Patent ID: 11878158
Assignee: MERCK SHARP & DOHME LLC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A drug delivery device comprising:
a drug container comprising at least one bellow, wherein each and every bellow of the at least one bellow comprises a first surface and an opposing second surface, wherein the first surface is comprised of a first Belleville spring and the opposing second surface is comprised of a second Belleville spring, wherein the second Belleville spring has a higher spring rate than the first Belleville spring; or a drug container extending between a distal end and a proximal end, and comprises a continuous change in cross section from the proximal end to the distal end;
a needle, wherein the needle is in liquid communication with the drug container;
a plunger wherein the plunger extends between a proximal end and a distal end, and wherein the plunger has a cam follower, and wherein the plunger is in communication with the drug container where upon axial movement of the plunger, the drug container is compressed;
a main body extending between a proximal end and a distal end and comprising an inner body and an outer body, wherein the inner body houses the plunger and the drug container and the outer body is capable of sliding over the inner body and extending past the needle, and wherein in the outer body comprises a cam track, wherein the cam follower on the plunger is capable of traveling along the cam track on the outer body; and
a spring located between the inner body and the outer body for urging the outer body to slide over the inner body and extend past the needle.