US 10,238,805 B2 · Automatic injection device for administration of high viscosity medication

Abstract

An automatic injection device configured for injection of a material stored in a syringe into an injection site, the syringe including a generally cylindrical storage container and a piston disposed therewithin, whose exact initial axial position within the container is not predetermined, wherein axial forward displacement of the piston in the container forces the material forwardly out of the container, the automatic injection device including at least one spring drive assembly operative, when actuated, to initially apply a first axial force to the syringe, thereby to axially displace the syringe in a forward direction, and thereafter, responsive to driving engagement with the piston, to apply a second axial force, substantially greater than the first axial force, notwithstanding the fact that the exact axial position of the piston within the container is not predetermined, to the piston, thereby to axially forwardly displace the piston relative to the syringe.

Claims20

Dependent claims

An automatic injection device configured for injection of a material stored in a syringe into an injection site, said syringe including a generally cylindrical storage container and a piston disposed within said generally cylindrical storage container, wherein axial forward displacement of said piston in said generally cylindrical storage container forces said material forwardly out of said generally cylindrical storage container, said automatic injection device comprising:

at least one spring drive assembly operative, when actuated:
to initially apply a first axial force to said syringe, thereby to axially displace said syringe in a forward direction;
and
thereafter, responsive to driving engagement with said piston, to apply a second axial force, greater than said first axial force, to said piston, thereby to axially displace said piston relative to said syringe in said forward direction,
wherein the spring drive assembly is operative to engage said piston prior to application of said second axial force.

2 more elements

at least one spring drive assembly operative, when actuated:
to initially apply a first axial force to a plunger to axially displace said plunger in a forward direction;
and
thereafter, responsive to engagement of said plunger with said piston, to apply a second axial force, greater than said first axial force, to said piston, thereby to axially displace said piston relative to said syringe in said forward direction,
wherein the spring drive assembly is operative to engage said piston prior to application of said second axial force.

2 more elements

Dependencies are inferred from the claim text.

Automatic injection device for administration of high viscosity medication

Life of this patent

Automatic injection device for administration of high viscosity medication

Life of this patent

Abstract

Claims20