In South Africa, the medical devices are regulated by Radiation Control of the South African Department. Definitely you can import medical devices here, but you need to take permission of regulatory authority. Also it is advisable that the product you are going to import must be FDA approved or even better to have the EC marks. However, I believe instead of importing medical devices from other place, why not you try medical device supplier like ilexmedical.com etc. which are already present there and have big stock of medical equipment. It will not only save your time, but saves money and avoid lots of fuss too. However, choice is all yours; choose the one which suits you best.