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Passive drug delivery apparatus

  • US 5,941,848 A
  • Filed: 11/14/1996
  • Issued: 08/24/1999
  • Est. Priority Date: 11/14/1996
  • Status: Expired due to Fees
First Claim
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1. An apparatus for the delivery of a passively reconstituted beneficial agent contained in a vial into a medical liquid, comprising:

  • first flow path adapted to introduce into the vial the medical liquid from a fluid conduit, the first flow path including an upper chamber of a receptacle disposed in the fluid conduit and an annular space coaxially extending from the upper chamber to an upper part of the vial at around a lower cannula hollow tube which is formed at the lower part of a cannula assembly along the central axis thereof, the cannula assembly extending from the bottom of the vial to a lower chamber of the receptacle when the cannula assembly has piercingly and sealingly been mounted on the receptacle for use;

    second flow path adapted to deliver the mixed solution containing the medical liquid and agent from the vial into the fluid conduit, the second flow path including the lower cannula hollow tube extending from an upper part of the vial to the receptacle lower chamber and the lower chamber; and

    vent passage means for the communication of the vial with the atmosphere, the vent passage including an upper cannula hollow tube which is formed at an upper part of the cannula assembly along the central axis thereof, and which extends from the bottom of the vial to the lower cannula hollow tube, a side cannula tube extending parallel to the lower hollow tube from an end part of the upper cannula hollow tube to a small chamber, which has a vent hole to the atmosphere, and which is intermittently disposed between the vial and the upper chamber, a hollow tube connecting the upper hollow tube and the side hollow tube, and the small chamber.

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