Single port instrument access device

A medical device comprising:

• an envelope comprising a proximal opening;
• and
• a proximal coupling component in the proximal opening of the envelope;
• the proximal coupling component comprising:
• an outer element coupled to the envelope,
• an orbital element comprising a first opening and a second opening,
• an entry guide receptacle received in the first opening, and
• a gear train coupling the entry guide receptacle to the outer element;
• the gear train comprising:
• a first gear fixedly positioned in the proximal opening of the envelope,
• a second gear fixedly coupled to a periphery of the entry guide receptacle, and
• one or more intermediate gears engaged with the first and the second gears,
• the first gear being rotatable relative to the second gear without rotating around a central axis of the first gear, and
• the one or more intermediate gears being rotatable and translatable relative to the first gear and the second gear.