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Safety shield system for a syringe

  • US 7,497,847 B2
  • Filed: 11/03/2003
  • Issued: 03/03/2009
  • Est. Priority Date: 11/03/2003
  • Status: Active Grant
First Claim
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1. A medical device for delivering a medicament to a patient, comprising:

  • a syringe assembly comprising;

    a barrel having a forward end and a rear end and defining a reservoir within which the medicament may be contained;

    a needle cannula having a forward tip and being coupled to said forward end of said barrel and in fluid communication with said reservoir; and

    a plunger having a first end with a stopper positioned in said reservoir and a second end having a thumb pad for receiving medicament delivery pressure for causing said plunger to move within said reservoir to expel the medicament from said reservoir;

    a shield releasably mounted on a front portion of said barrel at a first position; and

    an urging member for urging said shield in a forward direction relative to said syringe assembly, wherein one of said shield and said barrel defines two track arrangements on opposing sides of said one of said shield and said barrel, each of said track arrangements having an entry track having an end joined to a lockout track at an intersection, a first portion of said lockout track extending beyond said intersection to a first end of said lockout track and a second portion of said lockout track extending beyond said intersection to a second end of said lockout track, and the other of said shield and said barrel includes pins arranged on resilient lever arms and guidable in respective ones of said track arrangements,said shield being movable by interaction with an area proximate a needle cannula insertion point on a patient'"'"'s skin from said first position to a second position against the urgency of said urging member when said needle cannula is inserted into a patient for delivery of the medicament, wherein, in each of said track arrangements, said pin moving from a first pin position along said entry track at least to the intersection and into a second pin position in said lock-out track during movement of said shield from the first position to the second position, andsaid shield being moveable from said second position to a third position by the urgency of said urging member upon removal of said needle cannula from said patient, wherein, in each of said track arrangements, said pin moving along said lockout track from said second pin position to a third pin position solely by the urgency of said urging member during movement of said shield from said second position to said third position, the forward ends of said lockout tracks being axially offset so that said shield is held askew relative to said needle cannula by the urgency of said urging member when said shield is in the third position, andwherein said forward tip of said needle cannula is covered by said shield when said shield is in said third position, wherein said one of said shield and said barrel further comprises a blocking element arranged at said end of said entry track proximate said intersection in at least one of said track arrangement, said blocking element having a fixed blocking surface facing said lock-out track of said at least one of said track arrangements and blocking reentry of the associated one of said pins into said entry track from said lock-out track.

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