Electroneurographic Recording Electrode Array Interference Rejection
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Solution Overview
Problem
Existing systems for recording nerve signals struggle to effectively separate these signals from biological interference sources, such as muscle activity, which can distort the measurement and reduce the accuracy of nerve signal detection.
Innovation Solution
The implementation of a system with at least three electrodes along the nerve, including a center electrode and end electrodes, where additional electrodes are used to estimate and compensate for interference voltage, utilizing a negative impedance converter or regulated bipolar current/voltage source to create a low-impedance shunt path for interference, thereby isolating the nerve signal from biological interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electrode configurations are used to record nerve signals, then the recording system is simple, but biological interference from muscle activity cannot be effectively separated from the nerve signals
Solution Approach 1:
The electrode array is segmented into multiple electrodes (at least three electrodes including a first electrode, second electrode, and third electrode) positioned at different locations along the nerve. This segmentation allows the system to record signals from multiple points simultaneously, enabling the separation of nerve signals from muscle interference through spatial differentiation and signal processing.
Solution Approach 2:
The patent introduces additional electrodes as intermediary elements that specifically detect interference signals from muscle activity. These intermediary electrodes are positioned to capture biological interference without capturing the primary nerve signals, allowing the interference to be identified and subtracted from the total recorded signal to isolate the pure nerve activity.
2Measurement precision
If more electrodes are added to separate nerve signals from interference, then signal accuracy improves, but device complexity increases
Solution Approach 1:
Different electrodes in the array are assigned different local functions: the first electrode records the combined signal (nerve + interference), while the second and third electrodes are positioned to specifically record interference from muscle activity. This local quality differentiation allows the system to mathematically separate the signals without requiring an excessive number of electrodes.
Solution Approach 2:
The system uses feedback processing where the interference signals detected by the second and third electrodes are fed into a processing algorithm that subtracts the interference component from the signal recorded by the first electrode. This feedback mechanism enables continuous real-time separation of nerve signals from muscle interference, maintaining high accuracy without requiring manual intervention.
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
This approach significantly reduces interference currents, allowing for more accurate recording and processing of nerve signals, enabling better control signals for muscle activation or external device control, like prostheses, without affecting the measurement of nerve activity.
Implementation Method 1
utilizing a negative impedance converter or regulated bipolar current/voltage source to create a low-impedance shunt path for interference
Implementation Method 2
It is these membrane action currents, which allow the pickup of nerve activity with electrodes adjacent to the nerve, so-called extracellular electrodes
Data Source
AI summary
A system for recording electroneurographic activity comprising at least three neurosense electrodes capable of sensing a nerve signal from a peripheral nerve and means for receiving and processing the sensed nerve signal to identify a signal indicative of a specific action being a movement of a body part performed by the patient and for producing a control signal in response thereto featuring means for rejection of signals originating from biological interference sources without affecting the electroneurographic activity measured.