Wearable Spinal Reflex Conditioning via VNS
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Solution Overview
Problem
Current methods for spinal reflex conditioning in patients with spasticity due to neurological injuries like stroke or spinal cord injury are limited by the inability to effectively detect and address spasticity in unmonitored muscles and require stationary setups, relying on visual feedback that may not be effective for non-volitional reflexes.
Innovation Solution
A system and method that uses wearable armbands or leg bands with electrodes to electrically stimulate peripheral nerves, measure spinal reflexes with high-density EMG, and administer vagus nerve stimulation (VNS) based on positive reinforcement criteria, allowing for ambulatory and automated conditioning without volitional input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If visual feedback is used for spinal reflex conditioning, then patient awareness of reflex activity is improved, but effectiveness for non-volitional reflexes deteriorates
Solution Approach 1:
The patent introduces an intermediary reinforcement mechanism that bridges the gap between visual feedback and non-volitional reflex modification. A separate reinforcement output delivers contingent reinforcement signals (such as tactile, auditory, or electrical stimulation) that directly associate with the spinal reflex activity, serving as a mediator that effectively conditions non-volitional reflexes while maintaining patient awareness through the visual display
Solution Approach 2:
The system implements a dual-feedback mechanism: visual feedback displays reflex activity levels to maintain patient awareness, while a separate reinforcement feedback loop delivers contingent reinforcement signals that directly modify the non-volitional reflex. This layered feedback approach resolves the contradiction by serving different functions through different feedback channels
2Measurement precision
If stationary setup is used for spinal reflex conditioning, then measurement precision is improved, but patient mobility and accessibility deteriorates
Solution Approach 1:
The wearable device integrates multiple functions into a single portable unit: EMG sensors for precise spinal reflex detection, stimulation electrodes for nerve activation, visual display for patient feedback, and reinforcement output for conditioning. This multi-functional integration maintains measurement precision while enabling ambulatory use and accessibility in various settings
Solution Approach 2:
The system segments the conditioning apparatus into wearable components that can be distributed across the patient's body (e.g., armband on upper arm, leg band on thigh), allowing precise local measurement while maintaining overall patient mobility and enabling use in diverse environments rather than requiring a fixed stationary setup
3Ease of operation
If volitional input is required for spinal reflex conditioning, then patient engagement is improved, but automation and independence of the system deteriorates
Solution Approach 1:
The system uses automated feedback mechanisms that detect spinal reflex activity through EMG sensors and automatically deliver contingent reinforcement signals without requiring patient volitional input. The visual display and reinforcement output are triggered automatically based on detected reflex activity, enabling system independence while maintaining patient engagement through passive observation and automatic reinforcement
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 effectively conditions spinal reflexes by providing non-cognitive reinforcement through VNS, improving motor control and reducing spasticity, and can be performed in various settings without requiring the patient's attention, enhancing motor and sensory function.
Implementation Method 1
evoking a spinal reflex by electrically stimulating a peripheral nerve of the anatomical limb
Implementation Method 2
measuring the spinal reflex using electromyography (EMG) signals acquired from the anatomical limb
Implementation Method 3
performing vagus nerve stimulation (VNS) in response to the measured spinal reflex satisfying a positive reinforcement criterion
Data Source
AI summary
In a method of performing spinal reflex conditioning for an anatomical limb of a person, a spinal reflex is evoked by electrically stimulating a peripheral nerve of the anatomical limb, for example using stimulation electrodes disposed on an armband or leg band. The resulting spinal reflex is measured using electromyography (EMG) signals acquired from the anatomical limb. Vagus nerve stimulation (VNS) is performed in response to the measured spinal reflex satisfying a positive reinforcement criterion. The EMG may be high density EMG (HD-EMG) measured using a sleeve with a high density array of electrodes (e.g., at least 100 electrodes in an arm sleeve).