In this study we will test the effect of local intraureteric aminophylline instillation through Ureteric stent and Reaching stone without the need of ballon dilataion
The study will include patients with failed stone accessibility by semi-rigid ureteroscopy.
Child age group
Pre stented patients
Contraindications to aminophylline (hypersensitivity to drug components, pregnancy or lactation ,…)
Contraindications to ureteroscopy (active urinary tract infection - Contraindications to general or spinal anesthesia - Uncorrected bleeding disorders)