The mechanism of action for an extractor pump involves placing the suction cup of the pump over the bite or sting and creating a vacuum by pulling a plunger or squeezing a bulb. This vacuum is intended to draw venom out of the wound site. The idea is that by removing some of the venom, the severity of the envenomation can be reduced. However, the effectiveness of this method is contingent upon several factors, including the depth of venom injection and the time elapsed since the bite or sting.
