Techniques for facilitating telemetry between a medical device and an external device are provided. In one example, a medical device includes a classification component and a communication component. The classification component is configured to determine a classification for data generated by the medical device. The classification component is also configured to determine an urgency level for an advertising data packet based on the classification for the data. The communication component is also configured to broadcast the advertising data packet for the medical device at a defined beaconing rate based on the urgency level for the advertising data packet.

A neuromodulation system includes a medical device; a first computing device; a second computing device; and a third computing device. The system is configured to control communications by: permitting only unidirectional communication between the first computing device and the second computing device while: preventing communication between the first computing device and the third computing device, and preventing communication between the second computing device and the third computing device; permitting only unidirectional communication between the first computing device and the third computing device while: preventing communication between the first computing device and the second computing device, and preventing communication between the second computing device and the third computing device; or permitting only unidirectional communication between the second computing device and the third computing device while: preventing communication between the first computing device and the second computing device, and preventing communication between the first computing device and the third computing device.

A charger including a class E power driver, a frequency-shift keying (“FSK”) module, and a processor. The processor can receive data relating to the operation of the class E power driver and can control the class E power driver based on the received data relating to the operation of the class E power driver. The processor can additionally control the FSK module to modulate the natural frequency of the class E power transformer to thereby allow the simultaneous recharging of an implantable device and the transmission of data to the implantable device. The processor can additionally compensate for propagation delays by adjusting switching times.

A system includes a controller module, which includes a storage device, a controller, a modulator, and one or more antennas. The storage device is stored with parameters defining a stimulation waveform. The controller is configured to generate, based on the stored parameters, an output signal that includes the stimulation waveform, wherein the output signal additionally includes polarity assignments for electrodes in an implantable, passive stimulation device. The modulator modulates a stimulus carrier signal with the output signal to generate a transmission signal. The one or more antennas transmit the transmission signal to the implantable, passive stimulation device such that the implantable, passive stimulation device uses energy in the transmission signal for operation, sets the polarities for the electrodes in the implantable, passive stimulation device based on the encoded polarity assignments, generates electrical pulses using the stimulation waveform, and applies the electrical pulses to excitable tissue.

A system includes electronic circuitry that receives a self-clocking differential signal comprising a data signal encoded with a clock signal at a dock frequency. The electronic circuitry is configured to recover, from the self-docking differential signal, the data signal and the dock signal. Then, based on the recovered dock signal, the electronic circuitry is configured to wirelessly transmit, to an implantable stimulator implanted within a recipient, a forward telemetry signal representing data recovered from the data signal. Corresponding systems, methods, devices, and application specific integrated circuits (ASICs) are also disclosed.

An invention and method that generate dynamical shaped voltage-gradient geometries through a plurality of dual-modal electrode-contacts placed around the biological tissue in vivo. The geometry of the voltage gradient is optimized through a feedback mechanism from the plurality of dual-modal electrode-contacts that can record electric and magnetic field potentials in the biological tissue. A control controls the waveform signal between sets of electrode-contacts to generate dynamically shaped voltage gradients to modulate a specific set of properties in the biological tissue. A method of analysis for the recorded electric and magnetic field potentials is purposed to optimize the shape of the voltage-gradient geometry through modulation of the waveform signal that is sent through the dual-modal electrode-contacts.

An implantable device for delivering closed-loop neural stimulation therapy. The device comprises: a plurality of electrodes; a stimulus source to provide neural stimuli via the electrodes to a neural pathway; measurement circuitry to process signals sensed at the electrodes; and a control unit. The control unit is configured to: control the stimulus source to provide a first neural stimulus according to a first stimulus parameter; measure an intensity of a neural response evoked by the first stimulus; compute a feedback variable from the neural response; adjust the first stimulus parameter; repeat the control, measure, compute and adjust to maintain the feedback variable at a target response intensity; control the stimulus source to provide, interleaved with the first neural stimuli, a plurality of second neural stimuli according to respective second stimulus parameters; and monitor the therapy by analysing the sensed signals subsequent to each second neural stimulus.

An implantable micro device, or dust, has a piezoelectric transducer connected to a power management circuit, which provides electric power output for powering components of the device based on an ultrasonic power signal from an external ultrasonic signal source. A sensor measures a physical parameter, e.g. a neural activity signal, and generates an electric signal, digitized by a time-encoding analog-to-digital converter, e.g. a delta-sigma modulator, to generate a one-bit data stream representing the sensed parameter. A load modulation circuit with one or more electric switches connected to the transducer modulates transducer electric load according to the one-bit data stream, thus causing a backscattered signal from the piezoelectric transducer to be modulated by the sensed physical parameter. Preferably, the piezoelectric transducer's electric load is harshly modulated by connecting it to either an optimum load for minimum reflection, or short-circuiting for maximum reflection according to each bit of the digitized data stream.

Obesity and other medical conditions can be managed using a closed-loop system, which uses one or more implantable recording electrodes, a processing device, and one or more implantable stimulating electrodes. The one or more implantable recording electrodes can record signals from a portion of one or more subdiaphragmatic branches of a patient’s vagus nerve. The processing device can be configured to: receive the signals from the portion of the one or more subdiaphragmatic branches of the patient’s vagus nerve, perform signal processing to decode the signals from the portion of the one or more subdiaphragmatic branches of the patient’s vagus nerve, and configure a stimulation to decrease the patient’s hunger and/or increase the patient’s satiety based on the decoded signals. The one or more implantable stimulating electrodes can deliver the configured stimulation to another portion of one or more subdiaphragmatic branches of the patient’s vagus nerve.

A neuromodulation therapy is delivered via at least one electrode implanted subcutaneously and superficially to a fascia layer superficial to a nerve of a patient. In one example, an implantable medical device is deployed along a superficial surface of a deep fascia tissue layer superficial to a nerve of a patient. Electrical stimulation energy is delivered to the nerve through the deep fascia tissue layer via implantable medical device electrodes.