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Retractable sheath for hypodermic needle

  • US 5,415,645 A
  • Filed: 04/29/1994
  • Issued: 05/16/1995
  • Est. Priority Date: 04/29/1994
  • Status: Expired due to Fees
First Claim
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1. A retractable sheath assembly for a hypodermic needle, comprising:

  • a barrel adapted to be attached to a syringe of a hypodermic needle with the needle projecting axially from the barrel;

    an elongate, cylindrical sheath telescopically mounted relative to the barrel and slidably moveable from an extended position to cover the needle to a retracted position uncovering the needle;

    the sheath having an inner end portion and the barrel having a distal end portion;

    a cam formed on one of said barrel distal end portion and said sheath inner end portion;

    a cam follower formed on the other of said sheath inner end portion and said barrel distal end portion, the cam follower being adapted to engage the cam; and

    the cam having a first segment unblocking the cam follower and permitting retraction of the sheath to uncover the needle, a second segment blocking the cam follower and preventing retraction of the sheath to uncover the needle, and an intermediate segment for moving the cam follower between the first and second segments after retraction of the sheath to uncover the needle.

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