Robotic bi-polar instruments

A surgical device, comprising:

• a tool housing including an interface configured to receive an input from a motor of a robotic surgical system to cause the interface to rotate;
• an end effector configured to engage tissue;
• and
• first and second cables that are independent from one another and that are operatively coupled to the interface and the end effector;
• wherein the rotation of the interface in a first direction is configured to cause the first cable to move proximally and thereby cause the end effector to open;
• and
• the rotation of the interface in a second direction is configured to cause the second cable to move proximally and thereby cause the end effector to close, the first direction being opposite to the second direction.