Dynamic Electrode Selection for Cardiac Pacing
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Solution Overview
Problem
The complexity of programmable parameter settings in advanced ambulatory medical devices, such as cardiac resynchronization therapy (CRT) devices, makes it difficult for caregivers to optimize therapy delivery, particularly in multi-site pacing scenarios where heart rate changes affect sensing time windows and electrode activation.
Innovation Solution
An apparatus with a stimulus circuit, switching circuit, and control circuit that dynamically adjusts electrode activation and timing based on heart rate, selectively removing or adding electrodes and modifying pacing modes to optimize sensing time windows and therapy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple electrodes are used for multi-site pacing therapy, then therapy delivery effectiveness is improved, but device complexity and programming difficulty increase
Solution Approach 1:
The patent implements dynamic electrode selection based on heart rate thresholds. The device automatically transitions between different electrode configurations (first set at lower heart rates, second set at higher heart rates) without requiring complex programming by the caregiver. This dynamic adaptation resolves the contradiction by maintaining effective multi-site pacing while simplifying the programming interface.
Solution Approach 2:
The patent divides the pacing therapy into different modes corresponding to different heart rate ranges. Each mode uses a specific set of electrodes optimized for that heart rate range. This segmentation allows the device to maintain simplicity in programming while providing effective multi-site pacing when needed, as each segmented mode has predetermined electrode settings.
2Ease of operation
If electrode activation is fixed, then device operation is simple, but sensing time windows may be insufficient at varying heart rates
Solution Approach 1:
The patent makes electrode activation dynamic by linking it to heart rate detection. The device automatically selects appropriate electrode sets based on real-time heart rate measurements, ensuring adequate sensing time windows across varying heart rates while maintaining ease of operation through automated control.
Solution Approach 2:
The patent incorporates feedback from heart rate sensing to control electrode selection. The device continuously monitors heart rate and uses this feedback to determine which electrode set to activate, ensuring optimal sensing performance without requiring complex manual programming.
3Productivity
If heart rate increases, then therapy demand increases, but fixed electrode configurations may cause missed intrinsic cardiac activity detection
Solution Approach 1:
The patent implements dynamic electrode configuration changes in response to heart rate increases. When heart rate exceeds a threshold, the device switches to a second set of electrodes with different timing characteristics that are better suited for higher heart rates, thereby maintaining both therapy delivery efficiency and accurate detection of intrinsic cardiac activity.
Data Source
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AI summary
An apparatus for coupling to a plurality of electrodes implantable at a plurality of tissue sites of a heart chamber of a subject. The apparatus including a stimulus circuit configured to provide an electrical cardiac pacing stimulation to the plurality of electrodes, a switching circuit configured to select electrodes of the plurality of electrodes for electrical coupling to the stimulus circuit, and a control circuit including a heart rate sub-circuit configured to determine heart rate; and a pacing site activation sub-circuit configured to selectively change which electrodes of the plurality of electrodes are used to provide the electrical cardiac pacing stimulation therapy according to the determined heart rate.