Automatic analysis device

An automatic analysis device comprising:

• a reactor vessel;
• a reaction disk configured to hold the reactor vessel;
• a sample dispensing mechanism configured to dispense a sample into the reactor vessel;
• a reagent dispensing mechanism configured to dispense a reagent into the reactor vessel;
• an optical system including a light source configured to emit light into a mixture of the sample and the reagent dispensed into the reactor vessel, and a detector configured to detect the light emitted from the light source;
• a washing mechanism configured to wash the reactor vessel;
• and
• a computer,
• wherein the computer is programmed to analyze the sample based on the light detected by the detector,
• wherein the washing mechanism includes:
• a washing liquid supply nozzle configured to supply a washing liquid to the reactor vessel after the analysis;
• a washing liquid suction nozzle configured to suction the supplied washing liquid;
• a washing tip-equipped washing liquid suction nozzle provided with a washing tip on a bottom end of the washing tip-equipped washing liquid suction nozzle;
• and
• a rough suction nozzle that has a shorter length than the washing tip-equipped washing liquid suction nozzle,
• wherein the washing tip includes three or more regions having different cross-sectional areas, including an upper portion, a lower portion, and an intermediate portion located between the upper portion and the lower portion, the cross-sectional area of the intermediate portion being the least among the upper portion, the lower portion, and the intermediate portion, and the cross-sectional area of the lower portion being greater than the cross-sectional area of the intermediate portion and less than the cross-sectional area of the upper portion,
• wherein the computer is programmed to:
• control the rough suction nozzle to suction liquid in the reactor vessel such that a portion of the liquid remains in the reactor vessel so a bottom surface of the reactor vessel is not exposed, and
• after the rough suction nozzle suctions the liquid in the reactor vessel, control the washing tip-equipped washing liquid suction nozzle provided with the washing tip to suction the portion of the liquid remaining in the reactor vessel,
• wherein each of the upper portion, the lower portion, and the intermediate portion of the washing tip is configured as a rectangular parallelepiped structure, and
• wherein the washing liquid suction nozzle extends completely through the washing tip, and a portion of the washing liquid suction nozzle that extends completely through the washing tip has a uniform diameter.