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An improved model for bacterial encrustation studies

S Sarangapani1, K Cavedon, D Gage

  • 1ICET, Inc., Norwood, Massachusetts 02062, USA.

Journal of Biomedical Materials Research
|October 1, 1995
PubMed
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This study developed a dynamic perfusion system to test biomaterials against bacterial colonization and encrustation in infected urine. Results show reproducible encrustation percentages for latex and hydrogel catheters, aiding urological biomaterial research.

Area of Science:

  • Urological biomaterials research
  • Medical device evaluation
  • Infectious disease research

Background:

  • Bacterial colonization and encrustation are significant issues with urinary catheters in infected urine.
  • Evaluating biomaterial resistance to these challenges is crucial for improving urological devices.
  • Existing methods may not accurately simulate in vivo conditions for comprehensive assessment.

Purpose of the Study:

  • To develop and validate an in vitro dynamic perfusion system for assessing biomaterial resistance to bacterial colonization and encrustation.
  • To compare the encrustation resistance of different biomaterials, specifically latex and hydrogel-coated catheters, under simulated infected urine conditions.
  • To address and rectify common issues like inlet clogging in such experimental setups.

Main Methods:

Related Experiment Videos

  • A dynamic perfusion system with four reactors, each holding six 1-inch catheter samples, was utilized.
  • Synthetic urine was perfused at a constant flow rate over 7 days, with Proteus mirabilis (a urease-producing pathogen) maintained at 10^6 CFU/mL.
  • pH, bacterial population, and encrustation percentage were monitored daily; temperature was precisely controlled at 37°C.

Main Results:

  • The system demonstrated reproducible encrustation percentages for latex (15.2 ± 3.65%) and hydrogel-coated (13.8 ± 2.58%) commercial catheter materials across three experimental runs.
  • The developed dismountable inlet assembly effectively resolved issues of inlet clogging caused by bacterial ascent or ammonia buildup.
  • Scanning electron microscopy provided visual data on the encrustation patterns on latex samples.

Conclusions:

  • The in vitro dynamic perfusion system provides a reliable and reproducible method for evaluating biomaterial resistance to bacterial colonization and encrustation in infected urine.
  • The system's design improvements, such as the dismountable inlet, enhance its utility for long-term studies.
  • This research contributes valuable data for the selection and development of improved urological biomaterials with enhanced resistance to encrustation.