Cochlear Implant Electrode Positioning via Tonotopic Mapping
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Solution Overview
Problem
Current cochlear implants face challenges in accurately simulating natural hearing due to sub-optimal electrode positioning, limited spectral resolution, and frequency shifting artifacts, which hinder effective stimulation of spiral ganglion nerves corresponding to sound frequencies.
Innovation Solution
A method and system for determining the precise location of implanted electrode arrays relative to spiral ganglion nerves using statistical shape models and tonotopic mapping, allowing for customized cochlear implant stimulation by identifying the positions of electrodes and nerves, constructing a tonotopic map, and adjusting electrode positions and stimulation parameters based on anatomical relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrode arrays are blindly threaded into the cochlea during surgery, then the surgical procedure can be completed, but the final positions of the electrodes are unknown and sub-optimal positioning occurs
Solution Approach 1:
The patent applies preliminary action by performing image processing and tonotopic mapping before final electrode configuration. Pre-operative CT scans are processed to create 3D models of the cochlea and predict optimal electrode positions and frequency allocations before the electrodes are actually implanted, allowing the surgical plan to be prepared in advance with precise positioning guidance.
Solution Approach 2:
The patent implements feedback by using post-operative imaging to verify electrode positions and then adjusting the frequency allocation map based on the actual measured positions. The system continuously refines the mapping by comparing expected versus actual electrode locations and correcting the frequency assignments accordingly to maintain optimal hearing restoration.
2Device complexity
If a default frequency allocation table is used assuming optimal electrode positioning, then the mapping process is simplified, but electrode channel interactions occur and hearing restoration fidelity is reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the frequency allocation map based on actual electrode positions. Instead of using a fixed default table, the system modifies frequency assignments, electrode activation patterns, and stimulation parameters according to the measured electrode locations and individual cochlear anatomy, thereby optimizing hearing restoration for each patient.
Solution Approach 2:
The patent implements local quality by customizing the frequency allocation for each specific electrode position rather than applying a uniform default mapping. The system tailors the frequency-to-electrode assignment to match the local anatomical characteristics and actual positioning of each electrode within the patient's unique cochlear structure, ensuring optimal local stimulation effectiveness.
3Measurement precision
If additional surgical procedures are performed to verify electrode positions, then positioning accuracy can be improved, but the complexity and invasiveness of the treatment increases
Solution Approach 1:
The patent uses image processing algorithms and computational models as intermediaries to infer electrode positions without requiring additional invasive surgical procedures. Instead of directly visualizing electrodes through further surgery, the system uses post-operative imaging data and applies sophisticated image processing to extract electrode location information, serving as a non-invasive intermediary measurement approach.
Solution Approach 2:
The patent replaces mechanical verification methods (additional surgical exploration) with computational and image-based verification. Instead of physically accessing and measuring electrode positions through further surgery, the system uses automated image processing, 3D reconstruction, and algorithmic analysis to determine electrode locations, substituting mechanical intervention with computational analysis.
Data Source
AI summary
One aspect of the invention provides a method for customizing cochlear implant stimulation of a living subject. The cochlear implant includes an electrode array having a plurality of electrodes implanted in a cochlea of the living subject. The method includes determining a position for each of the plurality of electrodes and spiral ganglion nerves that the electrode array stimulates, determining a geometric relationship between neural pathways within the cochlea and the electrode array implanted therein, and using one or more electrodes of the electrode array to stimulate a group of SG neural pathways of the cochlea based on the location of the one or more electrodes and their geometric relationship with the neural pathways.