Surgical saw apparatus comprising: A) a housing ; B) a drive unit with a drive axle comprising a central axis , wherein a rotation movement of the drive axle around the central axis can be generated by members of the drive unit ; C) a deflection device comprising: C1) a connecting rod that is arranged movably in the housing , with a longitudinal axis , with a rear section and with a front section ; C2) an eccentric shaft with at least one first section , which is arranged coaxially with the central axis of the drive axle and is connected to the drive axle , and with a second section which is eccentric relative to the first section , wherein the rear section of the connecting rod comprises a bearing for the eccentric second section of the eccentric shaft , and the front section of the connecting rod comprises a fastening device for a saw blade , C3) a guiding device for the connecting rod , characterized in that D) the guiding device comprises first members for limiting a movement of the connecting rod , which are movable relative to the housing and which force a translational movement of the connecting rod that is coaxial with the longitudinal axis of the connecting rod , and E) the guiding device comprises second members for limiting the movement of the first members , which are movable relative to the housing and which force a movement of the first members that is transverse with respect to the longitudinal axis of the connecting rod , wherein the connecting rod moves coaxially with its longitudinal axis and at the same time in a transverse direction that is orthogonal with respect to the longitudinal axis , wherein the longitudinal axis of the connecting rod is displaced in parallel. A) a housing ; B) a drive unit with a drive axle comprising a central axis , wherein a rotation movement of the drive axle around the central axis can be generated by members of the drive unit ; C) a deflection device comprising: C1) a connecting rod that is arranged movably in the housing , with a longitudinal axis , with a rear section and with a front section ; C2) an eccentric shaft with at least one first section , which is arranged coaxially with the central axis of the drive axle and is connected to the drive axle , and with a second section which is eccentric relative to the first section , wherein the rear section of the connecting rod comprises a bearing for the eccentric second section of the eccentric shaft , and the front section of the connecting rod comprises a fastening device for a saw blade , C3) a guiding device for the connecting rod , characterized in that C1) a connecting rod that is arranged movably in the housing , with a longitudinal axis , with a rear section and with a front section ; C2) an eccentric shaft with at least one first section , which is arranged coaxially with the central axis of the drive axle and is connected to the drive axle , and with a second section which is eccentric relative to the first section , wherein the rear section of the connecting rod comprises a bearing for the eccentric second section of the eccentric shaft , and the front section of the connecting rod comprises a fastening device for a saw blade , C3) a guiding device for the connecting rod , D) the guiding device comprises first members for limiting a movement of the connecting rod , which are movable relative to the housing and which force a translational movement of the connecting rod that is coaxial with the longitudinal axis of the connecting rod , and E) the guiding device comprises second members for limiting the movement of the first members , which are movable relative to the housing and which force a movement of the first members that is transverse with respect to the longitudinal axis of the connecting rod , <EOS>