Hitachi, Ltd.

Kyoichi Ozawa

Ryuji Tao

Isao Shindo

A gas mixing device of a blood gas analyzer has a substrate made of a material such as silicon and a plate having a flat smooth surface, made of a material such as glass. The plate is bonded to the substrate. The substrate has a plurality of fine elongated grooves extending between inlet and outlet ports formed in the plate. Different gases are introduced through the respective inlet ports, and combined with each other in the gas mixing device. The levels of flow resistance in branch grooves are so determined that the different gases are mixed at predetermined mixing ratios for delivery to the outlet ports. Further, the analyzer includes the gas mixing device and a measuring unit equipped with a plurality of gas measuring electrodes. The mixture gas from the gas mixing device is made to bubble through a buffer solution in a reservoir for producing a standard liquid measuring unit that is delivered at predetermined time intervals to the analyzer for calibration.

Gas mixing device and gas analyzer making use of the same

A sample is sucked from a probe into a column filled with a porous material and successively thereafter an auxiliary liquid is sucked from the probe and passed through the column, whereby unnecessary components in the sample are moved through the column and the component which it is desired to analyze remains within the column. Then, a discharging liquid is passed through the column and the probe, whereby the desired component in the column is discharged through the probe.

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Mito, Japan

Kyoichi Ozawa