A double cylinder system is disclosed, comprising at least one controller being adapted to transmit hydraulic control signals； at least one slave being in fluid communication with the controller and being configured to respond to the hydraulic control signals transmitted by the controller； and at least one control line providing hydraulic communication between the controller and the slave. Also disclosed is a surgical device, comprising at least one controller located at a proximal end of the device, the controller being adapted to transmit hydraulic control signals； at least one manipulator, the manipulator being configured to be controlled by a human hand and to actuate the controller； at least one slave located at a distal end of the device, the slave being in fluid communication with the controller and being configured to respond to the hydraulic control signals transmitted by the controller； and at least one control line providing hydraulic communication between the controller and the slave.
