Injection device with simplified stopper retention
First Claim
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1. An injection device comprising:
- a first volume for accommodating a product for administration, a piston for acting upon the product within the first volume, and a stopper disposed between an end of the piston facing the product and the product within the first volume, a second volume being defined between the stopper and the end of the piston facing the product, wherein the piston comprises a piston head configured such that when the piston is advanced in an administration direction, fluid outflow is permitted from the second volume in a direction generally opposite the administration direction and wherein the piston head is separate from the stopper such that a negative pressure or vacuum region can be developed in the second volume.
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Abstract
An injection device including a volume for accommodating a product for administration, a piston for acting upon the product within the volume, and a stopper which can be arranged between an end of the piston facing the product and the product within the volume, wherein the piston includes a piston head configured to be sealed in a gas-tight manner, the piston head being separate from the stopper such that a negative pressure or vacuum region can be developed between the piston head and the stopper.
8 Citations
18 Claims
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1. An injection device comprising:
- a first volume for accommodating a product for administration, a piston for acting upon the product within the first volume, and a stopper disposed between an end of the piston facing the product and the product within the first volume, a second volume being defined between the stopper and the end of the piston facing the product, wherein the piston comprises a piston head configured such that when the piston is advanced in an administration direction, fluid outflow is permitted from the second volume in a direction generally opposite the administration direction and wherein the piston head is separate from the stopper such that a negative pressure or vacuum region can be developed in the second volume.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An injection device comprising:
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a first volume for accommodating a product for administration, a piston for acting upon the product within the first volume in an administration direction, the piston comprising a piston head on a distal end thereof, and a stopper disposed between the piston head and the product within the first volume, wherein a second volume is defined between the piston head and a proximal end of the stopper, and wherein the piston head comprises a outflow permitting structure that is configured such that when the piston head is advanced in the administration direction fluid outflow is permitted from the second volume in a direction generally opposite the administration direction to achieve a negative pressure region in the second volume, thereby reducing movements of the stopper in the administration direction independent of movement of the piston. - View Dependent Claims (16, 17, 18)
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Specification