A few weeks ago I saw a post on Twitter about an "air ambulance jet suit" being tested in the Lake District of northern England. If this invention is proven to be viable, it could mean that a paramedic could "fly" to an injured hiker or climber in difficult terrain (think Grand Canyon) in a matter of minutes, rather than taking hours or more on foot. If this is the case, it could mean the difference between life and death for some accident victims.
Here's a clip from CBS News showing footage from the test:
Ramble On: A History of Hiking
Exploring Glacier National Park
Exploring Grand Teton National Park