Surgical access device with fixation mechanism

A surgical access device, comprising:

• a cannula body including a housing and an elongated portion extending distally from the housing, the elongated portion defining a longitudinal axis and a channel, the elongated portion including a pin;
• and
• a fixation mechanism disposed in mechanical cooperation with the elongated portion of the cannula body, the fixation mechanism including:
• a collar at least partially surrounding a first portion of the elongated portion of the cannula body, the collar being longitudinally translatable relative to the elongated portion of the cannula body, and being rotatable about the longitudinal axis relative to the elongated portion of the cannula body, the collar including a cam surface which slidingly engages the pin of the elongated portion;
• a sleeve extending distally from the collar;
• an expandable member extending distally from the sleeve and radially surrounding a second portion of the elongated portion of the cannula body;
• and
• a distal ring engaged with a distal portion of the expandable member and being fixed from longitudinal translation relative to the elongated portion of the cannula body,
• wherein distal translation of the collar relative to the elongated portion of the cannula body is configured to cause the expandable member to move from a first position defining a first gap between a middle portion of the expandable member and the elongated portion of the cannula body, to a second position defining a second gap between the middle portion of the expandable member and the elongated portion of the cannula body, the second gap being greater than the first gap.