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Blank T, Ahrens AM, Klose C, Canadinç D, Lenarz T, Maier HJ. Investigating mechanical deformation's role in cochlear implant durability. PLoS One 2024; 19:e0306613. [PMID: 38980854 PMCID: PMC11232988 DOI: 10.1371/journal.pone.0306613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Accepted: 06/21/2024] [Indexed: 07/11/2024] Open
Abstract
Platinum and platinum-based alloys are used as the electrode material in cochlear implants because of the biocompatibility and the favorable electrochemical properties. Still, these implants can fail over time. The present study was conducted to shed light on the effects of microstructure on the electrochemical degradation of platinum. After three days of stimulation with a square wave signal, corrosive attack appeared on the platinum surface. The influence of mechanical deformation, in particular rolling, on the corrosion resistance of platinum was also prominent. The cyclic voltammetry showed a clear dependence on the electrolyte used, which was interpreted as an influence of the buffer in the artificial perilymph used. In addition, the polarization curves showed a shift with grain size that was not expected. This could be attributed to the defects present on the surface. These findings are crucial for the manufacture of cochlear implants to ensure their long-term functionality.
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Affiliation(s)
- Tatiana Blank
- Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, Garbsen, Germany
| | - André Marcel Ahrens
- Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, Garbsen, Germany
| | - Christian Klose
- Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, Garbsen, Germany
| | - Demircan Canadinç
- Department of Mechanical Engineering, Koç University, Sarıyer/İstanbul, Turkey
| | - Thomas Lenarz
- Department of Otorhinolaryngology, Hannover Medical School, Hannover, Germany
| | - Hans Jürgen Maier
- Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, Garbsen, Germany
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Andresen NS, Shneyderman M, Bowditch SP, Wang NY, Santina CCD, Sun DQ, Creighton FX. Cochlear Implant Revisions Over Three Decades of Experience. Otol Neurotol 2023; 44:555-562. [PMID: 37254261 PMCID: PMC10330224 DOI: 10.1097/mao.0000000000003910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
IMPORTANCE The indications, technology, and surgical technique for cochlear implantation have evolved over the last three decades. Understanding the risk of cochlear implant revision (CIR) is important for patient counseling. OBJECTIVE The objective of this study was to analyze the rates, indications, and audiologic outcomes for CIR over three decades of experience at a single academic medical center. DESIGN A retrospective chart review was performed at a single academic medical center for individuals who underwent cochlear implantation between 1985 and 2022. SETTING Single academic medical center. PARTICIPANTS Three thousand twenty-five individuals who underwent 3,934 cochlear implant operations from 1985 to 2022. EXPOSURE Cochlear implantation. MAIN OUTCOMES AND MEASURES Rates, indications, risk factors, and audiologic outcomes for CIR. RESULTS There were 276 cases of CIR after primary implantation and an overall revision rate of 7.6% (95% confidence interval, 6.8-8.5%) over 37 years of follow-up with many cases of CIR secondary to Advanced Bionics vendor B and field action failure groups. CIR rates increased sharply through the early and mid-2000s and have since remained stable. Hard or soft device failure was the most common indication for CIR, accounting for 73% of cases. Pediatric patient status and previous CIR were associated with an increased risk of CIR. Audiologic outcomes after CIR were similar to those before device failure. CONCLUSIONS AND RELEVANCE CIR remains a common procedure most often performed for device failure. Pediatric patients and those who have undergone previous CIR are at the highest risk for future CIR. Audiologic outcomes remain stable after CIR, and these data will help providers counsel patients at the risk of future CIR and understand the risk factors associated with CIR.
