Disposable manometer for use with a CPR bag

In combination with a breathing tube including a mouthpiece, a passage, an outlet and a sensing port fluidly connected to said passage, a manometer for sensing and displaying pressure in said passage comprising:

• a) a housing having an upper chamber and a lower chamber separated by a movable wall, said movable wall carrying a stem coupling having an opening with an outwardly extending groove and a bottom surface engaging a compression spring within said lower chamber;
• b) said upper chamber being upwardly closed by a cap having pressure indicating indicia thereon, and said cap having a pointer mechanism rotatably mounted thereon and including a pointer alignable with said indicia to indicate pressure in said upper chamber, said pointer mechanism including a downwardly depending actuator stem having a spiral-shaped projection thereon, said actuator stem inserted into said stem coupling opening with said spiral-shaped projection engaged within said groove, whereby reciprocations of said stem coupling translate to rotations of said pointer;
• c) said upper chamber being fluidly connected to said sensing port via a restricted passageway and said lower chamber being vented to atmosphere;
• d) whereby pressure at said sensing port is sensed in said upper chamber causing said movable wall to move downwardly against force of said spring, said pointer thereby rotating into alignment with an indicium representative of pressure in said upper chamber.

A manometer for sensing and displaying air pressure in combination with a CPR bag or a patient breathing tube, the manometer comprising

• a) a housing having an upper chamber and a lower chamber separated by a movable wall, said movable wall carrying a stem coupling having an opening with an outwardly extending groove and a bottom surface engaging a compression spring within said lower chamber;
• b) said upper chamber being upwardly closed by a cap having pressure indicating indicia thereon, and said cap having a pointer mechanism rotatably mounted thereon and including a pointer alignable with said indicia to indicate pressure in said upper chamber, said pointer mechanism including a downwardly depending actuator stem having a spiral-shaped projection thereon, said actuator stem inserted into said stem coupling opening with said spiral-shaped projection engaged within said groove, whereby reciprocations of said stem coupling translate to rotations of said pointer;
• c) said upper chamber being fluidly connected to a source of air from the CPR bag or patient breathing tube via a restricted passageway and said lower chamber being vented to atmosphere;
• d) whereby pressure at a sensing port is sensed in said upper chamber causing said movable wall to move downwardly against force of said spring, said pointer thereby rotating into alignment with an indicium representative of pressure in said upper chamber.