Ventricular Pacemaker Rate Smoothing for Atrial Synchronization
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Solution Overview
Problem
Existing intracardiac ventricular pacemakers struggle to provide reliable atrial-synchronized ventricular pacing due to the difficulty in consistently detecting atrial events from cardiac electrical signals, particularly when electrodes are placed solely in the ventricular chamber, leading to potential interference and asynchronous pacing.
Innovation Solution
An intracardiac ventricular pacemaker that utilizes a motion sensor, such as an accelerometer, to detect atrial systolic events and adjusts ventricular pacing pulses using a rate smoothing interval based on actual ventricular rate intervals, ensuring synchronization with atrial events without requiring additional atrial chamber electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If intracardiac ventricular pacemaker electrodes are placed solely in the ventricular chamber, then the device complexity is reduced, but the reliability of detecting atrial events deteriorates
Solution Approach 1:
The patent uses ventricular electrical signals as an intermediary to indirectly detect atrial events. The ventricular pacemaker senses ventricular depolarization signals and identifies atrial events through the atrioventricular relationship, allowing atrial event detection without direct atrial electrode contact. This mediator approach resolves the contradiction by enabling reliable atrial event detection through ventricular chamber electrodes alone.
2Productivity
If ventricular pacing pulses are delivered without rate smoothing, then the productivity of pacing delivery is improved, but the synchronization with atrial events deteriorates
Solution Approach 1:
The patent implements dynamic rate smoothing by adjusting the ventricular pacing interval based on detected atrial events. When an atrial event is detected, the pacemaker dynamically modifies the ventricular pacing timing to maintain optimal atrioventricular synchrony. This dynamic adjustment resolves the contradiction by adapting the pacing delivery to maintain synchronization while preserving overall pacing efficiency.
3Reliability
If the pacemaker waits for atrial event detection before delivering ventricular pacing, then the synchronization with atrial events is improved, but the loss of time for pacing delivery increases
Solution Approach 1:
The patent applies preliminary action by pre-setting the ventricular pacing interval based on the detected atrial event. Upon detecting an atrial event, the pacemaker immediately initiates a predetermined ventricular pacing interval, allowing the ventricular pacing pulse to be delivered at the optimal time without excessive delay. This resolves the contradiction by preparing the pacing delivery in advance while maintaining synchronization.
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
Enhances the synchronization of ventricular pacing with atrial events, improving heart rhythm maintenance by reducing asynchronous pacing and increasing the likelihood of atrial event detection, thus promoting a more normal heart rhythm without the need for additional atrial chamber electrodes.
Implementation Method 1
Atrial events may be sensed from a motion sensor signal
Data Source
AI summary
A ventricular pacemaker is configured to determine a ventricular rate interval by determining at least one ventricular event interval between two consecutive ventricular events and determine a rate smoothing ventricular pacing interval based on the ventricular rate interval. The pacemaker is further configured to detect an atrial event from a sensor signal and deliver a ventricular pacing pulse in response to detecting the atrial event from the sensor signal. The pacemaker may start the rate smoothing ventricular pacing interval to schedule a next pacing pulse to be delivered upon expiration of the rate smoothing ventricular pacing interval.