Abstract
In the present study, the aim is to develop a non-invasive measurement technique to diagnose patients having Bladder Outlet Obstruction(BOO). This is achieved by identifying major causes of the pressure loss in the lower urinary system by experimental and CFD methods. Computational fluid dynamics is used to compute the pressure distribution within the urinary system to determine the bladder pressure. This will help to diagnose the symptom of BOO.It is found that the pressure loss in the unobstructed case is due to the presence of friction. For slightly obstructed cases, the pressure losses are due to both the major (frictional) loss and the minor loss due to the change of geometry in the obstructed zone. As for the highly obstructed cases, the large proportion of the pressure loss is the minor loss resulting from the change of the geometry in the obstructed zone. A new set of dimensionless nomogram characterized by two parameters and Reynolds number is used to improve the deficiency of the AG number. Based on the newly proposed nomograph, patients both with obstructed and unobstructed cases can be diagnosed accurately. Also, those patients with weak detrusor, where the bladder can not provide enough power to micturate regularly, can also be identified with this new nomograph, which again can not be diagnosed with the Abrams-Griffiths nomogram.