Patent ID: 7401533

Claim:
A dissolution tester comprising: a constant-temperature-water tank containing constant-temperature water; a vessel comprising a main body having a bottom and a top opening for introducing a dissolution test liquid, a desired portion of the main body being immersed in the constant-temperature water inside the constant-temperature-water tank; a vessel lid disposed at the top opening of the vessel and having a suction hole for sucking up the test liquid; a nozzle holder which is disposed above the vessel lid and which can move up and down; a suction nozzle which is suspended from the nozzle holder, which can move up and down together with the nozzle holder, and which sucks up the test liquid inside the vessel when inserted through the suction hole in the vessel lid; and an administration mechanism for automatically administering a sample for conducting a dissolution test into the vessel at a predetermined timing, wherein the administration mechanism comprises an administration hole provided at the vessel lid, for introducing the sample into the vessel; a sample receiver provided at the vessel lid, for freely opening and closing the administration hole, for holding the sample at the vessel lid when the administration hole is closed, and for administering the sample into the vessel via the administration hole when the administration hole is open; and a manipulator rod provided at the nozzle holder, for opening the administration hole by making contact with the sample receiver when carrying out administration, and wherein, when carrying out administration, by lowering the manipulator rod together with the nozzle holder to make the manipulator rod contact the sample receiver and to push the sample receiver open in the downward direction with the manipulator rod, the administration hole is opened, and the sample, which is set in advance on the sample receiver, is made to fall into the vessel via the administration hole.