Implantable Vagus Nerve Stimulation System with Heart Rate Variability Analysis
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Solution Overview
Problem
The current titration process for vagus nerve stimulation (VNS) in treating chronic cardiac dysfunction is time-consuming and inefficient, particularly for patients with urgent conditions like chronic heart failure, as it requires frequent clinic visits and prolonged periods to adjust stimulation intensity, leading to delayed delivery of full therapeutic doses.
Innovation Solution
An implantable VNS system that includes a sensor for ECG data measurement, a stimulation subsystem for delivering VNS according to a duty cycle, and a control system performing heart rate variability analysis to gradually increase stimulation intensity, allowing for automated titration and reduced clinic visits by using heart rate variability analysis to determine when to increase the VNS dose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual titration process is used with frequent clinic visits, then stimulation intensity can be adjusted safely, but treatment time is significantly extended and productivity is reduced
Solution Approach 1:
The system enables automated titration where the implantable device independently adjusts stimulation intensity based on physiological feedback (heart rate variability analysis) without requiring physician intervention for each adjustment, allowing the system to serve itself in optimizing therapy parameters
Solution Approach 2:
The system continuously monitors physiological parameters (ECG, heart rate variability) and uses this feedback to automatically adjust stimulation intensity, creating a closed-loop control system that safely optimizes therapy in real-time based on patient response
2Object-affected harmful factors
If stimulation intensity is gradually increased through titration, then patient comfort is maintained and side effects are minimized, but the time to deliver full therapeutic dose is prolonged
Solution Approach 1:
The titration process transitions from a static, schedule-based approach to a dynamic, physiology-based approach where stimulation intensity adjusts in real-time according to patient's physiological response, allowing faster progression when tolerated and pausing when side effects occur
Solution Approach 2:
The system changes the parameter of stimulation intensity dynamically based on heart rate variability metrics, adjusting amplitude, frequency, or pulse width parameters according to physiological feedback to optimize both comfort and treatment speed
3Reliability
If multiple clinic visits are scheduled for titration adjustments, then physician can monitor patient response, but scheduling conflicts extend titration period and patient urgency is not addressed
Solution Approach 1:
The implantable device performs self-monitoring and self-adjustment of stimulation parameters based on physiological feedback, eliminating the need for frequent clinic visits and allowing the system to independently optimize therapy
Solution Approach 2:
The manual mechanical process of physician-adjusted titration is replaced with an automated electronic control system that uses sensor feedback and algorithms to adjust stimulation parameters remotely and continuously
Data Source
AI summary
An implantable vagus nerve stimulation (VNS) system includes a sensor configured to measure ECG data for a patient, a stimulation subsystem configured to deliver VNS to the patient, and a control system configured to perform a heart rate variability analysis with the ECG data. In some aspects, performing the heart rate variability analysis includes measuring R-R intervals between successive R-waves for the ECG data measured during a stimulation period of VNS therapy and a baseline period of the VNS therapy, wherein the stimulation period comprises at least a portion of the ON period and the baseline period comprises at least a portion of the OFF period immediately preceding the ON period, and generating a plot of each R-R interval against an immediately successive R-R interval for each of the stimulation period and the baseline period configured to be displayed on a display.