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Multiple chamber automatic injector

  • US RE35,986 E
  • Filed: 07/24/1995
  • Issued: 12/08/1998
  • Est. Priority Date: 08/23/1988
  • Status: Expired due to Term
First Claim
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1. An automatic injector comprising.Iadd.:

  • .Iaddend.a body incorporating at least two chambers containing different ingredients of a medicament, said .Iadd.at least two .Iaddend.chambers . .being.!. .Iadd.including a forward ingredient chamber containing a first ingredient of said medicament and rearward ingredient chamber containing a second ingredient of said medicament, said forward and rearward ingredient chambers being longitudinally disposed .Iaddend.adjacent one another .Iadd.within said body .Iaddend.and .Iadd.kept in a normally sealed relation from one another,.Iaddend.. .separated by a thin impermeable membrane,.!.a needle . .held.!. .Iadd.normally contained .Iaddend.in a sheathed position within . .said body,.!. .Iadd.said forward ingredient chamber, said needle being movable to an unsheathed position projecting from said body and being capable of dispensing said medicament therethrough,.Iaddend..Iadd.a .Iaddend.releasable drive . .means.!. .Iadd.assembly .Iaddend.within said body which when released drives said needle from said sheathed position into . .an.!. .Iadd.said .Iaddend.unsheathed position projecting from said body,.Iadd.a sealing structure for maintaining said forward and rearward chambers in said normally sealed relation from one another, said sealing structure permitting said chambers to intercommunicate to allow the ingredients to mix within said body in response to a predetermined mixing procedure; and

    an .Iaddend.expulsion . .means.!. .Iadd.member disposed .Iaddend.within said body for discharging the medicament through said needle. ., and a cutting or piercing means which is movable within said body from a first position in which it is separated from said membrane to a second position where it is forcibly in contact with said membrane so as to cut or pierce said membrane before said drive means is released.!.. . .2. An automatic injector according to claim 1, wherein said chambers for the different ingredients of the medicament are arranged axially in said body of the

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