Neuromuscular Transmission Monitoring via EMG and KMG Sensor Fusion

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Solution Overview

Problem

Current neuromuscular monitoring techniques during surgery face challenges in accurately measuring muscle response in paralyzed patients due to interference and sensitivity issues, leading to potential overdosing of muscle relaxants and incorrect timing of neuromuscular blockade reversal, which can result in residual paralysis or inadequate anesthesia.

Innovation Solution

A neuromuscular transmission monitoring system that simultaneously uses electromyography (EMG) and kinemyography (KMG) sensors to measure muscle response to nerve stimulation, with an automatic baseline setting method to correct EMG readings based on KMG non-response values, ensuring reliable neuromuscular blockade monitoring.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If EMG sensor is used to measure muscle response, then sensitivity to detect electrical activity is improved, but interference from electrical noise and other devices increases

Engineering Contradiction:

ImprovesensitivityVSAvoidinterference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary processing system that receives signals from both EMG and KMG sensors, processes them through algorithms, and integrates the results. This intermediary processing layer filters electrical noise from EMG signals while incorporating the interference-resistant KMG measurements, thereby resolving the contradiction between EMG sensitivity and interference susceptibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a composite monitoring approach that combines two different sensing modalities (electrical EMG and mechanical KMG) into a unified measurement system. By fusing data from both sensor types with complementary characteristics, the system achieves both high sensitivity (from EMG) and interference resistance (from KMG), effectively resolving the technical contradiction.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If neuromuscular blocking agents are administered to prevent patient movement, then surgical conditions are improved, but accurate measurement of muscle response becomes difficult

Engineering Contradiction:

Improvesurgical conditionsVSAvoidmuscle response measurement

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent applies stimulation at intensities that exceed the threshold for visible muscle contraction, ensuring that even partially paralyzed muscles under neuromuscular blockade produce detectable responses. This excessive stimulation approach allows the system to measure residual muscle activity that would otherwise be undetectable, maintaining measurement precision while the patient remains under surgical anesthesia.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent replaces reliance on visible mechanical muscle movement (which is suppressed by neuromuscular blockers) with electrical (EMG) and processed mechanical (KMG) sensing that can detect sub-threshold or minimal muscle responses. This substitution allows accurate measurement of muscle response even when gross mechanical movement is absent due to anesthesia or paralysis.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If multiple sensors are used to ensure accurate measurement, then measurement reliability is improved, but device complexity increases

Engineering Contradiction:

Improvemeasurement reliabilityVSAvoidsensor integration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent designs a universal processing system that handles signals from multiple sensor types (EMG and KMG) through a single integrated interface. This multi-functional processor can analyze both electrical and mechanical signals using the same hardware platform and software algorithms, thereby improving measurement reliability through diverse sensing while avoiding the complexity of separate dedicated processing systems for each sensor type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 accurate and reliable neuromuscular monitoring by reducing interference and improving sensitivity, enabling precise measurement of muscle strength and timely reversal of neuromuscular blockade, thus preventing residual paralysis and ensuring appropriate anesthesia.

Implementation Method 1

an electromyography (EMG) sensor configured to measure electrical activity of the muscle

Methodology Applied

Scientific EffectElectromyography:

Implementation Method 2

a kinemyography (KMG) sensor configured to detect physical movement of the muscle

Methodology Applied

Scientific EffectKinemyography:

Data Source

PatentUS11259746B2Method and system for neuromuscular transmission measurement

Publication Date: 2022.03.01 GE PRECISION HEALTHCARE LLC

AI summary

Methods and systems are provided for monitoring neuromuscular blockade in patients during surgical procedures. In one embodiment, a system includes a stimulator, an electromyography (EMG) sensor, a kinemyography (KMG) sensor, and a single connector configured to couple each of the stimulator, the EMG sensor, and the KMG sensor to a patient monitoring device via a single input. In this way, neuromuscular transmission (NMT) monitoring in patient may be done reliably by ensuring that NMT measurement from a first sensor (EMG sensor) is in line with the measurement of the second sensor (KMG sensor).