| 摘要 |
A delay mechanism for staging the operation of an automatic injection app aratus (20) to ensure medication contents are properly delivered prior to th e needled syringe (32) of the apparatus being retracted. In one form, the de lay mechanism includes a shuttle (50), a follower (110), a locking member, a damping compound, and a driver and a driver biasing element (44). The shutt le is for a needled syringe of the apparatus and includes a first latching e lement. The follower includes a second latching element and a cammable surfa ce, which second latching element is for cooperating with the first latching element to limit motion of the shuttle relative to the follower in a second direction opposite the first direction. The locking member is movable from a locking position to a release position by engagement with the syringe plun ger during an injection, the locking member, when in the locking position, p reventing rotation of the follower relative to the shuttle, the locking memb er, when in the release position, allowing rotation of the follower relative to the shuttle. The damping compound is between the follower and a supporti ng surface to dampen rotation of the follower relative to the shuttle. The d river is rotatably fixed relative to the shuttle and includes a camming surf ace. The shuttle allowing retracting of the syringe needle into the housing of the automatic injection apparatus after injection. |
