Patent ID: 6352522
Filing Date: 2002-03-05
Classification: A61M

Abstract:
In a disposable syringe having a plunger having one end telescopically disposed in an open end of a glass tube for manually-activated axial movement toward an axially opposed sealed end of the glass tube and a hollow needle having one end disposed to rupture the sealed end to release through the needle an injectable composition contained in the glass tube, and a removeable needle shield covering the other end of the needle, the improvement comprising:a seal element disposed on the one end of the plunger to force injectable composition toward the sealed end of the glass tube upon axial movement of the plunger; a grip element fixed to the open end of the glass tube, the grip element including an outwardly-projecting annular flange disposed for manual gripping during use of the syringe and an inwardly-projecting annular flange disposed to engage the seal element and prevent removal of the plunger from the glass tube; and a needle hub having a needle mount at one axial end and a chamber open at the other axial end, the needle mount holding the needle to fix the one end thereof in a predetermined position in the chamber and the chamber being disposed to slidably, coaxially receive the sealed end of the glass tube, the chamber including two axially-spaced, generally parallel, annular projections disposed to engage the sealed end of the glass tube in spaced, axial relation to the one end of the needle and, upon use of the syringe, to permit relative axial movement of the tube toward the needle mount to rupture the seal with the one end of the needle, the needle hub being the sole structural connection between the needle and the glass tube.