Safety syringe having a combination needle cannula and articulating hub for retracting said cannula into a medication carpule
First Claim
1. A syringe including a cylinder having proximal and distal ends, said cylinder receiving a supply of fluid, and a hypodermic needle cannula extending outwardly from the distal end of said cylinder and communicating with the fluid supply thereof so that fluid may be injected from said cylinder via said cannula, said syringe also including:
- a carpule located at the interior of said cylinder and containing said supply of fluid, said needle cannula communicating fluidically with said carpule and the fluid therewithin, said carpule including a piston which is moved axially therethrough so that the fluid of said carpule is expulsed via said needle cannula in order to administer an injection;
a needle hub attached to said needle cannula and interfaced with said carpule at the distal end of said cylinder for retaining and supporting said cannula in fluid communication with said carpule; and
a lock connected to said carpule and having means by which to selectively engage said needle hub at the distal end of said cylinder, said lock being moved relative to said hub from a needle retaining position at which to engage said hub and thereby prevent the relocation of said cannula from the distal end of said cylinder to a needle releasing position at which to release the engagement of said hub and thereby permit the relocation of said cannula from said distal end.
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Accused Products
Abstract
A safety syringe, such as a dental syringe, comprising a hollow cylinder, a disposable, prefilled fluid medication carpule received within the interior of the cylinder, and a needle carrying hub supporting a needle cannula so that the cannula extends axially from the carpule and outwardly of the cylinder, whereby to administer an injection. A piston assembly is movable axially through the carpule to first expulse the medication therefrom and to then engage and retract the needle hub and its associated needle cannula into the carpule, so that the needle will be completely surrounded and shielded by said carpule. A slide lock is connected around one end of the medication carpule and interfaced with the needle carrying hub to control the relocation of the hub and corresponding retraction of the cannula through the carpule. The slide lock is selectively moved relative to the carpule between needle retaining and needle releasing positions to either anchor the needle carrying hub with the needle extending axially from the carpule for administering an injection or release the needle carrying hub for retracting the cannula into its carpule to permit a safe disposal of the needle while avoiding an accidental and potentially life threatening needle strike.
192 Citations
22 Claims
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1. A syringe including a cylinder having proximal and distal ends, said cylinder receiving a supply of fluid, and a hypodermic needle cannula extending outwardly from the distal end of said cylinder and communicating with the fluid supply thereof so that fluid may be injected from said cylinder via said cannula, said syringe also including:
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a carpule located at the interior of said cylinder and containing said supply of fluid, said needle cannula communicating fluidically with said carpule and the fluid therewithin, said carpule including a piston which is moved axially therethrough so that the fluid of said carpule is expulsed via said needle cannula in order to administer an injection; a needle hub attached to said needle cannula and interfaced with said carpule at the distal end of said cylinder for retaining and supporting said cannula in fluid communication with said carpule; and a lock connected to said carpule and having means by which to selectively engage said needle hub at the distal end of said cylinder, said lock being moved relative to said hub from a needle retaining position at which to engage said hub and thereby prevent the relocation of said cannula from the distal end of said cylinder to a needle releasing position at which to release the engagement of said hub and thereby permit the relocation of said cannula from said distal end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A syringe assembly including a cylinder having proximal and distal ends, said syringe assembly further including:
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a carpule located at the interior of said cylinder and containing a supply of fluid; a needle cannula communicating with the fluid supply of said carpule and extending outwardly from the distal end of said cylinder so that fluid from said carpule may be injected by way of said cannula; a needle hub attached to said needle cannula and received at the interior of said carpule for retaining said cannula in fluid communication with said carpule; means by which to engage said needle hub and to relocate said hub, and the needle cannula to which said hub is attached, axially and proximally through said carpule so that said cannula is retracted within and completely surrounded by said carpule; and locking means by which to selectively engage said needle hub at the distal end of said cylinder, said locking means being moved relative to said hub from a needle retaining position at which to engage said hub and thereby prevent a proximal relocation of said hub and a retraction of said cannula to a needle releasing position at which to release the engagement of said hub and thereby permit a proximal relocation of said hub and a retraction of said cannula. - View Dependent Claims (17, 18, 19, 20)
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21. A syringe including a cylinder having proximal and distal ends, said cylinder receiving a supply of fluid, and a hypodermic needle cannula extending outwardly from the distal end of said cylinder and communicating with the fluid supply thereof so that fluid may be injected from said cylinder via said cannula, said syringe also including:
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a carpule located at the interior of said cylinder and containing said supply of fluid, said needle cannula communicating fluidically with said carpule and the fluid therewithin, said carpule including a piston which is moved axially therethrough so that the fluid of said carpule is expulsed via said needle cannula in order to administer an injection; a needle hub attached to said needle cannula at the distal end of said cylinder for retaining and supporting said cannula in fluid communication with said carpule, said needle hub located within and movable axially through said carpule; and a lock connected to said carpule and slidable across one end thereof, said lock having means by which to selectively engage said needle hub at the distal end of said cylinder, said lock being moved relative to said hub from a needle retaining position, at which to engage said hub and thereby prevent both the axial movement of said hub from the distal end of said cylinder and the relocation of said cannula through said carpule, to a needle releasing position, at which to release the engagement of said hub and thereby permit the axial movement of said hub and the relocation of said cannula through said carpule.
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22. A syringe assembly including a cylinder having proximal and distal ends, said syringe assembly further including:
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a carpule located at the interior of said cylinder and containing a supply of fluid; a needle cannula communicating with the fluid supply of said carpule and extending outwardly from the distal end of said cylinder so that fluid from said carpule may be injected by way of said cannula; a needle hub attached to said needle cannula and received at the interior of said carpule for retaining said cannula in fluid communication with said carpule; means by which to engage said needle hub and to relocate said hub, and the needle cannula to which said hub is attached, axially and proximally through said carpule so that said cannula is retracted within and completely surrounded by said carpule; and locking means connected to said carpule to selectively engage said needle hub at the distal end of said cylinder to control the relocation of said hub and the retraction of said cannula, said locking means being moved relative to said hub from a needle retaining position at which to engage said hub and thereby prevent a proximal relocation of said hub and a retraction of said cannula to a needle releasing position at which to release the engagement of said hub and thereby permit a proximal relocation of said hub and a retraction of said cannula.
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Specification