Cochlear Implant Electrode Array Real-Time Positioning
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Solution Overview
Problem
Current cochlear implant insertion methods face challenges such as intracochlear trauma and incomplete insertion due to frictional forces, leading to poor positioning and reduced hearing outcomes, as surgeons lack real-time feedback on electrode array placement within the cochlea.
Innovation Solution
A system utilizing a pulse generator to apply current pulses between electrodes in the cochlear implant electrode array, measuring differential voltage to determine proximity to the cochlear tissue, providing real-time feedback for accurate placement and avoiding trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electrode array is inserted deeply into the cochlea to stimulate basal nerves for high frequency perception, then high frequency hearing is improved, but frictional forces increase causing intracochlear trauma and incomplete insertion
Solution Approach 1:
The system continuously measures electrical impedance between the electrode array and cochlear structures during insertion, providing real-time feedback to the surgeon about electrode position and proximity to sensitive structures. This enables precise positioning while avoiding trauma by alerting the surgeon before contact occurs.
Solution Approach 2:
The patent replaces mechanical measurement methods with electrical impedance measurement to assess electrode position. Instead of relying on mechanical force or visual inspection, the system uses electrical properties of tissue to determine spatial relationships, enabling non-contact, real-time positioning feedback.
2Productivity
If the electrode array is inserted forcefully to overcome friction and achieve complete insertion, then insertion completeness is improved, but intracochlear trauma increases
Solution Approach 1:
Real-time impedance measurements provide continuous feedback during the insertion process, allowing the surgeon to monitor progress and adjust insertion force dynamically. The system detects when the electrode array approaches sensitive structures through impedance changes, enabling complete insertion without excessive force that would cause trauma.
Solution Approach 2:
The system performs preliminary impedance measurements during the insertion process to identify potential trauma risks before they occur. By detecting changes in electrical impedance that indicate proximity to sensitive structures, the system enables preventive adjustment of insertion technique before damage can occur.
3Manufacturing precision
If real-time feedback is provided during insertion to improve positioning accuracy, then electrode placement precision is improved, but device complexity increases
Solution Approach 1:
The cochlear implant system performs multiple functions: it provides both the therapeutic electrical stimulation to the cochlear nerve and simultaneously measures electrical impedance for positioning feedback. By reusing existing electrodes and circuitry for dual purposes, the system achieves real-time localization without adding separate complex measurement apparatus.
Solution Approach 2:
The system uses its own electrical components and the body's natural electrical properties to perform self-diagnosis and self-localization. The implantable device measures its own position relative to cochlear structures by monitoring electrical impedance through its functional electrodes, eliminating the need for external sensing equipment.
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 precise and safe insertion of the electrode array, reducing trauma and incomplete insertions, thereby enhancing hearing outcomes by ensuring proper positioning and reducing power consumption.
Implementation Method 1
measuring the differential voltage across the pair of electrodes during the current pulse to determine the proximity between the structure of interest and the segment of the electrode array
Data Source
AI summary
A system and method for determining the location of an implant such as a cochlear implant relative to a structure of interest such as a tissue wall. The implant has an electrode array including a first electrode and a second electrode. The electrode array is insertable into an electrically-conductive volume relative to the inner wall of the scala tympani of the cochlea. A pulse generator generates a biphasic, constant-current pulse on the first and second electrodes. A controller measures the differential voltage across the pair of electrodes during the current pulse. The controller determines the proximity between the inner wall and the segment of the electrode array between the first and second electrodes based on the differential voltage between the first and second electrodes.