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Research Abstracts Online
January 2009 - March 2010

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University of Minnesota Twin Cities
Institute of Technology
Department of Mechanical Engineering

PI: William K. Durfee

Design of an Axially Expandable Urinary Stent

It has been hypothesized that flank pain resulting from urinary stent placement is primarily due to the migration of the kidney. The human kidney migrates anywhere from 1-4 cm when a patient moves from a supine position to standing. Furthermore, the kidney also migrates during respiration, although not as significantly. This group is working on completing the design of an axially expandable urinary stent that is meant to stretch with the patient during respiration and other movements. The new design may significantly improve patient comfort when compared with other stents on the market.

The researchers have performed extensive finite element simulations using MSI’s resources. This work has shown the superiority of the group’s novel hole shape over elliptical or circular holes currently on the market. The current round of simulations is to determine how closely these holes may be patterned before the material begins to weaken or fail. This will allow the researchers to maximize elongation of the stent while minimizing the risk that it will break. Further work will be performed to model radial compression, and dynamic extension of the stent.

Group Member

David Goldman, Graduate Student