The phrase "inflated balloon" refers to a balloon that has been filled with air or gas, causing it to expand and become bigger and rounder. Full definition
Kids will adore these ice cream cone balloons that they can hold which are made by adding a paper cone to the bottom of a small inflated balloon. (thespruce.com)
If this occurs, try replicating the breathing technique you use when inflating a balloon. (skinnyfit.com)
Either you switch the valve to the pressure source to inflate the balloon in the joint, and thus extend the limb, or you switch the valve to atmosphere to deflate the joint and thus retract the limb. (kavlifoundation.org)