Improvements to the retractor and muscle flap design for minimally invasive cochlear implantation

Objective

The aim of this study was to improve muscle flaps and to evaluate surgical outcomes with the use of a novel specialized retractor, which is a surgical instrument used to locate and shape a bony seat for minimally invasive cochlear implantation.

Methods

50 patients aged 1-75 years with sensorineural hearing loss who required cochlear implantation were recruited. A small incision (<3 cm) was made, and the novel specialized retractor was used in the study group during cochlear implantation. The incision length, surgical outcomes and operative time were recorded and analyzed.

Results

The incision length, total operative time and drilling bony time were shorter in the study group than in the control group (P < 0.05, respectively). All patients recovered well after the surgery without any severe complications.

Conclusion

The use of a novel specialized retractor standardized the surgical processes of cochlear implantation. The retractor helped locate and control the size of the bony well during bone drilling. The tool reduced the technical difficulty and improved the efficacy of this minimally invasive operation.

Cochlear Implantation in Children with Otitis Media

One of the concerns during the cochlear implant candidacy process is the presence of chronic otitis media which could delay the implantation process. The aim of this study was to evaluate the surgical difficulties and the long-term complications in children with otitis media and to examine whether it is necessary to delay the implantation until the infection is resolved. The study used a comparative retrospective design based on chart review of all patients who received their implant(s) from January to December of 2012. A total of 200 patients were identified and were followed for 4 years post surgery. Patients were divided into three groups based on their history of otitis media (non-otitis media, chronic otitis media with effusion, and acute otitis media). Data included long-term complications, operative time and duration from first clinical visit to the time until implantation was received. None of study participants had long-term complications during the study period. The operative time was longer in the acute otitis media group with a difference of 45 min. The average delay in cochlear implantation due to the presence of otitis media in chronic group was more than 5 months. Pediatric patients with otitis media could be implanted in one stage safely and effectively.

Financial Benefits of the Early Fitting of a Cochlear Implant Speech Processor: Assessment of the Direct Cost

Objective

Cochlear implants (CIs) are typically activated four weeks after the implantation surgery. This delay between device implantation and activation lengthens the implant process and consequently induces personal and financial burdens for some patients who travel from remote regions to receive the surgery. However, fitting the speech processor and eliminating the waiting period could decrease the indirect cost associated with cochlear implantation. The objective of this study was to assess the impact of an early CI fitting on the overall cost paid by patients and their families aiming to improve future care strategies for patients receiving CIs.

Methods

This retrospective study was conducted in a tertiary referral center. All patients who received any kind of CI with early fitting of the speech processor were included. The total financial benefit for the patients and their families over the standard activation visit was investigated by assessing the cost of the non-medical expense for one hospital visit.

Results

Our results showed that the non-medical cost for each hospital visit associated with cochlear implantation was higher for those who traveled from remote areas: 81 USD for each patient within 200 km of the implantation center and 748.56 USD for each patient farther than 200 km from the implantation center.

Conclusions

Using the early fitting approach, some of the financial burden associated with implantation could be alleviated.

Complications in a series of 4400 paediatric cochlear implantation

OBJECTIVES

The purpose of this study is to retrospectively review the complications of paediatric patients undergoing cochlear implantation at four major Iranian cochlear implant centres.

METHODS

A retrospective analysis was performed of all patients who underwent primary cochlear implantation from January 1991 to December 2013. The patients were reviewed for demographic information, and complications including cerebrospinal fluid leak, meningitis, facial palsy, and wound infection.

RESULTS

4400 records were reviewed. Fifty-four patients were lost to follow-up; therefore, 4346 records were analysed. The most common aetiology of hearing loss was non-syndromic genetic sensori-neural hearing loss (69%). Other less common aetiologies of hearing loss included TORCH (Toxoplasmosis, Other infections, Rubella, Cytomegalovirus, Herpes) (11%), syndromic hearing loss (7%), ototoxicity (5%), and autoimmune inner-ear disease (4%). The most common major complications were CSF leak (0.4%), skin necrosis (0.2%), meningitis (0.1%), facial paralysis (0.07%) and massive haemorrhage (0.05).

CONCLUSION

Cochlear implantation continues to be reliable and safe in experienced hands, with a very low percentage of severe complications.

Biomaterials in cochlear implants

The cochlear implant (CI) represents, for almost 25 years now, the gold standard in the treatment of children born deaf and for postlingually deafened adults. These devices thus constitute the greatest success story in the field of ‘neurobionic’ prostheses. Their (now routine) fitting in adults, and especially in young children and even babies, places exacting demands on these implants, particularly with regard to the biocompatibility of a CI’s surface components. Furthermore, certain parts of the implant face considerable mechanical challenges, such as the need for the electrode array to be flexible and resistant to breakage, and for the implant casing to be able to withstand external forces.

As these implants are in the immediate vicinity of the middle-ear mucosa and of the junction to the perilymph of the cochlea, the risk exists – at least in principle – that bacteria may spread along the electrode array into the cochlea. The wide-ranging requirements made of the CI in terms of biocompatibility and the electrode mechanism mean that there is still further scope – despite the fact that CIs are already technically highly sophisticated – for ongoing improvements to the properties of these implants and their constituent materials, thus enhancing the effectiveness of these devices.

This paper will therefore discuss fundamental material aspects of CIs as well as the potential for their future development.

Keyhole cochlear implantation surgery

A limited access 'keyhole' cochlear implantation (CI) surgical technique is presented. The surgery employs a 15-18 mm diameter C-incision on the rear of the auricle. The implant is retained in a snug pericranial pocket. A bony retention well is avoided. Minimal mastoid cell clearance is used. The surgery is brief, atraumatic and well suited to small infant cases. Used in 315 sequential routine CI cases from 1997-2007, the complication rates compare favourably with past reports. The outcomes of the series question the use of larger incisions and implant retention wells. Current implant designs should be modified for better adaptation to the cranial contours.