Manometer for infusion apparatus

A manometer for measuring the hydrodynamic pressure of fluids parenterally administered to a patient, said manometer comprising:

• a housing, said housing having a fluid inlet means and a fluid outlet means;
• a continuously open passageway formed in said housing, said passageway accomodating continuous flow of fluid therethrough from said fluid inlet means to said fluid outlet means;
• a pressure measuring chamber formed in said housing, one end of said measuring chamber being in fluid communication with said passageway and said pressure measuring chamber having at the other end thereof an enclosed air space that defines a non-expansible volume;
• reference means, associated with said pressure measuring chamber, for indicating the pressure of the fluid flowing through said passageway;
• and
• means for adjusting the size of said enclosed air space so as to permit said manometer to be normalized for use at any of a plurality of different altitudes.

A manometer for measuring the hydrodynamic pressure of fluids parenterally administered to a patient, said manometer comprising:

• a housing, said housing having a fluid inlet means and a fluid outlet means;
• a continuously open passageway formed in said housing, said passageway accomodating continuous flow of fluid therethrough from said fluid inlet means to said fluid outlet means;
• a pressure measuring chamber formed in said housing, one end of said measuring chamber being in fluid communication with said passageway, said measuring chamber having at the other end thereof an enclosed air space that defines a non-expansible volume;
• reference means, associated with said pressure measuring chamber, for indicating the pressure of the fluid flowing through said passageway;
• a screw engaged in at least an upper portion of said enclosed air space, said screw having a throughbore therein and being adjustable so as to selectively enlarge or decrease the size of said enclosed air space, thereby permitting said manometer to be normalized for use at any of a plurality of different altitudes;
• means for sealing the leading end of said screw in fluid tight relation within said enclosed air space;
• filter means interposed in the throughbore of said screw;
• valve means for venting the enclosed air space of said pressure measuring chamber through said throughbore to the ambient air when said valve means are opened;
• and
• screw adjustment indicator means for indicating the position of said screw in relation to one or more predetermined positions each of which correspond to a setting for a different altitude.

A manometer for measuring the hydrodynamic pressure of fluids parenterally administered to a patient, said manometer comprising:

• (1) a housing, said housing comprising:
• a fluid inlet means and fluid outlet means;
• a first hollow cylinder, the hollow of said cylinder providing a continuously open passageway for continuous flow of fluid therethrough from said fluid inlet means to said fluid outlet means;
• and
• a second hollow cylinder concentrically spaced from and circumscribing said first cylinder so as to form a normally closed pressure measuring chamber defined by a non-expansible volume therebetween, said first cylinder having an outlet opening at the base thereof which provides fluid communication between said pressure measuring chamber and said passageway;
• and
• (2) reference means, associated with said pressure measuring chamber, for indicating the pressure of the fluid flowing through said passageway.

A manometer for measuring the hydrodynamic pressure of fluids parenterally administered to a patient, said manometer comprising:

• (1) a housing, said housing comprising:
• fluid inlet means and fluid outlet means;
• a first hollow cylinder, the hollow of said first cylinder providing a continuously open passageway for continuous flow of fluids therethrough from said fluid inlet means to said fluid outlet means;
• and
• a second hollow cylinder adjacent to said first hollow cylinder, the hollow of said second cylinder providing a normally closed pressure measuring chamber defined by a non-expansible volume, and said first and second cylinders having at the base thereof a connecting opening for providing fluid communication between said passageway in said pressure measuring chamber;
• (2) reference means, associated with said pressure measuring chamber, for indicating the pressure of the fluid flowing through said passageway;
• and
• (3) valve means for venting said pressure measuring chamber to the ambient air.