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,