Multi-Electrode Stimulation Vector Capture Threshold Determination
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Solution Overview
Problem
The complexity of programming multi-site electrical stimulation therapy for implantable medical devices, particularly in determining optimal parameter values for combined electrode stimulation vectors, poses a challenge in ensuring effective therapy while minimizing energy consumption and avoiding battery compromise.
Innovation Solution
An apparatus comprising a stimulus circuit, a switch circuit, and a control circuit that configures a stimulation vector with a first vector electrode and multiple other electrodes, determining individual capture stimulation thresholds to calculate the capture threshold of the combined vector, thereby optimizing energy delivery and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple electrodes are combined to form a stimulation vector for multi-site pacing, then therapy efficacy is improved through simultaneous stimulation of multiple cardiac sites, but programming complexity increases due to the need to determine optimal parameter values for each electrode combination
Solution Approach 1:
The IMD automatically determines capture thresholds for combined electrode vectors without requiring manual programming by the clinician. The device performs self-testing by delivering stimulation pulses and detecting capture status, then automatically programs the optimal stimulation parameters for multi-site pacing vectors, eliminating the complexity of manual parameter optimization while maintaining therapy efficacy
Solution Approach 2:
The system performs preliminary determination of capture thresholds for each electrode combination before actual therapy delivery. By pre-characterizing the electrical properties of each possible stimulation vector through automated testing, the device prepares all necessary parameter data in advance, allowing complex multi-site pacing to be implemented without requiring the clinician to manually optimize each parameter during programming
2Measurement precision
If capture threshold determination is performed for each individual electrode in a combined vector, then accurate stimulation parameters are obtained for optimal therapy, but energy consumption increases due to extensive testing requirements
Solution Approach 1:
The system determines capture thresholds for individual electrodes within a combined vector, which is more detailed than necessary for basic function but provides precise parameter optimization. This partial determination approach tests only the essential individual electrode thresholds rather than all possible combinations, achieving sufficient measurement precision while limiting energy consumption to acceptable levels
Solution Approach 2:
The device changes stimulation parameters systematically during threshold determination, testing different voltage amplitudes and pulse widths to identify the capture threshold for each electrode. By methodically varying these electrical parameters and detecting capture status at each level, the system obtains accurate threshold values while managing the total number of tests to control energy consumption during the characterization process
Data Source
AI summary
An apparatus comprises a stimulus circuit, a switch circuit, and a control circuit. The stimulus circuit is configured to provide electrical pulse stimulation to the plurality of electrodes. The switch circuit is configured to electrically couple different combinations of the electrodes to the stimulus circuit. The control circuit is to configure a stimulation vector that includes a first vector electrode and a plurality of other electrodes electrically coupled together to form a second combined vector electrode. The control circuit includes a capture detection sub-circuit configured to determine individual capture stimulation thresholds between the first vector electrode and each single electrode of the combined vector electrode. The control circuit is configured to determine a capture stimulation threshold of the stimulation vector using the determined individual capture thresholds.