Leadless Dual-Chamber Pacing With Extracardiac P-Wave Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pacemakers face challenges in accurately sensing atrial P-waves due to low amplitude in ventricular EGM signals, leading to inefficient ventricular pacing and complications from transvenous leads.
Innovation Solution
An IMD system comprising a subcutaneous extracardiac sensing device that senses P-waves and transmits trigger signals to an intracardiac pacemaker to synchronize ventricular pacing, eliminating the need for physical connections and reducing complications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transvenous leads are used to connect subcutaneous pacemaker to heart, then electrical stimulation can be delivered to ventricle, but infection risk and lead complications increase
Solution Approach 1:
The patent extracts the sensing function from the intracardiac pacemaker and places it in a separate subcutaneous device. The intracardiac pacemaker only performs therapy delivery, while the subcutaneous device handles P-wave sensing and trigger signal generation. This separation eliminates the need for transvenous leads connecting the pacemaker to the heart, thereby eliminating infection risk associated with leads while maintaining electrical stimulation capability through the intracardiac device's housing electrodes.
2Measurement precision
If intracardiac pacemaker senses P-waves directly, then pacing synchronization is achieved, but device size increases due to sensing requirements
Solution Approach 1:
The patent segments the pacemaker system into two distinct devices: a subcutaneous device dedicated to P-wave sensing and trigger signal generation, and an intracardiac device dedicated to therapy delivery. The subcutaneous device contains the sensing electrodes and signal processing circuitry, while the intracardiac device only contains the pulse generator and delivery electrodes. This segmentation allows each device to be optimized for its specific function, keeping the intracardiac pacemaker compact while achieving accurate P-wave sensing through the separate subcutaneous device.
3Ease of operation
If dual-chamber pacing is implemented without leads, then invasive procedures are minimized, but sensing reliability may be compromised
Solution Approach 1:
The patent introduces an intermediary subcutaneous device that mediates between the external environment and the intracardiac pacemaker. This subcutaneous device contains sensing electrodes that contact the skin surface and detect P-waves, then transmits trigger signals wirelessly to the intracardiac pacemaker. This intermediary approach maintains sensing reliability by using dedicated sensing electrodes optimized for P-wave detection, while minimizing invasiveness by eliminating transvenous leads and using a separate subcutaneous implant site.
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
Enables reliable dual-chamber pacing without leads, minimizing invasive procedures, reducing device size, and lowering complications, while optimizing P-wave sensing and ventricular pacing synchronization.
Implementation Method 1
sensing a P-wave by an extracardiac sensing device via housing-based electrodes when the sensing device is implanted in a patient outside the patient's cardiovascular system
Data Source
AI summary
An implantable medical device system includes an extracardiac sensing device and an intracardiac pacemaker. The sensing device senses a P-wave attendant to an atrial depolarization of the heart via housing-based electrodes carried by the sensing device when the sensing device is implanted outside the cardiovascular system and sends a trigger signal to the intracardiac pacemaker in response to sensing the P-wave. The intracardiac pacemaker detects the trigger signal and schedules a ventricular pacing pulse in response to the detected trigger signal.