US 12,226,616 B2
Auto injector with adaptable air-shot mechanism
Per Mølgaard Pedersen, Struer (DK); Flemming Madsen, Aalborg SV (DK); Sven Erik Poulsen, Skive (DK); Steen Jensen, Dragør (DK); and Henrik Egesborg, Hellerup (DK)
Assigned to Ascendis Pharma A/S, Hellerup (DK)
Filed by Ascendis Pharma A/S, Hellerup (DK)
Filed on Jan. 17, 2024, as Appl. No. 18/415,452.
Application 18/415,452 is a continuation of application No. 17/816,360, filed on Jul. 29, 2022, granted, now 11,969,581.
Application 17/816,360 is a continuation of application No. 16/060,606, granted, now 11,517,673, issued on Dec. 6, 2022, previously published as PCT/EP2016/082859, filed on Dec. 29, 2016.
Claims priority of application No. 15203171 (EP), filed on Dec. 30, 2015.
Prior Publication US 2024/0165336 A1, May 23, 2024
Int. Cl. A61M 5/31 (2006.01); A61M 5/20 (2006.01); A61M 5/24 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/3146 (2013.01) [A61M 5/20 (2013.01); A61M 5/24 (2013.01); A61M 5/31511 (2013.01); A61M 2005/2411 (2013.01); A61M 2205/215 (2013.01); A61M 2205/3368 (2013.01); A61M 2205/6018 (2013.01); A61M 2205/6054 (2013.01); A61M 2205/6063 (2013.01); A61M 2205/6072 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An auto injector for administering a medicament, comprising:
a housing;
a cartridge receiver configured to receive a cartridge assembly comprising a cartridge and a cartridge code feature, wherein the cartridge contains the medicament;
a code sensor configured to read the cartridge code feature;
a drive module coupled to move a plunger rod;
a resistance sensor configured to provide a resistance signal indicative of resistance against movement of the plunger rod and a processing unit coupled to the code sensor, the drive module and to the resistance sensor;
wherein the processing unit is configured to:
receive the resistance signal and determine the resistance against movement of the plunger rod based on the resistance signal;
receive from the code sensor a code signal indicative of the cartridge code feature; and
control the drive module to move the plunger rod to a first plunger rod position based on the resistance signal, wherein the first plunger rod position is based on the code signal, and wherein the first plunger rod position is selected to expel air from the cartridge.