For the surgical treatment of porto caval or hepatic shunts. This special designed product is used to encircle a blood vessel. A special material (hygroscopic compressed casein) inside the donut shaped constrictor imbibes fluid over time. It slowly occludes the blood vessel. A small key is used to lock it in place after it is slipped over the blood vessel. Sizing: about a 50% reduction in the blood vessel diameter should be achieved upon initial surgical placement for the best results. Sterile.
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