Cap for an ampoule of an injection unit
First Claim
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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Accused Products
Abstract
A closure for the outlet end of an ampoule having a neck with an outwardly extending annular projection (30), said closure comprising a holding cap (18;61) with a skirt (35;62) with interior protrusions (38) for engagement behind the annular projection (30) of the neck, which holding cap engages a disc shape part (31) to press it sealingly against the annular projection (30). A locking ring (20;64) on the outer side of the skirt (35;62) locks projections (38) in their engagement position behind the annular projection (30). Resilient fingers (37;65) and recesses (36;66) are provided on either the skirt or the locking ring, the recesses being positioned below the fingers so that the fingers may be pushed into the recesses when the locking ring is passed over the skirt. Either the skirt (35) or the locking ring (64), which part is not provided with the fingers and recesses, is provided with an edge over which the fingers may grip irreversibly when the locking ring is mounted in position on the skirt.
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Citations
4 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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Specification