Muscle Relaxation Monitoring Calibration for Supramaximal Stimulation
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Solution Overview
Problem
Existing muscle relaxation monitoring systems face challenges in accurately determining the supramaximal stimulation current value during emergency situations or recovery phases due to the use of preset, high-level emergency stimulation current values, leading to unstable monitoring and difficulty in administering medical agents at the correct timing.
Innovation Solution
A muscle relaxation monitoring apparatus with a calibration processing section that adjusts stimulation timing and current values based on the subject's state, using a first timing for awake states and a longer second timing for muscle relaxation states to detect the supramaximal stimulation current value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a preset high-level emergency stimulation current value is used for muscle relaxation monitoring, then the system can operate without calibration in emergency situations, but the monitoring becomes unstable and inaccurate due to susceptibility to noises and failure to exceed the subject's supramaximal stimulation threshold
Solution Approach 1:
The system performs a calibration process before emergency monitoring to preliminarily determine the subject-specific supramaximal stimulation current value. This preliminary action ensures that when emergency monitoring begins, the correct subject-specific threshold is already established, eliminating the need to use inaccurate preset values during critical situations.
Solution Approach 2:
The system changes the stimulation current value from a fixed preset emergency value to a dynamically determined subject-specific supramaximal value based on calibration results. This parameter change adapts the monitoring system to individual subject characteristics, improving measurement precision while maintaining ease of operation through automated calibration.
2Measurement precision
If a calibration process is performed to acquire the subject-specific supramaximal stimulation current value, then accurate muscle relaxation monitoring is achieved, but the process cannot be performed in emergency situations where time is critical
Solution Approach 1:
The calibration process is performed as a preliminary action during non-emergency periods when time is available. This allows the system to establish accurate subject-specific parameters in advance, so that during actual emergencies, the pre-determined values can be immediately applied without time loss.
Solution Approach 2:
The system dynamically adapts its operation mode based on the situation: performing full calibration when time permits, and switching to using pre-established values during emergencies. This dynamic approach optimizes the balance between measurement precision and time efficiency depending on operational context.
3Object-affected harmful factors
If the preset emergency stimulation current value is smaller than the subject's supramaximal stimulation threshold, then the system avoids excessive stimulation, but the detected TOF ratio becomes unstable and medical agent administration timing cannot be correctly determined
Solution Approach 1:
The system changes from using a fixed preset current value to using a dynamically determined subject-specific supramaximal current value through calibration. This parameter adaptation ensures the stimulation current is precisely tailored to each subject's threshold, avoiding both excessive stimulation and insufficient stimulation that would cause unstable TOF ratio detection.
Solution Approach 2:
The calibration process uses feedback from observed muscle responses to iteratively determine the correct supramaximal stimulation current value. This feedback mechanism ensures the final current value is optimized to produce stable, reliable TOF ratio measurements without causing excessive muscle stimulation.
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 accurate detection of the supramaximal stimulation current value, stabilizing muscle relaxation monitoring even in emergency scenarios and recovery phases, ensuring timely administration of medical agents.
Implementation Method 1
a calibration process that electrically stimulates a nerve of a subject by a predetermined stimulation current value at a predetermined stimulation timing
Data Source
AI summary
A muscle relaxation monitoring apparatus includes a calibration processing section for performing a calibration process that electrically stimulates a nerve which is an observation portion of a subject, by a predetermined stimulation current value at a predetermined stimulation timing, and that acquires a stimulation current value of a supramaximal stimulation exceeding a maximal stimulation of the subject, based on an amplitude peak value of an electric signal that is based on a stimulation response of a muscle due to the electrical stimulation. The calibration processing section performs, when the subject is in an awake state, the calibration process while using a first stimulation timing that is preset, as the stimulation timing, and performs, when the subject is in a muscle relaxation state, the calibration process while using a second stimulation timing that is longer in period than the first stimulation timing, as the stimulation timing.