초록 ▼

A syringe barrel and hypodermic needle assembly includes a barrel portion having a chamber for retaining fluid and a portion extending from the distal end of the barrel portion having a passageway therethrough. A projection extends outwardly from the tip portion. A piercable barrier is provided for

A syringe barrel and hypodermic needle assembly includes a barrel portion having a chamber for retaining fluid and a portion extending from the distal end of the barrel portion having a passageway therethrough. A projection extends outwardly from the tip portion. A piercable barrier is provided for preventing fluid communication between the chamber and the passageway. A hub having a forward end, a rearward end and a conduit therethrough is movably positioned within the passageway. A first cannula extends outwardly from the forward end of the hub and a second cannula extends outwardly from the rearward end of the hub. A needle shield movably engaging the tip, covers the first cannula. This needle shield has an outer extension portion extending over a portion of the tip which is capable of contacting the projection for limiting the motion of the needle shield toward the proximal end of the barrel. The outer extension portion also includes a longitudinal groove which is wider than the projection and capable of receiving the projection. The needle shield also includes an inner extension portion projecting proximally into the passageway and capable of contacting the hub. The inner extension portion is long enough so than when the needle shield is rotated to align the groove and the projection, and moved in a proximal direction with respect to the tip so that the projection enters the groove, the inner extension pushes against the hub and moves the hub in a proximal direction causing the second cannula to pierce the piercable barrier.

대표청구항 ▼

An operable syringe barrel and hypodermic needle assembly comprising: an elongate barrel portion having an open proximal end and a chamber for retaining fluid; a tip portion extending from a distal end of said barrel portion having a passageway therethrough; a projection extending outwardly from sai

An operable syringe barrel and hypodermic needle assembly comprising: an elongate barrel portion having an open proximal end and a chamber for retaining fluid; a tip portion extending from a distal end of said barrel portion having a passageway therethrough; a projection extending outwardly from said tip portion; pierceable barrier means for preventing fluid communication between said chamber and said passageway; a rigid hub having a forward end, a rearward end and a conduit therethrough, said hub movably positioned within said passageway; a first cannula extending outwardly from said forward end of said hub and a second cannula extending outwardly from said rearward end of said hub, said first cannula and said second cannula being in fluid communication; an elongate hollow needle shield slidably engaging said tip covering said first cannula, said needle shield having an outer skirt portion extending over a portion of said tip, said outer skirt portion being capable of contacting said projection for limiting the motion of said needle shield toward the proximal end of said barrel, said outer skirt portion including a longitudinal groove being wider than said projection and capable of receiving said projection; and said needle shield having an inner skirt portion projecting proximally into said passageway and capable of contacting said hub, said inner skirt portion being long enough so that when said needle shield is rotated to align said groove and said protection, and moved in a proximal direction with respect to said tip portion so that said projection enters said groove, said inner skirt pushes against said hub and moves said hub in a proximal direction causing said second cannula to pierce said pierceable barrier means.