Trigger-Specific IEGM Recording in Implantable Cardiac Devices
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Solution Overview
Problem
Current implantable medical devices are limited in their ability to selectively record intracardiac electrograms (IEGMs) in response to different diagnostic triggers, leading to unnecessary data storage and memory constraints, as they typically record all selected IEGMs upon detection of any trigger, rather than allowing trigger-specific recording of cardiac signal data.
Innovation Solution
The implementation of a method in implantable medical devices to store and record different types of IEGMs based on specific diagnostic triggers, allowing physicians to select which IEGMs to record in response to various triggers, such as atrial or ventricular arrhythmias, thereby reducing unnecessary data storage and enhancing diagnostic flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all selected IEGMs are recorded in response to any trigger, then complete diagnostic data is captured, but memory usage increases and storage efficiency decreases
Solution Approach 1:
The patent segments the recording process by creating separate memory buffers for different trigger types (atrial triggers, ventricular triggers, and both). Each buffer stores only the IEGMs relevant to its specific trigger type, allowing selective retrieval based on the detected trigger without storing all possible IEGM combinations in full detail.
Solution Approach 2:
The patent applies local quality by making different parts of the memory system serve different purposes: dedicated buffers for atrial-triggered IEGMs, dedicated buffers for ventricular-triggered IEGMs, and a combined buffer for triggers requiring both. This localized organization optimizes storage efficiency for each specific diagnostic need.
2Quantity of substance
If trigger-specific recording is implemented, then memory efficiency improves and storage is optimized, but device complexity increases
Solution Approach 1:
The patent implements dynamic control by using a programmable microcontroller that can be configured through external programming to select which IEGM channels are recorded in response to which triggers. This dynamic configurability allows the device to adapt to different diagnostic requirements without requiring multiple hardwired recording paths for each possible trigger-combination.
Solution Approach 2:
The patent creates a universal recording framework where a single set of sensing circuits and a single microcontroller handle multiple trigger types and multiple IEGM channel combinations. The system can be programmed to record different IEGM sets for atrial triggers, ventricular triggers, or combined triggers, making one system perform multiple specialized functions.
Data Source
AI summary
Techniques are provided for controlling the recording of intracardiac electrograms (IEGMs) within an implantable medical device such as a pacemaker, wherein the device is capable of recording different channels of IEGMs in response to different diagnostic triggers. Exemplary triggers include pacemaker-mediated tachycardia; atrial tachycardia, atrial fibrillation, ventricular tachycardia, etc. In one example, the device stores, for each diagnostic trigger, a physician selection of particular IEGMs to be recorded for subsequent review. Then, whenever a trigger is detected, the device senses and records only the particular IEGMs that had been selected by the physician for that particular trigger. The IEGMs are eventually transmitted to an external programmer for review. In this manner, the physician can specify particular IEGMs to be stored in response to particular diagnostic triggers, thereby providing considerable diagnostic flexibility, while also conserving memory. Triggers can be classified as atrial-related or ventricular-related, with appropriate IEGMs stored. Pre-trigger IEGM storage can also be accommodated.