Materials and methods of using the same to improve structural integrity of a wall of a mammalian luminal organ. In an exemplary method of method for reinforcing a wall of a luminal organ, the method comprises the steps of inserting at least part of a needle into a blood vessel of a patient, advancing a distal end of the needle within the blood vessel to a location adjacent to a wall of a luminal organ of interest, piercing the wall of the luminal organ using the needle so that a tip of the needle is present within the wall of the luminal organ, injecting a substance through the needle and out of a distal portion of the needle so that at least some of the substance is present outside of the needle and inside of the wall of the luminal organ to reinforce the wall of the luminal organ.
