Use your WEB Browser's FIND or SEARCH feature to search the Forum's WEB page. There are lots of discussions about removing urine from concrete, hardwood floors, and I'm sure carpeting. Search using 'urine'.
Even though some of the mentioned products are not being discussed under 'carpeting', if you can find the product, it may be OK to use on carpeting. Just a thought. Urine, like any other liquid, will eventually find its way into the padding and under that. If what you apply doesn't work in due time, then it's a good bet that the urine is really 'in' something like the subfloor or whatever is underneath. IF that's the case, you may end up replacing the entire carpet. Just an FYI; some fixes are temporary.