A pulse generator that includes a communications module is disclosed herein. The communication module includes a transceiver and an antenna circuit. The antenna circuit includes a first pathway having a capacitor and a second, parallel pathway including a capacitor, and a resistor, and a radiating element arranged in series. The antenna circuit is tuned to have a resonant frequency corresponding to a desired transmission frequency and a bandwidth corresponding to shifts in the resonant frequency arising from the implantation of the antenna.

An implantable neurostimulator for delivering one or more stimulation pulses to a target region within a patient's body. The implantable neurostimulator including a housing and an energy storage feature. There is also a lead coupled to the hermetic housing and a plurality of electrodes located proximate to a distal end of the lead. The neurostimulator includes stimulation circuitry that includes an adjustable resistance element. A voltage of the electric signal derived from the energy storage feature and a resistance of the adjustable resistance element are both adjusted based on a measurement of a value indicative of a tissue impedance of the target region to provide a desired value of a stimulation current for the one or more stimulation pulses.

An optical sensor, especially an artificial retina, that includes at least one photosensitive cell. Each cell includes a integration capacitor, a read circuit the operation of which depends on the charge of the integration capacitor, at least one MOS transistor operating subthreshold, and the drain-source current of which influences the charge on the integration capacitor, and at least one photodiode operating in photovoltaic mode and connected to the gate of this transistor, such that the drain-source current of the MOS transistor depends on the optical power received by the photodiode.

The present disclosure provides systems and methods for circuitry for an implantable pulse generator (IPG) of a neurostimulation system. The circuitry includes at least one anode node, at least one cathode node, a plurality of switching circuits, each switching circuit coupled to the at least one anode node and the at least one cathode node, and a plurality of output channels, each output channel coupled between an associated switching circuit and at least one electrode. The circuitry further includes a first DC blocking capacitor coupled between the at least one anode node and the plurality of switching circuits, a second DC blocking capacitor coupled between the at least one cathode node and the plurality of switching circuits. The circuitry further includes mitigation circuitry operable to limit DC leakage from the plurality of switching circuits through the plurality of output channels.

The present disclosure provides an electrical stimulation device. The electrical stimulation device includes a signal receiving circuit and a signal processing circuit. The signal receiving circuit receives and outputs a frequency signal. The signal processing circuit receives the frequency signal and provides an electrical stimulation signal according to the frequency signal.

An electrical stimulation device includes a signal receiving circuit, a rectifying circuit and a signal processing circuit. The signal receiving circuit receives and outputs a frequency signal. The rectifying circuit receives the frequency signal and rectifies the frequency signal to generate a rectifying signal. The signal processing circuit receives the rectifying signal to generate an electrical stimulation signal.

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.

A charging system for an Implantable Medical Device (IMD) is disclosed having a charging coil and one or more sense coils preferably housed in a charging coil assembly coupled to an electronics module by a cable. The charging coil is preferably a wire winding, while the sense coils are preferably formed in one or more traces of a circuit board. One or more voltages induced on the one or more sense coils can be used to determine one or more parameters (magnitude, phase angle, resonant frequency) indicative of the position between the charging coil and the IMD, which position may include the radial offset and possibly also the depth of the charging coil relative to the IMD. Knowing the position, the power of the magnetic field produced by the charging coil can be adjusted to compensate for the position.

A medical apparatus configured to neuromodulate tissue and/or record patient information is provided. The apparatus includes an external system to transmit transmission signal(s), each signal having at least power or data, and an implantable system to receive the transmission signal(s). The data transfer between the external and implantable systems is asynchronous. The external system includes external antenna(s) to transmit a transmission signal. The transmission signal is an amplitude modulated signal modulated by varying a load on the external antenna(s) that causes an impedance mismatch prior to amplifying the signal for transmission. An implantable device includes implantable antenna(s) to receive the transmission signal. The implantable system comprises a receiver to receive the transmission signal from the implantable antenna(s), implantable transmission module(s) to transmit data to the external system, and a variable load connected to the implantable antenna(s). Data is transmitted by varying the load.

A system for electrical ventilation stimulation of a patient including an implantable nerve stimulator including a stimulation circuit and a pulse generator that produces biphasic charge-balanced pulses to stimulate a phrenic nerve, an external digital programming device having near field communication transmission and a digital interface, and wherein the external digital programming device is used to control settings of the implantable nerve stimulator.