Automatic injection devices
First Claim
Patent Images
1. A syringe plunger, comprising:
- an upper solid portion having a circular cross-sectional profile;
a lower solid portion having a distal end operable to move a bung and to transmit an expulsion force thereto, the lower solid portion having a circular cross-sectional profile and a first circular circumference; and
a projecting portion comprising two flexible elbows on either side of a central void extending along a central axis of the plunger between the upper and lower solid portions, wherein the flexible elbows project outwardly from the central void when the projecting portion is in a first projecting position, and wherein the flexible elbows are inwardly collapsible toward the central void to fit within the first circular circumference when the projecting portion is in a second collapsed position.
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Accused Products
Abstract
An injection device comprises a syringe extendible against a spring bias from a retracted position in a housing to a projecting injecting position. A spring biased plunger has collapsible elbows which, when the plunger is released, initially engage the end of the syringe to drive it to the projecting position, whereupon arresting of the syringe movement causes the elbows to collapse inside the syringe to allow the plunger to engage and drive the bung.
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Citations
7 Claims
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1. A syringe plunger, comprising:
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an upper solid portion having a circular cross-sectional profile; a lower solid portion having a distal end operable to move a bung and to transmit an expulsion force thereto, the lower solid portion having a circular cross-sectional profile and a first circular circumference; and a projecting portion comprising two flexible elbows on either side of a central void extending along a central axis of the plunger between the upper and lower solid portions, wherein the flexible elbows project outwardly from the central void when the projecting portion is in a first projecting position, and wherein the flexible elbows are inwardly collapsible toward the central void to fit within the first circular circumference when the projecting portion is in a second collapsed position. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification