Patent ID: 8192700

Claim:
A tissue piece treating apparatus comprising: a processing chamber for accommodating a tissue piece; a plurality of chemical tanks storing chemicals with sequentially different concentrations for performing immersion treatment of the tissue piece; a selection valve for connecting the processing chamber to the selected chemical tank; an open/close valve being provided to a pipe connecting the selection valve to the processing chamber so as to open/close the pipe; a pump for increasing and reducing inner pressure of the processing chamber: a detection sensor for detecting that a prescribed amount of the chemical is supplied to the processing chamber; and a control section being attached to a main body of said apparatus, the control section controlling the selection valve, the open/close valve and the pump so as to supply the chemical stored in the selected chemical tank to the processing chamber, whose inner pressure has been reduced by the pump, via the open/close valve and so as to discharge the chemical, which has been used for performing immersion treatment of the tissue piece, from the processing chamber, whose inner pressure has been increased by the pump, and return the same to the selected chemical tank via the selection valve, thereby the immersion treatment of the tissue piece can be performed in the chemicals from the lowest concentration to the highest concentration sequentially, wherein new chemical tanks are integrally attached to a sidewall face of the main body, the new chemical tanks have larger capacities than the chemical tanks, store unused new chemicals of the same types as the chemicals stored in the chemical tanks and have inner wall faces respectively reinforced by reinforcing members so as to prevent deformation of the new chemical tanks when inner pressure is reduced and increased for supplying and discharging the new chemical, pipes from the new chemical tanks are connected to the selection valve so as to supply the new chemicals stored in the new chemical tanks to the processing chamber, and the control section controls the selection valve, the open/close valve and the pump so as to supply the new chemical of an amount corresponding to an insufficiency of the amount of the chemical from the new chemical tank to the processing chamber when a detection sensor detects that the amount of the chemical supplied to the processing chamber is insufficient, thereby the immersion treatment can be continued.