Here is a one-page .pdf article on an experiment to determine if the Sawyer Extractor was valuable in snakebite treatments:
http://www.fresno.ucsf.edu/em/posters/alberts_snake_bite.pdfIf you want to skip to the conclusion:
"The Extractor™ is capable of producing significant suction at the wound site. This is evident in that the device extracted blood over the fifteen minutes of suction and left a suction mark several hours post experiment.
"However, the Extractor™ was unable to remove the mock venom from our simulated snakebites.
"Our data suggests that the use of this device in particular and suction in general may not be useful for reducing the total body venom load after a venomous snakebite."
Sue