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Related Experiment Video

Updated: Jun 10, 2026

Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa

Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa

Published on: September 27, 2018

Modification of immediately electrically detachable coil.

A Sadato¹, A Ogawa, W Taki

¹Department of Neurosurgery, Kyoto University, School of Medicine; Kyoto, Japan.

Interventional Neuroradiology : Journal of Peritherapeutic Neuroradiology, Surgical Procedures and Related Neurosciences

|July 31, 2010

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.

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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.