The following was written by an Infection Prevention Consultant at a hospital in the U.K.
I am a urinary catheter,
Dark places I must go.
My job is clear,
I have no fear,
I have to ease the flow.
You are the one I am inside,
It enters not your head,
That if I'm left in
(a mortal sin)
You could just end up dead.
At times I am a useful aide,
My use you should not flout.
On every day,
Someone should say,
It's time to take me out!