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Drug delivery device with compressible drug reservoir

  • US 10,046,109 B2
  • Filed: 08/10/2010
  • Issued: 08/14/2018
  • Est. Priority Date: 08/12/2009
  • Status: Active Grant
First Claim
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1. A capsule, comprising:

  • a reservoir defining a volume for containing a substance, the reservoir comprising a flexible wall and a hole providing a fluid passageway between the reservoir and an environment;

    a piston disposed on a side of the flexible wall opposite the volume, the piston comprising an outer surface proximate a side of the flexible wall opposite the volume;

    an adhesion interface adhering the outer surface of the piston to the side of the flexible wall opposite the volume to maintain conformity of the flexible wall to the piston, andwherein at least one of the following holds;

    (1) the adhesion surface comprises a sticky coating on the surface of the piston, the sticky coating comprising a silicon based resin, (2) the adhesion surface comprises a magnetic coating, or (3) the adhesion surface comprises an electrostatically charged polymer.

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