Male catheterisation can be difficult to perform, especially in patients with an enlarged prostate gland or other potentially obstructive conditions in the lower urinary tract. Repeated and unsuccessful catheterisations, as well as causing trauma, pain and distress, can cause other conditions such as urethral strictures and 'false passages' (when the catheter is pushed through the urethral wall instead of passing down the urethra), which then require more costly interventions to correct.