Is it permissible for a man who prayed Fajr, and while undergoing dialysis, the Dhuhr and Asr prayers became due, to pray Dhuhr during the procedure with his previous ablution?

If the time for prayer arrives, it is permissible for a Muslim to pray in their current state according to their ability, due to the Almighty's saying: (So fear Allah as much as you are able), and due to the Prophet's (peace be upon him) saying: "If I command you to do something, then do of it as much as you are able." If the worshiper is unable to stand, he should pray sitting; if he is unable to do so, then on his side. One must hasten to pray according to their ability if they fear the time will expire.