[On the Ruling of Prayer for One Bearing a Urine Bag]

Answer: The scholars of the madhhab, as mentioned in the marginal notes of Sharḥ al-Azhār, stated: “If one were to devise an apparatus to collect urine, his prayer would not be valid, for he is carrying an impurity. He is not obligated to bind or to stuff it.” End quote.
I say: The stronger view is that the prayer of such a man carrying a pouch collecting urine is valid, due to the necessity of his condition. What is obligatory upon the mukallaf is to minimize impurity to the extent possible, in light of Allah’s saying: “So fear Allah as much as you are able.” — [al-Taghābun 64:16] and the ḥadīth: “When I command you with a matter, do of it as much as you are able.”
If the patient were to abandon the pouch and allow the tubes to leak over his thigh, the impurity would spread to his body and clothes far more than by carrying the pouch wherein the urine is contained.