Leadless Pacemaker Synchronization via Subcutaneous P-Wave Sensing
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Solution Overview
Problem
Current cardiac resynchronization therapy (CRT) systems using transvenous leads are prone to morbidities and failures, limiting their usage in heart failure patients, and there is a need for alternative systems that can effectively manage CRT using information from multiple implantable devices to synchronize heart chambers.
Innovation Solution
The system employs a leadless cardiac pacemaker (LCP) that receives data from a subcutaneous cardiac monitor or defibrillator to deliver pacing pulses based on detected atrial events, allowing for communication and coordination between devices to optimize cardiac resynchronization therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transvenous leads are used in CRT systems, then cardiac resynchronization therapy can be delivered, but the system is prone to morbidities and lead failures
Solution Approach 1:
The patent removes the transvenous leads from the system by implanting the pacemaker device entirely within the heart chamber (leadless design). The device is delivered catheter-based through the venous system but anchors in the cardiac chamber, eliminating the need for permanent transvenous leads and their associated morbidities while maintaining CRT functionality through multi-electrode arrays on the device housing.
Solution Approach 2:
The patent combines multiple functions into a single leadless device: pacing electrodes, sensing electrodes, and communication capabilities are integrated into one implantable unit. The device merges the functions of traditional pacemaker leads and generator into a single self-contained system that delivers CRT without external leads.
2Device complexity
If a single LCP is used for pacing, then the device is simpler to implant, but it cannot detect atrial events for resynchronization timing
Solution Approach 1:
The patent introduces a subcutaneous implantable cardiac monitor (SICD) as an intermediary device that detects atrial events (P-waves) and wirelessly transmits this timing information to the leadless cardiac pacemaker. This mediator enables the LCP to obtain atrial event data without requiring an atrial lead or direct atrial sensing capability, maintaining system simplicity while restoring resynchronization timing information.
3Object-affected harmful factors
If leadless cardiac pacemaker is used, then lead-related morbidities are reduced, but the ability to provide CRT resynchronization is limited
Solution Approach 1:
The patent designs the leadless cardiac pacemaker with multi-functionality to perform both bradycardia pacing and cardiac resynchronization therapy. The device includes multiple electrode arrays that can be configured for different pacing modes (single-chamber, dual-chamber, and biventricular pacing), allowing one device to replace multiple specialized devices and provide versatile heart failure therapy without leads.
Data Source
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AI summary
Systems and implantable devices configured to provide cardiac resynchronization therapy and/or bradycardia pacing therapy are disclosed. A first device located in the heart of the patient is configured to receive a communication from a second device and deliver a pacing therapy in response to or in accordance with the received communication. A second device located elsewhere is configured to determine an atrial event has occurred and communicate to the first device to trigger the pacing therapy. The second device may be configured for sensing the atrial event by the use of vector selection and atrial event windowing, among other enhancements. Exception cases are discussed and handled as well.