Disposable manometer for use with magnetic resonance imaging

A disposable manometer for sensing and displaying pressure in a patient airway, the disposable manometer comprising:

• a) a housing having an first chamber and a second chamber separated by a movable wall, said movable wall carrying a stem coupling having an opening with an outwardly extending groove at a first end and a surface engaging a non-ferromagnetic resilient member at a distal end and within said second chamber;
• b) said first chamber being 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 first chamber, said pointer mechanism including an 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 first chamber being fluidly connected to a sensing port via a passageway and said second chamber being vented to atmosphere;
• d) whereby pressure at said sensing port is sensed in said first chamber causing said movable wall to move against force of said non-ferromagnetic resilient member, said pointer thereby rotating into alignment with an indicia representative of pressure in said first chamber.

A disposable manometer for sensing and displaying air pressure, the disposable manometer comprising:

• a) a housing having an first chamber and a second chamber separated by a movable wall, said movable wall carrying a stem coupling having an opening with an outwardly extending groove at a first end and a surface engaging a non-ferromagnetic resilient member at a distal end and within said second chamber;
• b) said first 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 first chamber, said pointer mechanism including an 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 first chamber being fluidly connected to a source of air from source of respiratory gasses via a passageway and said second chamber being vented to atmosphere;
• d) whereby pressure at a sensing port is sensed in said first chamber causing said movable wall to move against force of said non-ferromagnetic resilient member, said pointer thereby rotating into alignment with an indicia representative of pressure in said first chamber.