Patent ID: 8623299

Claim:
A tissue treating apparatus, which supplies different kinds or different concentrations of liquid chemicals to and discharges the same, in a predetermined order, from a processing chamber containing a tissue specimen so as to perform a tissue specimen infiltration treatment, comprising: a processing chamber; a plurality of liquid-chemical reservoirs operable to store liquid chemicals to be used in the tissue specimen infiltration treatment; a cleaning-liquid reservoir operable to store a used liquid chemical which is a liquid chemical that has become useless in the tissue specimen infiltration treatment and which is usable as a cleaning liquid for removing a residual liquid chemical remaining in the processing chamber; and a valve operable to transfer (1) a liquid chemical from one of the plurality of liquid chemical reservoirs or a used liquid chemical from the cleaning-liquid reservoir to the processing chamber, and (2) a used liquid chemical from one of the plurality of liquid-chemical reservoirs to the cleaning-liquid reservoir.