A porous protective sheath for active extraction media used in solid phase microextraction (SPME). The sheath permits exposure of the media to the environment without the necessity of extending a fragile coated fiber from a protective tube or needle. Subsequently, the sheath can pierce and seal with...http://www.google.ca/patents/US6871556?utm_source=gb-gplus-sharePatent US6871556 - Porous protective solid phase micro-extractor sheath
