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Needle shield for disposable syringe with annular ring

  • US 9,474,865 B2
  • Filed: 04/25/2013
  • Issued: 10/25/2016
  • Est. Priority Date: 04/25/2013
  • Status: Active Grant
First Claim
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1. A needle safety system comprising:

  • a syringe having a barrel, a needle having a sharp end arranged at a distal end of the barrel, and a generally annular ring proximate the distal end of the barrel and extending radially outwardly from the barrel; and

    a needle shield comprising;

    a body extending between a distal end and a proximal end along a longitudinal axis, the body having a longitudinal channel formed therein and being configured to receive the syringe such that the body partially surrounds the barrel of the syringe, the body and the syringe being movable with respect to each other between a first position wherein the sharp end of the needle extends distally beyond the distal end of the body and a second position wherein the distal end of the body extends distally beyond the sharp end of the needle;

    a longitudinal opening formed in the body and extending from the distal end to the proximal end of the body, the longitudinal opening accessing the longitudinal channel;

    a first latching mechanism disposed longitudinally along the body proximate a distal end of the body, the first latching mechanism being radially outwardly deflectable and including a protuberance at a distal end thereof that extends radially into the longitudinal channel when the first latching mechanism is in a first rest position; and

    a second latching mechanism disposed longitudinally along the body and proximally with respect to the first latching mechanism, the second latching mechanism being radially outwardly deflectable and including a tab at a proximal end thereof that extends radially into the longitudinal channel when the second latching mechanism is in a second rest position, the tab having a radially inwardly tapering portion toward a proximal edge of the tab oriented generally perpendicularly with respect to the longitudinal axis,wherein during movement of the syringe and needle shield from the first position to the second position the annular ring of the syringe is configured to;

    (i) contact the protuberance and outwardly deflect the first latching mechanism to allow the annular ring to pass the protuberance in a proximal direction, and(ii) contact the tab and outwardly deflect the second latching mechanism to allow the annular ring to pass the tab in a proximal direction such that after the annular ring passes the tab and the second latching mechanism returns to the second rest position, the proximal edge of the tab is in facing engagement with the annular ring and prevents proximal movement of the body relative to the syringe.

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