Cap for an ampoule of an injection unit

  • US 5,554,134 A
  • Filed: 03/31/1994
  • Issued: 09/10/1996
  • Est. Priority Date: 09/21/1990
  • Status: Expired due to Fees
First Claim
Patent Images

1. A closure for an ampoule for an injection unit, said ampoule having a hollow, cylindrical barrel (11) with a distal end and a proximal end, said distal end terminating in a neck (12), an outwardly directed annular projection (30) on the neck, and a piston closing the proximal end of the barrel, said closure comprising:

  • a disc shaped part (31);

    a holding cap comprising a proximal section in the form of a skirt (35;

    62) having one or more interior projections (38) at its proximal end for engagement behind the annular projection (30) of the barrel neck, and a distal section having means for attaching a needle thereto, the holding cap engaging the disc-shaped part (31) pressing it sealingly against the annular projection; and

    a locking ring (20;

    64) provided on the outside of the skirt (35;

    62) locking the projections (38) in their engagement position behind the annular projection (30), wherein the locking ring (20;

    64) and the skirt (35;

    62) are a pair of elements provided with mutually engaging means in the form of resilient fingers (37;

    65) on one of the elements, recesses (36;

    66) are provided behind the fingers in the element carrying the fingers to accommodate said fingers when the locking ring (20;

    64) is passed over the skirt (35;

    62), and an edge is provided on the other element not carrying the fingers (37;

    65) over which edge the fingers (37;

    65) grip irreversibly when the locking ring is mounted in a locking position on the skirt.

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