A hospital-grade basin holds water for washing patients, and converts easily/quickly for the patient's limb to rest across a portion of the basin. Half-moon shaped openings on opposite sides of the basin wall(s) support the limb at a reduced height with respect to adjacent side wall portions, which serve as a partial shield during wound irrigation. The shaped openings are sealed with hinged doors in a closed position, using a friction fit and/or elastomeric leaf-spring members. In another embodiment, opposing portions of the side wall may instead be formed of an over-molded elastomeric material that conforms to the patient's limb, or may have walls formed like a bellows. A one-time transformable basin has a wall with first and second notches to form first and second tear-away panels, which leave residual areas shaped and positioned on the wall according to first and second portions of a patient's limb.