[A case of the foreign body due to "coring"]

A case of the foreign body due to coring from the rubbercap of a 50 ml Diprivan vial was reported. Furthermore, how the fragment is made and how to decrease the incidence are discussed. The incidence of coring should decrease by improvement of the needle and by sticking vials vertically. However, even if the improvement of the rubber, needles and sticking technique is achieved, the occurrence of coring can not be eliminated completely. The best way to avoid coring will be to furnish "50 ml syringes containing Diprivan" commercially.