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Needle cap device for a pre-fillable one-time injection apparatus

  • US 5,980,495 A
  • Filed: 04/22/1998
  • Issued: 11/09/1999
  • Est. Priority Date: 04/23/1997
  • Status: Expired due to Term
First Claim
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1. A needle cap device for a pre-fillable single-use hypodermic syringe device, said single-use hypodermic syringe device comprising an injector head (2) and an injector needle (4) extending from the injector head and having a tip, wherein said needle cap device includesa stiff plastic outer casing (5) made of a hard elastic material that is sufficiently transparent so that the injector needle is visible when the outer casing (5) is connected to the injector head (2);

  • a sealing lining member (6) made of a soft material and arranged inside the stiff plastic outer casing (5), said sealing lining member having a predetermined shape to fit in the stiff plastic outer casing so that the tip of the injector needle (4) is inserted in the sealing lining member (6) when the outer casing (5) is connected to the injector head (2); and

    means (7,8;

    11,12;

    13,14) for connecting the stiff plastic outer casing (5) with the injector head (2) so that said outer casing (5) directly contacts said injector head (2) to provide a microbiological seal of an interior of the outer casing from an exterior thereto and to provide a stable mechanical connection of the injector head to the outer casing that limits displacement of the outer casing on the injector head when the injector head is inserted in the outer casing;

    wherein the means for connecting, the lining member, the outer casing and the injector head are positioned and dimensioned so that an opening in the tip of the injector needle is not released from the sealing lining member (6) of the outer casing (5) until a pressure in the interior of the outer casing corresponds to an external air pressure during removal of the outer casing from the injector head (2), whereby a drop-free removal of the sealing lining member from the injector needle occurs.

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