Patent ID: 7468054

Claim:
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, said barrel having a radial flange arranged between said forward end and said rear end; 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 cause the medicament to be expelled from said reservoir; a hollow shield body receiving said syringe barrel therein, said syringe barrel being selectively movable within said shield body between a first position in which said forward tip of said needle cannula is exposed, and a second position in which said forward tip of said needle cannula is contained within said shield body; a flange clip fixedly coupled to said hollow shield body proximate a rear facing end of said hollow shield body, wherein said flange clip comprises a first retainer fixedly coupled to said hollow shield body to prevent axial movement of said first retainer with respect to said hollow shield body, said first retainer releasably securing said syringe barrel in said first position, and a second retainer spaced axially from said first retainer, wherein said radial flange is positioned between said first and second retainers when said syringe barrel is in said second position, said hollow shield body further comprises a rim and said flange clip comprises a recess engaging said rim for connecting said flange clip to said hollow shield body, said recess being arranged axially between said first and second retainers; and an urging member acting on a portion of said hollow shield body and said radial flange of said syringe barrel for urging said syringe barrel from said first position toward said second position, said thumb pad being configured to interact with said first retainer upon movement of said stopper to a position proximate said syringe barrel forward end to release said syringe barrel from said first retainer and enable said urging member to move said syringe barrel from said first position to said second position upon release of medicament delivery pressure from said thumb pad.