of pacing output to the lowest safe voltage and initiating capture management tests, thereby reducing power consumption and increasing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large safety margins are used in pacing output, then capture reliability is improved, but battery life is reduced
Solution Approach 1:
The patent implements dynamic adjustment of pacing output parameters based on real-time capture status monitoring. The device transitions from static large safety margins to dynamic parameter adjustment, reducing power consumption when capture is confirmed while maintaining reliability when needed.
Solution Approach 2:
The patent employs feedback mechanisms through capture management tests and stability checks that continuously monitor pacing effectiveness. Based on this feedback, the device adjusts output parameters to minimize battery drain while ensuring capture reliability is maintained.
2Reliability
If capture management tests are performed frequently, then loss of capture detection is improved, but power consumption is increased
Solution Approach 1:
The patent implements periodic stability checks and capture management tests rather than continuous monitoring. The device performs tests at scheduled intervals or when specific conditions are met, reducing power consumption while maintaining effective loss of capture detection capability.
Solution Approach 2:
The device uses its own sensing capabilities to monitor capture status and trigger tests only when necessary, rather than continuously consuming power for external monitoring systems.
3Duration of action of stationary object
If pacing output is reduced to lowest safe voltage, then battery life is extended, but capture reliability may be compromised
Solution Approach 1:
The patent performs preliminary capture management tests before reducing pacing output to the lowest safe voltage. This ensures that the reduced output is still sufficient for reliable capture, allowing battery life extension without compromising capture reliability.
Solution Approach 2:
The device dynamically changes pacing parameters based on captured tissue response and stability check results. When capture is confirmed at lower voltages, the device transitions to energy-saving operation; when capture fails, parameters are automatically adjusted upward.
Data Source
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AI summary
An apparatus for identifying loss of capture in a pacing device. While pacing pulses are being delivered, the device checks for emergence of a stable asynchronous underlying intrinsic rhythm in the presence of the delivered pacing pulses. The device determines that loss of capture has occurred responsive to emergence of the underlying rhythm. In response to determining that loss of capture has occurred, pacing provided by the device is modified, for example by performing a threshold test and adjusting the energy levels of delivered pacing pulses in response thereto.