Deadly Knife adds more pain by injecting compressed air into the wound
A patent has been filed by inventor Gregory Rondinone of Connecticut for a knife that will shoot a jet of compressed air into whatever it punctures at the press of a trigger. The concentrated burst would be powerful enough to rupture soft tissue in organs, not to mention pump a ton of air (or some other gas) deep into places it shouldn’t be. It’s been suggested that the knife has valuable applications for underwater use, such as a diver staving off a large animal, both injuring the offending creature and rendering it unnaturally buoyant so that it floats away.

The handle has an internal cavity containing a compressed gas source and the blade is affixed to the handle. The blade has an internal bore running along a longitudinal axis from the handle to a point proximate a tip. The blade further has an aperture extending from a first edge to the internal bore at an angle relative to the longitudinal axis of between 15.degree. and 75.degree.. The trigger has a depressed position and a not depressed position. When in the depressed position, the internal bore communicates with the compressed gas source and when in said not depressed position, the internal bore is blocked from the compressed gas source. When a creature is pierced with the knife, the trigger is depressed injecting compressed gas into the creature greatly enhancing the incapacitating effect of the knife.
Via Device





















