Syringe needle guard
First Claim
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1. A protected needle assembly for a hypodermic syringe comprising:
- a standard needle assembly hub having upper and lower sections,means on said hub for connecting the assembly to a syringe barrel,a cannula fixed to said lower section and having an insertion tip positioned outwardly of said lower section, anda longitudinally extensible and collapsible protective sleeve having an inner end fixedly secured to and circumscribing said hub upper section and having an outer end radially outwardly spaced from said hub lower section and extending to said cannula insertion tip when said sleeve is longitudinally extended, said sleeve being longitudinally collapsible to a contracted position in which said sleeve outer end is positioned inwardly of said cannula tip to expose the cannula tip for use of the syringe.
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Abstract
A telescoping guard for a hypodermic syringe needle assembly has an inner section that is securely connected to the upper section of a standard needle assembly hub. The guard can be telescopically extended to afford full protection for the cannula of the needle assembly, and can be contracted to clear the cannula for use without any interference with the syringe barrel. The guard allows use of a standard cannula cap on the standard needle assembly.
139 Citations
15 Claims
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1. A protected needle assembly for a hypodermic syringe comprising:
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a standard needle assembly hub having upper and lower sections, means on said hub for connecting the assembly to a syringe barrel, a cannula fixed to said lower section and having an insertion tip positioned outwardly of said lower section, and a longitudinally extensible and collapsible protective sleeve having an inner end fixedly secured to and circumscribing said hub upper section and having an outer end radially outwardly spaced from said hub lower section and extending to said cannula insertion tip when said sleeve is longitudinally extended, said sleeve being longitudinally collapsible to a contracted position in which said sleeve outer end is positioned inwardly of said cannula tip to expose the cannula tip for use of the syringe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A hypodermic syringe comprising:
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a syringe barrel, a needle connecting fitting having an externally tapered neck secured to an end of said barrel, and a guarded needle assembly secured to said fitting, said guarded needle assembly comprising; a hub and a cannula secured to the hub, said hub having a bore that is a tight friction fit on said connecting fitting neck, and a longitudinally extensible and contractible guard sleeve secured to said hub, said guard sleeve being movable between a contracted position in which a major portion of the cannula is free of and extends beyond the guard sleeve, and an extended position in which the guard sleeve extends to the end of the cannula, said barrel including an internally threaded tip sleeve radially spaced from and circumscribing said needle connecting fitting, said guard sleeve including an inner section connected to said needle hub, said inner section having outwardly projecting teeth in threaded engagement with said internally threaded tip sleeve. - View Dependent Claims (10, 11, 12, 13)
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14. A protected needle assembly for a hypodermic syringe comprising:
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a standard needle assembly having a needle hub of standard configuration, said hub having an upper section of a first external diameter and a lower section of a second external diameter smaller than said first diameter, said hub having a tapered internal bore, a cannula secured to the hub in communication with the bore, a radially outwardly projecting circumferential flange on said upper section, said flange having first and second oppositely disposed projections adapted to threadedly engage the threaded sleeve of a syringe leur tip, and a multi-section telescopic guard sleeve comprising; an inner guard sleeve section having an inner diameter greater than the external diameter of said lower hub section, said inner guard sleeve section having an upper connecting portion with an internal diameter substantially equal to the external diameter of said hub upper section, said connecting portion being a tight friction fit upon said upper hub section, and said inner guard section being radially spaced from said lower hub section to form an annular space there between, a second guard sleeve section slidably and telescopically connected to said inner section, a third guard sleeve section slidably and telescopically connected to said second guard sleeve section, said guard sleeve sections being telescopically movable between a contracted position in which all of said guard sleeve sections are positioned adjacent said hub and inwardly of a major portion of said cannula, and an extended position in which the outermost one of said guard sleeve sections extends to a protective position around the end of said cannula, and a cannula guard having an enlarged open end connected to the lower section of said hub and positioned between said lower section and said inner guard sleeve section. - View Dependent Claims (15)
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Specification