Straight suture needles are often used to secure arterial and venous catheters to the skin. Straight suture needles are These needles have been demonstrated to be more dangerous than curved or blunt suture needles, with up to seven times higher rate of injury for health care workers. By utilizing the plastic needle sheath present in most central venous line kits as a "thimble," counter pressure and skin puncture may be achieved without bringing the fingers near the sharp end of the suture.

Reference:
Nelson BP. Making straight suture needles a little safer: a technique to keep fingers from harm's way. J Emerg Med. 2008 Feb; 34(2):195-7. Epub 2007 Oct 1.

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