Abstract: The present invention relates to a stimulation generator suitable for use in an implantable neurostimulator, including an injectable neurostimulator. The stimulation generator is adapted to provide a configurable stimulation signal comprising a component, such as a pulse. The stimulation generator comprises circuitry to receive and combine an amplitude control signal and a duty cycle signal to produce a preliminary output voltage signal which includes the component of the stimulation signal. It further comprises a voltage-controlled current source adapted to be driven by the preliminary output voltage signal; and a mode selector controlled by a stimulation mode signal to output the component from the preliminary output voltage signal as a current-controlled component of the stimulation signal via the voltage-controlled current source or as a voltage-controlled component of the stimulation signal.

Abstract: A removable gas sensor module is provided for a therapeutic gas delivery device. The gas sensor module includes a sample chamber which receives a sample gas from the therapeutic gas delivery device. A gas detection unit includes a plurality of sensors operable to measure at least one property of the sample gas. The sensors include two or more of a gas detection sensor, a humidity sensor, a temperature sensor, or a combination thereof. The gas sensor module is self-contained within the therapeutic gas delivery device and swappable with another gas sensor module.