Robotic surgical assemblies

An instrument drive connector for selectively interconnecting a surgical instrument having an end effector that is configured to perform a function and an instrument drive unit that is configured to actuate the end effector, the instrument drive connector comprising:

• a housing assembly defining a bore;
• a plurality of drive assemblies at least partially disposed within the bore of the housing assembly, each drive assembly of the plurality of drive assemblies including:
• a drive screw including an elongated threaded body and being rotatably supported within the housing assembly;
• and
• a drive nut threadedly engaged with the elongated threaded body of the drive screw such that rotation of the drive screw results in longitudinal movement of the drive nut;
• and
• a plurality of drive members in mechanical cooperation with the instrument drive connector and the end effector, each drive member of the plurality of drive members including a proximal end portion secured to a respective drive nut of one of the plurality of drive assemblies such that longitudinal translation of the respective drive nut causes longitudinal translation of the drive member to drive a function of the end effector.