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INJECTION DEVICE WITH SIMPLIFIED STOPPER RETENTION

  • US 20090247957A1
  • Filed: 02/25/2009
  • Published: 10/01/2009
  • Est. Priority Date: 08/30/2006
  • Status: Active Grant
First Claim
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1. An injection device comprising:

  • a volume for accommodating a product for administration, a piston for acting upon the product within the volume, and a stopper disposed between an end of the piston facing the product and the product within the volume, wherein the piston comprises a piston head for sealing in a gas-tight manner, and wherein the piston head is separate from the stopper such that a negative pressure or vacuum region can be developed between the piston head and the stopper.

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