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Method and device for injection

  • US 4,968,299 A
  • Filed: 06/28/1988
  • Issued: 11/06/1990
  • Est. Priority Date: 07/02/1987
  • Status: Expired due to Term
First Claim
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1. A method of preparing a solution, emulsion, or suspension in a fluid of one or more sensitive medicaments for one or more subsequent injections using a multi-chamber cylindrical ampoule including at least a first chamber of a variable volume for containing the sensitive medicament, said first chamber being sealed at its front end by a membrane penetrable to an injection needle and delimited at its rear end by a first movable member, and a second chamber formed in said cylindrical ampoule for containing the fluid and being defined at its front end by said first movable member and at its rear end by a second movable member, and a connecting passage arranged in a wall of said cylindrical ampoule between said first and second chambers for providing a communication therebetween, said method comprising the steps of:

  • providing a holder member for holding said cylindrical ampoule therein, said holder member including a first and a second part, said first and second part including corresponding threaded means thereon;

    inserting said cylindrical ampoule into one of said parts of said holder member;

    connecting said first and second parts by screwing said corresponding threaded means;

    simultaneously with said screwing, effecting movement of said second movable member with said fluid towards said first movable member for causing movement of said first movable member along the wall of said cylindrical ampoule for opening said connecting passageway;

    continuing screwing of said parts of said holder member whereby a slow, gentle and constant flow of said fluid controlled by the screwing operation is provided from said second into said first chamber for the dissolution, suspension or emulsification of the sensitive medicament in said first chamber.

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