VNS Titration Control After Defibrillation Shock Detection
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Solution Overview
Problem
Existing vagus nerve stimulation (VNS) therapies require manual titration processes that are time-consuming and inconvenient for patients due to scheduling conflicts, and there is a lack of technology to address unexpected changes in patient condition during automated titration.
Innovation Solution
An implantable medical device that adjusts VNS therapy based on detecting defibrillation shocks, reducing intensity to compensate for post-shock sensitivity, and automating the titration process to minimize patient discomfort and optimize therapeutic delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If automated titration is implemented, then titration time and patient visits are reduced, but the system cannot account for unexpected changes in patient condition such as defibrillation shocks
Solution Approach 1:
The system continuously monitors patient physiological signals (ECG, accelerometer) and uses this feedback to detect defibrillation shocks and adjust stimulation intensity accordingly. This closed-loop feedback mechanism enables the automated system to respond to unexpected patient condition changes while maintaining time efficiency.
Solution Approach 2:
The implantable device autonomously detects defibrillation shocks and adjusts VNS parameters without requiring patient action or provider intervention. The system serves itself by automatically modifying therapy based on sensed physiological events, reducing the need for manual reprogramming while adapting to patient needs.
2Object-affected harmful factors
If defibrillation shock detection and adjustment is added to the automated titration system, then patient comfort is improved, but device complexity increases
Solution Approach 1:
The implantable device performs multiple functions: automated titration, defibrillation shock detection, and stimulation intensity adjustment. By combining these functions into a single multi-functional system, the patent avoids the need for separate devices while reducing overall system complexity.
Solution Approach 2:
The system uses physiological signals (ECG, accelerometer data) as intermediaries to detect defibrillation shocks indirectly. Rather than requiring direct shock sensing, the system analyzes intermediate physiological responses, simplifying the detection mechanism while maintaining accuracy.
3Object-affected harmful factors
If stimulation intensity is reduced after defibrillation shock, then patient comfort is improved, but therapeutic efficacy may be compromised
Solution Approach 1:
The system dynamically adjusts stimulation intensity based on real-time detection of defibrillation shocks. Rather than using fixed intensity levels, the system modifies parameters adaptively, reducing intensity temporarily after shocks and then gradually increasing it again, optimizing both comfort and therapeutic efficacy over time.
Solution Approach 2:
The system proactively reduces stimulation intensity before potential discomfort occurs by detecting defibrillation shocks and preemptively adjusting parameters. This preliminary action prevents patient discomfort while maintaining therapeutic benefits through subsequent gradual intensity increases.
Data Source
AI summary
A method of delivering neurostimulation therapy to a patient from an implantable medical device is provided. The method includes delivering, by the implantable medical device, the neurostimulation therapy to the patient. The method further includes determining, by the implantable medical device, that the patient has received a defibrillation shock from a defibrillation device. The method further includes adjusting, by the implantable medical device, the neurostimulation therapy based on determining that the patient has received the defibrillation shock.