Multilayer Inductance Coil Layout for Low-Field Power Transfer
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Solution Overview
Problem
Existing hearing prostheses, such as cochlear implants, face challenges in efficiently transferring power and data transcutaneously due to the limitations of conventional inductive communication coils, which can cause excessive electric fields and reduced efficiency.
Innovation Solution
The development of a multi-layered inductance communication coil configuration with specific dimensions and materials, such as platinum or gold wire, to minimize electric fields and enhance the Q factor, enabling efficient transcutaneous power and data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional inductive communication coils are used for transcutaneous power and data transfer, then the basic function of hearing prosthesis operation is achieved, but excessive electric fields are generated reducing efficiency and safety
Solution Approach 1:
The patent transitions from planar 2D coil windings to 3D立体 winding structures, where the conductor winds through multiple layers and levels. This dimensional change allows the magnetic field to be concentrated and directed more effectively through the skin barrier, improving coupling efficiency between external and implanted coils while reducing the overall electric field exposure area.
Solution Approach 2:
The patent implements nested winding patterns where inner turns are positioned within the geometric boundaries of outer turns, creating a compact multi-turn structure. This nesting approach increases the number of effective turns within a smaller footprint, enhancing inductance and magnetic coupling without proportionally increasing the electric field exposure area, thus improving power transfer efficiency while controlling harmful field exposure.
2Ease of manufacture
If the coil structure is simplified for ease of manufacture, then production cost decreases, but the Q factor and power transfer efficiency are reduced
Solution Approach 1:
The patent divides the continuous conductor into segmented sections with specific winding patterns, where each segment contributes to the overall inductance and coupling. This segmentation allows the complex 3D winding structure to be manufactured using automated wire winding machines that can precisely control the spatial positioning of each segment, making the complex structure manufacturable while maintaining high Q factor and reliable power transfer.
Solution Approach 2:
The patent optimizes critical parameters including wire diameter (28-34 gauge), winding pitch, layer spacing, and turn density to achieve the desired Q factor and coupling efficiency. By carefully controlling these parameters during manufacturing, the patent maintains high power transfer reliability while using standard fabrication processes that balance complexity with manufacturability.
3Loss of energy
If the coil size is increased to improve coupling, then power transfer efficiency improves, but the device dimensions and comfort are compromised
Solution Approach 1:
The patent uses non-magnetic, biocompatible materials such as platinum-iridium or gold alloys for the conductor, combined with flexible insulating coatings. These composite material choices allow the coil to maintain high electrical conductivity and magnetic properties while being flexible enough to conform to the recipient's anatomy, achieving good coupling efficiency without excessive size or discomfort.
Solution Approach 2:
The patent employs curved and flexible coil designs that can conform to the contours of the recipient's body and skull shape. Rather than rigid circular windings, the coil structure incorporates flexible segments and curved pathways that adapt to anatomical surfaces, maintaining effective coupling area without increasing the linear dimensions that would cause discomfort or interfere with normal activities.
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
The new coil configuration reduces electric fields and improves the Q factor, ensuring reliable and efficient power and data transmission for hearing prostheses, enhancing their performance and safety.
Implementation Method 1
inductance communication coil, comprising a coiled conductor including at least three turns on a first tier and a plurality of turns on a second tier
Data Source
AI summary
A coil, such as, by way of example, an inductance communication coil, that includes a conductor including a first portion extending in a first level and a second portion extending in a second level, wherein the conductor includes a third portion located on a different level than that of the second portion, wherein an electrical path of the conductor is such that the second portion is located between the first portion and the third portion.