Portable oxygen analyzer

Claim 1

In combination with patient breathing therapy apparatus including a therapy tube for transmitting a respiratory therapy breathing mixture to a patient, and a "T" fitting in said therapy tube adjacent a patient and having first and second legs connected to said tube and a third connecting leg, a self-contained, palm size, hand held secondary oxygen monitoring device, said self-contained monitoring device being configured and arranged to be held in one hand and to be inserted into and removed from said "T" fitting by manipulation with a single hand, to enable monitoring of the oxygen content of the breathing mixture adjacent a patient, said monitoring device comprising: a generally rectangular housing having an elongated body section adapted to fit the palm of a hand, an elongated tubular neck forming an oxygen sensor receptacle section of relatively small diameter, said neck having a free outer end slidably insertable into and removably received within said third connecting leg of said "T" fitting, said body section having a thickness and width greater than said sensor receptacle section diameter, a housing transition section integral with both said body section and tubular neck, said housing transition section being smoothly tapered from a first portion thereof adjacent said body section that has a configuration and dimensions of said body section to a second portion thereof adjacent said neck that has a configuration and dimensions of said neck, electrical control and display circuitry mounted within said body section, said circuitry including a circuit board having a tapered section in said housing transition section, having an end positioned at an inner end of said tubular neck, a socket means on said end of said circuit board tapered section, said housing being configured and arranged to form a handle for the monitoring device and to provide a mounting an enclosure for said electrical control and display circuitry, and an elongated tubular oxygen sensor slidably inserted into and received within said sensor receptacle section and having a plurality of contact pins received in said socket means, whereby said tubular neck forms a connector fitting for connecting the monitoring device to said "T" fitting.