Ureteral stents: coil strength and durometer
Abstract
OBJECTIVES: To evaluate the coil strength before and after urine exposure and the stiffness of commercially available double-J ureteral stents because both properties may affect stent performance and patient comfort.
METHODS: Twelve commercially available 6F ureteral stents were tested for coil strength before and after 30 days of urine exposure. The proximal end of each stent was inserted through a 2-mm hole in bologna, allowed to recoil, and then pulled using a handheld force gauge. Ten different commercially available ureteral stent models were tested for tensile strength using an MTS MicroBionix Testing System and Testworks II software and a 5 N load cell.
RESULTS: The Cook Black Silicone and Cook C-Flex stents had the strongest coil strengths before urine exposure at 0.480 +/- 0.0 lb (P < or = 0.0006) and were also the stents that had the greatest decrease in coil strength after urine exposure. After urine exposure, the weakest stent was the Applied Vertex stent at 0.088 +/- 0.008 lb (P < or = 0.02) and the strongest was the Cook Endo-Sof AQ at 0.223 +/- 0.014 lb (P < or = 0.03). Calculating the Young's modulus, E, the Cook C-Flex stent was the stiffest (E = 1472 +/- 196 KPa) and the Cook Black Silicone was the least stiff (E = 122 +/- 18 KPa). The stent models that demonstrated consistent E values across different lot numbers were the Circon Double J stent and Bard InLay.
CONCLUSIONS: Ureteral stents can be differentiated according to their coil strength and stiffness.…
Read the paper
Related studies
- A Survey on Knowledge Graphs: Representation, Acquisition, and Applications
- Toxicity of nanomaterials
- The Human Gene Mutation Database: towards a comprehensive repository of inherited mutation data for medical research, genetic diagnosis and next-generation sequencing studies
- Halogen bonding (X‐bonding): A biological perspective
- Biofilm formation at the air–liquid interface by the Pseudomonas fluorescens SBW25 wrinkly spreader requires an acetylated form of cellulose
- Opioid Activation of Toll-Like Receptor 4 Contributes to Drug Reinforcement
Go deeper in Evidence Hub
Evidence Hub adds a study data sheet (design, sample size, evidence level, key numbers), an AI summary and a chat grounded in the paper's text.