Reliable determination of cochlear implant electrode positions shows promise for clinical applications, including anatomy-based fitting audio processors or monitoring migration during follow-up. Currently, positioning is measured using radiography. The primary objective this study to extend and validate an impedance-based method estimating insertion depths, which could serve as a radiation-free cost-effective alternative secondary evaluate the reliability estimation in postoperative...

Objectives: Real-time electrocochleography (ECochG) has been used as a monitoring tool during cochlear implantation (CI), whereby, amplitude drops have correlated with postoperative acoustic hearing results. However, no consensus reached to how single event of an drop should be characterized. The aim this study was identify ECochG events that predict loss 1 month after surgery. Design: Fifty-five patients were included in prospective cohort study. measurements performed CI electrode...

<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Objective:</i> The insertion of the electrode array is a critical step in cochlear implantation. Herein we comprehensively investigate impact alignment angle and feed-forward speed on deep insertions artificial scala tympani models with accurate macro-anatomy controlled frictional properties. xmlns:xlink="http://www.w3.org/1999/xlink">Methods:</i> Motorized (n=1033) were performed six varying...

Objective Cochlear implants (CIs) are standard treatment for postlingually deafened individuals and prelingually children. This human cadaver study evaluated diagnostic usefulness, image quality artifacts in 1.5T 3T magnetic resonance (MR) brain scans after CI with a removable magnet. Methods Three criteria (diagnostic quality, artifacts) were assessed at five heads CI. The performed without the magnet situ. analyzed by two blinded neuroradiologists, focus on distortion limitation of value...

Objective: To evaluate the speech intelligibility in noise with a new cochlear implant (CI) processor that uses pinna effect imitating directional microphone system. Study Design: Prospective experimental study. Setting: Tertiary referral center. Patients: Ten experienced, unilateral CI recipients bilateral severe-to-profound hearing loss. Intervention: All participants performed tests Opus 2 (omnidirectional mode only) and newer Sonnet mode). Main Outcome Measure: The reception threshold...

Spikes in cochlear implant impedance are associated with inner ear pathology after implantation. Here, we correlate these spikes episodes of hearing loss and/or vertigo, a comparison between lateral wall and peri-modiolar electrode arrays.Seven hundred seventy recipients Cochlear's slim-straight, (CI422), or (CI512) were investigated for spikes. Impedance fluctuations defined as median rise ≥ 4 kΩ across all intracochlear electrodes from baseline measurements taken 2 weeks switch-on. Medical...

Objective: To describe the tip fold over rate, scalar localization, and speech perception outcomes of CI532 Slim Modiolar Electrode. Patients Intervention: All patients receiving implant before June 2018. Main Outcome Measures: measures for adults include pre- postoperative perception, operative report details, electrode position as determined by X-ray cone beam computed tomography. Comparison made with previous experience Contour perimodiolar (CI512). In pediatric population fold-over...

Real-time electrocochleography (rt-ECochG) is a method to detect intracochlear potential changes during cochlear implantation (CI). Steep amplitude drops of the microphonic (CM) signal (so called "ECochG events") have been correlated with worse residual hearing outcomes. However, sensitivity and specificity monitoring CM on its own are too low use it as biomarker. The aim this article was establish if additional components would help better predict postoperative outcomes.Single-center,...

Objectives The aim of this study is to improve our understanding the mechanics involved in insertion lateral wall cochlear implant electrode arrays. Design A series 30 experiments were conducted by three experienced surgeons. carried out a previously validated artificial temporal bone model according established soft surgery guidelines. use an vitro setup enabled us comprehensively evaluate relevant parameters, such as force, intracochlear pressure, and exact array position controlled...

Objectives: Cochlear implant (CI) candidates increasingly exhibit some degree of residual hearing, which should be preserved despite the implantation. Today, cochlear health is monitored during CI surgery by tracking microphonic (CM) amplitude from intracochlear electrocochleography (ECochG) measurements. However, recent studies indicate that insertion depth measuring electrode must considered to accurately interpret these signals. The acoustic path base apex induces excitation delays in...

