Aortopulmonary anastomoses were created in 36 piglets to determine whether an encircling ring of heavy silk would limit excessive growth. When an unbanded anastomosis remained patent, it grew to a large size. When the anastomosis was banded by an encircling ring of heavy silk, growth was controlled in all but one pig.
Trusler GA, Kanzaki Y. Controlling the Growth ofAortopulmonary Anastomoses in Piglets. Arch Surg. 1973;106(1):72-74. doi:10.1001/archsurg.1973.01350130074016