Related Experiment Video
Updated: Jun 10, 2026
08:17
Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa
Published on: September 27, 2018
Modification of immediately electrically detachable coil
1Department of Neurosurgery, Kyoto University, School of Medicine; Kyoto, Japan.
Summary
A modified immediately electrically detachable coil (IEDC) uses an insulated wire to reliably detach the platinum coil from the delivery wire, even when the junction is far from the catheter tip.
Area of Science:
- Biomedical Engineering
- Medical Devices
- Materials Science
Background:
- The previously developed immediately electrically detachable coil (IEDC) required precise positioning of the junction outside the catheter tip for reliable detachment.
- Detachment of the original IEDC relied on heating and disrupting a junction between a platinum coil and a delivery wire using high-frequency electrical current.
Purpose of the Study:
- To enhance the reliability of the IEDC detachment system.
- To enable detachment of the IEDC even when the junction is not precisely positioned at the catheter tip.
Main Methods:
- Modification of the IEDC by insulating the delivery wire with poly tetra fluoroethylene (PTFE).
- Testing the modified IEDC in vitro and in animal experiments to assess detachment reliability.
- Applying monopolar high-frequency electrical current to heat and disrupt the junction.
Main Results:
- The modified IEDC demonstrated consistent and instantaneous detachment.
- Detachment occurred reliably even when the junction was positioned far beyond the catheter tip.
- Insulation of the delivery wire concentrated the electrical current at the junction, producing sufficient heat for disruption.
Conclusions:
- The modified IEDC with an insulated delivery wire significantly enhances detachment reliability.
- This improved IEDC design overcomes the precise positioning limitations of the original device.
- The PTFE-insulated wire effectively concentrates current for reliable coil detachment in medical procedures.
Related Concept Videos
01:16Induction
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
A...
01:14Design Example: Automobile Ignition System
The automobile's ignition system plays a vital role by ensuring the timely ignition of the fuel-air mixture in each cylinder. This ignition is facilitated by a spark plug, which is composed of two electrodes separated by an air gap. A spark forms across this air gap when a substantial voltage is generated between the electrodes, leading to the ignition of the fuel.
One can generate a large voltage using a car battery of 12 volts with the help of inductors. Inductors are known for opposing rapid...
One can generate a large voltage using a car battery of 12 volts with the help of inductors. Inductors are known for opposing rapid...
01:15Charging Conductors By Induction
The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
01:27Induced Electric Fields: Applications
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
01:17Force On A Current Loop In A Magnetic Field
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
01:24Mutual 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...
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...