ICD Tachycardia Detection Using Segmented M-of-N and X-of-Y Criteria
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Solution Overview
Problem
Existing implantable cardioverter-defibrillators face challenges in efficiently differentiating between ventricular tachycardia and fibrillation, leading to potential delays in antitachycardia pacing therapy and unnecessary defibrillation shocks, which affects the reliability and timeliness of treatment.
Innovation Solution
Implementing distinct criteria for detecting ventricular tachycardia before applying antitachycardia pacing (ATP) therapy and antitachycardia defibrillation shocks, with separate M out of N and X out of Y criteria, allowing for adaptive charging of high voltage capacitors to prioritize effective ATP therapy while ensuring reliable detection before defibrillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single X out of Y criteria is used for tachycardia detection before both ATP and defibrillation shock, then the detection reliability is improved, but the response time for ATP therapy is delayed and unnecessary defibrillation shocks may be delivered
Solution Approach 1:
The patent divides the tachycardia detection criteria into two separate sets: an M out of N criteria for ATP therapy delivery and an X out of Y criteria for defibrillation shock delivery. This segmentation allows the system to use different detection thresholds for different therapeutic interventions, enabling faster ATP delivery while maintaining reliable defibrillation decision-making.
Solution Approach 2:
The patent applies different detection criteria qualities to different therapeutic pathways. The M out of N criteria is optimized for rapid ATP delivery with lower thresholds, while the X out of Y criteria is optimized for reliable defibrillation decisions with higher thresholds. Each criteria set has locally optimized parameters suited to its specific therapeutic purpose.
2Speed
If the high voltage capacitor is charged in advance for potential defibrillation shock, then the shock can be delivered immediately when needed, but energy is consumed unnecessarily if ATP therapy succeeds
Solution Approach 1:
The patent implements dynamic capacitor charging control where the charging decision is adjusted based on the detected arrhythmia characteristics and the specific therapeutic pathway being pursued. The system dynamically determines whether to charge the capacitor in advance or wait, optimizing the balance between rapid shock delivery capability and energy conservation based on real-time clinical needs.
Solution Approach 2:
The patent applies preliminary capacitor charging selectively based on the detection criteria outcome. When the M out of N criteria is met for ATP therapy, the system can choose not to charge the capacitor in advance, avoiding unnecessary energy consumption. The preliminary action (capacitor charging) is performed only when the clinical situation warrants potential defibrillation intervention.
3Device complexity
If a single detection criteria is used for both ATP and defibrillation shock, then the device complexity is reduced, but the treatment appropriateness and reliability are compromised
Solution Approach 1:
The patent segments the detection criteria into two distinct sets: M out of N for ATP therapy and X out of Y for defibrillation shock. This segmentation increases detection accuracy and treatment appropriateness by matching specific criteria to specific therapies, while the modular structure keeps the implementation complexity manageable through clear separation of functions.
Data Source
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AI summary
An implantable cardioverter-defibrillator system (10) with at least one or more stimulation units (1, 3, 5), one or more detection units (2), one or more control units (4), wherein the at least one control unit is connected to the at least one stimulation unit and to the least one detection unit, two or more electrode poles (6.1, 6.2, 6.3) for contact with body tissue and one or more high voltage capacitors (5) which may be charged by one or more charging units, wherein the at least one charging unit is connected to the at least one control unit.