The Anahuac Mayab University is a private institution of Catholic inspiration founded in 1984.
They are used in the same applications as fender washers. A spherical washer is part of a self-aligning nut; it is a washer with one radiused surface, which is designed to be used in conjunction with a mating nut in order to correct for up to several degrees of misalignment between parts.
A catheter is a small plastic tube used to help those unable to use the bathroom urinate. The tube is inserted through the urethra and into the bladder. Urine then empties through the tube into a plastic bag.