so sleeve 60 may be disposed about the device so that the non sterile device is encapsulated within the interior of sleeve 60 therefore the non sterile device may be brought back into the sterile surgical field because the sleeve 60 protected the device from contamination while in the non sterile field as illustrated in fig2 aperture 25 and sleeve 60 are initially covered by membrane 40 which is attached to the first surface 15 or second surface 17 of drape 10 membrane 40 may be disposed about aperture 25 such that membrane 40 reinforces the edges of the aperture 25 this reinforcement provides further protections against tearing or abrasion about aperture 25 and drape 10 prior to using aperture 25 the user must first open aperture 25 by tearing the perforations 41 that are disposed within the surgical drape 10 the perforations 41 facilitate the controlled tearing of the drape when desired surgical drape 10 which may compromise any flexible disposable woven non woven or plastic material has a first surface 15 and second surface 17 as used within this disclosure it should be understood that the second surface 17 will be in contact with the patient 39 s body if drape 10 is utilized to cover the patient 39 s body during surgical procedures alternatively if drape 10 is utilized as a screen between the patient 39 s body and the anesthesiologist perfusionist then it should be understood that the second surface 17 will be facing the anesthesiologist as illustrated in fig1 while the first surface 15 of drape 10 will face away from the anesthesiologist drape 10 is preferably constructed of a non woven material which has been treated to.