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A continuous intravesical drug delivery system for the rat
1Department of Urology, University of Iowa Hospitals and Clinics, Iowa City.
The Journal of Urology
|March 1, 1991
Summary
This study presents a novel system for continuous drug delivery to the rat urinary bladder using a nephrostomy tube and osmotic pump. The model effectively delivered drugs without altering lower urinary tract histology.
Area of Science:
- Urology
- Pharmacology
- Surgical Models
Background:
- Continuous drug delivery systems are crucial for studying urinary tract conditions.
- Developing reliable animal models is essential for preclinical research.
Purpose of the Study:
- To describe and evaluate a novel, self-contained system for continuous drug infusion into the rat urinary bladder.
- To assess the efficacy and safety of this drug delivery model.
Main Methods:
- A reversible hydronephrosis model was created in rats.
- A nephrostomy tube was inserted into the kidney and connected to a subcutaneous osmotic pump.
- Methylene blue was used as a test agent to evaluate drug delivery and recovery over 14 days.
- Histological examination of renal and urothelial tissues was performed.
Main Results:
- The system achieved an average recovery of 102% of the delivered dose over 14 days.
- Renal histology showed inflammation at the nephrostomy tube site.
- No histological alterations were observed in the upper or lower urinary tract urothelium.
Conclusions:
- This model provides a viable method for continuous drug delivery to the rat urinary tract.
- The system demonstrates high drug recovery and no adverse histological effects on the lower urinary tract, making it suitable for research.