You're right. Just weeks ago my wife had an appendectomy and she had such a device on her legs which would inflate and deflate periodically.
I'm not so observant that I made any connection with my idea regarding an improved CPR technique.
The device used on my wife was plugged into the wall. It operated on a relatively slow cycle; perhaps every two to five minutes. I vaguely recall some inflated device used to stabilize accident victims. I don't recall whether it was intended to affect blood circulation or not. It might have been intended to reduce internal bleeding.
Portable emergency defibrillators are getting more common due to the improvements in computer and communication technology. A device virtually identical to the device used on my wife, with a more rapid cycle, could accompany every defibrillator. The cycle time of the device could even be used to set the pace for the chest compressions.
I expect that in ten years we will see this become quite common. As one of the older Baby-Boomers, I'm in favor of such improvements.
They used one of those circulation “pants” thingies on hubby after they removed his kidney and said it had something to do with circulation/blood clots that type of thing. What you described is exactly what I was referring to. I don’t know why I thought of that machine right away when you were talking about an improved CPR enhanced by circulation but it just popped in my head that that might work.
I just asked my daughter (nurse) what they are called, they are pneumatic compression devices.