Patent ID: 8522618

Claim:
A disposable manometer for sensing and displaying air pressure in a vicinity of a Magnetic Resonance Imaging System, the disposable manometer comprising: a) a housing having a first chamber and a second chamber separated by a movable wall, said movable wall carrying a stem coupling having at a first end, a stem coupling opening with an outwardly extending groove and having a distal surface engaging a non-ferromagnetic resilient member 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 patient breathing system and said second chamber being vented to atmosphere; d) whereby air pressure from the patient breathing system 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.