Leadless Pacemaker VES Classification via Temporal Distance
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Solution Overview
Problem
Intracardiac medical devices, such as leadless pacemakers, face challenges in reliably identifying ventricular extrasystole (VES) events in real time due to reduced reliability in atrial input signaling and event detection.
Innovation Solution
The method involves a processing unit in the medical device that detects time-dependent electrical signals of the heart, including ventricular events, and classifies a current intrinsic ventricular event as a VES if the temporal distance from a directly preceding ventricular event meets pre-determined prematurity criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an implantable leadless pacemaker is used to miniaturize the device size, then the device can be placed within the heart chamber and reduce risks of regurgitation and infection, but the battery capacity is reduced and the ability to directly measure cardiac signaling from multiple heart chambers is eliminated
Solution Approach 1:
The patent segments the pacemaker functionality into modular components: a detector for sensing cardiac events, a processing unit for analyzing signals and determining pacing parameters, and a pacing unit for delivering stimuli. This segmentation allows the device to be miniaturized while maintaining essential functions through efficient integration of specialized sub-components within the constrained battery capacity.
Solution Approach 2:
The leadless pacemaker is designed to perform multiple functions within a single device: detecting cardiac events (both intrinsic and paced), classifying ventricular events as VES or non-VES, determining appropriate pacing parameters, and delivering pacing stimuli. This multi-functionality compensates for the reduced battery capacity by consolidating what would traditionally require separate leads and sensors into one integrated unit.
2Ease of manufacture
If the pacemaker resides wholly within a single heart chamber, then the device placement is simplified and risks are reduced, but the quality of atrial input signaling and event detection is reduced
Solution Approach 1:
The patent implements preliminary classification of ventricular events by comparing the temporal distance between consecutive ventricular events against prematurity criteria. This preliminary action occurs immediately upon detection of a ventricular event, allowing the system to identify VES events in real-time and adjust pacing parameters proactively before the next pacing cycle, compensating for reduced signal quality through predictive timing adjustments.
Solution Approach 2:
The system continuously monitors ventricular events and uses feedback from the classified event type (VES or non-VES) to dynamically adjust pacing parameters. When a VES is detected, the processing unit modifies subsequent pacing timing to maintain AV synchrony, creating a closed-loop control system that adapts to varying signal quality and maintains measurement precision despite the leadless configuration.
3Device complexity
If the pacemaker uses a fixed rate for pacing, then the device operation is simplified, but the ability to synchronize with the heart's intrinsic activity is reduced
Solution Approach 1:
The patent transitions from static fixed-rate pacing to dynamic rate adaptation by implementing real-time classification of ventricular events. The processing unit dynamically adjusts pacing parameters based on the temporal relationships between detected events, switching between fixed-rate and demand-pacing modes as needed. This dynamic behavior allows the pacemaker to maintain simplicity in normal operation while achieving reliable synchronization when intrinsic heart activity varies.
Data Source
AI summary
An intracardiac medical device comprising a processing unit and a detector configured to detect time-dependent electrical signals of the heart including ventricular events, for example an intracardiac electrogram, and to transmit the detected electrical signals to the processing unit, wherein the processing unit is configured to classify a current intrinsic ventricular event of the received electrical signals as a normal sense event or a ventricular extrasystole. The invention is further directed to an operation method of such medical device as well as a computer program product and a computer readable data carrier.