Positioning - calf ulcer

Our user asked: "Hello - my father (age 75) recently had a bypass operation on his right leg due to poor venous circulation. We are told that the operation was a success; however, because he waited so long to get treatment, he now has a 4.5" stage III ulcer on the back of his calf. He is being seen in a wound clinic and they tell us he is healing. He is not diabetic, thank goodness. My question - his lower leg still swells at times - we know he needs to elevate his leg but we are having a hard time figuring out how to do this because nothing can touch the back of his calf. Can you recommend positioning equipment for this situation? Many thanks!"