Catheters: Dufour, Couvelaire or Mercier, with a 50-80ml balloon. TURP is now the most common surgery used to remove part of an enlarged prostate. Open prostatectomies (in which an incision is made in the abdomen) are generally required only when the prostate is very enlarged. Following surgery, a catheter is used to remove blood or blood clots in the bladder, which may result from the procedure. When the urine is free of significant bleeding or blood clots, the catheter can be removed and the patient may go home.