Cochlear Implant Dual-Ground Stimulation for Obstructed Cochlea
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Solution Overview
Problem
Cochlear implants face challenges in effectively stimulating lower frequencies due to ossification or anatomical obstructions, leading to incomplete insertion and mismatch between expected and received frequencies, which can damage the cochlea and impair hearing restoration.
Innovation Solution
A cochlear implant design with a flexible electrode array and dual ground electrodes, allowing for apical stimulation by mapping electrode contacts to both an apical and extracochlear ground electrode, extending effective frequency range without increasing physical length, using a processing arrangement to stimulate different frequency channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If longer electrode arrays are used to reach deeper into the cochlea for lower frequency stimulation, then the frequency range is improved, but the risk of damaging cochlear structures and insertion difficulty increase
Solution Approach 1:
The ground electrode path is segmented into two separate paths: an extracochlear ground electrode and an apical ground electrode. This segmentation allows the electrode array to be shorter and less invasive while still achieving deep electrical stimulation through alternative current pathways, thereby reducing mechanical damage risk while maintaining frequency range adaptability
Solution Approach 2:
The apical ground electrode acts as an intermediary element that enables electrical current to reach apical (lower frequency) regions of the cochlea without requiring physical insertion of the entire electrode array to that depth. This mediator facilitates low-frequency stimulation while keeping the invasive electrode array length minimal
2Adaptability or versatility
If electrode arrays are inserted deeper into the cochlea to stimulate lower frequencies, then the frequency range is improved, but the insertion difficulty increases
Solution Approach 1:
By dividing the grounding function between extracochlear and apical ground electrodes, the system separates the stimulation function (handled by shorter electrode array) from the deep-reaching function (handled by apical ground electrode), making insertion easier while maintaining full frequency range capability
Solution Approach 2:
The solution moves from a single-dimension approach (physical insertion depth) to a multi-dimensional approach by creating alternative current pathways through the apical ground electrode, enabling deep frequency stimulation without deep physical insertion
3Device complexity
If monopolar stimulation is used with extracochlear ground, then the setup is simple, but lower frequency stimulation is ineffective due to obstructions
Solution Approach 1:
The system dynamically switches between monopolar mode (using extracochlear ground for simplicity) and bipolar mode (using apical ground for low-frequency capability). This dynamic adaptability allows the same device to provide both simple operation and effective low-frequency stimulation based on clinical needs
Solution Approach 2:
The dual ground electrode configuration provides multi-functionality: the extracochlear ground electrode handles general monopolar stimulation for simplicity, while the apical ground electrode enables specialized bipolar stimulation for low-frequency regions, making the system universally applicable to various stimulation needs
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
Enhances sound quality and speech recognition in noisy environments by accurately stimulating lower frequencies, reducing the risk of cochlear damage, and improving temporal discrimination.
Implementation Method 1
Each of the electrode contacts on the array stimulates a different part of the cochlea and therefore, due to the tonotopic organization of the cochlea, provides a different pitch
Data Source
AI summary
A cochlear implant includes first and second ground electrodes, a flexible electrode array, a flexible electrode array, and a processing arrangement. The first electrode is positioned external to a cochlea of a patient. The second electrode is positioned within the cochlea on an apical side of an obstruction within the cochlea. The array has distal and proximal ends defining a length therebetween. The array includes electrode contacts arranged along at least a portion of the length. The array is inserted into the cochlea such that the distal end advances from a base of the cochlea towards an apex of the cochlea to a point located basally of the obstruction. The arrangement maps a first one of the contacts to the first electrode for providing a first electrical stimulation from the first contact to the first electrode to stimulate hearing of the patient at a first location in the cochlea, and a second mapping providing a second electrical stimulation from the first contact to the second electrode to stimulate hearing of the patient at a second location in the cochlea. The first location is positioned adjacent to the first contact when the implant is inserted into the cochlea in an operating position, and the second location is positioned further towards the apex as compared to the first contact when the implant is in the operating position.