I think you and dewophile are using the word systemic differently than I am. Yes, leg compression has some beneficial effect all over the body. But would leg compression be considered a valid means of preventing a clot in, say, the coronary arteries following a stent procedure?
I doubt it. Rather, I think the compression device that’s the subject of this thread will be limited to cases where the likely origin of a clot is in the legs, such as following hip- or knee-replacement surgery. And, even then, I don’t see it as a replacement for anticoagulation.
I think that patients need to pay for using the device after they are being discharged from the hospital and that might also be a problem although a minor one.