Can someone say asher Yatzar for a sick, mute, hospitalized or any other person who has excreted but is unable to say the bracha himself? Does the person who excreted have to have any da'at or kavana or ability to understand what is being said or even the fact that a bracha is being done for him even if he doesn't understand what the bracha is or why it's being done?
This site discusses an interesting debate as to whether Asher Yatzar is considered Birkat Hanehenin, which posits that's only the one who receives benefit should recite it, or if it is a Birkat Hashevach which doesn't havethat requirement. The article has no sources to the debate. Additionally, it concludes "unless there is a case of great need", but it doesn't describe what fits that category, halachically.
I am assuming that the person saying the blessing has not relieved himself. This may address the "great need" mentioned in the above article. If the answer is "Yes, but only when the reciter has also relieved himself", why is that a requirement for this situation? Would it, then, make sense for that person to wait until he has also relieved himself in order to say the blessing for both?
If Asher Yatzar is considered a Birkat Shevach, this may delve into a general rule that someone who has no kavana or understanding of what the bracha is for may still have fulfilled his obligation by hearing someone else do the blessing.