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Fill facilitating unit dose injection cartridge and filling method

  • US 6,213,980 B1
  • Filed: 10/26/1999
  • Issued: 04/10/2001
  • Est. Priority Date: 10/26/1999
  • Status: Expired due to Fees
First Claim
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1. A unit dose injection cartridge comprising:

  • a sidewall structure defining an elongated medicament chamber;

    a sealable discharge outlet at a distal end of said medicament chamber;

    a discharge piston seal slidable within the chamber from a proximal end region to a distal end region thereof, said piston seal being removably securable at a first position within the proximal end region;

    a passageway extending, while said piston seal is in said first position, past the plunger from a proximal side to a distal side thereof, the chamber being fillable with medicament by way of the passageway, wherein;

    during filling, air is allowed to escape from the chamber; and

    the piston seal is movable distally to a second position within the proximal end region, after filling of the chamber, to thereby seal-off the chamber from the passageway.

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