Battery Housing Integrating Inductive Coil for Implantable Devices
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Solution Overview
Problem
In implantable devices, the small size restricts battery energy storage, requiring frequent recharging and posing challenges in optimizing the inductive link's energy efficiency due to limited coil size and precise dimensioning requirements for communication elements.
Innovation Solution
The battery housing is designed with structural features to precisely position and fix the signal transferring element, such as an inductive link, optimizing space use and reducing eddy currents by integrating the coil directly around the battery housing, which allows for accurate and reproducible coil placement and formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the device size is reduced to make implantable devices smaller and less invasive, then the device becomes more compliant with movement and easier to implant, but the battery energy storage capacity is restricted requiring frequent recharging
Solution Approach 1:
The battery housing is merged with the coil former structure, combining two previously separate components into one integrated unit. This eliminates the need for a separate coil former, reduces overall device volume, and allows the coil to be wound directly around the battery housing, maximizing the use of limited space while maintaining adequate energy storage capacity
Solution Approach 2:
The coil is nested around the battery housing, with the signal transferring element positioned in the annular space between the battery housing and the outer device housing. This nested arrangement optimizes space utilization by using the vertical space around the battery rather than requiring additional horizontal space
2Loss of energy
If the induction coil area is increased to maximize energy efficiency of the inductive link, then the magnetic coupling with the external-unit coil improves and recharge time decreases, but the device volume increases
Solution Approach 1:
By merging the battery housing and coil former into a single structure, the coil can be positioned closer to the battery with optimized winding geometry. The annular configuration allows maximum coil area within the limited radial space, improving magnetic coupling efficiency without increasing overall device volume
Solution Approach 2:
The coil is arranged in an annular configuration around the battery housing, utilizing the vertical and radial dimensions rather than only horizontal plane. This three-dimensional arrangement maximizes the enclosed area for magnetic flux while fitting within the constrained device volume
3Manufacturing precision
If communication elements like coils and antennas are precisely dimensioned and positioned with respect to nearby conductive structures, then specific inductances and resonance characteristics are achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The battery housing serves dual functions as both the battery container and the coil former. The housing includes integrated structural features such as ledges, flanges, and recesses that provide precise mechanical positioning for the coil windings. This integration eliminates the need for separate coil formers and reduces assembly steps while maintaining precise coil geometry for consistent inductance and resonance characteristics
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
This approach enhances energy efficiency, minimizes recharge time, and maintains optimal functioning of both the battery and signal transferring elements, ensuring consistent and reproducible performance.
Implementation Method 1
Batteries in small implantable devices therefore require frequent recharge, typically wirelessly through the skin over an inductive link
Implementation Method 2
The larger the area enclosed by the implanted-device coil, the higher its magnetic coupling with the external-unit coil and the better the energy efficiency of the wireless link
Implementation Method 3
a battery as well as an inductive link for providing data and/or power signal transferring
Data Source
AI summary
A battery housing for use in an active implantable medical device comprising a battery and a signal transferring element is described. The battery housing is adapted for holding the signal transferring element at a fixed position around the battery housing. A corresponding implantable device also is disclosed.