An event in my life I'll never forget.
The outfit's Medical Officer was reviewing medical records and noted six of us over the 'magic age' of 35 who had not had their colons inspected. That was in the late '60s when the options were a Barium Enema or a rigid scope.
Our remote clinic didn't have much of an X-ray capability so the Medics decided on importing a surgeon with the gear to accomplish the scoping. A date was selected and a couple of young surgeons were recruited from the nearest Hospital to do the honors. Prep was a limited diet followed by two types of laxative taken the evening before the procedure. Chatting with a couple of older guys who had first hand knowledge of the 'drill' identified the instrument as the, "Silver Stallion."
Next morning I volunteered to be the first subject so that I could head for the chow line. Two Fleet disposable enemas acted as a rinse and moisturizer. (Instructions were to not retain them for more than a few moments.) I got gowned up and mounted the 'table.' When they 'broke it down' I nearly fell to the floor but managed to grab part of the frame so wound up rather spread-eagle. There was some talk that some of the pieces of the table were missing and there was no source of air to inflate the colon. More chatter indicated that they could improvise. With some coaching I managed a sort of pull-up and got positioned where the Surgeons wanted me.
I got my first glance at "The Stallion" was as they were lubing it. One of the surgeons coached my breathing and 'arm-pulls' and, in went the outer tube, bullet point first. Asked how I was feeling, I said fine but was getting shoulder cramps from the constant 'pull-up' I was holding to keep from sliding off the table. Once they made it through what I now know as the inner sphiincter, they stopped and removed the center rod which extracted the bullet-shaped end of the tube.
In went a tube to deliver a shot of lube. The rod with the bullet went back in followed by an advance of several inches. Anally I could feel each mark on the tube that indicated how far it was inserted. Out came the bullet, in went a lighted optical scope. Both surgeons took a quick peek and in went more lube. About that time someone arrived with some heavy canvass straps to tie me to the table right below the armpits. The straps really chaffed so someone found a couple of towels to cushion my armpits. Finally I could relax my arms without fearing a sudden 'unplanned insertion' of the pipe sticking out of my butt.
Then, we were off and running with a series of advances with the 'bullet' in place, each followed by pulling out the 'bullet' and squirting in another shot of lube. A couple of minor repositions of my body helped and within five minutes both Surgeons agreed that getting all but 5cm of the scope into my colon without any inflation was, "mission accomplished!"
In went the optical scope with it's light source. Slowly the scope was pulled out with the surgeons alternating glances through the scope, exchanging comments and taking taking notes. Again, I could sense each half-centimeter as the marks tweaked my outer sphincter.
Getting off the table I suggested that they use a standard parachute harness to secure the patient to the table instead of just a single strap uner the armpits. The guys on the 'afternoon shift' were put in a harness and got some support for their thighs.
Oh yeah, the procedure found no issues! Two years later I had my first Barium Enema (before the days of air contrast).