JML is a good company. respectable, i know of its founder.
look at theirs.
i bought one in john lewis about 5 years ago for a lady with arthritis. it was quite pricey, about £24 then, but seemed to work well. battery operated. looks a bit like a large matt black beetle. it travels round the rim of the can, cutting as it goes. then you press something to detach the cutting edge and lift the lid off by magnet.
i haven't seen the JML one, as i needed one i could obtain there and then, not mail order.
good luck. don't struggle and strain needlessly.
To go through chemo therapy or choose not to?