Robotic instrument driven element

An apparatus comprising:

• a surgical instrument comprising a driven disk, the driven disk comprising a driven interface, the driven interface comprising a semi-circular groove and a flexible rotation disable element, the semi-circular groove comprising opposite first and second ends, and the flexible rotation disable element extending between the first and second ends of the semi-circular groove.

An apparatus comprising:

• means for engaging a surgical instrument drive interface to drive a surgical instrument driven interface on a condition that the drive interface contacts the driven interface at a first rotational orientation with reference to the driven interface;
• and
• means for disabling the surgical instrument drive interface from rotating the surgical instrument driven interface on a condition that the drive interface contacts the driven interface at a second rotational orientation with reference to the driven interface and flexes a rotation disable element away from the drive interface.