European Patent Office
A device for collecting flatus gas from a human or animal subject, the device comprising a gas-tight collecting tube 10 for insertion into the rectum of the subject and retaining means comprising a pair of O rings 18 locatable in the subject's inter-sphincter groove[...]Much more HERE
I note with some interest that this patent application has expired due to non-payment of applicable fees. Would it be considered "torture" to stick gas collection tubes up the bums of terrorists in the name of scientific research?
H/T Hell Bent