An image recording apparatus includes a casing, an image recording unit, a first conveying unit, a second conveying unit, a first support member, and a second support member. One end of vertical post is mounted on a surgical table; and the other end is to be slid on and pivoted by the horizontal arm. The system may employ a novel sealing system that uses either a viscous solution or a series of laminated materials to seal either the needle entry point or the puncture side of the material in its entirety, thereby eliminating the use of known sealing patches that cover the porous webbing in testing. The electrostatic ink jet recording apparatus includes an ink ejecting device for ejecting the ink droplets at predetermined frequency corresponding to the ink concentration and the ink concentration detecting apparatus.