Auto-injectors for administration of a medicament within a prefilled syringe
Inventors
Edwards, Eric S. • Edwards, Evan T. • Meyers, Paul F.
Assignees
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Publication Number
US-11517674-B2
Publication Date
2022-12-06
Expiration Date
Abstract
An apparatus includes a housing, a carrier, and an expandable assembly. The housing defines an opening configured to selectively place a gas chamber of the housing in fluid communication with an exterior volume. The carrier is movably disposed within the housing and is coupled to a medicament container. A proximal surface of the carrier defines a portion of a boundary of the gas chamber. The expandable assembly has a first member and a second member. The first member is coupled to an elastomeric member disposed within the medicament container, and the second member includes a valve portion. The expandable assembly transitions from a collapsed configuration to an expanded configuration when the elastomeric member moves within the medicament container. The valve portion moves relative to the opening when the expandable assembly transitions from the first to the second configuration, placing the gas chamber in fluid communication with the exterior volume.
Core Innovation
The disclosed invention provides a dual medicament medical injector apparatus in which a housing defines a gas chamber and encloses an energy storage member and two medicament container assemblies. The energy storage member produces pressurized gas within the gas chamber to exert a force on both medicament container assemblies, and each assembly includes a container body, an elastomeric member, and a needle coupled to a distal end portion of the container body and disposed within the housing.
As the pressurized gas force acts, the first medicament container assembly moves within the housing so that the first needle moves from within the housing to an exterior volume outside of the housing. The first elastomeric member moves within the first container body to convey a first medicament contained therein in response to the force, and in parallel the second medicament container assembly moves within the housing so that the second needle moves from within the housing to the exterior volume while the second elastomeric member conveys a second medicament contained therein in response to the force.
The disclosure further describes a carrier-based gas chamber arrangement in which first and second carriers are coupled to respective container bodies and a proximal surface of each carrier defines a portion of a boundary of the gas chamber. The claims also recite target placement of the housing and actuation of the energy storage member to produce pressurized gas for simultaneous dual medicament delivery, with release mechanism, retraction springs, gas vent or valve, and fluidic isolation language appearing in the disclosure.
Claims Coverage
The independent claims cover four inventive features. The core inventive structure is a dual medicament gas-chamber delivery architecture with coordinated motion and conveying by respective elastomeric members or carriers, together with target placement and actuation for exterior needle movement and medicament conveyance.
Dual medicament gas chamber with energy storage pressure
A housing defining a gas chamber, and an energy storage member disposed within the housing and configured to produce a pressurized gas within the gas chamber.
Two medicament container assemblies conveying respective medicaments under gas force
A first medicament container assembly and a second medicament container assembly disposed within the housing, each including a container body, an elastomeric member, and a needle coupled to a distal end portion of the container body, configured to move within the housing in response to the force such that the needle moves from within the housing to an exterior volume while the elastomeric member conveys a respective medicament contained therein in response to the force.
Carriers defining portions of gas chamber boundary
First and second medicament container assemblies each include a carrier coupled to a respective container body and configured to move within the housing to convey a respective medicament in response to the force exerted by the pressurized gas, wherein a proximal surface of the first carrier defines a first portion of a boundary of the gas chamber and a proximal surface of the second carrier defines a second portion of the boundary of the gas chamber.
Target placement and simultaneous dual medicament delivery by pressurized gas actuation
Placing a housing of a medical injector into contact with a target location and actuating the energy storage member to produce a pressurized gas within the gas chamber such that the first and second medicament container assemblies move within the housing in response to the force so that the first and second needles move from within the housing to an exterior volume, and the first and second elastomeric members convey the first and second medicaments contained therein in response to the force.
The claims center on a dual medicament delivery apparatus in which pressurized gas produced by an energy storage member drives two medicament container assemblies so that respective needles move from within a housing to an exterior volume while respective elastomeric members or carriers convey respective medicaments. The method claim additionally covers placing the injector housing at a target location and actuating the energy storage to generate pressurized gas that produces the dual conveying and needle movement.
Stated Advantages
Documented Applications
No documented applications found
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