Wireless Power Resonator Core Cavity Heat Management
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Solution Overview
Problem
Existing wireless power transfer systems for ventricular assist devices generate excessive heat and are bulky due to the size of the implantable receive resonator, which can negatively impact tissue health and device efficiency.
Innovation Solution
A wireless power transfer resonator design featuring a core with an annular groove and a cavity on the back surface, where a coil element is positioned within the groove, reducing heat generation and size while maintaining electromagnetic functionality, and potentially incorporating electronics components within the cavity to further minimize size and heat impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the implantable receive resonator is designed with traditional structure, then wireless power transfer capability is achieved, but heat generation is excessive and device size is large
Solution Approach 1:
The resonator core is segmented into multiple regions including front surface, back surface, annular sidewall, annular groove, and cavity. This segmentation allows strategic placement of coil elements and electronic components to optimize heat distribution and reduce peak temperatures in tissue-contacting regions.
Solution Approach 2:
Electronic components are relocated from traditional planar arrangements to a three-dimensional cavity structure within the core. This dimensional change allows better thermal management by distributing heat-generating components throughout the core volume rather than concentrating them on surfaces.
2Volume of moving object
If the implantable receive resonator is designed with traditional structure, then wireless power transfer capability is achieved, but device size is large
Solution Approach 1:
The coil element is nested within the annular groove of the core, and electronic components are nested within the cavity. This nesting arrangement maximizes space utilization within the resonator volume, reducing overall device size while maintaining all necessary functional elements.
Solution Approach 2:
The coil element and electronic components are integrated into the core structure itself rather than being separate external components. The coil is merged with the annular groove and electronics are merged with the cavity, creating a compact unified structure that reduces overall volume.
3Temperature
If coil element is positioned in annular groove with cavity in core, then heat generation is reduced, but structural complexity increases
Solution Approach 1:
The core structure serves multiple functions simultaneously: it provides mechanical support, defines the magnetic field geometry through the annular groove, houses the coil element, contains electronic components in the cavity, and manages heat distribution. This multi-functionality reduces the need for separate dedicated structures for each function.
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 resonator design reduces heat generation by diverting heat to the back side, decreases the overall size by relocating components, and maintains effective wireless power transfer capabilities without compromising electromagnetic properties, thus minimizing tissue impact and enhancing device efficiency.
Implementation Method 1
a coil element disposed within the annular groove
Implementation Method 2
reduces heat generation by diverting heat to the back side
Data Source
AI summary
A resonator for use in a wireless power transfer system is provided. The resonator includes a core including a front surface, a back surface, and an annular sidewall extending between the front surface and the back surface, wherein an annular groove is defined in the front surface and surrounds a post, and wherein a cavity is defined in the back surface, the post and the cavity aligned with a longitudinal axis of the core. The resonator further includes a coil element disposed within the annular groove.