Leadless Pacemaker PEP and LVET Sensing for Heart Failure Control
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Solution Overview
Problem
Existing cardiac pacing devices lack effective methods for adjusting pacing therapy to manage heart failure and cardiac dyssynchrony, which are critical for improving outcomes in patients with heart failure.
Innovation Solution
Incorporating an integrated electromechanical sensor, such as an accelerometer, within a leadless pacing device to determine relevant timing parameters like pre-ejection period (PEP) and left ventricular ejection time (LVET) to adjust pacing therapy in a closed loop fashion, generating alerts and adjusting parameters to manage heart failure and improve synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cardiac pacing devices are used without integrated electromechanical sensors, then the device structure remains simple, but the ability to monitor and adjust pacing therapy for heart failure management is insufficient
Solution Approach 1:
The patent combines multiple functions (pacing therapy delivery, electromechanical sensing, diagnostic monitoring, and closed-loop control) into a single integrated cardiac device. The accelerometer sensor is incorporated within the pacing device housing, allowing simultaneous measurement of mechanical cardiac events and delivery of therapeutic pacing pulses without requiring separate implanted components.
Solution Approach 2:
The pacing device is designed to perform multiple functions: delivering pacing therapy to treat bradycardia, sensing mechanical cardiac events via the accelerometer, calculating diagnostic metrics (PEP, LVET, PEP/LVET ratio), and automatically adjusting pacing parameters. This multi-functional approach eliminates the need for separate diagnostic and therapeutic devices.
2Extent of automation
If manual adjustment of pacing parameters is used, then the control precision is limited, but the device automation level remains low
Solution Approach 1:
The device implements closed-loop feedback control by continuously monitoring mechanical cardiac events via the accelerometer, calculating real-time values of PEP, LVET, and their ratio, and using these metrics to automatically adjust pacing parameters. The system compares measured values against target ranges and modifies pacing therapy accordingly, creating a self-regulating control system.
Solution Approach 2:
The pacing device autonomously performs diagnostic assessments and therapeutic adjustments without requiring external clinician intervention. The embedded processor automatically analyzes accelerometer signals, determines cardiac mechanical function status, and modifies pacing parameters to optimize cardiac resynchronization, enabling the device to self-manage heart failure therapy.
3Measurement precision
If comprehensive diagnostic monitoring is implemented, then the measurement precision improves, but the data processing complexity increases
Solution Approach 1:
The patent extracts specific diagnostic information (pre-ejection period and left ventricular ejection time) from the complex accelerometer signal by identifying characteristic mechanical events. Rather than analyzing the entire signal spectrum, the system focuses on detecting specific fiducial points (onset of ventricular contraction, aortic valve opening, aortic valve closure) to calculate the key metrics needed for heart failure assessment.
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
The system provides real-time monitoring and adjustment of pacing parameters to enhance cardiac resynchronization, effectively managing heart failure by detecting worsening conditions and improving heart function through automated adjustments.
Implementation Method 1
A leadless pacing device may include an integrated electromechanical sensor, such as an accelerometer, whose signal can be representative of various mechanical events that occur during the contraction/relaxation cycle of a ventricle of the patient's heart
Data Source
AI summary
A cardiac pacemaker that delivers cardiac pacing therapy that includes delivering the cardiac pacing therapy from a cardiac pacing device, sensing a pacing event from a plurality of electrodes of the pacing device, and sensing an electromechanical signal from an electromechanical sensor of the pacing device. A pre-ejection period is determined in response to the sensed electromechanical signal, and a left ventricular ejection time is determined in response to the sensed electromechanical signal. The pacemaker device performs one or both of adjusting a pacing parameter setting and generating an alert in response to the determined pre-ejection period and the determined left ventricular ejection time.