Protective cover for maintaining uncontaminated environment, system and method for undistorted transmission of visible light beam

摘要

A sterile drape serving to preserve the sterile integrity of an operating field is disclosed. The drape has a rigid optically clear window which allows a visible light beam, such as a laser beam, to exit a targeting device without refraction or distortion that could result in misalignment of the visible light beam relative to a targeted object. The rigid optically clear window is made of a material having an ability to transmit light and which ability remains substantially unchanged after the drape has undergone a gamma radiation sterilization process.