Method for rounding edges of openings in a tubular body and a product thereof

A method of treating a hole formed in a catheter, the method comprising:

• providing the catheter with an opening formed in a wall of the catheter from an external surface of the catheter to an internal surface of a lumen of the catheter such that the catheter has a sharp external edge formed between the external surface and the opening and a sharp internal edge formed between the opening and the internal surface of the lumen of the catheter, with the sharp internal edge having an angle formed in a range from 70 degrees to 120 degrees as measured between the opening and the internal surface of the lumen of the catheter;
• pushing a proximal end of a mandrel into the opening formed in the wall of the catheter and rounding the sharp external edge of the opening formed in the wall of the catheter with a distal end of the mandrel;
• and
• maintaining the sharp internal edge formed between the opening and the internal surface of the catheter.