Single-use safety syringe

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/31 (2006.01) A61M 5/32 (2006.01) A61M 25/06 (2006.01)

Patent

CA 2254174

A single-use safety syringe assembly comprises an elongated, generally cylindrical barrel which forms a hollow nozzle located at the distal end of the barrel and which opens into the interior of the barrel. A plunger is slidably mounted in the barrel and forms a longitudinal cavity. A needle holder carries a hollow needle on the distal end, and the needle holder is slidably mounted in the longitudinal cavity of the plunger. The needle holder includes a lateral arm which extends between the plunger cavity and the barrel. A spiral guide slot through a wall of the barrel extends along a proximal end portion of the barrel for engaging the lateral arm of the needle holder and retracting the needle holder within the barrel in response to relative rotational movement between the barrel and the needle holder. A pair of longitudinal ribs strengthen the proximal end portion of the barrel. A locking element for releasably locking the needle holder lateral arm at a distal end of the spiral guide slot is slidably mounted on a track formed on one of the ribs. An OTN catheter may also be employed in combination with the syringe assembly.

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