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Related Concept Videos

Mutual Inductance01:24

Mutual Inductance

Inductance is the property of a device that tells us how effectively it induces an emf in another device. In other words, it is a physical quantity that expresses the effectiveness of a given device.
When two circuits carrying time-varying currents are close to one another, the magnetic flux through each circuit varies because of the changing current in the other circuit. Consequently, an emf is induced in each circuit by the changing current in the other. Therefore, this type of emf is called...
Self-Inductance01:24

Self-Inductance

Mutual inductance arises when a current in one circuit produces a changing magnetic field that induces an emf in another circuit. On the other hand, self-inductance arises when the current passing through the circuit changes, creating a changing magnetic flux, resulting in inductance in the same circuit.
Consider a circuit connected to an AC source. As the current varies with time, the magnetic flux through the circuit correspondingly changes. Faraday's law tells us that an emf would therefore...
Calculation of Self-inductance01:29

Calculation of Self-inductance

The self-inductance of a circuit, often simply called the inductance, is a purely geometric factor that depends only on the circuit component's structure. More specifically, it depends on the shape and size of the component that lets the flux pass through it, thus inducing an electric field that opposes any current passing through it.
Since the effect of the induced electric field and the back EMF generated depends on the rate of change of current and the self-inductance, the inductance...
Inductance: Solid Cylindrical Conductor01:24

Inductance: Solid Cylindrical Conductor

To calculate the inductance of a solid cylindrical conductor, consider a 1-meter section of a non-magnetic, current-carrying conductor with radius r. Disregarding end effects and assuming uniform current density, Ampere's law helps determine the magnetic field inside the conductor. This law states that the magnetic field intensity H is concentric and constant within the conductor.
Given the uniform current distribution, the magnetic field Hx and flux density Bx inside the conductor are...
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
Inductors01:11

Inductors

An inductor is a passive component built to store energy within its magnetic field. It can be fabricated by coiling a wire around a magnetic core. When current is permitted to flow through this inductor, it is observed that the voltage across the inductor is directly proportional to the time rate of change of the current. Mathematically,

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Related Experiment Video

Updated: May 14, 2026

The DREAM Implant: A Lightweight, Modular, and Cost-Effective Implant System for Chronic Electrophysiology in Head-Fixed and Freely Behaving Mice
08:42

The DREAM Implant: A Lightweight, Modular, and Cost-Effective Implant System for Chronic Electrophysiology in Head-Fixed and Freely Behaving Mice

Published on: July 26, 2024

Implant positioning system using mutual inductance.

You Zou1, Stephen O'Driscoll

  • 1Solid-State Circuits Research Lab, Department of Electrical and Computer Engineering at the University of California, Davis, One Shields Avenue, Davis, CA 95616, USA. youzou@ucdavis.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|February 1, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a new system for precisely locating implantable medical devices (IMDs) without increasing their size or power needs. The method uses magnetic field variations to achieve millimeter-level positioning accuracy for medical implants.

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Area of Science:

  • Biomedical Engineering
  • Medical Device Technology
  • Implantable Medical Devices

Background:

  • Surgical placement of implantable medical devices (IMDs) lacks precision, and devices can shift post-implantation.
  • Accurate IMD positioning is crucial for data interpretation and efficient wireless power transfer.
  • Current positioning methods are too large and power-hungry for mm-sized in-vivo applications.

Purpose of the Study:

  • To develop a novel, non-invasive positioning system for mm-sized implantable medical devices.
  • To enable precise localization of IMDs without increasing their size or power consumption.
  • To improve the reliability and functionality of in-vivo medical devices.

Main Methods:

  • Replaced the external transmitting coil of a wireless power transfer system with an array of smaller coils.
  • Measured mutual inductance between the external coil array and the implanted receiving coil.
  • Utilized spatial variations in mutual inductance and a particle swarm algorithm for position estimation.

Main Results:

  • Demonstrated the feasibility of the novel implant positioning scheme through mathematical analysis and electromagnetic simulations.
  • Achieved an estimated positioning accuracy on the order of 1 mm using MATLAB simulations.
  • The proposed method does not add hardware or power requirements to the implantable device.

Conclusions:

  • The developed system offers a viable solution for accurate, low-power positioning of mm-sized IMDs.
  • This technology can enhance the performance and utility of future implantable medical devices.
  • Precise IMD localization is achievable through analysis of magnetic field variations.