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To our knowledge baseline lithogenic risk factors in the morbidly obese population are currently unknown. Prior studies evaluated known stone formers and correlated risk with increasing body mass index. We describe risk factors for urinary stone formation in a group of unselected morbidly obese patients.Patients scheduled for gastric bypass provided a 24-hour urine collection before surgery. Patient...
Ureteroscopy has become a very effective treatment option for ureteral and upper tract abnormalities. The reported complication rates have ranged from 1.5% to 13% for perforations and have been less than 1% for avulsions. We present a study that quantified the ureteral avulsion force in porcine ureters and ureteral perforation forces in human and porcine ureters.The avulsion force was measured in...
Ureteral access sheaths (UAS) vary in their ability to resist buckling forces. We evaluated the forces utilized during simulated placement of a UAS. A model UAS (21F OD, 9F ID) was made of polyolefin material. Mounted to the distal tip of the catheter was a spring (7/32″ × 1″ × 0.28″ wire thickness). When simulating catheter insertion, the spring was placed in contact with an Extech™ 475040 Digital...
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