Laparoscopic staplers are long and thin as compared to circular staplers. They may be manipulated to allow for access from a restricted number of trocar ports, and are used during end-to-side anastomosis. The staples are injected into the patient's body tissue, during what is considered a minimally invasive surgery. According to the U.S. National Library of Medicine, laparoscopic staples have been used successfully during liver resection. They are also used after the removal of a kidney due to cancer, and commonly used for gastroplasty surgery.