Ipsilateral Motor Cortex Signal Decoding for Stroke Rehabilitation

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Solution Overview

Problem

Conventional brain-computer interfaces (BCIs) for motor impairment, such as hemiparesis resulting from unilateral stroke, rely on contralateral motor cortex signals, which are often injured, limiting their effectiveness in providing assistive control for affected limbs.

Innovation Solution

A method and system utilizing ipsilateral motor cortex signals from the unaffected hemisphere to control body parts or devices, leveraging electrocorticographic (ECoG) signals to decode distinct features associated with ipsilateral hand movements for independent thought-driven device control, bypassing normal output pathways.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional BCI systems use contralateral motor cortex signals to control external devices, then the control system can leverage well-established neural pathways, but the system becomes ineffective when the contralateral hemisphere is injured (e.g., stroke)

Engineering Contradiction:

Improveeffectiveness of controlVSAvoidapplicability to ipsilateral control

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent inverts the conventional contralateral control approach by utilizing ipsilateral motor cortex signals from the same hemisphere to control the affected limb. This inversion allows the system to function when the contralateral pathway is damaged, as it bypasses the injured hemisphere and uses the intact ipsilateral hemisphere for control signals.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces an intermediary decoding system that translates ipsilateral motor cortex signals into control commands for external devices. This intermediary layer bridges the gap between the non-conventional ipsilateral neural signals and the standard control interfaces, enabling effective communication between the intact hemisphere and the affected limb control system.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If BCI systems utilize ipsilateral motor cortex signals from the same hemisphere, then the system can provide control for affected limbs after stroke, but the signal decoding becomes more challenging due to less understood neural pathways

Engineering Contradiction:

Improvecontrol of affected limbVSAvoidsignal decoding complexity

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent replaces the need for direct mechanical understanding of complex ipsilateral neural pathways with a computational decoding system. Instead of requiring detailed knowledge of the mechanical neural pathways, the system uses signal processing and machine learning algorithms to decode the ipsilateral signals, substituting computational complexity for biological complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs parameter changes in the signal processing domain, transforming raw ipsilateral motor cortex signals into meaningful control parameters through filtering, feature extraction, and decoding. By changing the parameters of signal representation and analysis, the system makes the complex ipsilateral signals interpretable and controllable.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If conventional methods rely on contralateral hemisphere signals, then the control system follows normal brain-body mapping, but the system cannot provide assistance when the controlling hemisphere is damaged

Engineering Contradiction:

Improveintuitive controlVSAvoidcontrol availability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent converts the harm of contralateral hemisphere damage into a benefit by utilizing the intact ipsilateral hemisphere. The very asymmetry that causes the problem (unilateral stroke affecting one side) becomes the solution, as the unaffected ipsilateral hemisphere can be harnessed to control the affected limb through the novel decoding system.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Enables effective control of prosthetic devices or external objects by utilizing unique spatial and temporal features of ipsilateral motor processing, improving motor impairment recovery and providing a directed approach to restoring function in stroke-induced hemiparesis.

Implementation Method 1

leveraging electrocorticographic (ECoG) signals to decode distinct features associated with ipsilateral hand movements

Methodology Applied

Scientific EffectElectrocorticography (ECoG):

Data Source

PatentEP2166935B1Methods and systems for controlling body parts and devices using ipsilateral motor cortex and motor related cortex

Publication Date: 2018.10.03 WASHINGTON UNIV IN SAINT LOUIS

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Figure 2A~2D
Figure 3A~3B

AI summary

A system for controlling a body part includes a number of sensing devices that sense signals from a hemisphere of a brain. A signal translating unit translates the signals into a command signal for controlling the body part, which is on a same side of the body as the hemisphere of the brain. A prosthetic device receives the command signal from the signal translating unit and manipulates the body part in response to the command signal.