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Affiliation(s)
- Nicholas S. Andresen
- Department of Otolaryngology-Head and Neck Surgery and Center for Hearing and Balance, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | | | - Stephen P. Bowditch
- Department of Otolaryngology-Head and Neck Surgery and Center for Hearing and Balance, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Nae-Yuh Wang
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Departments of Biostatistics and Epidemiology, Bloomberg School of Public Health, Baltimore, MD, USA
| | - Charles C. Della Santina
- Department of Otolaryngology-Head and Neck Surgery and Center for Hearing and Balance, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Daniel Q. Sun
- Department of Otolaryngology-Head and Neck Surgery and Center for Hearing and Balance, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Francis X. Creighton
- Department of Otolaryngology-Head and Neck Surgery and Center for Hearing and Balance, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Van de Heyning P, Roland P, Lassaletta L, Agrawal S, Atlas M, Baumgartner WD, Brown K, Caversaccio M, Dazert S, Gstoettner W, Hagen R, Hagr A, Jablonski GE, Kameswaran M, Kuzovkov V, Leinung M, Li Y, Loth A, Magele A, Mlynski R, Mueller J, Parnes L, Radeloff A, Raine C, Rajan G, Schmutzhard J, Skarzynski H, Skarzynski PH, Sprinzl G, Staecker H, Stöver T, Tavora-Viera D, Topsakal V, Usami SI, Van Rompaey V, Weiss NM, Wimmer W, Zernotti M, Gavilan J. Suitable Electrode Choice for Robotic-Assisted Cochlear Implant Surgery: A Systematic Literature Review of Manual Electrode Insertion Adverse Events. Front Surg 2022; 9:823219. [PMID: 35402479 PMCID: PMC8987358 DOI: 10.3389/fsurg.2022.823219] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 02/09/2022] [Indexed: 12/05/2022] Open
Abstract
Background and Objective The cochlear implant (CI) electrode insertion process is a key step in CI surgery. One of the aims of advances in robotic-assisted CI surgery (RACIS) is to realize better cochlear structure preservation and to precisely control insertion. The aim of this literature review is to gain insight into electrode selection for RACIS by acquiring a thorough knowledge of electrode insertion and related complications from classic CI surgery involving a manual electrode insertion process. Methods A systematic electronic search of the literature was carried out using PubMed, Scopus, Cochrane, and Web of Science to find relevant literature on electrode tip fold over (ETFO), electrode scalar deviation (ESD), and electrode migration (EM) from both pre-shaped and straight electrode types. Results A total of 82 studies that include 8,603 ears implanted with a CI, i.e., pre-shaped (4,869) and straight electrodes (3,734), were evaluated. The rate of ETFO (25 studies, 2,335 ears), ESD (39 studies, 3,073 ears), and EM (18 studies, 3,195 ears) was determined. An incidence rate (±95% CI) of 5.38% (4.4–6.6%) of ETFO, 28.6% (26.6–30.6%) of ESD, and 0.53% (0.2–1.1%) of EM is associated with pre-shaped electrodes, whereas with straight electrodes it was 0.51% (0.1–1.3%), 11% (9.2–13.0%), and 3.2% (2.5–3.95%), respectively. The differences between the pre-shaped and straight electrode types are highly significant (p < 0.001). Laboratory experiments show evidence that robotic insertions of electrodes are less traumatic than manual insertions. The influence of round window (RW) vs. cochleostomy (Coch) was not assessed. Conclusion Considering the current electrode designs available and the reported incidence of insertion complications, the use of straight electrodes in RACIS and conventional CI surgery (and manual insertion) appears to be less traumatic to intracochlear structures compared with pre-shaped electrodes. However, EM of straight electrodes should be anticipated. RACIS has the potential to reduce these complications.
