Patient interface and a positioning and stabilising structure

A patient interface comprising:

• a plenum chamber pressurisable to a therapeutic pressure of at least 6 cmH2O above ambient air pressure;
• at least three plenum chamber inlet ports sized and structured to receive respective flows of air at the therapeutic pressure for breathing by a patient;
• a seal-forming structure constructed and arranged to form a seal with a region of the patient's face surrounding an entrance to the patient's airways, said seal-forming structure having a hole therein such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the plenum chamber throughout the patient's respiratory cycle in use;
• and
• a positioning and stabilising structure comprising at least four straps, at least three of said straps defining a channel therein, wherein a conduit is provided within each channel, each conduit comprising an interface connector for connecting the conduit, in use, to a respective one of the inlet ports, wherein each conduit is decoupled from the respective strap such that, in use, the conduits do not contribute to an interfacing vector,
• the positioning and stabilising structure further comprising a connection port for connection, in use, to an air circuit, wherein the connection port is in fluid communication with each of the conduits,
• wherein the plenum chamber is provided with at least one pressure measurement port.