Surgical instruments with reflective mirror-like surfaces

A surgical method, comprising:

• advancing a cannula through a first portal to a target site in a patient's body, the cannula comprising:
• an elongate body extending along a longitudinal axis, the elongate body having a proximal end, a distal end, and a lumen extending through the elongate body between openings at the proximal and distal ends, and
• a first flange member that extends at least partially around at least one of the oepnings, the first flange member having a first surface, wherein at least a portion of the first surface is reflective, and wherein an angle at which the first flange member is oriented relative to the longitudinal axis of the elongate body is adjustable;
• advancing an imaging device comprising at least one image sensor through a second portal towards the target site;
• performing a surgical function at the target site;
• and
• viewing a result of the surgical function with the imaging device by directing the imaging device at at least the portion of the first surface of the cannula that is reflective such that at least the portion of the first surface that is reflective displays a reflected image of the result of the surgical function at the target site.