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Affiliation(s)
- Paul Van de Heyning
- Department of Otorhinolaryngology Head and Neck Surgery, Antwerp University Hospital, University of Antwerp, Antwerp, Belgium
- Department of Translational Neurosciences, University of Antwerp, Antwerp, Belgium
- *Correspondence: Paul Van de Heyning
| | - Peter Roland
- Department of Otolaryngology, Head & Neck Surgery, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Luis Lassaletta
- Hospital Universitario La Paz, Institute for Health Research (IdiPAZ), Madrid, Spain
| | - Sumit Agrawal
- Department of Otolaryngology-Head and Neck Surgery, Western University, London, ON, Canada
| | - Marcus Atlas
- Ear Sciences Institute Australia, Lions Hearing Clinic, Perth, WA, Australia
| | | | - Kevin Brown
- UNC Ear and Hearing Center at Chapel Hill School of Medicine, Chapel Hill, NC, United States
| | - Marco Caversaccio
- Department for ENT, Head and Neck Surgery, Bern University Hospital, Bern, Switzerland
| | - Stefan Dazert
- Department of Otorhinolaryngology-Head and Neck Surgery, Ruhr-University Bochum, St. Elisabeth University Hospital Bochum, Bochum, Germany
| | | | - Rudolf Hagen
- Würzburg ENT University Hospital, Würzburg, Germany
| | - Abdulrahman Hagr
- King Abdullah Ear Specialist Center, King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
| | - Greg Eigner Jablonski
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Department of Otorhinolaryngology & Head and Neck Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | | | - Vladislav Kuzovkov
- St. Petersburg ENT and Speech Research Institute, St. Petersburg, Russia
| | - Martin Leinung
- Department of Otolaryngology, Head and Neck Surgery, University Hospital Frankfurt, Frankfurt am Main, Germany
| | - Yongxin Li
- Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Key Laboratory of Otolaryngology Head and Neck Surgery (Capital Medical University), Ministry of Education, Beijing, China
| | - Andreas Loth
- Department of Otolaryngology, Head and Neck Surgery, University Hospital Frankfurt, Frankfurt am Main, Germany
| | - Astrid Magele
- Ear, Nose and Throat Department, University Clinic St. Poelten, Karl Landsteiner Private University, St. Poelten, Austria
| | - Robert Mlynski
- Department of Otorhinolaryngology, Head and Neck Surgery, “Otto Körner” Rostock University Medical Center, Rostock, Germany
| | - Joachim Mueller
- Klinik und Poliklinik für Hals-, Nasen- und Ohrenheilkunde, Ludwig-Maximilians-Universitat Munchen, Munchen, Germany
| | - Lorne Parnes
- Department of Otolaryngology-Head and Neck Surgery, Western University, London, ON, Canada
| | - Andreas Radeloff
- Division of Oto-Rhino-Laryngology, Evangelisches Krankenhaus Oldenburg, Research Center of Neurosensory Sciences, University Oldenburg, Oldenburg, Germany
| | - Chris Raine
- Bradford Royal Infirmary Yorkshire Auditory Implant Center, Bradford, United Kingdom
| | - Gunesh Rajan
- Department of Otolaryngology, Head and Neck Surgery, Luzerner Kantonsspital, Luzern, Medical Sciences Department of Health Sciences and Medicine. University of Lucerne, Luzern, Switzerland. Otolaryngology, Head & Neck Surgery, Medical School University of Western Australia, Perth, WA, Australia
| | - Joachim Schmutzhard
- Department of Otorhinolaryngology, Medical University of Innsbruck, Innsbruck, Austria
| | - Henryk Skarzynski
- Department of Teleaudiology and Screening, World Hearing Center of the Institute of Physiology and Pathology of Hearing, Kajetany, Poland
| | - Piotr H. Skarzynski
- Department of Teleaudiology and Screening, World Hearing Center of the Institute of Physiology and Pathology of Hearing, Kajetany, Poland
| | - Georg Sprinzl
- Ear, Nose and Throat Department, University Clinic St. Poelten, Karl Landsteiner Private University, St. Poelten, Austria
| | - Hinrich Staecker
- Kansas University Center for Hearing and Balance Disorders, Kansas City, KS, United States
| | - Timo Stöver
- Department of Otolaryngology, Head and Neck Surgery, University Hospital Frankfurt, Frankfurt am Main, Germany
| | | | - Vedat Topsakal
- Department of ENT HNS, University Hospital Brussels, Brussels, Belgium
| | - Shin-Ichi Usami
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, Nagano, Japan
| | - Vincent Van Rompaey
- Department of Otorhinolaryngology Head and Neck Surgery, Antwerp University Hospital, University of Antwerp, Antwerp, Belgium
- Department of Translational Neurosciences, University of Antwerp, Antwerp, Belgium
| | - Nora M. Weiss
- Department of Otorhinolaryngology-Head and Neck Surgery, Ruhr-University Bochum, St. Elisabeth University Hospital Bochum, Bochum, Germany
| | - Wilhelm Wimmer
- Department for ENT, Head and Neck Surgery, Bern University Hospital, Bern, Switzerland
| | - Mario Zernotti
- Catholic University of Córdoba and National University of Córdoba, Córdoba, Argentina
| | - Javier Gavilan
- Hospital Universitario La Paz, Institute for Health Research (IdiPAZ), Madrid, Spain
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