Closed-Loop Vagus Nerve Microstimulator for Adaptive Inflammation Control
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Solution Overview
Problem
Existing implantable electrical stimulation devices for treating chronic inflammation lack closed-loop feedback mechanisms, leading to variable and potentially ineffective treatment due to desensitization and patient-to-patient variability, and are susceptible to mechanical damage from bending or flexing.
Innovation Solution
A leadless implantable microstimulator with integral electrodes, configured for closed-loop feedback, is positioned on the vagus nerve using a nerve cuff with a POD to stabilize the device and shield surrounding tissues, featuring a ceramic capsule with biocompatible metal fittings, a rechargeable battery, and a controller that adjusts stimulation based on neural activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional open-loop implantable electrical stimulation devices are used, then the device structure is simpler, but the treatment effectiveness deteriorates due to inability to adapt to patient variability and desensitization
Solution Approach 1:
The patent implements closed-loop feedback by incorporating neural activity sensors that continuously monitor vagus nerve signals and feed this information back to the stimulation controller. The controller adjusts stimulation parameters (amplitude, frequency, pulse width) in real-time based on the neural feedback, enabling adaptive stimulation that compensates for patient variability and desensitization, thereby improving treatment effectiveness.
Solution Approach 2:
The device transitions from static open-loop stimulation to dynamic closed-loop stimulation where parameters are continuously adjusted based on real-time neural feedback. The system dynamically adapts stimulation characteristics to match individual patient responses and changing neural states, enhancing reliability while managing complexity through programmable control.
2Reliability
If leadless implantable microstimulators with integral electrodes are used, then mechanical damage from bending or flexing is reduced, but device complexity increases due to integration requirements
Solution Approach 1:
The patent merges the electrode assembly directly with the stimulator housing to form an integrated leadless microstimulator. The electrodes are positioned within the same封装 as the stimulation circuitry, eliminating separate leads and connections. This integration eliminates mechanical failure points associated with bending or flexing external leads, improving reliability while managing complexity through compact integrated design.
Solution Approach 2:
The patent extracts and eliminates the separate lead component from traditional implantable stimulators. By taking out the external lead and integrating electrode functions directly into the implantable microstimulator body, the design removes the vulnerable component that was susceptible to mechanical damage from bending or flexing, thereby improving durability.
3Reliability
If closed-loop feedback stimulation is implemented, then treatment efficacy is improved through adaptation to individual needs, but energy consumption increases
Solution Approach 1:
The system employs periodic sampling of neural activity rather than continuous monitoring, adjusting the sampling rate based on clinical needs and patient response. Stimulation pulses are delivered in periodic bursts rather than continuously, with the frequency and duration modulated by feedback signals. This periodic operation reduces overall energy consumption while maintaining effective treatment through adaptive pulsing.
Solution Approach 2:
The controller dynamically changes stimulation parameters (amplitude, frequency, pulse width, duty cycle) based on neural feedback to optimize the balance between treatment efficacy and energy consumption. By adjusting parameters in real-time, the system delivers sufficient stimulation to maintain effectiveness while minimizing unnecessary energy expenditure, adapting to individual patient requirements.
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 stable, energy-efficient, and effective vagus nerve stimulation by minimizing mechanical damage and adapting to individual patient needs, reducing tachyphylaxis and improving treatment efficacy for chronic inflammation.
Implementation Method 1
implantable microstimulators adapted for electrically stimulating one or more nerves (e.g., the vagus nerve) to treat chronic inflammation by modulation of the inflammatory response (via the nicotinic cholinergic anti-inflammatory pathway)
Data Source
AI summary
Devices, systems and methods for the treatment of chronic inflammatory disorders that include an implantable microstimulator and an external charger/controller wherein the microstimulator is configured to operate using closed-loop feedback. The feedback for the microstimulator can be electrical activity of the vagus nerve and/or heart sensed by the microstimulator. The feedback can be used to modulate the stimulation duration, intensity, frequency, on-time and off-time.