There is, but due to the confines of the machine that may bring immense harm to the pokémon- as I'm afraid any damage to the machine may do the same given the pokéballs can only protect them so much as well in such circumstances.

[Clavell did lift a small ball from his pocket that enlarged itself- much like the balls from the machine would behave and seemed to be a similar design, albeit a different color.]

A pokéball is something designed with their safety and health in mind, given they rest and sleep within them naturally, and some even heal within them, when pokéballs are necessary. It is all that is protecting the ones inside of that thing.