Quick Tips: Cochlear Nucleus Depth Gauges


Welcome to Cochlear™ Quick Tips.  The purpose behind Quick Tips is to give you “bite-sized” information that you can use when working with our products.  In this first edition, we will discuss Cochlear™ Nucleus® Depth Gauges.

What is a depth gauge?

  • Depth gauges are surgical components that utilize the same materials and have the same handling characteristics as “live” electrode arrays

When should a Depth Gauge be considered?

  • To aid in assessing the patency of the cochlea lumen if pre-operative imaging is inconclusive or unavailable
  • To assess if insertion depth is adequate
  • To assist in determining the most appropriate implant model
  • During explant/re-implant procedures

What Depth Gauges are available?

  • Cochlear has two types of depth gauges: the Contour Advance Depth Gauge and Straight Depth Gauge
  • The Contour Advance Depth Gauge is more commonly used of the two depth gauge options. This is due to its benefits in obstruction/fibrosis/ossification, common cavity, incomplete partition, and cochlear hypoplasia cases

Can I see an example of how this can be used?

Anything else I should know?

  • Depth gauges are not approved for use as an implant or stent. 
  • Monopolar electrocautery should not be performed with a depth gauge in position.
  • The Straight Depth Gauge DOES NOT have the same the same dimensions or handling characteristics as the Slim Straight electrode and does not have a smooth lateral surface or basal support​.  Size differential between slim straight and straight electrode arrays may create false-positive or false-negative feedback with use​. 
  • For more information, please reach out to your local Cochlear representative or call Cochlear’s Surgical-on-Call at (877) 279-5411.

To learn more about Cochlear™ Nucleus® Implants, visit our website

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