Following the introduction of e2e Wireless 3.0 technology by Sivantos in 2014, considerable advances in hearing aid binaural beam-forming technology have been achieved. Sizable technological leaps in CROS and BiCROS fittings have been made since the early inception of the method in the 1960s, when connectivity between bilaterally worn devices was only possible using wire-based electrical contacts. For SSD patients who also have a hearing loss in their better ear, BiCROS systems provide amplification for sound arriving at the microphone of the better ear instrument, enabling compensation for the additional hearing loss on the patient’s “good” side. In a CROS fitting, there is typically no direct amplification of sound entering the instrument worn on the better ear. The users are then able to perceive sound originating from their poor-ear-side in the good ear, thus overcoming the head-shadow effect. The CROS consists of a bilateral hearing instrument fitting in which sound detected from the device worn on the poor ear is transmitted to the device worn on the better ear. Speech understanding in noise is significantly worsened and sound localization ability also is significantly impaired.Įffective non-surgical solutions for problems associated with SSD are CROS (Contralateral Routing of Signals) and BiCROS (Bilateral CROS) systems. In addition to reduced sensitivity to sound on the side of the bad ear, the loss of binaural acoustic information results in further deficits. This effect is more pronounced at the higher frequencies important for speech understanding, making communication with talkers facing the patient’s worse ear especially difficult. This occurs due to the “head-shadow effect,” where the level of sound originating on the side of the bad ear is attenuated as it travels around the head to the better hearing ear. One prominent difficulty is the reduced audibility of sound originating from the side of the patient’s worse ear. People with SSD experience a unique array of auditory challenges. Overall, the findings of this study demonstrate that the two new CROS/BiCROS systems from Signia-the Pure 312 Nx CROS with Narrow directionality and the Silk Nx CROS-provide a superior solution to the daily listening problems encountered by people with single-sided deafness (SSD). While many patients with SSD have normal to near-normal contralateral hearing ability, the condition frequently occurs with hearing loss also present in the better ear. Single-sided deafness (SSD) is characterized by a substantial loss of functional hearing ability in one ear, to the extent that amplification provides little or no benefit on that side. Tech Topic | December 2018 Hearing Reviewīy Veronika Littmann, PhD, and Alastair Manders, PhD
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