Mechanical Evaluation of a Ruptured Swedish Adjustable Gastric Band

Background: Leakage of a laparoscopically placed Swedish adjustable gastric band (SAGB) was observed 2 1/2 years after placement. The band was evaluated for mechanical inaccuracies by a laboratory. Methods: The ruptured SAGB was investigated microscopically and wall thicknesses were measured. An unused SAGB was tested, both empty and filled, for mechanical deformity after exposure to saline solution. Results: A permanent transformation of the silicone rubber was found, caused by bowing of the device. 2 tears were present at the end of a kink.The mean wall thickness was within acceptable limits. Exposure of the gastric band to saline solution did not cause any sign of permanent deformity of the silicone rubber. Conclusion:The rupture of the gastric band did not seem to be caused by a production error. Long-term deformity, in combination with a continuous dynamic load, may increase the risk of tearing. Long-term follow up is recommended for patients treated with this device.