Implantable Stimulator Electrode Selection for Evoked Response Recording
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Solution Overview
Problem
Measuring evoked responses using implantable stimulators is challenging due to difficult morphology, long acquisition windows, and small amplitude signals with competing artifacts and background noise.
Innovation Solution
Designate a set of electrodes based on impedance measurements to deliver electrical stimulation and record evoked responses, reducing interference from stimulation artifacts by using electrodes with minimum impedances for recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same electrodes are used for both stimulation and recording, then device complexity is reduced, but measurement precision deteriorates due to stimulation artifacts interfering with evoked response detection
Solution Approach 1:
The electrode array is segmented into distinct stimulation electrodes and recording electrodes. The stimulator delivers electrical stimulation through selected stimulation electrodes while separate recording electrodes detect the evoked response, preventing stimulation artifacts from contaminating the measurement signal.
Solution Approach 2:
The recording function is extracted from the stimulation electrodes by designating specific electrodes solely for recording. This separation removes the harmful stimulation artifacts from the recording path, allowing clean detection of the evoked response without interference from the stimulation pulse.
2Measurement precision
If impedance-based electrode designation is used, then measurement precision improves by reducing stimulation artifacts, but ease of operation deteriorates due to additional impedance measurement steps
Solution Approach 1:
Impedance measurements are performed in advance during the implantation procedure or initial device setup to identify suitable recording electrodes. This preliminary characterization of electrode properties allows the system to automatically select optimal electrode combinations for stimulation and recording, eliminating the need for manual trial-and-error electrode selection during subsequent operations.
Solution Approach 2:
The stimulator automatically performs impedance measurements and designates appropriate electrodes for stimulation and recording without requiring manual intervention. The device self-configures the electrode roles based on measured electrical properties, reducing the operational burden on the user while ensuring optimal measurement conditions.
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
Facilitates efficient data transmission of evoked responses with reduced analytical burden, enabling accurate identification of response features and condition evaluation in recipients.
Implementation Method 1
measuring impedances for each electrode included in a plurality of electrodes of an implantable stimulator
Data Source
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AI summary
An exemplary electrical status-based determination of electrodes of an implantable stimulator for measuring an evoked response may include measuring electrical statuses for each electrode included in a plurality of electrodes of an implantable stimulator that is implanted within a recipient, designating, based on the electrical statuses, a first set of one or more electrodes included in the plurality of electrodes as stimulating electrodes to be used to deliver electrical stimulation to the recipient, and designating, based on the electrical statuses, a second set of one or more electrodes included in the plurality of electrodes as recording electrodes to be used to record one or more signals representative of one or more evoked responses that occur within the recipient in response to the electrical stimulation.