Autoinjector with multichamber product container

Inventors

Heiniger, Lukas • Wittmann, Jürgen • Stettler, Peter

Assignees

Ypsomed AG

Abstract

An autoinjector for discharging one or more liquid products includes: a housing containing a multichamber product container, which includes a syringe body and an injection needle rigidly arranged at the distal end of the syringe body. The syringe body includes a first chamber for a first liquid product, a second chamber for a second liquid product, and a bypass for fluidically connecting the first chamber and second chamber. The bypass is formed in or on the syringe body in the form of a curved section protruding radially outwards, and two plungers are arranged in the syringe body in an axially movable manner.

Core Innovation

The invention relates to an autoinjector for discharging one or more liquid products. The autoinjector includes a housing and a multichamber product container arranged in the housing, where the container comprises a syringe body and an injection needle rigidly coupled to a distal end of the syringe body. The syringe body comprises a first chamber configured for a first liquid product, a second chamber configured for a second liquid product, and a bypass for fluidically connecting the first chamber and second chamber, where the bypass is formed in or on the syringe body as a curved section protruding radially outward.

Inside the syringe body, a first plunger and a second plunger are arranged in an axially movable manner. In an initial position, the first liquid product and the second liquid product are separated from one another by the second plunger, and during discharge the first plunger and/or the second plunger are movable in a discharge direction to discharge the product contained in the multichamber product container. A drive element acts on the first plunger during discharge, and a first spring acts on the drive element so that a bias of the first spring is sufficient to discharge the liquid product or plurality of liquid products out of the second chamber by moving the drive element by a discharge stroke.

The multichamber product container is axially fixed in the housing or in the multichamber product container holder by a cutout receiving the bypass. The housing or the multichamber product container holder comprises a cutout in which the bypass is received, and the cutout is configured with a distal stop and a proximal stop to axially fix the bypass. The cutout can taper to rotationally fix the bypass, and the cutout and stops can be elastically and/or plastically deformable. The disclosed mechanical integration further includes safety-relevant housing and needle shielding concepts and a signal member producing an acoustic or tactile signal at end of discharge, as well as switching/locking modules that prevent needle re-exposure.

Claims Coverage

The partial content provides one independent claim and dependent refinements. Its inventive features center on the curved radially protruding bypass in a multichamber syringe, axially movable first and second plungers separating products initially, a spring-driven drive element discharging via a discharge stroke, and axial fixation of the bypass by a cutout with distal and proximal stops.

The claim coverage emphasizes a multichamber syringe body with a curved radially outward bypass, axially movable plungers that separate products initially, a spring-biased drive that discharges from the second chamber by a discharge stroke, and a cutout with distal/proximal stops to axially fix the bypass; dependent refinements further add tapered rotational fixation and deformable cutout/stop behavior.

Stated Advantages

Documented Applications

No documented applications found