Leadless Pacemaker Communication with Selective Atrial Event Messaging
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Solution Overview
Problem
Dual chamber leadless pacemaker systems face challenges in reducing power consumption for implant-to-implant communication, particularly for the atrial leadless pacemaker with a smaller battery and lower output impedance, which affects the longevity of the device.
Innovation Solution
The atrial leadless pacemaker determines the atrial-to-atrial interval (AA interval) and assesses its variation within a specified tolerance, selectively transmitting event messages only when the variation exceeds the tolerance, thereby conserving power and reducing unnecessary communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the aLP transmits i2i event messages to the vLP for every atrial event, then the dual-chamber coordination is maintained, but the power consumption increases and longevity decreases
Solution Approach 1:
The aLP transmits i2i event messages only partially - specifically, only when the AA interval variation exceeds the predetermined tolerance. This selective transmission reduces power consumption while maintaining adequate dual-chamber coordination by sending messages only when necessary for therapeutic accuracy.
Solution Approach 2:
The system changes the transmission parameter from continuous (every atrial event) to conditional (only when AA interval variation exceeds tolerance). This parameter change optimizes the balance between coordination reliability and power consumption by adjusting the transmission threshold based on physiological variability.
2Loss of information
If the aLP transmits i2i event messages for every atrial event, then complete atrial event information is provided to the vLP, but communication burden and power consumption increase
Solution Approach 1:
The aLP performs partial transmission of atrial event information - only transmitting when AA interval variation exceeds tolerance. This reduces communication burden and power consumption while retaining sufficient information for the vLP to maintain appropriate ventricular pacing coordination.
Solution Approach 2:
The system extracts and transmits only the necessary information - specifically, the i2i event message is transmitted only when the AA interval variation indicates a need for updated coordination. This extraction approach eliminates redundant transmissions and reduces overall communication energy consumption.
3Volume of moving object
If the aLP has a smaller battery and lower output impedance, then the device size is reduced, but the power consumption for communication becomes more significant
Solution Approach 1:
The aLP uses partial transmission actions - sending i2i event messages only when AA interval variation exceeds tolerance. This reduces the cumulative communication power consumption, which is particularly important for the aLP with its smaller battery, thereby extending device longevity despite the smaller energy storage capacity.
Solution Approach 2:
The system changes the communication parameter from continuous transmission to event-driven transmission based on AA interval variation. This parameter change reduces the frequency and total duration of communication events, thereby reducing overall power consumption for the aLP with its constrained battery capacity.
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 reduces power consumption in the atrial leadless pacemaker, increasing its longevity while maintaining effective coordination with the ventricular leadless pacemaker through optimized communication protocols.
Implementation Method 1
The i2i event messages sent between the LPs can be conductive communication messages. That is, conductive communication, which is more energy efficient than radio frequency (RF) communication and inductive communication, may be utilized for the i2i communication.
Implementation Method 2
Alternatively, RF or inductive communication may be utilized for the i2i communication that takes place between LPs.
Implementation Method 3
Alternatively, RF or inductive communication may be utilized for the i2i communication that takes place between LPs.
Data Source
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AI summary
An atrial leadless pacemaker (aLP) (102a), of a dual chamber leadless pacemaker system (100) that also includes a ventricular leadless pacemaker (vLP) (102b), senses intrinsic atrial events and for each intrinsic atrial event that is sensed determines a respective atrial-to-atrial interval (AA interval) that corresponds to a duration between the intrinsic atrial event and an immediately preceding intrinsic atrial event. Additionally, the aLP (102a), based on the determined AA intervals, selectively transmits and selectively abstains from transmitting atrial event messages to the vLP (102b). When the aLP (102a) abstains from transmitting atrial event messages to the vLP (102b), the aLP (102a) conserves power thereby increasing its longevity. The aLP (102a) can also be configured to operate in a similar manner for paced atrial events, to further conserve power. The vLP (102b) utilizes its W interval timer to determine when to deliver ventricular stimulation, during those times that the aLP (102a) abstains from transmitting atrial event messages to the vLP (102b).