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Medical syringe

  • US 6,083,200 A
  • Filed: 05/25/1999
  • Issued: 07/04/2000
  • Est. Priority Date: 11/27/1996
  • Status: Expired due to Fees
First Claim
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1. Medical syringe comprising a tubular body, in which a piston slides, the piston having an opening, a blocking unit blocking said opening before the syringe is used, the blocking unit being arranged to cooperate, when the piston reaches the end of its path, with a counter-piece integral with the tubular body of the syringe, so as to expel said blocking unit out of the opening in such a way that after using the syringe the blocking unit definitively no longer obstructs the opening so that the syringe cannot be re-used, wherein the piston is arranged in such a way as to constitute an rigid inner chamber inside which the blocking unit is housed, the whole being arranged so as to impose a predetermined path on the blocking unit, where the blocking unit has at one of its end a blocking head engaged in the opening and at least one element arranged to prevent its returning to its blocking position, said element resting prior to the injection against the inner wall of said inner chamber, in such a way as to generate a force of friction which is added to the force exerted by the edge of the opening on the blocking head, so that the pressure of the liquid acting on the blocking head during the injection is insufficient to expel the blocking head out of the opening, all the elements of the syringe being designed to be produced by moulding and assembled on an automatic production line by axial fitting.

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