Abstract: A method and device for measuring an evoked neural response comprising a sensor (25) for obtaining a sensed signal representing the evoked neural response, a high gain amplifier (30) having a signal input (31) for receiving the sensed signal and having a reference input (32), and means for altering or setting a reference voltage at the reference input (32) to prevent the amplifier (30) saturating with variations of the sensed signal.

Abstract: There is described an electrical tissue stimulating device, such as a cochlear prosthesis, which includes circuitry (47) for monitoring the build-up of undesirable residual voltages between stimulation electrodes. In the event that such a condition is sensed then an overvoltage signal is generated and transmitted to a switch controller (48). In response the switch controller controls electrode switches (42) in order to suppress stimulation of the monitored electrode(s) until the undesirable residual voltage has fallen to an acceptable level. As a result the build-up of undesirable inter-electrode voltages is reduced.

Abstract: Disclosed is an arrangement allowing for automatic calculation of stimulation parameters, for example dynamic ranges for stimulation, in an auditory prosthesis, for example a multichannel cochlear implant. The arrangement includes, in a preferred form, an electrode 12 for detecting activity of the stapedius muscle, and uses the electrode array 5 to sense neural response to stimulation, so that a maximum comfortable stimulation level and threshold level for each channel can be determined. The process may be initiated by the implantee, avoiding the requirement for external equipment and extensive audiological testing.

Abstract: A packaging system for a bioelectrical stimulating and recording electrode is provided. The system includes a semi-porous protective container in which the electrode is housed. A conductive biocompatible and bioresorbable liquid partially fills the container in order for the electrode housed therein to be coated by the liquid. While the preferred conductive liquid is glycerol, other liquids may be chosen for practicing the invention.

Abstract: A system is disclosed for enabling telemetry from an auditory prosthesis, illustratively a cochlear prosthesis. An electrode array 10 is used both for delivering electrical stimuli, and for sensing evoked potentials. Preferably a delay is provided between stimulus and measurement, and the sensing electrodes are distinct from the stimulus electrodes.

Abstract: An implanted device such as a cochlear implant system includes a housing containing stimulating pulse generating circuitry, and a plurality of electrodes external of the housing and receiving the pulses. Between the pulses, parasitic voltages may build up between the electrodes. In order to control the inrush current due to these parasitic voltages, multi-position switches are provided which selectively couple the electrodes to resistors selected to dissipate the voltages at a preselected maximum current to protect the body organs.