Ventricular Electrode Atrial Sensing for Single-Lead IMDs
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Solution Overview
Problem
Existing implantable medical devices (IMDs) for dual chamber sensing require multiple leads and/or thick leads to accommodate dedicated electrodes for the right atrium and ventricle, increasing the risk of complications and dislodgement during implantation.
Innovation Solution
An IMD design utilizing a single lead with a right ventricle near field electrode and a far field electrode, along with sensing circuitry, to define atrial and ventricular sensing vectors without dedicated atrial electrodes, enabling AV synchrony and cardiac activity monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple leads or thick leads are used to accommodate dedicated atrial and ventricular electrodes, then dual chamber sensing capability is achieved, but the risk of implantation complications and dislodgement increases
Solution Approach 1:
The patent applies multi-functionality by enabling ventricular electrodes to perform both ventricular sensing and atrial sensing functions. The sensing circuitry is configured to detect atrial cardiac activity through ventricular electrodes by utilizing the conductive pathway through the myocardium, thereby eliminating the need for separate dedicated atrial electrodes and reducing lead complexity while maintaining dual chamber sensing capability
Solution Approach 2:
The patent merges the functions of atrial and ventricular sensing into a single lead system. By combining atrial sensing capability with ventricular electrodes and using the housing as a common electrode for both chambers, the invention reduces the number of leads from multiple separate leads to a single integrated lead, thereby reducing implantation complications and dislodgement risk
2Adaptability or versatility
If multiple leads are used for dual chamber sensing, then atrial and ventricular monitoring is achieved, but device complexity and implantation difficulty increase
Solution Approach 1:
The sensing circuitry is designed to perform multiple functions: it detects ventricular cardiac activity through ventricular electrodes and simultaneously detects atrial cardiac activity through the same ventricular electrodes by utilizing the myocardial conduction pathway. This multi-functional design eliminates the need for separate dedicated atrial sensing electrodes, reducing device complexity while maintaining comprehensive monitoring capability
Solution Approach 2:
The patent combines atrial and ventricular sensing functions into a single integrated system using one lead with ventricular electrodes. The housing serves as a common electrode for both sensing modes, merging what would traditionally require separate leads and electrodes into a unified configuration, thereby reducing overall device complexity
3Device complexity
If a single lead with ventricular electrodes is used for atrial sensing, then the number of leads is reduced, but signal quality and sensing accuracy must be maintained
Solution Approach 1:
The patent uses the ventricular myocardium as an intermediary medium to transmit atrial electrical signals to the ventricular electrodes. The sensing circuitry detects atrial cardiac activity by measuring the propagated electrical signals through the myocardial tissue, which acts as a natural conductor, thereby enabling accurate atrial sensing without direct atrial electrode contact
Solution Approach 2:
The sensing circuitry is configured with adjustable sensitivity parameters and filtering characteristics optimized for detecting atrial signals through the ventricular electrodes. By modifying the electrical parameters of the sensing circuit (such as gain, filter frequencies, and threshold levels), the system maintains high measurement precision for atrial activity detection despite using an indirect sensing pathway
Data Source
AI summary
An implantable medical device and method are described that include a housing, a right ventricle (RV) near field (NF) electrode, a far field (FF) electrode, and sensing circuitry. The housing contains one or more processors. The RV NF electrode is electrically connected to the one or more processors and configured to be located within the RV of a heart of a patient and either in contact with ventricular myocardial tissue of the heart or within a threshold proximity of the ventricular myocardial tissue. The FF electrode is configured to be positioned beyond the threshold proximity of the ventricular myocardial tissue. The sensing circuitry is coupled to the RV NF electrode and the FF electrode and configured to define an atrial sensing vector to collect atrial sensing data associated with atrial cardiac activity. The one or more processors are configured to receive the atrial sensing data.