The paracentesis safety needle has a blunt tip to help avoid puncture bowel during insertion. When pressure is applied to the tip, the ring turns red, and the blunt end retracts exposing the sharp end. This allows the needle to penetrate through skin and other tissues. When there is no pressure on the tip, the ring is green, and the blunt end is exposed. If this blunt end encounters bowel, it should just move out of the way.
The sharp needle can be removed leaving the catheter in place and this can be attached to the vacuum bottle’s tubing to perform large volume paracentesis. Don’t forget to give albumin if you’re removing more than 5-6 L of fluid.
Here’s another video from EMRAP TV.
patwari 
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