Drug delivery device with compressible drug reservoir
First Claim
Patent Images
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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Accused Products
Abstract
A drug delivery device (50) is provided comprising a drug reservoir (10) and a piston (11). The drug reservoir (10) is provided for comprising a drug and comprises a flexible wall (22) and a dispensing hole (15) for dispensing the drug into an environment of the drug de delivery device (50). The piston (11) is provide for pressing against the flexible wall (22) to compress the drug reservoir (10) for pushing an amount of the drug through the dispensing hole (15). An adhesion interface (51) between a surface of the piston (11) and the flexible wall (22) prevents sliding between the surface of the piston (11) and the flexible wall (22).
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Citations
17 Claims
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1. A capsule, comprising:
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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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A capsule comprising:
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a housing comprising a rigid, dome-shaped cap; an opening through the rigid, dome-shaped cap; a reservoir in the housing defined at least in part by a flexible wall spaced from the opening and an internal surface of the rigid, dome-shaped cap; a piston disposed in the housing on a first side of the flexible wall opposite the opening and arranged to contact the first side of the flexible wall, the flexible wall separating the piston from contents in the reservoir, the piston being movable relative to the opening, and a portion of the piston having a domed shape; and an adhesion interface adhering a portion of the first side of the flexible wall to a portion of the piston, the adhesion interface maintaining conformity of the flexible wall to the portion of the piston having the domed shape. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification