Ferrite-Covered Implantable Receiver for Wireless Power
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Solution Overview
Problem
Conventional wireless power transmission systems for implantable medical devices are sensitive to coil alignment and position, require large coils for efficient power transfer, which complicates surgical placement and increases the risk of overheating, and are susceptible to external interference.
Innovation Solution
An implantable receiver with a ferrite-covered housing that magnetically shields and redirects incoming magnetic flux, allowing for efficient power transfer over a wider range of coil orientations and reducing interference from external factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the transmission coil is made larger to increase magnetic flux field, then power transfer efficiency is improved, but device complexity and risk of overheating increase
Solution Approach 1:
A ferrite core is introduced as an intermediary material between the transmitter and receiver coils. The ferrite core concentrates and guides magnetic flux, enabling efficient power transfer without requiring large coil sizes. This mediator allows the system to achieve high coupling coefficients while maintaining compact dimensions, thereby improving power transfer efficiency without increasing device complexity or overheating risk
Solution Approach 2:
The patent changes the magnetic properties of the transmission path by introducing ferrite material with high permeability. This parameter change concentrates magnetic flux in specific regions, enhancing the coupling between coils without requiring increased coil size. The ferrite core's magnetic parameters enable efficient flux confinement and direction, resolving the contradiction between compact size and power transfer efficiency
2Adaptability or versatility
If the transmission coil is made larger to ensure efficient power transfer, then freedom of movement is improved, but quality of life decreases due to larger, heavier coil
Solution Approach 1:
The ferrite core acts as a magnetic flux concentrator that enables compact coil design. By concentrating flux in the ferrite material, the system achieves efficient power transfer with smaller, lighter coils that can be freely positioned and moved without compromising performance, thereby improving both adaptability and reducing weight
3Ease of operation
If conventional wireless power transmission is used, then power can be transmitted wirelessly, but the system is highly susceptible to interference from external factors
Solution Approach 1:
The ferrite core, which could potentially be affected by external magnetic fields, is instead used to actively shield and protect the coil system. The high permeability ferrite material attracts and confines magnetic flux within defined paths, preventing external interference from disrupting the power transfer. This converts the ferrite's magnetic susceptibility from a potential vulnerability into a protective feature that reduces interference susceptibility
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 ferrite-covered receiver enhances power transfer efficiency and reduces the risk of overheating and interference, enabling more flexible implantation and stable operation of implantable medical devices.
Implementation Method 1
the covering is formed of a ferrite material configured to both magnetically shield a respective portion of the internal volume and redirect incoming magnetic flux
Implementation Method 2
the covering is formed of a ferrite material configured to both magnetically shield
Implementation Method 3
implantable receiver for wirelessly receiving energy from a transmitter
Implementation Method 4
Resonant power transmission coils and systems
Data Source
AI summary
An improved wireless transmission system for transferring power over a distance. The system includes a transmitter generating a magnetic field and a receiver for inducing a voltage in response to the magnetic field. In various respects, the receiver is configured to be implanted in a body. The receiver may include a housing enclosing a receiving coil and associated electronic components, a covering around at least a portion of the housing, and at least two wires wrapped around the housing to form a plurality of turns. The covering may be formed of a ferrite material configured to both magnetically shield a respective portion of the internal volume of the housing and redirect incoming magnetic flux from the transmitter to improve efficiency. Methods of use are also provided.