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07 08
Operation Manual of Cochlear Implant
CS-10A series cochlear implant is MRI Conditional for 1.5T or 3.0T closed bore MRI scanning.
There is a small chance that during MRI, the implant magnet could dislocate from the retainer
implant if not properly bonded; the magnet strength may change; Patients may feel discomfort or
pain at the implant site. The magnet and the titanium case shell of implant cause artifact (please
see pictures below). 1.5T MRI can be performed with the implant magnet in place if the bandaging
procedure of implant magnet is followed. For 3T MRI, the implant magnet must be removed by a
qualified surgeon.
16 Interference to and Removal of Cochlear Implant
16.1 Interfering devices
1) Monopole electro surgical apparatus is strictly prohibited.
2) Nurotron cochlear implant CS-10A is MR Conditional. Before MRI examination, the patient
should clearly inform Nurotron of which MRI examination is to be performed. The patient can
contact local Nurotron staff or Nurotron clinical personnel through customer service hotline (+86)
400-6333571 (China Headquarter), or (+34) 932547930 (European Representative). Before MRI,
the patients should see their implantation surgeon to make sure they are safe to take MRI
examination.
family shall have a practical expectation upon the effect of cochlea.
3) Always ensure asepsis of implant.
4) Make sure no falling of implant on hard objects.
5) Mechanical damages may result in implant failure, such as due to bump on head or other
technical failure of electronic device or implant. In case of any technical failure, re-implantation
is necessary.
6) Before implantation surgery, patients are suggested taking fitting test of hearing aid. Patients
suffering deafness caused by infectious diseases (such as meningitis) are advised to take cochlear
implantation immediately. To achieve the best, patients who are ready to take cochlear
implantation and their families shall be highly enthusiastic about cochlear implantation and hold
a suitable expectation. Meanwhile, they shall understand the importance of periodic fitting of
speech processor programs, evaluation and speech therapy.
MRI Warnings
Do not allow patients with a CS-10A cochlear implant to be in the area of an MRI scanner unless
the following conditions have been met:
● The external sound processor and headpiece are removed before entering a room where an MRI
scanner is located.
● Patient has no fever.
● For 3T MRI, implant magnet should be removed by a qualified surgeon.
● For 1.5T MRI with implant magnet in position, the bandaging procedure in Nurotron’s MRI
examination guide should be followed, to avoid magnet movement, patient discomfort, or trauma
and pain to the patient.
● Caution: The bandaging procedure in Nurotron’s MRI examination guide was developed to
prevent magnet displacement and counteract magnet torque during a 1.5T MRI procedure, but
some discomfort and pain at the implant site may still be experienced. Please consult with your
physician if this is an issue.
3) The influence of thermal healing process, nerve stimulation, electric shock, ionizing radiation,
cobalt therapy, positive electron section scan, transcranial ultrasound, linear acceleration,
high-energy electric field and defibrillator upon implant are unknown, and these treatment
methods are not suggested temporarily.
16.2 Removal of cochlear implant
If implant is not in normal working condition due to accidents, medical or technical reasons, it is
better to be taken out of body. If not, periodic functional check of the implant is suggested.
Ex-plantation may result from different reasons:
If it is caused by the implant failure or upgradation, please incise the skin to expose the implant
and electrode wire to the point of round window or the original fenestration. Gently remove the
sclerotin around implant and electrode wire, and then remove the previous implant. After that,
please insert in the new implant and make sure it is properly fixed. And please send the ex-planted
implant back to NUROTRON.
If it is caused by skin infection, please incise the skin to expose the implant, and cut the electrode
wire in a proper position to preserve the intra-cochlear electrode, which benefits the
re-implantation. Then remove the stimulator and receiving coil and send back to NUROTRON.
Anti-infection treatment shall be provided and infected wound drainage shall be provided if
necessary.
If it is caused by labyrinthitis, please remove the whole implant including coil, stimulator and
intra-cochlear electrode at once. And take care of the wound accordingly.
After the implant is taken out, it shall be suitably cleaned and sterilized, and body tissue shall
