Patent ID: 11878149
Assignee: AMGEN INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 6:
7. A drug delivery device comprising:
a housing defining a longitudinal axis and having an opening;
a drug storage container including a delivery member having an insertion end configured to extend at least partially through the opening during a delivery state;
a plunger moveable toward a distal end of the drug storage container to expel a drug from the drug storage container through the delivery member, the plunger including a body portion having an inner wall defining an axial chamber and an outer wall cooperating with the inner wall to define a body thickness; and
a plunger biasing member disposed at least partially within the axial chamber, the plunger biasing member configured to urge the plunger toward the distal end of the drug storage container,
wherein the plunger is configured to:
selectively rotate from an initial rotational position to a second rotational position under a biasing force exerted by the plunger biasing member, and
translate linearly toward the distal end of the drug storage container under the biasing force exerted by the plunger biasing member after rotating from the initial rotational position to the second rotational position.