EP0425003A1 — Training device for an automatic injector

USPTO Abstract

The invention relates to a training device for an automatic injector, comprising a cylindrical outer sleeve, in the rear portion of which a discharge mechanism is connected and in the front portion of which a holder for a punch member is accommodated so as to be locked against forward movement, - in which the discharge mechanism comprises a plunger, a coil spring which acts on said plunger, a locking device and a safety member, - in which the holder for the punch member comprises a sleeve-like rear portion which in open at each end, and - in which the punch member is accommodated in the holder so that the front prod-shaped end portion, which has such dimensions that it can pass through the central aperture in the nose portion of the holder outwards, is present inside the holder prior to use of the device. The rear end portion of the punch member comprises means which, in cooperation with means provided on the inner wall of the resilient sleeve-like rear portion of the holder, prevent undesired backward movement of the punch member in the holder, in which, however, at the area of said means the device is proportioned so that after activation the wall of the holder can expand resiliently outwards within the outer sleeve so as to allow the punch member to pass, and in which spring means are present between the punch member and the locking device which enable locking of the plunger during making the device ready for reuse.