Patent ID: 8888813

Claim:
A retractor cannula device comprising: a tubular assembly comprising at least one lumen configured to hold an endoscopic system; and a retractor assembly having a longitudinal midline and located at the distal end of the tubular assembly, the retractor assembly including: a first element with a distal tip having a distal-most portion, a convex outer surface and a concave inner surface; and a second element with a convex outer surface and a concave inner surface, the first and second elements comprising an optically transparent material, wherein the retractor assembly further includes an open configuration and a closed configuration, and the first element is pivotable with respect to the tubular assembly such that, as the retractor assembly transitions from the open configuration to the closed configuration, the distal-most portion of the distal tip extends across a line that is parallel to and passes through the longitudinal midline of the retractor assembly and extends through the convex outer surface of the first element.