Anchoring cannula

A cannula comprising: a cannula body possessing a longitudinally extending central working passage and at least one anchoring member, the anchoring member selected from the group consisting of shape memory polymers, shape memory metals, shape memory alloys, electroactive polymers, and combinations thereof, wherein the anchoring member has a permanent shape comprising angular V shape protrusions and a temporary shape comprising a smooth, flat configuration, wherein in the temporary shape the anchoring member has gaps that run longitudinally with the surface of the longitudinally extending central working passage with no shape memory materials or electroactive polymers in the gaps, and wherein the gaps permit the expansion and formation of the angular V shape protrusions.