US 11,957,878 B2
Process and autoinjector device for injections with increased patient comfort
William G. Atterbury, Columbus, OH (US); and Douglas E. Boyd, Columbus, OH (US)
Assigned to Battelle Memorial Institute, Columbus, OH (US)
Filed by Battelle Memorial Institute, Columbus, OH (US)
Filed on Jun. 8, 2021, as Appl. No. 17/342,530.
Application 17/342,530 is a division of application No. 15/742,507, granted, now 11,052,195, previously published as PCT/US2016/041189, filed on Jul. 6, 2016.
Claims priority of provisional application 62/189,134, filed on Jul. 6, 2015.
Prior Publication US 2021/0369965 A1, Dec. 2, 2021
Int. Cl. A61M 5/20 (2006.01); A61M 5/315 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/2033 (2013.01) [A61M 5/326 (2013.01); A61M 5/3287 (2013.01); A61M 2005/206 (2013.01); A61M 2005/2073 (2013.01); A61M 5/3155 (2013.01); A61M 5/31583 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of injecting a medicament from a syringe, comprising:
providing a driving force that moves a plunger down the syringe from a distal position toward a proximal position;
wherein a torsion spring is attached at a distal end to a first surface and at a proximal end to a second surface;
wherein the second surface moves with the plunger;
wherein an early stage movement of the plunger toward the proximal position twists the torsion spring to store energy in the torsion spring;
and, subsequently, at a later stage, as the driving force continues to move the plunger toward the proximal position, and the second surface moves with the plunger, the torsion spring rotates through a prescribed path to modify the driving force moving the plunger toward the proximal position.