An inkjet printhead that has an array of nozzles arranged in adjacent rows, each nozzle having an ejection aperture and a corresponding actuator for ejecting printing fluid through the ejection aperture, each actuator having electrodes spaced from each other in a direction transverse to the rows. In this constitution, an ink residual amount V in the subtank during recording or at the end of recording is selected to be V>vb in which V is the ink residual amount in the subtank during recording or after the end of recording, b is a nonvolatile component ratio of the ink,and v is a volume of a liquid chamber of the recording head. Inner surface of the first and second portions define a cavity having a pivoting member is movably disposed therein. for use in a transplant, or may be an isolated organ inside or attached to the body but isolated from the blood flow.