Here are a couple of more articles. I can't get the abstract online. Flipping thru 4th ed of Wilderness Medicine, the literature for or against the extractor is more anecdotal than experimental. There is one study I have read, but can't find now, that states the Extractor will concentrate venom near the suction site (instead of completely removing it) and this will lead to more local tissue damage.


Gellert GA
Snake-venom and insect-venom extractors: an unproved therapy.
N Engl J Med (United States), Oct 29 1992, 327(18) p1322



Gold BS
Snake venom extractors: a valuable first aid tool.
Vet Hum Toxicol (United States), Jun 1993, 35(3) p255

Forgey WW
More on snake-venom and insect-venom extractors.
N Engl J Med (United States), Feb 18 1993, 328(7) p516-7