Patent ID: 8172797
Filing Date: 2012-05-08
Classification: A61M

Abstract:
1. An injection device, comprising: a housing; a container arranged inside said housing and containing medicament to be injected through a needle attachable to said container; a drive mechanism, comprising a drive plate and a tubular member arranged parallel with, and on a side of, the container; a locking mechanism arranged to hold the drive mechanism in a loaded state; an activating mechanism configured to release the locking mechanism; wherein the drive mechanism is arranged to operate on the container for penetrating the needle into an injection site and injecting the medicament when the locking mechanism is released by the activating mechanism; a gas spring arranged inside the tubular member and comprising a rear end fixedly attached to an end cap which is fixedly attached to the housing and a forward end of a piston rod fixedly attached to an end wall of the tubular member, wherein the gas spring has a constant and consistent damping force characteristic for driving the drive mechanism with a constant and consistent damping force along its entire stroke length when the locking mechanism is released; and a reloading mechanism connected to the drive mechanism and configured to move the drive mechanism to the loaded state and thereby reload the gas spring; wherein the container is arranged in a container holder, the container holder from a first position, in which the needle is protected inside the housing, to a second position, in which the needle protrudes outside the housing, and the drive mechanism is configured to act on the container holder for performing the penetration of the needle.