Surgical introducer with guidance system receptacle

A surgical access port assembly comprising:

• a shaft retainer comprising:
• a receiver having:
• a receiver channel extending in a longitudinal direction and configured to receive a shaft in a proximal open end of the receiver channel, and limit movement of the shaft in a lateral direction that is perpendicular to the longitudinal direction, and
• a first threaded surface, and
• a lock having:
• a central passage extending in the longitudinal direction, and
• a second threaded surface,
• wherein:
• the lock and receiver are movable between a first configuration in which the lock and receiver allow the shaft to move relative to the lock and receiver along the longitudinal direction, and a second configuration in which the lock and receiver prevent the shaft from moving relative to the lock and receiver along the longitudinal direction, and
• the lock is rotatable relative to the receiver to engage the first threaded surface with the second threaded surface to thereby move the lock and receiver between the first configuration and the second configuration;
• an introducer extending along the longitudinal direction from a proximal introducer end to a distal introducer end, the distal introducer end defining a tapered outer surface that reduces in size in a distal direction extending away from the proximal introducer end;
• and
• a retractor removably attached to the introducer, the retractor comprising a retractor sidewall defining a hollow retractor passage extending from a proximal retractor end to a distal retractor end, wherein the retractor is configured to selectively secure to a remainder of the surgical access port assembly with the tapered outer surface of the introducer extending in the longitudinal direction distally beyond the distal retractor end, and wherein the hollow retractor passage has a retractor passage cross-sectional profile as viewed along the longitudinal direction, wherein the retractor passage cross-sectional profile comprises an elongated non-circular shape.