Grid Electrode Stimulation for Consistent Evoked Potential Recording
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional evoked potential recordings in clinical and surgical settings often suffer from sub-optimal quality and inconsistency due to variable neuroanatomy, improper electrode placement, and sub-optimal stimulation parameters, leading to reduced clinical utility.
Innovation Solution
A multi-polar grid electrode system with a multi-channel power source and specialized software/hardware to systematically determine the optimal combination of active electrodes and stimulation parameters for precise current distribution, using brief bursts of stimulation and differential amplification to enhance evoked potential recordings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single-pair electrode stimulation is used, then the device complexity is low, but the measurement precision and reliability of evoked potential recordings deteriorate due to sub-optimal current distribution and variable neuroanatomy
Solution Approach 1:
The patent divides the single stimulating electrode into multiple electrodes arranged in a grid array, allowing independent control of each electrode. This segmentation enables precise targeting of neural structures by activating specific electrode combinations, thereby improving measurement precision of evoked potentials while managing complexity through systematic control methods
Solution Approach 2:
The patent transitions from one-dimensional single-point stimulation to two-dimensional grid array stimulation. This dimensional expansion allows current to be distributed across multiple spatial locations, enabling optimization of current pathways through software-controlled selection of active electrodes, thus improving recording quality without proportionally increasing physical complexity
2Reliability
If traditional fixed stimulation parameters are used, then the ease of operation is high, but the reliability of evoked potential responses deteriorates due to variable neuroanatomy and sub-optimal parameter choices
Solution Approach 1:
The patent implements dynamic stimulation parameters that can be adjusted based on real-time feedback and pre-programmed optimization algorithms. The system automatically modifies pulse duration, amplitude, and electrode selection to match the specific anatomical variations of each patient, thereby improving response consistency while reducing the need for manual parameter tuning by operators
Solution Approach 2:
The system incorporates feedback mechanisms where evoked potential responses are monitored and used to adjust subsequent stimulation parameters. The software analyzes recorded responses and automatically optimizes electrode combinations and stimulation intensities, improving reliability through iterative refinement while maintaining ease of operation through automation
3Measurement precision
If multiple electrode combinations are tested to optimize current distribution, then the measurement precision improves, but the time required for assessment increases
Solution Approach 1:
The patent implements pre-programmed electrode combination sequences that are prepared in advance based on probable anatomical configurations. The system automatically cycles through optimized electrode patterns without requiring real-time manual adjustment, thereby achieving high measurement precision while minimizing the time penalty associated with testing multiple configurations
Solution Approach 2:
The system employs algorithms that skip non-optimal electrode combinations by predicting effective patterns based on initial responses and anatomical data. This allows the system to rapidly traverse through potential electrode configurations, testing only those most likely to yield diagnostic information, thus reducing assessment time while maintaining precision
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
Improves the quality, consistency, and utility of evoked potential recordings by optimizing electrical activation of nerves, enabling more accurate assessments of neurological structures and pathways, particularly in challenging anatomical scenarios.
Implementation Method 1
electrical stimulating electrodes to activate nerves or nerve pathways while simultaneously recording the resultant neural activity
Implementation Method 2
utilizing brief bursts of stimulation and differential amplification to enhance evoked potential recordings
Data Source
AI summary
Systems and methods for enhancing diagnostic evoked potential recordings of a nerve or nerve pathway of interest. A grid array of stimulating electrodes are placed on, over, or through skin in a location beneath which a nerve or nerve pathway is suspected to lie. A stimulator controls the grid array, where each electrode is independently controllable as active or inactive, as a cathode or anode, etc. A plurality of recording electrodes may record Somato-Sensory Evoked Potentials (SSEPs) and/or Transcranial Electrical Motor Evoked Potentials (TCeMEP) in response to activation of the stimulating electrodes. A processor controls stimulating the stimulating electrodes, and receives responses from the recording electrodes, in a general search mode and a focused search mode in order to use a minimum stimulation intensity at which a maximum response amplitude is detected to continually stimulate the nerve or the nerve pathway.