Nucleus® implants

Cochlear™ has a range of implants and electrodes for your type of hearing loss and cochlea anatomy. Discover what sets Nucleus® implants apart.

Otolaryngologist, Dr Robert Gunn, assesses cochlear implant surgery scans.

What you'll find on this page

  • How we design Cochlear™ Nucleus® implants.
  • The Cochlear Nucleus implant portfolio.
  • The link between electrode design and hearing performance.

Cochlear's implant design philosophy

  • Designed to last.

  • Produce superior hearing performance.

  • Suit the unique anatomy of your ear.

  • Support advances in sound processor technology.

World's thinnest implant: Cochlear™ Nucleus® Profile™ Implant

The Nucleus Profile and Profile Plus Series implants are the thinnest in the world.*

They are designed with a flexible coil to better fit the natural shape of your head.

Profile Series implants also have a high impact resistance — up to 2.5 joules — which meets the European standards for impact testing.

Industry-leading design for hearing performance

The anatomy of the cochlea varies from person to person. That's why we offer a range of electrode shapes and lengths. Your surgeon will decide which one is best for you.

Unique features of Cochlear's electrodes and implants include:

  • 22 active contacts for maximum frequency coverage along the hearing nerve.

  • The world's thinnest full-length electrode.

  • The Hybrid™ L24 Electrode+ that is specifically designed and approved to preserve hearing.

  • Electrodes which sit closest to the hearing nerve for your best hearing performance.1,2

  • Best long-term implant reliability record in the industry.*3

Electrode placement critical to hearing performance

Surgeons place Cochlear's electrodes where hearing nerve stimulation is most effective and where they expect that you may benefit from the full range of sound.

This area is known as the hearing zone. It is the area closest to the hearing nerve, the target of electrical stimulation.4

Clinical research shows that inserting an electrode beyond the hearing zone is associated with deterioration in performance. It can also damage the delicate cochlear structures.4,5

Correct insertion depth — along with the highest number of active contacts in the industry (22 electrodes) — help to give you the full spectrum of sound and a richer hearing experience.

Built for MRI compatibility

We designed the Nucleus Profile™ Plus Series Implant so you can have a routine 1.5 T MRI or high-definition 3.0 T MRI without removing its magnet**. This means no additional surgery, no need to wear a bandage in the MRI machine, no waiting for your scan and, most importantly, no unnecessary time without sound.

Because we were the first manufacturer to introduce removable magnets, more Cochlear recipients have MRI-compatible implants than any other cochlear implant brand. Even a person implanted many years ago can access today’s MRI technology***.


Please seek advice from your health professional about treatments for hearing loss. Outcomes may vary, and your health professional will advise you about the factors which could affect your outcome. Always read the instructions for use. Not all products are available in all countries. Please contact your local Cochlear representative for product information.

For a full list of Cochlear’s trademarks, please visit our Terms of Use page.

* Based on latest generation of cochlear implants manufactured by Cochlear, Advanced Bionics, Oticon Medical available as at 31 December 2017.

**The following implants are designed to be compatible for MRI at 1.5 T and at 3.0 T with the magnet in place: Nucleus Profile Plus: CI612, CI622, CI632.

***The following implants are designed to be compatible for MRI at 3.0 T with the magnet removed (should your doctor specifically recommend this procedure) and at 1.5 T with magnet in place with use of the Cochlear Nucleus Implant Bandage and Splint Kit: Nucleus Profile: CI512, CI522, CI532. Nucleus CI24RE: CI422, CI24REH, CI24RE(CA), and CI24RE(ST)


  1. Holden LK, Finley CC, Firszt JB, Holden TA, Brenner C, Potts LG, et al. Factors affecting open-set word recognition in adults with cochlear implants. Ear Hear.2013 May-Jun;34(3):342-60.

  2. Esquia (2013): Esquia Medina, GN., Borel, S., Nguyen, Y., Ambert-Dahan, E., Ferrary, E., Sterkers, O., Bozorg Grayeli, A. Is Electrode-Modiolus Distance a Prognostic Factor for Hearing Performances after Cochlear Implant Surgery. Audiol Neurotol. 2013;18:406-413. DOI: 10.1159/000354115.

  3. Cochlear Limited, 454378. Comparison of reliability of cochlear implants commercially available (as at 31 December 2017). Data on file. Based on latest generation of cochlear implants manufactured by Cochlear, Advanced Bionics, Oticon Medical, and MED-EL available as at 31 December 2017.

  4. Ariyasu, L., Galey, FR., Hilsinger, RJR., Byl, FM. Computer-generated three dimensional reconstruction of the cochlea. Otolaryngology - Head and Neck Surg 1989; 100(2): 87.

  5. Gani M, Valentini G, Sigrist A, Kos MI, Boex C. Implications of deep electrode insertion on cochlear implant fitting. J Assoc Res Otolaryngol. 2007 Mar; 8(1):69-83.