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Hypodermic syringe with protective shield

  • US 5,222,945 A
  • Filed: 10/13/1992
  • Issued: 06/29/1993
  • Est. Priority Date: 10/13/1992
  • Status: Expired due to Fees
First Claim
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1. A safety syringe comprising:

  • (a) a barrel having an interior chamber for containing a fluid and at least one longitudinally extending guide channel;

    (b) a needle mounted to the barrel at one end of the barrel, said needle having a bore in fluid communication with the interior chamber in the barrel;

    (c) a plunger slidably mounted within the interior chamber of the barrel for displacing the fluid within the barrel through the needle to administer fluid to a patient;

    (d) a protective shield slidably mounted on the barrel and movable between an extended position in which the needle is concealed and a retracted position in which the needle is exposed;

    (e) a key secured to the protective shield which fits into the guide channel of the barrel to guide the movement of the protective shield between the extended and retracted positions, said key including a plurality of serrations;

    (f) means for releasably locking the protective shield in a first, extended position prior to the syringe being used;

    (g) means for releasably locking the protective shield in a second retracted position to facilitate use of the syringe; and

    (h) means for irreversibly locking the protective shield in a third extended position after the syringe has been used to prevent reuse of the syringe, said irreversible locking means including a plurality of serrations formed on the barrel of the syringe which are engageable with the serrations on the key of the protective shield to irreversibly lock the protective shield in the third position.

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