Does anyone know how to construct a stage blood pump?

Question

I need to be able to rig tubing up a jacket and out the shoulder area so blood can spurt in a arterial wound-like fashion. The actor's arm is being ripped off so his other arm, concealed under his jacket, will be free to operate a pump of some sorts. (I'm assuming that will be needed to pull such an effect off). Any tips would be greatly appreciated!

Answer 1

The only time I've done this, all that was required was a single blood spurt, so we constructed a balloon-like thing for the actor to hold in his other hand, which he squeezed once. I don't know how you'd manage multiple spurts. Sorry!

Answer 2

Sorry, I don't know. :(