How does a person perform Salaat, if he/she is restricted to a bed, and answering the call of nature using a bedpan, where there is a good possibility of impurity clinging to their self or clothes.

1. Patients that are bed-ridden normally have people attending to their needs and assisting them in such a situation. It is possible for them to assist them with Salaat preparation. In the unlikely event of having nobody to assist them at all or do having somebody but such a person before whom one is not allowed to expose his Satar (private parts), i.e. below the navel to below the knee for male, then in such a compelling situation, the patient is allowed to read the Salaat with the impurity on and the Salaat will not have to be repeated.
2. Wudhu will have to be made for the Salaat. However, if due to the nature of his illness he cannot make Wudhu, or he cannot reach the water at all and there is nobody at all to assist him, then he may perform Tayammum. (Tahtaawi pg.129)

Procedure for Tayammum
1. Niyyat. I am making Tayammum for Wudhu/Ghusl.
2. Strike both hands on earth and dust, thereafter, rub on face. 3. Strike for second time and rub both forearms including elbows. Kindly read authentic Kitaabs on Tayammum for more information.

and Allah Ta'ala Knows Best

Mufti Ebrahim Desai