Patent ID: 8758301
Filing Date: 2014-06-24
Classification: A61M,A61P,Y10T

Abstract:
1. An automatic injection device having a proximal end configured to deliver a dose of a therapeutic agent and a distal end configured to be controllable by a user, the automatic injection device comprising: a firing body provided at the distal end of the automatic injection device, the firing body comprising: a hollow tubular member having a bore, and a radial surface extending inwardly from a distal portion of the hollow tubular member; a plunger having a first and second longitudinally extending plunger arm, each plunger arm terminating in a respective, first radially extending plunger foot and a second radially extending plunger foot, the plunger arms extending through the bore of the hollow tubular member of the firing body, and the first and second plunger foot seated on the radial surface of the firing body, the first plunger foot of the first plunger arm has a first conical surface and a second conical surface, and the second plunger foot of the second plunger arm has a first conical surface and a second conical surface, wherein a first contact surface of the plunger is defined by the first conical surface of the first plunger foot and the first conical surface of the second plunger foot, and wherein a second contact surface of the plunger is defined by the second conical surface of the first plunger foot and the second conical surface of the second plunger foot; and a firing button provided at the distal end of the automatic injection device, the firing button comprising: