Charging Circuit Modulation for IMD Pulse Waveform Control
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Solution Overview
Problem
The process of confirming the effectiveness of implantable medical devices (IMDs) for arrhythmia detection and defibrillation is time-consuming and resource-intensive, requiring repeated induction and testing of arrhythmia, which can be inefficient and energy-consuming.
Innovation Solution
The modulation of a charging circuit in subcutaneous or substernal implantable medical devices (SIMDs) to regulate the generation of charge current for stimulation pulse waveforms, allowing real-time adjustment during delivery and reducing energy losses, thermal stress, and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated arrhythmia induction and testing is performed to confirm IMD effectiveness, then reliable defibrillation capability is verified, but time consumption and resource usage increase significantly
Solution Approach 1:
The patent performs threshold testing during the implantation procedure itself, before the device is fully deployed into clinical service. By conducting arrhythmia induction and defibrillation threshold verification as a preliminary action during implantation, the system establishes reliable device performance upfront, eliminating the need for multiple subsequent testing sessions and reducing overall time loss.
Solution Approach 2:
The IMD automatically induces arrhythmia using its own electrical stimulation capabilities and autonomously performs defibrillation threshold testing without requiring continuous external clinician intervention. The device self-manages the testing protocol, executing arrhythmia induction sequences and evaluating its own response characteristics, thereby reducing resource consumption associated with manual testing procedures.
2Reliability
If high energy pulses are delivered repeatedly during threshold testing, then defibrillation effectiveness is confirmed, but internal energy reserves are depleted
Solution Approach 1:
The patent implements a staged pulse delivery protocol where the IMD begins with lower energy pulses and progressively increases amplitude only if arrhythmia persists. Rather than immediately delivering maximum energy pulses, the system applies partial action with incremental escalation, confirming defibrillation capability while minimizing unnecessary energy consumption from high-amplitude pulses.
Solution Approach 2:
The system continuously monitors cardiac rhythm during threshold testing and uses this feedback to dynamically adjust pulse delivery parameters. When arrhythmia is successfully terminated, the IMD receives feedback and immediately ceases further high-energy pulse delivery. This feedback-driven control ensures defibrillation effectiveness is confirmed with the minimum necessary energy expenditure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach facilitates more efficient and effective threshold testing for IMDs, reducing the time and resources required for confirmation and minimizing energy consumption, while also reducing the complexity of the output circuit.
Implementation Method 1
modulation of a charging circuit in subcutaneous or substernal implantable medical devices (SIMDs) to regulate the generation of charge current for delivery of a stimulation pulse waveform
Data Source
AI summary
Techniques are disclosed for modulating the generation of charge current by operational circuitry included in an implantable medical device (IMD) for delivery of an induction stimulation pulse waveform by the IMD. The modulation may include modulating a charging circuit of the operational circuitry to facilitate the regulation of the induction stimulation pulse waveform. The techniques include monitoring an electrical parameter of a charging path during the delivery of the induction stimulation pulse and modulating the charging circuit based on the monitored electrical parameter.