32
Views
7
CrossRef citations to date
0
Altmetric
Original Article

A New Electrode (HIM-5) for CM Measurement in Extratympanic Electrocochleography

, &
Pages 7-16 | Received 13 Dec 1996, Accepted 05 May 1997, Published online: 07 Jul 2009
 

Abstract

A new electrode (HN-5) for measuring cochlear microphonics (CMs) in extratympanic (ET) electrocochleography (ECochG) has been developed. The HN-5 electrode consists of a silver wire 2 mm in diameter and 5.0 cm in length connected to a low noise cable. The HN-5 electrode showed low impedance and excellent frequency characteristics. Using the dummy ear, artefact contamination tests, such as electromagnetic induction and mechanical vibration, were performed with the HN-5 electrode and various other electrodes. In the HN-5 electrode, artefact contaminations were kept within acceptable noise levels, whereas in the smaller electrodes, the measurable artefact contaminations were larger. The CMs were measured from subjects with normal hearing. CM findings obtained using the HN-5 electrode did not differ from those obtained by transtympanic (TT) ECochG, apart from their amplitude. HN-5 overcame the major disadvantage of the ET ECochG and provided a very favourable signal-to-noise ratio, resulting in repeatable response signals averaged from the same relatively small number of samples as those of TT ECochG. This resulted in successful CM measurements of ET ECochG.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.