Electrocochleography (ECochG) is increasingly used to monitor the inner ear function of cochlear implant (CI) patients during surgery. Current ECochG-based trauma detection shows low sensitivity and specificity depends on visual analysis by experts. Trauma could be improved including electric impedance data recorded simultaneously with ECochG. However, combined recordings are rarely because measurements produce artifacts in In this study, we propose a framework for automated real-time...

Accurate spatial registration of probes (e.g., optodes and electrodes) for measurement brain activity is a crucial aspect in many neuroimaging modalities. It may increase precision enable the transition from channel-based calculations to volumetric representations.

Sound intensity is a key feature of auditory signals. A profound understanding cortical processing this therefore highly desirable. This study investigates whether functional near-infrared spectroscopy (fNIRS) signals reflect sound changes and where on the brain cortex maximal intensity-dependent activations are located. The fNIRS technique particularly suitable for kind hearing study, as it runs silently. Twenty-three normal subjects were included actively participated in counterbalanced...

For medical or financial reasons, bilateral cochlear implantation is not always possible in bilaterally deafened patients. In such cases, a contralateral routing of signals (CROS) device could complement the monaural implant. The goal our study was to compare benefit three different conditions: (1) unilateral implant (CI) alone, (2) CI complemented with directional CROS microphone, and (3) CIs.Twelve experienced users were tested. Speech reception noise sound localization measured...

Objectives: Functional near-infrared spectroscopy (fNIRS) is a brain imaging technique particularly suitable for hearing studies. However, the nature of fNIRS responses to auditory stimuli presented at different stimulus intensities not well understood. In this study, we investigated whether response amplitude was better predicted by properties (intensity) or individually perceived attributes (loudness). Design: Twenty-two young adults were included in experimental study. Four broadband...

Introduction and Objectives Among cochlear implant candidates, an increasing number of patients are presenting with residual acoustic hearing. To monitor the postoperative course structural functional preservation cochlea, a reliable objective biomarker would be desirable. Recently, impedance telemetry has gained attention in this field. The aim study was to investigate hearing clinical long electrode arrays explore applicability for monitoring Methods We retrospectively analyzed records 42...

Abstract Electrocochleography (ECochG) measures electrophysiological inner ear potentials in response to acoustic stimulation. These reflect the state of and provide important information about its residual function. For cochlear implant (CI) recipients, we can measure ECochG signals directly within cochlea using electrode. We are able perform these recordings during at any point after implantation. However, analysis interpretation not trivial. To assist scientific community, our...

Descriptive statistics with respect to patient anatomy and image guidance accuracy can be used assess the effectiveness of any system for minimally invasive cochlear implantation, on both an individual wider population level.Minimally implantation involves drilling a tunnel from surface mastoid cochlea, trajectory passing through facial recess. The recess constrains path places prohibitive requirements system. Existing single thresholds are insufficient assessing these systems.A statistical...

Hypothesis: The aim of this study was to present and validate the accuracy a method predict required cochlear implant (CI) electrode array length for specific angular insertion depth (AID). Background: human cochlea exhibits remarkable interindividual morphological differences. prediction AID can help improve outcome surgery. Methods: We estimated linear an 540 degrees using computed tomography images 16 temporal bone specimens (eight Thiel fixed, eight formalin fixed). Free fitting arrays...

<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Objective:</i> Limitations in human kinematics during cochlear implantation induce pressure transients and increased forces on intracochlear structures. Herein, we present a novel head-mounted surgical tool designed for the motorized insertion of implant electrode arrays. The integrates force measurement feature to overcome lack haptic feedback current robotic solutions....

Electrocochleography (ECochG) is increasingly recognized as a biomarker for assessing inner ear function in cochlear implant patients. This study aimed to objectively determine intraoperative microphonic (CM) amplitude patterns and correlate them with residual hearing recipients, addressing the limitations current ECochG analysis that often depends on subjective visual assessment overlook intracochlear measurement location.

Introduction and objectives Maintaining the structural integrity of cochlea preserving residual hearing is crucial for patients, especially those whom electric acoustic stimulation intended. Impedances could reflect trauma due to electrode array insertion therefore serve as a biomarker hearing. The aim this study evaluate association between estimated impedance subcomponents in known collective from an exploratory study. Methods A total 42 patients with lateral wall arrays same manufacturer...