Patent ID: 6544234
Filing Date: 2003-04-08
Classification: A61M

Abstract:
An injection device comprisinga housing and an energy storage spring arranged therein for storing energy for an injection operation, said housing having an end proximal to a patient and an end distal with respect to said patient, an ejection member, acted upon in the proximal direction by said energy storage spring, for ejecting injection liquid from a vessel with injection liquid, displaceably arranged in the housing, said vessel having a proximal end adapted for mounting an injection needle; a displacement member, displaceable in the longitudinal direction in the housing, for displacing the vessel in the housing in the proximal direction in order to effect a movement of the injection needle in the proximal direction and thus, during the injection operation, an insertion of the injection needle; a detent lug, provided on the ejection member, associated with which is a corresponding detent opening in the displacement member, the detent lug and detent opening together forming a releasable joining member between the ejection member and displacement member; and a control member, effective in position-dependent fashion, for disengaging the detent lug from the detent opening when the displacement member, during the injection operation, has traveled a predefined distance in the proximal direction, in order, after disengagement of the detent lug, to effect a proximal movement of the ejection member independent of a proximal movement of the displacement member, and thus an ejection of injection liquid from the vessel.