Surgical access device with fixation mechanism

A surgical access device comprising:

• a cannula comprising a proximal housing and an elongated portion defining a channel and a longitudinal axis and having a distal tip opposite the proximal housing;
• a fixation mechanism mounted to the elongated portion;
• and
• a biasing element engaged between the proximal housing and the fixation mechanism, the biasing element applying a biasing force to the fixation mechanism in a distal direction to urge the fixation mechanism toward the distal tip, and the biasing element being compressible upon application of an external force to the fixation mechanism in a proximal direction,
• wherein the fixation mechanism comprises:
• a collar;
• a sleeve extending distally from the collar;
• and
• an expandable member having a plurality of sections that move into a folded configuration in which a mid-portion of each section of the plurality of sections moves away from the longitudinal axis and into an unfolded configuration in which a respective diamond-shaped opening is formed between the plurality of sections.

A surgical access device comprising:

• a housing;
• an elongated portion extending from the housing to a distal tip;
• a collar translatable longitudinally on the elongated portion;
• a biasing element engaged between the housing and the collar and applying a biasing force against the collar in a distal direction toward the distal tip;
• and
• a sleeve comprising an expandable portion, wherein the expandable portion is movable into a folded configuration with translation of the collar distally toward the distal tip and into an unfolded configuration with translation of the collar proximally against the biasing force, and
• wherein the expandable portion comprises a plurality of diamond-shaped openings in the unfolded configuration.