US 12,268,847 B1
Devices and methods for delivery of substances within a medicament container
Paul F. Meyers, Fishers, IN (US); and Michael J. Roe, Powhatan, VA (US)
Assigned to kaleo, Inc., Richmond, VA (US)
Filed by kaleo, Inc., Richmond, VA (US)
Filed on Feb. 9, 2022, as Appl. No. 17/668,228.
Claims priority of provisional application 63/147,785, filed on Feb. 10, 2021.
Int. Cl. A61M 5/20 (2006.01); A61M 5/315 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/2046 (2013.01) [A61M 5/31548 (2013.01); A61M 5/3158 (2013.01); A61M 5/322 (2013.01); A61M 5/2053 (2013.01); A61M 2005/2093 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method of delivering a dose of a composition, comprising:
actuating a medical injector via a system actuation assembly such that an energy storage member produces a force via a compressed gas within an internal volume of a housing of the medical injector on a container containing a dose of the composition, the force causing the container to move within the housing to cause a needle to extend from the housing, the movement of the container compressing a retraction spring of the medical injector;
regulating, via a control assembly positioned within the housing, a portion of the force applied on an elastomeric member to cause a movement of the elastomeric member within the container to deliver an initial portion of the dose;
initiating a venting of the internal volume via a vent opening defined by the housing, the vent opening being sized to maintain the force produced by the compressed gas acting on the container at a magnitude that is greater than a force applied to the container by the retraction spring during a time to deliver a final portion of the dose, the force produced by the compressed gas decreasing to a magnitude that is less than the force applied by the retraction spring concurrent with the delivery of the final portion of the dose; and
retracting the needle via a movement of the container within the housing in response to the force applied by the retraction spring.