| 摘要 |
An injection device that retracts automatically is provided. A housing includes means for biasing the syringe from an extended position to a retracted position. The device includes an actuator and a drive, one comprising a flexible arm that engages with a drive surface on the other, allowing the actuator to prevent the former from moving relative to the latter. The arm is prevented from disengaging until the drive has been advanced to a nominal release position, whereupon the arm disengages, allowing the actuator to move relative to the drive and thus releasing the syringe from the action of the actuator, whereupon the biasing means restores the syringe to its retracted position. The arm is biased toward a position at which it engages the drive surface and the action of the actuator causes it to move against its bias, thus disengaging it from the drive surface. |
