Abstract: This method of determining an intracochlea tissue impedance comprises using at least two stimulating electrodes to apply an electrical stimulus to intracochlea tissue. A voltage caused by the stimulus is measured between two measuring electrodes distinct from the stimulating electrodes. From the voltage a stimulus-response characteristic of tissue between the two measuring electrodes is determined. This allows the tissue/electrode interface impedance and potential and the tissue impedance and potential to be uniquely determined. In turn, modiolus currents can be estimated in monopolar stimulation mode. Also provided is automated initiation of re-mapping of the device when tissue characteristics change.

Abstract: Presented herein is diagnostic and adaptive circuitry for use in an implantable medical system (prosthesis) having at least two physically separate implantable modules (packages) that are electrically connected by a lead assembly (cable). The diagnostic and adaptive circuitry is configured to execute testing and adaptive (corrective) functions.

Abstract: This method of determining an intracochlea tissue impedance comprises using at least two stimulating electrodes to apply an electrical stimulus to intracochlea tissue. A voltage caused by the stimulus is measured between two measuring electrodes distinct from the stimulating electrodes. From the voltage a stimulus-response characteristic of tissue between the two measuring electrodes is determined This allows the tissue/electrode interface impedance and potential and the tissue impedance and potential to be uniquely determined. In turn, modiolus currents can be estimated in monopolar stimulation mode.

Abstract: Presented herein is diagnostic and adaptive circuitry for use in an implantable medical system (prosthesis) having at least two physically separate implantable modules (packages) that are electrically connected by a lead assembly (cable). The diagnostic and adaptive circuitry is configured to execute testing and adaptive (corrective) functions.

Abstract: This method of determining an intracochlea tissue impedance comprises using at least two stimulating electrodes to apply an electrical stimulus to intracochlea tissue. A voltage caused by the stimulus is measured between two measuring electrodes distinct from the stimulating electrodes. From the voltage a stimulus-response characteristic of tissue between the two measuring electrodes is determined. This allows the tissue/electrode interface impedance and potential and the tissue impedance and potential to be uniquely determined. In turn, modiolus currents can be estimated in monopolar stimulation mode. Also provided is automated initiation of re-mapping of the device when tissue characteristics change.

Abstract: A method and device for measuring and controlling stimulation current, for example in an implantable device, are disclosed. A series capacitor (Cb) is disposed along the conduction path, and the voltage (Uc) across the capacitor measured, so as to provide a direct measurement of the delivered stimulation current.

Abstract: An implantable stimulation device is disclosed which provides for reduced power consumption when compared with bipolar stimulation and better stimulation performance when compared with monopolar stimulation. Implantable stimulator devices use less power in monopolar stimulation mode than that of bipolar stimulation but stimulation performance is greater when using bipolar stimulation. The device comprises circuitry capable of simultaneous stimulation between a reference electrode and an electrode of a stimulation array and between electrodes of the stimulation array, the ratio of current to the reference electrode and array electrodes being selectable.

Abstract: Medical device implants for stimulating the nervous system of a recipient are disclosed. Embodiments include a cochlear implant with electrodes for delivering charge to the cochlea of the recipient and stimulation circuitry for delivering the charge to the electrodes. The medical devices include a transfer line which carries power and/or communication signals, the transfer line being in contact with tissue of the recipient when the medical device implant is implanted. A leakage capture conductor and/or sensing electrode is located or locatable proximate the insulated conductor.

Abstract: Manufacturing an electrode assembly comprising forming an intermediate assembly comprising a carrier member having one or more electrode contacts embedded therein, the surface of the electrode contacts having a layer of carrier member material thereon; removing the layer of carrier member from the surface of the one or more electrode contacts, wherein a residual amount of the carrier member material remains on the surface of at least one of the electrode contacts; and substantially removing the residual carrier member material from the surface of the at least one electrode contact so as to increase the effective surface area of the at least one electrode contact.

Abstract: Medical device implants for stimulating the nervous system of a recipient are disclosed. Embodiments include a cochlear implant with electrodes for delivering charge to the cochlea of the recipient and stimulation circuitry for delivering the charge to the electrodes. The medical devices include a transfer line which carries power and/or communication signals, the transfer line being in contact with tissue of the recipient when the medical device implant is implanted. A leakage capture conductor and/or sensing electrode is located or locatable proximate the insulated conductor.

Abstract: An implantable stimulation device is disclosed which provides for reduced power consumption when compared with bipolar stimulation and better stimulation performance when compared with monopolar stimulation. Implantable stimulator devices use less power in monopolar stimulation mode than that of bipolar stimulation but stimulation performance is greater when using bipolar stimulation. The device comprises circuitry capable of simultaneous stimulation between a reference electrode and an electrode of a stimulation array and between electrodes of the stimulation array, the ratio of current to the reference electrode and array electrodes being selectable.

Abstract: A method and device for measuring and controlling stimulation current, for example in an implantable device, are disclosed. A series capacitor (Cb) is disposed along the conduction path, and the voltage (Uc) across the capacitor measured, so as to provide a direct measurement of the delivered stimulation current.