Injection device with simplified stopper retention

Details Injection device with simplified stopper retention Injection device with simplified stopper retention

A - Human Necessities

61

M

A61M 5/315 (2006.01)

Patent

CA 2660692

The invention relates to an injection device, comprising a volume (12, 14), for accommodating a product (12) for administration and a piston (20) to act upon the product within the volume and a stopper (16), which may be arranged between the end of the piston facing the product and the product within the volume. According to the invention, the piston is provided with a piston head (18) which may be sealed in a gas-tight manner which is separate from the stopper (16) such that a low pressure or vacuum region (24) may be developed between the piston head and the stopper.

L'invention concerne un dispositif d'injection comprenant un volume (12, 14) destiné à recevoir un produit à administrer (12), et un piston (20) destiné à agir sur le produit, dans ledit volume, ainsi qu'une butée (16) pouvant être agencée entre l'extrémité du piston du côté du produit, et le produit à l'intérieur du volume. L'invention est caractérisée en ce que le piston est configuré de manière à présenter un disque de piston (18) étanche aux gaz, séparé de la butée (16), de façon qu'une zone de faible pression ou de vide (24) puisse être formée entre le disque de piston et la butée.

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