Syringe having needle isolation features
First Claim
1. A hypodermic syringe having a syringe barrel with opposed proximal and distal ends and a fluid-receiving chamber therebetween, a passage extending through said distal end for communication with said chamber, and a pierceable barrier for blocking fluid flow through said passage, a needle cannula mounted to said distal end of said syringe barrel and being selectively movable in a proximal direction for piercing said barrier, a needle shield mounted to said syringe barrel for covering said needle cannula, said syringe including an activation assembly comprising:
- first and second cooperating cam means disposed respectively on said syringe barrel and said needle shield, said cam means being responsive to unidirectional rotation of said needle shield relative to said syringe barrel for initially moving said needle shield and said needle cannula in said proximal direction sufficiently for piercing said barrier and for subsequently moving said needle shield in a distal direction for separating said needle shield from said syringe barrel.
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Accused Products
Abstract
A hypodermic syringe has a syringe barrel with a distal end and a passage therethrough communicating with a fluid-receiving chamber in the syringe barrel. A barrier extends across the passage to isolate the fluid in the chamber. A needle cannula is mounted to a needle hub slidingly engaged at the distal end of the syringe barrel. The needle cannula includes a proximally facing point for piercing the barrier in the passage to the chamber of the syringe barrel. A needle shield is mounted to the distal end of the syringe barrel, and cam means are provided for cam-guided rotational movement between the needle shield and the syringe barrel. The cam shape causes the needle shield and the needle cannula to move proximally for initially piercing the barrier and then to move distally to enable separation of the needle shield.
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Citations
19 Claims
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1. A hypodermic syringe having a syringe barrel with opposed proximal and distal ends and a fluid-receiving chamber therebetween, a passage extending through said distal end for communication with said chamber, and a pierceable barrier for blocking fluid flow through said passage, a needle cannula mounted to said distal end of said syringe barrel and being selectively movable in a proximal direction for piercing said barrier, a needle shield mounted to said syringe barrel for covering said needle cannula, said syringe including an activation assembly comprising:
first and second cooperating cam means disposed respectively on said syringe barrel and said needle shield, said cam means being responsive to unidirectional rotation of said needle shield relative to said syringe barrel for initially moving said needle shield and said needle cannula in said proximal direction sufficiently for piercing said barrier and for subsequently moving said needle shield in a distal direction for separating said needle shield from said syringe barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A hypodermic syringe comprising:
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a syringe barrel with opposed proximal and distal ends and a fluid-receiving chamber therebetween, as passage extending through said distal end for communication with said chamber and a pierceable barrier blocking fluid flow through said passage; a needle hub mounted to said distal end of said syringe barrel external of said barrier and being selectively moveable in a proximal direction; a needle cannula fixedly mounted to said needle hub for movement therewith and having a proximally facing point aligned with said barrier for piercing said barrier in response to said proximal movement of said hub; a needle shield rotatably and axially moveable on said distal end of said syringe barrel for protectively covering said needle cannula; and first and second cam means disposed respectively on said syringe barrel and said needle shield, said cam means being configured such that continuous rotation of said needle shield relative to said syringe barrel generates an initial movement of said needle shield in a proximal direction for urging said hub and said needle cannula proximally a sufficient distance for piercing said barrier and for subsequently generating movement of said needle shield in a distal direction in response to said continuous rotation for separating said needle shield from said syringe barrel. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A hypodermic syringe comprising:
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a syringe barrel with opposed proximal and distal ends and a fluid-receiving chamber therebetween a tip disposed at said distal end and having a passage therethrough for communication with said chamber, a pierceable barrier in said syringe barrel for blocking fluid flow through said passage, a generally cylindrical collar disposed around said tip in spaced concentric relationship thereto, said collar having an outer surface with at least one cam slot formed therein, said cam slot extending from a start position spaced generally helically in a proximal direction from said distal end to an activated position and extending from said activated position generally helically to said distal end of said syringe barrel; a needle hub mounted for sliding telescoped movement within said cylindrical collar; a needle cannula fixedly mounted to said needle hub and disposed external of said barrier, said needle cannula including a proximally facing point aligned for piercing said barrier in response to said proximal movement of said hub; and a needle shield mounted to said collar for axial and rotational movement thereon, said needle shield being configured for protectively enclosing said needle cannula, said needle shield comprising an inner surface having at least one cam pin formed thereon for sliding cam-guided movement in said cam slot of said collar and a proximally facing surface for engagement with said needle hub, whereby rotation of said needle shield relative to said syringe barrel causes said cam pin to follow said cam slot and initially urges said needle shield and said needle hub in said proximal direction such that said needle cannula pierces said barrier and subsequently urges said needle shield in a distal direction for removal of said needle shield from said syringe barrel.
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Specification