Okay, so a hyperbaric stretcher is like a special bed that helps sick or injured people get better faster. It's called "hyperbaric" because it gives the person inside more air pressure than the air outside. Imagine if you go swimming deep in the pool and your ears feel a little funny because of the pressure? It's a bit like that.
When someone goes inside the hyperbaric stretcher, it helps more oxygen get into their body. Oxygen is like a power-up for your cells because it helps them heal faster. It's like when you drink orange juice when you have a cold -- it helps you get better faster.
The stretcher is like a big bubble that you lie down in, and then they pump more air inside to make the air pressure higher. It's kind of like being inside a bubble bath, but instead of water, it's air.
Doctors use hyperbaric stretchers to help people who have certain health issues, like wounds that won't heal or carbon monoxide poisoning (which is like a very bad headache). By using the stretcher, they can help the person heal faster and feel better sooner.