Abstract: Described herein are systems, devices, and methods for energy-efficient operation of wireless devices. In some variations, a wireless monitor may comprise a sensor configured to measure a physiological parameter of a patient at a first resolution. A processor may be configured to generate physiological parameter data based on the measured physiological parameter of the patient at the first resolution. The sensor may be configured to measure the physiological parameter of the patient at a second resolution based at least in part on the physiological parameter data.

Abstract: A hybrid RF-acoustic relay is provided where some but not all of the incident RF power is rectified to power the relay and, optionally, to provide power for further link features. The remaining fraction of the incident RF power is used to directly drive an acoustic transceiver array in communication with one or more acoustically powered nodes. In this manner, power, control and communication can be efficiently provided to acoustically powered nodes even in situations where an RF link or an acoustic link would perform poorly.

Abstract: Described here are wireless monitoring devices, systems, and methods for estimating one or more physiological parameters of a patient. These devices and systems may measure or receive a signal waveform transmitted through one or more of fluid and a physiological structure of a patient. This measured signal waveform may be processed to generate waveform parameter data used to estimate a physiological parameter such as blood velocity, heart wall thickness, and the like.

Abstract: Described here are systems, devices, and methods for establishing a wireless link such as for exchanging wireless power, data, or signals through tissue. In some variations, a system may comprise a first device configured to generate a wireless signal. A second device may comprise a processor and one or more transducer arrays configured to receive the wireless signal from the first device. The processor may be configured to generate first device data based on the received wireless signal. The second transducer array may be configured to exchange one or more wireless signals with the first device based on the first device data.

Abstract: A hybrid RF-acoustic relay is provided where some but not all of the incident RF power is rectified to power the relay and, optionally, to provide power for further link features. The remaining fraction of the incident RF power is used to directly drive an acoustic transceiver array in communication with one or more acoustically powered nodes. In this manner, power, control and communication can be efficiently provided to acoustically powered nodes even in situations where an RF link or an acoustic link would perform poorly.

Abstract: Efficient power transmission from an acoustic transmitter to an electrical load on an implanted device is provided using a control system that at least varies the transmitted acoustic frequency. Varying the transmitted frequency can change the electrical impedance of the acoustic transducer in the receiver that receives power from the transmitter. This ability to vary the transducer impedance can be used to optimize power delivery to the load.

Abstract: A wireless powering and communication system is provided that includes a base unit, and an external unit that is separate from the base unit, where the base unit includes a single transducer circuit configured for uplink data communication to the external unit, where the transducer circuit is configured for power recovery from the external unit, a multiplexer circuit, a power recovery and conditioning circuit, a controller circuit, and a communication circuit, where the multiplexer circuit is configured to decouple power and data paths to enable operation with the single transducer circuit, the power recovery and conditioning circuit is configured to recover and optionally store power from power received by the single transducer circuit, the power recovery and conditioning circuit is configured to power the controller circuit and the communication circuit, the controller circuit is configured to control the multiplexer circuit, the communication circuit is configured to provide data to the multiplexer circuit

Abstract: A wireless powering and communication system is provided that includes a base unit, and an external unit that is separate from the base unit, where the base unit includes a single transducer circuit configured for uplink data communication to the external unit, where the transducer circuit is configured for power recovery from the external unit, a multiplexer circuit, a power recovery and conditioning circuit, a controller circuit, and a communication circuit, where the multiplexer circuit is configured to decouple power and data paths to enable operation with the single transducer circuit, the power recovery and conditioning circuit is configured to recover and optionally store power from power received by the single transducer circuit, the power recovery and conditioning circuit is configured to power the controller circuit and the communication circuit, the controller circuit is configured to control the multiplexer circuit, the communication circuit is configured to provide data to the multiplexer circuit

Abstract: Efficient power transmission from an acoustic transmitter to an electrical load on an implanted device is provided using a control system that at least varies the transmitted acoustic frequency. Varying the transmitted frequency can change the electrical impedance of the acoustic transducer in the receiver that receives power from the transmitter. This ability to vary the transducer impedance can be used to optimize power delivery to the load.

Abstract: Aspects of the present disclosure are directed toward apparatuses, systems, and methods that include a base unit and a communication circuit that communicate, while implanted in a patient, signals between the patient and at least one device located external to the patient. The base unit also includes a transducer that communicates ultrasound (US) signals between the base unit and the at least one device located external to the patient, and harvests energy carried by the US signals.

Abstract: An analyte monitoring device is provided that includes a microfluidic channel, where the microfluidic channel is configured for holding a sample under test, an electromagnetic excitation source disposed on a first side of the microfluidic channel, an ultrasonic transducer disposed on a second side of the microfluidic channel, or disposed on the first side of the microfluidic channel, and an appropriately programmed computer, where the electromagnetic excitation source is disposed to induce an thermoacoustic response in the microfluidic channel when holding the sample under test, where the ultrasonic transducer is disposed to receive the thermoacoustic response, where the ultrasonic transducer outputs a voltage to the appropriately programmed computer, where the appropriately programmed computer outputs an analyte value according to the thermoacoustic response.

Abstract: Aspects of the present disclosure are directed toward apparatuses, systems, and methods that include a base unit and a communication circuit that communicate, while implanted in a patient, signals between the patient and at least one device located external to the patient. The base unit also includes a transducer that communicates ultrasound (US) signals between the base unit and the at least one device located external to the patient, and harvests energy carried by the US signals.