This is most likely from the late 1970s, but it's possible it could have been on TV as late as 1981. This was a made-for-TV movie that might have even been a pilot for a series in the U.S. (If it made it to being a series, I never saw the series.)
In this story, a man loses the use of his legs. I think he's shot by someone. He startes experimenting and working with a metal that can bend or change shape. (I think he uses electric current to control the metal.) He makes a suit out of the material, with a dark visor over his face to hide his identity. He had a machine in the back of a van so he could lift himself into the machine, lie down, and the top would lower onto him and then he could emerge in his suit, which let him walk.
There was some kind of limitation to the suit. I think it was that the power supply could only last for a short time. In one scene, the suit runs out of power and he falls down just before the commercial break. After the break, a kid sees him and opens the visor before he suffocates from lack of air in the suit.
While it's not a big deal, it's one of those niggling memories so I'd like to be able to find out what the title was so I could look it up and read the synopsis about what happened in the movie.