A surgical buttress for use in a surgical stapling apparatus is provided. The surgical buttress includes an elongate rectangular body portion defining a width； a nose portion integrally formed with and extending from a distal end of the body portion, the nose portion defining a width that is less than the width of the body portion； a neck portion integrally formed with and extending from a distal end of the nose portion, the neck portion defining a width； a head portion integrally formed with and connected to a distal end of the neck portion, the head portion defining a width； and a tail portion integrally formed with and extending from a proximal end of the body portion, the tail portion defining a width that is less than the width of the body portion. The surgical buttress is formed from a material having filaments. The surgical buttress include radioactive material.
