Transseptal Lead Electrode Placement for Cardiac Impedance Monitoring
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Solution Overview
Problem
Current implantable medical devices (IMDs) face challenges in effectively sensing and managing cardiac activity across multiple heart chambers, particularly in diagnosing valve diseases and synchronizing ventricular contractions, due to limited electrode placement and impedance monitoring capabilities.
Innovation Solution
The development of IMDs with transseptal leads that position electrodes across the mitral and tricuspid valves, enabling comprehensive monitoring of electrograms and impedance values across multiple heart chambers, along with pressure sensors to provide pressure-volume loop data, allowing for precise diagnosis of cardiac conditions and optimization of pacing therapies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single-chamber electrode placement is used, then device complexity is reduced, but measurement precision and diagnostic capability for valve diseases are insufficient
Solution Approach 1:
The patent divides the cardiac monitoring system into multiple segmented electrodes positioned in different heart chambers (right atrium, left atrium, right ventricle, left ventricle). Each electrode segment monitors specific local impedance changes, enabling precise detection of valve diseases through distributed measurement points rather than a single complex sensor.
Solution Approach 2:
The patent transitions from traditional single-chamber monitoring to multi-chamber three-dimensional spatial monitoring. By placing electrodes across multiple heart chambers and measuring impedance in different spatial dimensions, the system achieves comprehensive valve disease detection capability that cannot be obtained from single-chamber measurements.
2Adaptability or versatility
If multi-chamber electrodes are positioned across valves, then diagnostic capability for valve diseases improves, but device complexity and implantation difficulty increase
Solution Approach 1:
The patent designs electrodes that serve multiple functions: they simultaneously perform electrical stimulation for cardiac resynchronization therapy and impedance sensing for valve disease diagnosis. This multi-functionality reduces the need for separate dedicated sensors and actuators, thereby managing device complexity while enhancing versatility.
Solution Approach 2:
The system continuously monitors impedance changes across heart chambers and uses this feedback to optimize pacing therapy parameters. The feedback loop enables real-time adjustment of cardiac resynchronization therapy based on detected valve function and chamber synchronization, improving therapeutic adaptability without requiring complex manual programming.
3Loss of information
If impedance monitoring across multiple chambers is implemented, then detection of filling and ejection abnormalities improves, but energy consumption and device complexity increase
Solution Approach 1:
The patent implements periodic impedance measurements rather than continuous monitoring. Impedance sensing is performed at specific intervals during the cardiac cycle at multiple heart chambers, capturing essential filling and ejection information while minimizing power consumption by keeping sensors inactive between measurement periods.
Solution Approach 2:
The system performs impedance measurements at selected heart chambers and time points rather than exhaustive continuous monitoring of all chambers. This partial action approach captures sufficient cardiac function information for diagnosing filling and ejection abnormalities while reducing the overall energy burden compared to complete continuous multi-chamber monitoring.
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 accurate detection of valve diseases, filling and ejection abnormalities, and synchronization of ventricular contractions, improving cardiac therapy delivery and patient outcomes by providing detailed cardiac function analysis.
Implementation Method 1
monitor, sense, or measure electrograms (EGMs) and impedance values from and across one or more of the left ventricle, right ventricle, left atrium, and right atrium
Implementation Method 2
monitor, sense, or measure electrograms (EGMs) and impedance values from and across one or more of the left ventricle, right ventricle, left atrium, and right atrium
Implementation Method 3
one or more pressure sensors positionable on one or both of a transseptal lead and right ventricular lead to position the one or more pressure sensors in one or more of the left ventricle, right ventricle, left atrium, and right atrium
Data Source
AI summary
Implantable medical devices including a transseptal lead are described herein. The transseptal lead may be positioned or placed through the interatrial septum from the right atrium to the left atrium of a patient's heart and further through the mitral valve. The transseptal lead may include at least one left atrial electrode and at least one left ventricular electrode for sensing, among other things, left atrial and left ventricular electrograms, left atrial and left ventricular impedances, and cross mitral valve impedance.