US 11,931,551 B2
Medical injection system
Maxime Nicolas, Grenoble (FR); and Julien Gagliano, Grenoble (FR)
Assigned to Becton Dickinson France, Le Pont de Claix (FR)
Appl. No. 17/045,817
Filed by Becton Dickinson France, Le Pont de Claix (FR)
PCT Filed Apr. 8, 2019, PCT No. PCT/EP2019/058786
§ 371(c)(1), (2) Date Oct. 7, 2020,
PCT Pub. No. WO2019/197325, PCT Pub. Date Oct. 17, 2019.
Claims priority of application No. 18305414 (EP), filed on Apr. 9, 2018.
Prior Publication US 2021/0138154 A1, May 13, 2021
Int. Cl. A61M 5/20 (2006.01); A61M 5/31 (2006.01)
CPC A61M 5/2046 (2013.01) [A61M 5/3137 (2013.01); A61M 2205/75 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A medical injection system adapted for a single-handed injection, the medical injection system comprising:
a housing;
a piston defining a cavity therein, wherein the piston is configured to move relative to the housing;
a gas compartment configured to contain a gas, the gas compartment defined within the housing and the cavity of the piston; and
a reservoir intended to contain a drug composition, the reservoir having a fluid exit configured to receive an injection needle,
wherein the piston is configured to move proximally between a distal position defining a first volume of the gas compartment to a proximal position defining a second volume of the gas compartment smaller than the first volume, and
wherein the gas compartment is configured to be in gas communication with the reservoir in order to force the drug composition through the fluid exit when the piston is moved proximally.