Three recent cases of downward migration of soft double-coil silicone ureteral catheters prompted us to switch to a new configuration of the proximal portion of the stent. A case report of downward migration of a ureteral catheter despite this new figure-4 configuration is presented. Downward migration may be more dependent on the stent's stiffness than on its configuration. Historical development of ureteral stents is reviewed.
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Pryor et al. (1988) studied this question.
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