A protective sheath including a first portion configured to receive a medical instrument. The protective sheath also includes a second portion configured to accommodate movement of a distal end of the medical instrument within the second portion. The second portion is moveably coupled to the first portion. The protective sheath is configured to control contamination of the medical instrument when the medical instrument and the protective sheath are placed within a patient.一種保護鞘,其包括一第一部分,該第一部分被組構以接受一醫療器材。該保護鞘亦包括一第二部分,該第二部分被組構以容納於該第二部分內該醫療器材之一遠側端的運動。該第二部分係可移動地偶接至該第一部分。該保護鞘係被組構以於該醫療器材及該保護鞘被置於一病患內時控制該醫療器材的污染。1000...保護鞘1010...第一部分1020...第二部分1022...罩體部分1024...次部分1026...遠側孔口1030...套筒1040...尺夾