Barbara M, Manni V, Monini S. Totally implantable middle ear device for rehabilitation of sensorineural hearing loss: preliminary experience with the ESTEEM, Envoy. Acta Oto-Laryngologica [serial online]. April 2009;129(4):429-432. Available from: CINAHL with Full Text, Ipswich, MA. Accessed July 9, 2010.

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This article goes through the 6 subjects that have received the envoy esteem device. The surgical implantation itself takes a long time, but the results are effective. In 3 subjects a change was seen in their hearing once the device was activated. This device is for moderate to severe sensorineurnal hearing loss and subjects were selected for the trial.