Automatic analysis device and automatic analysis method

An analysis method for an automatic analysis device including:

• a nozzle from which a second liquid substance is discharged into a vessel storing a first liquid substance;
• a control processor configured to control a horizontal position and orientation of the nozzle in accordance with a liquid volume of the second liquid substance and a viscosity of the second liquid substance;
• a dispensing unit that uses the nozzle to dispense the second liquid substance into the vessel;
• and
• a detection unit that detects light with which a mixture of the first liquid substance and the second liquid substance is irradiated,
• wherein
• a discharge end of the nozzle is cut in an oblique direction so as to control a direction of the second liquid substance upon discharge from the discharge end of the nozzle being positioned at one of a short side of said discharge nozzle and a long side of said discharge nozzle with respect to an inner wall of the vessel,
• the vessel comprises an annular protruding portion disposed on an inner wall of the vessel, and
• the analysis method comprising:
• controlling, by the control processor, the horizontal position and orientation of the nozzle to position a short side of the nozzle on the inner wall surface side of the vessel so that the nozzle in contact with the protruding portion is set a distance away from the inner wall surface of the vessel so as to cause a loss of discharge energy of the second liquid substance by colliding with a bottom of the vessel after exiting the nozzle, based on a relationship between the liquid volume of the second liquid substance to be discharged and a liquid volume of the first liquid substance in the vessel and a relationship between the viscosity of the second liquid substance and a viscosity of the first liquid substance;
• controlling, by the control processor, the horizontal position and orientation of the nozzle to position the short side of the nozzle on the inner wall surface side of the vessel so that
• a first portion of the second liquid substance flows at said short side of the nozzle as the first portion exits the nozzle nearest to the inner wall of the reaction vessel and contacts with said inner wall at a first location spaced apart from said discharge end of said nozzle,
• a second portion of the second liquid substance flows along said first portion as the second portion exits the nozzle and contacts with said inner wall at a second location spaced apart from said discharge end of said nozzle, said second location being farther from said discharge end of said nozzle than said first location, and
• a third portion of the second liquid substance flows at said short side of the nozzle along said second portion as the third portion exits the nozzle farthest from the inner wall of the reaction vessel and contacts with said inner wall at a third location spaced apart from said discharge end of said nozzle, said third location being farther from said discharge end of said nozzle than said second location;
• and
• controlling, by the control processor, the horizontal position and orientation of the nozzle to position the short side of the nozzle on the inner wall surface side of the vessel to cause each of the first, second, and third portions of the second liquid substance to flow along the inner wall after contacting with the inner wall at said first location, said second location, and said third location, respectively, to achieve stirring of the second liquid substance at a friction-caused reduced rate to prevent generation of bubbles caused by the second liquid substance colliding with the first liquid substance.