Ferrite Core Antenna for Medical Implant Magnetic Field Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing medical implants face challenges in efficiently communicating with external units using inductive coupling, particularly in minimizing distortion of magnetic fields and ensuring reliable power and data transmission, especially in environments with interference.
Innovation Solution
The implementation of an antenna unit with a ferrite core and encapsulation design that minimizes magnetic field distortion, combined with circuitry that modulates load impedance and uses a voltage clamping element to regulate power, and a noise compensation antenna to mitigate interference, allowing for efficient data transmission and power reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inductive coupling is used for power and data transmission, then wireless communication is enabled, but magnetic field distortion occurs reducing transmission reliability
Solution Approach 1:
A ferrite core is introduced as an intermediary material between the antenna and the surrounding environment. The ferrite core concentrates and guides the magnetic field lines, acting as a mediator that maintains magnetic field integrity and reduces distortion caused by surrounding materials or geometry, thereby improving transmission reliability while preserving wireless communication capability
Solution Approach 2:
The patent employs composite material structures combining ferrite core with antenna elements and encapsulation materials. This composite approach optimizes magnetic field distribution by leveraging the complementary properties of different materials - the ferrite for magnetic field concentration and the encapsulation for protection and geometric stability, thus resolving the contradiction between wireless operation and field reliability
2Stability of the object's composition
If voltage clamping is applied to regulate power, then voltage stability is improved, but power transmission efficiency decreases
Solution Approach 1:
The voltage clamping circuit operates periodically, engaging only when voltage exceeds the clamping threshold. This periodic action maintains voltage stability during over-voltage conditions while minimizing interference with normal power transmission, thus reducing energy loss compared to continuous clamping mechanisms
Solution Approach 2:
The clamping voltage level is carefully selected and adjusted to match the operational requirements of the implant circuitry. By optimizing the clamping parameter, the system maintains adequate voltage stability while minimizing the frequency and duration of clamping events, thereby reducing power loss and improving overall transmission efficiency
3Loss of information
If load impedance modulation is used for data transmission, then communication capability is enhanced, but power regulation precision deteriorates
Solution Approach 1:
The system separates the power regulation and data transmission functions into distinct operational phases or circuits. The voltage clamping circuit handles power regulation independently, while the load impedance modulation handles data transmission, reducing the interference between these functions and maintaining both data communication capability and power regulation precision
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor both power levels and data transmission quality. This feedback allows for dynamic adjustment of operating parameters to maintain power regulation precision even during load impedance modulation for data transmission, resolving the contradiction between enhanced communication and precise power control
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 solution enables reliable and efficient communication and power transfer with reduced implant size and cost, while maintaining communication reliability and voltage regulation performance, even in the presence of interference.
Implementation Method 1
The antenna is configured to communicate with an external unit using inductive coupling of a magnetic field
Implementation Method 2
The voltage clamping element is coupled to clamp a voltage induced by the magnetic field across the antenna so as to maximize a modulation depth of the load impedance, and so as to regulate the electrical power that powers the circuitry
Implementation Method 3
The circuitry is configured to produce data for transmission to the external unit, to modulate a load impedance applied to the antenna as a function of the data so as to transmit the data
Data Source
AI summary
An implant (110) includes an antenna unit (130) and an encapsulation. The antenna unit includes an elongated ferrite core (142) having a first length and an antenna coil (146) wound around the ferrite core, and is configured to communicate with an external unit (120) using inductive coupling of a magnetic field. The encapsulation encapsulates the antenna unit, and includes one or more openings (134) that are aligned with the ferrite core and have respective second lengths that are equal to or greater than the first length of the ferrite core.