Modelling crystal aggregation and deposition in the catheterised lower urinary tract

L. R. Band, L. J. Cummings, S. L. Waters, J. A.D. Wattis

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Urethral catheters often become encrusted with crystals of magnesium struvite and calcium phosphate. The encrustation can block the catheter, which can cause urine retention in the bladder and reflux into the kidneys. We develop a mathematical model to investigate crystal deposition on the catheter surface, modelling the bladder as a reservoir of fluid and the urethral catheter as a rigid channel. At a constant rate, fluid containing crystal particles of unit size enters the reservoir, and flows from the reservoir through the channel and out of the system. The crystal particles aggregate, which we model using Becker-Döring coagulation theory, and are advected through the channel, where they continue to aggregate and are deposited on the channel's walls. Inhibitor particles also enter the reservoir, and can bind to the crystals, preventing further aggregation and deposition. The crystal concentrations are spatially homogeneous in the reservoir, whereas the channel concentrations vary spatially as a result of advection, diffusion and deposition. We investigate the effect of inhibitor particles on the amount of deposition. For all parameter values, we find that crystals deposit along the full length of the channel, with maximum deposition close to the channel's entrance.

Original languageEnglish (US)
Pages (from-to)809-840
Number of pages32
JournalJournal of Mathematical Biology
Issue number6
StatePublished - Aug 2009

All Science Journal Classification (ASJC) codes

  • Modeling and Simulation
  • Agricultural and Biological Sciences (miscellaneous)
  • Applied Mathematics


  • Aggregation
  • Becker-Döring
  • Bladder
  • Blockage
  • Catheter
  • Deposition
  • Encrustation
  • Fluid flow
  • Mathematical modelling
  • Urethra


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