Patent ID: 8607794

Claim:
A nasal continuous positive airway pressure device for use in a CPAP system to assist patient breathing, the device comprising: a generator body forming: an inlet for fluid connection to a source of pressurized gas, a chamber fluidly connected to the inlet, first and second flow circuits fluidly connected to the chamber, each of the flow circuits including: a nozzle defining an inlet end and an outlet end, the inlet end fluidly connected to the chamber and the outlet end having a diameter less than a diameter of the inlet end, a channel defining: a nozzle side fluidly connected to the outlet end of the nozzle, a patient side opposite the nozzle side for directing gas to and from a patient's naris, a first ramp region between the nozzle and patient sides, the first ramp region tapering in diameter toward the patient side, a second ramp region between the first ramp region and the patient side, the second ramp region expanding in diameter toward the patient side, and an open port fluidly connected to the channel at a location between the nozzle side and the patient side, the open port angularly aligned above the first ramp region, wherein the nozzle is configured to create a jet stream from pressurized gas in the chamber, the jet stream being deliverable to the channel and divertible to the open port, and a patient interface piece fluidly connected to the patient side of the channels.