Patent ID: 7617826

Claim:
A conserver which receives a fluid from a source of pressurized fluid and provides fluid to a patient through a single lumen cannula, the conserver comprising: a body including at least three body members stacked along a first direction, the body having a fluid input in a first body member, a fluid output in a side of a second body member providing a single fluid connection between the body and the single lumen cannula, wherein the single fluid connection is the only fluid connection between the body and the single lumen cannula, and a fluid passage configured to connect the fluid input to the fluid output; a pressure reduction section disposed within the first body member of the body and in fluid communication with the fluid passage, the pressure reduction section receiving fluid from the fluid inlet of the body at a first pressure and providing fluid to a portion of the fluid passage positioned downstream of the pressure reduction section; at least one user input supported by the body; a pneumatic controller positioned downstream of the pressure reduction section in at least one of the at least three body members other than the first body member, the pneumatic controller having a first configuration to provide a continuous flow of fluid to the fluid outlet of the body in a continuous mode and a second configuration to provide an intermittent flow of fluid to the fluid outlet of the body in an intermittent mode, the intermittent mode and the continuous mode being selectable by the at least one user input, the pneumatic controller includes a sense diaphragm which in the intermittent mode moves along the first direction relative to a diaphragm seat between a closed position and an open position to control the provision of fluid to the single lumen cannula; and a coupler coupled to the first body member of the body, the coupler having a fluid conduit in fluid communication with the fluid inlet of the body, the coupler being adapted to couple to a source of pressurized fluid, wherein the coupler is made from a first material selected from the group of a brass based material, a copper based material, and a titanium based material and the body is made from a second material selected from the group of an aluminum based material, a composite based material, and a polymeric based material.