Abstract: An anti-refluxive internal ureteral stent includes a ureteral catheter which is closed at its renal end and is provided with lateral perforations only in the upper and middle portions thereof. The stent includes a hood-valve at it vesical end to prevent urinary reflux. The hood-valve comprises a hood-shaped plastic foil that partially surrounds the external circumferential surface of the catheter at the oblique vesical end opening. The hood-valve is open in its resting state so as to allow the urine to flow out through the vesical outlet, unimpeded by the hood-valve, and folds over to close the vesical outlet in response to a reflux pressure generated due to a pressure differential between the catheter and the bladder. The valve remains closed until the pressure differential subsides. The urine flows into the catheter via multiple lateral openings in the upper and middle portions thereof.