Syringe assembly
First Claim
1. A hypodermic syringe assembly comprising:
- an elongate barrel having an open proximal end, a chamber for retaining fluid and a tip portion extending from a distal end of said barrel having a passageway therethrough communicating with said chamber;
a needle cannula having a distal end extending outwardly from said tip portion including a lumen therethrough in fluid communication with said passageway;
a needle shield assembly including a resilient needle sheath having an open proximal end, a closed distal end, a sidewall defining a receptacle therein and an annular flange extending radially outwardly from said proximal end, said resilient needle sheath being positioned within an elongate rigid needle shield having a continuous open proximal end, a distal end and a sidewall therebetween defining a needle shield longitudinal axis;
means for holding said sheath within said shield so that said sheath cannot be removed from said shield during normal use of said syringe assembly, said holding means including a flange receiving aperture in said needle shield sidewall adjacent to said open proximal end, said aperture having a ledge on the proximal side of said aperture for engaging the proximal side of said flange for holding said sheath in said shield, said holding means also including deflecting means for contacting and deflecting said annular flange causing more of said annular flange to project into said flange receiving aperture than if said deflecting means were not included;
said sheath including cannula sealing means at said distal end of said receptacle for providing a fluid-tight seal between said lumen and the environment of said syringe assembly;
said needle shield assembly being positioned with said distal end of said cannula engaging said cannula sealing means and said proximal end of said sheath removably engaging said tip portion to hold said shield assembly on said barrel while simultaneously sealing said lumen of said cannula so that said sheath surrounds the entire portion of said cannula which extends outwardly from said tip portion; and
said needle shield assembly being easily engageable to and removable from said barrel and said cannula using manual force applied to said shield.
1 Assignment
0 Petitions
Accused Products
Abstract
A syringe assembly includes a barrel having an open proximal end, a chamber for retaining fluid and a tip portion extending from a distal end of the barrel having a passageway therethrough communicating with the chamber. A needle cannula having a distal end extends outwardly from the tip portion and includes a lumen in fluid communication with the passageway. A needle shield assembly includes a resilient needle sheath having an open proximal end, a closed distal end, a sidewall defining a receptacle therein and an annular flange extending radially outwardly from the proximal end of the needle sheath. The needle sheath is positioned within an elongate rigid shield having an open proximal end, a distal end and a sidewall therebetween. Structure for holding the sheath within the shield includes a flange-receiving aperture in the needle shield sidewall adjacent to the open proximal end. The aperture includes a ledge on its proximal side for engaging the proximal side of the flange for holding the sheath in the shield. Structure is also provided for deflecting the annular flange causing more of the annular flange to project into the flange-receiving aperture than if the structure were not included. The needle shield assembly is positioned with the distal end of the cannula engaging the cannula sealing distal end of the sheath and the proximal end of the sheath removably engages the tip portion of the barrel to hold the shield assembly on the barrel while simutaneously sealing the lumen of the cannula.
109 Citations
21 Claims
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1. A hypodermic syringe assembly comprising:
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an elongate barrel having an open proximal end, a chamber for retaining fluid and a tip portion extending from a distal end of said barrel having a passageway therethrough communicating with said chamber; a needle cannula having a distal end extending outwardly from said tip portion including a lumen therethrough in fluid communication with said passageway; a needle shield assembly including a resilient needle sheath having an open proximal end, a closed distal end, a sidewall defining a receptacle therein and an annular flange extending radially outwardly from said proximal end, said resilient needle sheath being positioned within an elongate rigid needle shield having a continuous open proximal end, a distal end and a sidewall therebetween defining a needle shield longitudinal axis; means for holding said sheath within said shield so that said sheath cannot be removed from said shield during normal use of said syringe assembly, said holding means including a flange receiving aperture in said needle shield sidewall adjacent to said open proximal end, said aperture having a ledge on the proximal side of said aperture for engaging the proximal side of said flange for holding said sheath in said shield, said holding means also including deflecting means for contacting and deflecting said annular flange causing more of said annular flange to project into said flange receiving aperture than if said deflecting means were not included; said sheath including cannula sealing means at said distal end of said receptacle for providing a fluid-tight seal between said lumen and the environment of said syringe assembly; said needle shield assembly being positioned with said distal end of said cannula engaging said cannula sealing means and said proximal end of said sheath removably engaging said tip portion to hold said shield assembly on said barrel while simultaneously sealing said lumen of said cannula so that said sheath surrounds the entire portion of said cannula which extends outwardly from said tip portion; and said needle shield assembly being easily engageable to and removable from said barrel and said cannula using manual force applied to said shield. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A hypodermic syringe assembly comprising:
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an elongate barrel having an open proximal end, a chamber for retaining fluid and a tip portion extending from a distal end of said barrel having a passageway therethrough communicating with said chamber; a needle cannula having a distal end extending outwardly from said tip portion including a lumen therethrough in fluid communication with said passageway; a needle shield assembly including a resilient needle sheath having an open proximal end, a closed distal end, a sidewall defining a receptacle therein, and an annular flange extending radially outwardly from said proximal end, said resilient needle sheath being positioned within an elongate rigid needle shield having a continuous open proximal end, a distal end and a sidewall therebetween defining a needle shield longitudinal axis; means for holding said sheath within said shield so that said sheath cannot be removed from said shield during normal use of said syringe assembly, said holding means including a plurality of flange receiving apertures in said needle shield sidewall adjacent to said open proximal end, each of said apertures having a ledge on the proximal side of said aperture for engaging the proximal side of said flange for holding said sheath in said shield, said holding means also including deflecting means for contacting and deflecting said annular flange causing more of said annular flange to project into said flange receiving apertures than if said deflecting means were not included, said means for contacting and deflecting said flange including a plurality of inwardly projecting protuberances on said sidewall positioned adjacent to said proximal end of said needle shield and between said apertures, said sheath including cannula sealing means at said distal end of said receptacle for providing a fluid-tight seal between said lumen and the environment of said syringe assembly; said needle shield assembly being positioned with said distal end of said cannula engaging said cannula sealing means and said proximal end of said sheath removably engaging said tip portion to hold said shield assembly on said barrel while simultaneously sealing said lumen of said cannula so that said sheath surrounds the entire portion of said cannula which extends outwardly from said tip portion; said shield and said sheath being structured so that said shield can be manually assembled to said sheath while said sheath is properly positioned sealing said cannula and engaging said tip portion of said barrel; and said needle shield assembly being easily engageable to and removable from said barrel and said cannula using manual force applied to said shield. - View Dependent Claims (21)
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Specification