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Automatic injection device

  • US 6,620,137 B2
  • Filed: 08/07/2001
  • Issued: 09/16/2003
  • Est. Priority Date: 05/15/1998
  • Status: Expired due to Term
First Claim
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1. An injection device for administering a product, comprising:

  • a) a housing;

    b) a piston disposed within the housing; and

    c) a driven member shiftably disposed within the housing, wherein the driven member remains uncoupled with the piston until the driven member reaches a predetermined frontal position, and upon the driven member reaching the predetermined frontal position, the driven member becomes coupled with the piston wherein the injection device has a longitudinal axis and the coupling between the driven member and the piston is caused by a movement of the driven member around a rotational axis.

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