Apparatuses and methods are disclosed for efficient wireless powering of an electrical load with precise external control over pulsed voltage waveform and metering of charge delivered. The system interfaces to an inductive coil for RF power delivery from an external duty-cycled RF power transmitter, and the electrical load. The electrical load may be a photosensitive array of electrodes for an optically addressed, electrically activated retinal prosthesis. The voltage waveform to activate the load is controlled by the transmitted RF amplitude, including switching between cathodic and anodic phases of electrical stimulation. Charge delivered to the load is quantified as discharge events through a series capacitor, transmitted by backtelemetry to the receiver for continuous monitoring throughout the stimulation phases. The subject disclosure further provides for calibration of voltage amplitude and charge metering, to compensate for variable wireless link and load conditions, through additional stimulation phases with a supplementary load with known and stable characteristics.

Embodiments described herein relate to implantable medical devices (IMDs) and methods for use therewith. Such a method includes using an accelerometer of an IMD (e.g., a leadless pacemaker) to produce one or more accelerometer outputs indicative of the orientation of the IMD. The method can also include the IMD using an accelerometer to identify when the orientation of the IMD is such that the IMD will likely be able to successfully communicate with another IMD via one or more communication pulses sent from the IMD to the other IMD. The method also includes the IMD sending of the one or more communication pulses, that are used to communicate with the other IMD, when the orientation of the IMD is such that the IMD will likely be able to successfully communicate with the other IMD via one or more communication pulses sent from the IMD to the other IMD.

A device includes: a wireless power receiver configured to receive wireless power from an external device external to a body; a capacitor configured to store therein the wireless power received by the wireless power receiver; a wireless transceiver configured to transmit, to the external device, information associated with stored energy of the capacitor and scheduled energy to be used; and a processor configured to operate with the stored energy of the capacitor and process a biosignal of the body, wherein an operation of the external device and an operation of the device are synchronized, and a wireless power quantity of the wireless power to be received by the wireless power receiver from the external device is determined based on the information transmitted from the wireless transceiver to the external device.

Certain embodiments described herein related to methods, devices, and systems that provide improved communications between first and second IMDs remotely located relative to one another and capable of communicating using both conductive communication and RF communication. Such a method can include the first IMD using conductive communication to transmit message(s) intended for the second IMD, without using RF communication, during a first period of time that a first trigger event is not detected. The method can also include the first IMD detecting the first trigger event, and in response thereto, the first IMD using RF communication to transmit message(s) intended for the second IMD during a second period of time. Thereafter, in response to first IMD detecting a second trigger event, the first IMD uses conductive communication to transmit one or more messages intended for the second IMD, without using RF communication, during a third period of time.

Techniques for switching an implantable medical device (IMD) from a first mode to a second mode in relation to signals obtained from internal sensors are described. The internal sensors may include a temperature sensor and a biosensor. In some examples, processing circuitry of the IMD may make a first preliminary determination that the IMD is implanted based on a first signal from the temperature sensor. In response to the first preliminary determination being that the IMD is implanted, the processing circuitry may make a second preliminary determination that the IMD is implanted based on a second signal from the biosensor. The processing circuitry may switch the IMD from a first mode to a second mode based on both the first preliminary determination and the second preliminary determination being that the IMD is implanted.

An advertising algorithm is disclosed which operates in an Implantable Medical Device (IMD) to adjust an interval at which the IMD will transmit advertising data packets to an external device able to connect with the IMD. When a communication session between the IMD and an external device is terminated, the advertising algorithm will issue advertising data packets at a higher rate for a set duration. This will allow the external device to connect more quickly with the IMD in a next communication session. After the set duration, when it may be assumed that the external device is less likely to connect with the IMD, the algorithm reduces that rate at which advertising data packets are issued, which saves power in the IMD.

An advertising algorithm is disclosed which operates in an Implantable Medical Device (IMD) to adjust an interval at which the IMD will transmit advertising data packets to an external device able to connect with the IMD. When a communication session between the IMD and an external device is terminated, the advertising algorithm will issue advertising data packets at a higher rate for a set duration. This will allow the external device to connect more quickly with the IMD in a next communication session. After the set duration, when it may be assumed that the external device is less likely to connect with the IMD, the algorithm reduces that rate at which advertising data packets are issued, which saves power in the IMD.

An apparatus includes signal processing circuitry configured to generate processed data signals in response at least in part to transducer signals from at least one acoustic transducer and filtering signals, and to transmit the processed data signals via at least one communication channel to an actuating assembly of an auditory prosthesis. The apparatus further includes circuitry configured to monitor one or more of the signal processing circuitry, the processed data signals, and the at least one communication channel, and to generate filtering control signals in response at least in part thereto. The apparatus further includes filtering circuitry configured to generate the filtering signals in response at least in part to the processed data signals and the filtering control signals.

Techniques for facilitating improved power management for an implantable device are provided. In one example, an implantable device includes a telemetry circuit and a power management circuit. The telemetry circuit is configured to facilitate a telemetry session between the implantable device and an external device. The power management circuit is configured to connect a power supply to the telemetry circuit via a first current-limiting device based on a determination that the telemetry circuit satisfies a defined criterion. The power management circuit is also configured to connect the telemetry circuit to a second current-limiting device based on a determination that the telemetry circuit is connected to the first current-limiting device for a defined period of time.

This disclosure describes systems, devices and techniques for improving the longevity of battery life in a second device. An example first device includes communication circuitry configured to communicate with the second device and one or more sensors configured to sense parameters associated with the first device. The first device includes processing circuitry configured to determine a first time period when a likelihood of successful communications with the second device is higher than a second time period based on the sensed parameters, and control the communication circuitry to communicate with the second device during the first time period and refrain from communicating with the second device during the second time period.