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Safety needle assembly

  • US 7,553,293 B2
  • Filed: 11/01/2004
  • Issued: 06/30/2009
  • Est. Priority Date: 11/30/2001
  • Status: Expired due to Term
First Claim
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1. A safety needle assembly comprising:

  • a cylindrical housing (1,40) having a top surface (6) with an opening (8) and a bottom surface (9,50), said housing (1,40) having means for mounting said housing (1,40) onto a medical injection device,a needle cannula (30) mounted in the bottom surface (9,50), said needle cannula (30) having a distal end located at a distal side of the bottom surface (9,50) and extending through said opening (8),a shield (2,43) telescopically movable relatively to the housing (1,40) for movement between a distal position wherein the shield (2,43) covers the distal end of the needle cannula (30) and a proximal position where at least a part of the distal end of the needle cannula (30) is exposed,a spring (25) located, inside said housing (1,40) urging the shield (2,43) in the distal direction,a locking element (16,44) provided inside the housing (1,40) and having at least one outwardly pointing locking protrusion (17,49),wherein said locking element (16,44) is a separate part provided between the spring (25) and the shield (2,43) and longitudinal moved simultaneously with the shield (2,43) relatively to the housing (1,40) during use, whereby the locking protrusion (17,49) provided on the locking element (16) is guided from a first position where the shield (2,43) is in the distal position, via a second position where the shield (2,43) is in the proximal position to a third position where the shield (2,43) is in the distal position and in which third position at least one of the locking protrusions (17,49) is blocked by a blocking surface (15,55) provided on the inside surface of the housing (1,40) whereby further movement of the shield is irreversibly immobilized, and whereby the shield (2,43) is guided during longitudinal movement of the shield (2,43) relative to the housing (1,40) to prevent rotation of the shield (2,43) relative to the housing (1,40) when the locking element is guided from the first position to the second position.

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