Leadless Dual-Chamber Pacing via Event Message Coordination
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Solution Overview
Problem
Current implantable medical devices (IMDs) face limitations such as venous stenosis, thrombosis, device-related endocarditis, and limited functional capability, particularly with leadless pacemakers (LPs) that are restricted to single-chamber functionality and risk premature ventricular excitations when coordinating pacing between chambers.
Innovation Solution
A system and method for coordinating pacing between first and second implantable medical devices (IMDs) using event messages to arm the second IMD to generate pacing pulses for a predetermined number of consecutive cardiac cycles, allowing for synchronized cardiac stimulation across different heart chambers without inducing premature ventricular excitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LP devices are implanted to provide dual-chamber pacing capability, then functional capability is improved, but the risk of premature ventricular excitations increases due to strict master/slave coordination requirements
Solution Approach 1:
The patent applies preliminary action by having the master LP device transmit an arm command to the slave LP device in advance, before the slave device actually delivers the pacing pulse. This allows the slave device to be prepared and synchronized without requiring strict real-time coordination during the vulnerable ventricular period, thereby reducing the risk of premature ventricular excitations while maintaining dual-chamber pacing functionality
2Reliability
If leadless pacemakers are used to avoid lead-related complications, then reliability is improved by eliminating venous stenosis and thrombosis risks, but functional capability is limited to single-chamber operation
Solution Approach 1:
The patent merges the functionality of multiple leadless pacemaker devices by enabling wireless communication and coordination between a master LP device and one or more slave LP devices. This combination allows the system to achieve dual-chamber or even tri-chamber pacing capability while maintaining the reliability advantages of leadless design, as each individual device remains leadless but works cooperatively as a unified system
3Stability of the object's composition
If strict master/slave coordination is used between multiple LP devices, then pacing synchronization is improved, but the complexity of coordinating pacing operations increases due to vulnerable period constraints
Solution Approach 1:
The patent simplifies coordination complexity by using preliminary action - the master device sends an arm command in advance, allowing the slave device to prepare its pacing pulse delivery without requiring complex real-time synchronization algorithms. This reduces the computational and coordination burden while maintaining stable pacing synchronization across chambers
Data Source
AI summary
In accordance with an embodiment, a system and method is provided for providing communications between first and second implantable medical devices (IMDs). The system comprises a first implantable medical device (IMD) configured to transmit a first event message during or preceding a first cardiac cycle, and a second IMD configured to receive the first event message, wherein receipt of the first event message configures the second IMD to generate pacing pulses for only a predetermined number (“n”) of consecutive cardiac cycles, wherein n is an integer equal to or greater than 2. The method comprises transmitting a first event message during or preceding a first cardiac cycle from the first IMD, receiving the first event message at the second IMD, in response to receiving the first event message, arming the second IMD to generate a pacing pulse for a second cardiac cycle, and arming the second IMD to generate a pacing pulse for only a predetermined number of consecutive cardiac cycles immediately subsequent to the second cardiac cycle.