An actuator for controlling a compressive force of a detachable laparoscopic grasper head. The actuator includes a handle unit comprising a movable lever, an outer tube member proximally connected to the handle unit and, when in use, distally connected to a first member of a detachable grasper head, a transmission member which comprises at least partially an elastic portion. The transmission member is axially arranged inside said outer tube member. The transmission member is proximally connected to the movable lever and, when in use, distally connected to a second member of the detachable grasper head. The transmission member is configured to transfer a lever force applied when moving the movable lever for actuating a compressive force by the grasping head depending on the lever force.
