There are a variety of devices used to carry patients. Longboard, scoop stretcher, basket stretcher, wheeled stretcher, light stretcher, portable stretcher, stair chair Sometimes we’ll just use a blanket, or do a direct carry.
Use spreaders or pliers to open, remove ball, slide ring out. Done. Use spreaders or pliers to open, remove ball, slide ring out. Done.
Either it isn't screwed on tight enough or if its a captive ball ring, the ring isn't tight enough. So either use pliers to squeeze the ring tighter or screw it on.
I assume that you're talking about a captive ball ring. The ball is probably just too loose. Just tighten the ring around the ball by squeezing the ring with pliers. Unless of course you have ring closers. Those are easier to use but pliers do in a pinch. If you don't tighten it, the worst that could happen is that the ball falls out and you lose it. If that happens, you could put a piece of eraser or clay in place of the ball for temporary use.
If you have a navel gem the top ball unscrews. If you have a captive bead ring you need to see your local professional body piercer and have him/her use the ring expanding pliers to loosen the captive bead.
Generally you unscrew the top ball (the one on the top, outside of your belly button rather than on the under, inside), but sometimes if the ball is on there really tight you'll need to use pliers to unscrew it. Just be careful and make sure you don't lose the ball, but if you do you can always use a ball from another ring.
One type is called a stretcher and it is a framework of two poles with a long piece of canvas slung between them. The other is called a gurney which is a wheeled stretcher used for transporting hospital patients.
The plural of stretcher-bearer is stretcher-bearers.
If you are unable to get the ball off using your fingers, you will have to use pliers to get the ball off. It is best to have someone else use the pliers and not try to do it by yourself.
stretcher is nothing but an objejct that stertches.
The hot ball will heat up the ring as it passes through, potentially causing thermal expansion of the ring's material. If the ball is significantly hotter than the ring, it may also cause the ring to deform or melt depending on the materials involved.
A nail stretcher would be a fictional tool... think "dollar stretcher".