Safety syringe for medical use
AssigneeLaboratoire Aquettant
InventorPierre Frezza
Life of this patent
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Abstract
This syringe comprises a tubular piece surrounding the body of the syringe and driving the stem of the plunger of the syringe. During injection, the tubular piece slides forward on the body. At the end of injection the tubular piece detaches from the stem and, its front part can continue to slide in order to sheathe the needle.
Claims9
A safety syringe for medical use, comprising a tubular syringe body intended to contain a liquid to be injected, one end of which is equipped with an injection needle, and inside which is fitted a plunger seal actuated by a stem protruding from the body at the opposite end to the end which is equipped with the needle, and a tubular piece mounted slidably along the syringe body, wherein
- the syringe body is equipped, at its rear end, with at least one radial tab,
- the tubular piece has a length at least equal to a length of the syringe body increased by a length of the needle and includes at least one axial slot extending from its rear end, each slot serving for the passage of one radial tab, and
- the stem is equipped with means for axial immobilization inside the tubular piece at an end opposite the plunger, the immobilization being released as the plunger seal reaches its stroke end, so as to allow the tubular piece to continue its axial movement, so that the front end of the tubular piece sheathes the needle.
Dependencies are inferred from the claim text.