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In vitro results with special plastics for biodegradable endoureteral stents
1Department of Urology and Pediatric Urology, Fulda Medical School, Philipps-University of Marburg, Germany.
Journal of Endourology
|December 10, 1998
Summary
Researchers developed new biodegradable ureteral stents that dissolve in alkaline urine. These novel stents avoid endoscopic removal, offering a more convenient solution for temporary urinary diversion.
Area of Science:
- Biomaterials Science
- Urology
- Chemical Engineering
Background:
- Internal ureteral stents, commonly double-J catheters, require endoscopic removal, causing patient inconvenience and additional medical procedures.
- Current stent materials lack a mechanism for self-removal, posing a challenge in temporary urinary diversion applications.
Purpose of the Study:
- To develop and evaluate novel biodegradable (biodissolvable) endoureteral stents.
- To create a stent that remains functional yet can be dissolved by altering the urinary environment's pH.
Main Methods:
- Tested two polymer materials (G100X-15xLB and G100X-20xLB) in artificial urine under varying pH conditions.
- Conducted solution trials to assess material integrity over 60 days.
- Utilized a ureter model with an infusion pump to simulate urine flow and evaluate stent dissolution and fragment obstruction.
Main Results:
- Materials remained stable in acidic artificial urine (pH 5.2) for over 30 days.
- Complete dissolution occurred in alkaline artificial urine (pH 7.9) within 20 hours in the ureter model.
- No obstruction was observed in the ureter model, with materials breaking into microscopic fragments.
Conclusions:
- The tested polymers are suitable for developing pH-responsive, biodegradable endoureteral stents.
- Dissolution of these novel stents can be controlled by manipulating urinary pH.
- This innovation offers a potential alternative to endoscopic stent removal.