A staple line leak is an internal leak or opening that can occur along any of the staple lines of a Roux En Y Gastric Bypass or a Sleeve Gastrectomy. The risk of developing a leak in a Roux En Y Gastric Bypass is approximately 1%. The risk of developing a leak in a Sleeve Gastrectomy is approximately 0.5%. A leak may result in needing more surgeries, revisions, and prolonged hospitalization with rehabilitation.