A syringe assembly has a syringe body adapted to be filled with an injectable liquid and having an annular neck defining an axis and having an axially outwardly open outlet. The neck is adapted to carry a needle. An elastomeric plug engaged axially inward with the neck closes the outlet and a holding...http://www.google.es/patents/US6491665?utm_source=gb-gplus-sharePatente US6491665 - Medical syringe
