Patent ID: 8672489

Claim:
A lens assembly for use with a surgical drape to create a barrier between a sterile field of an operating room and a surgical microscope, the surgical microscope having an objective lens circumscribed by an objective lens housing, the lens assembly comprising: an annular lens housing configured to fix to the surgical drape, the annular lens housing being configured to press-fit onto the objective lens housing and thereby removably attach the lens assembly to the surgical microscope, the annular lens housing including an arcuate slot; an annular lens cover holder defining an internal chamber, the annular lens cover holder including a flange configured to slide into and out of the arcuate slot and thereby removably attach the annular lens cover holder to the annular lens housing such that the annular lens cover holder is selectively rotatable about a first axis; and a transparent or substantially transparent lens cover positioned inside and spanning across the internal chamber of the annular lens cover holder, the lens cover being hinged to the annular lens cover holder via one or more pivot arms to pivot about a second axis, the second axis being substantially orthogonal to the first axis.