Filling device with sound indicator for filling injection syringe

Claim 1

A filling device for a syringe, including barrel and stem portions, comprising a case portion, and including: movable holding means for releasably securing the stem portion of the syringe, and adapted to load or unload the syringe by movement of the stem portion; a linear gear, including gear teeth attached to the holding means, and adapted to move the holding means; a rotary encoding switch mounted by the case portion for actuating the linear gear; a microprocessor, and a sounding element connected thereto, the microprocessor being connected to the encoding switch and adapted to actuate an audible tone, or an artificial voice from the sounding element; a locking arm mounted on the filling device and adapted to secure the syringe against movement when the syringe stem portion is moved to load or unload the syringe, the locking arm being adapted to release the syringe after loading; and, means for detachably mounting to the filling device a bottle containing liquid medicine for loading or unloading by the syringe; whereby: movement of the encoding switch in one direction actuates the linear gear and causes the holding means to load the syringe with liquid medicine from the medicine bottle, and movement of the encoding switch in an opposite direction actuates the linear gear to cause the holding means to unload liquid medicine into the bottle; and, movement of the encoding switch transmits a signal to the microprocessor, thereby producing a sound from the sounding element coinciding with an increment of movement of the encoding switch, corresponding to an increment of movement of an individual gear tooth of the linear gear, each sound being equivalent to a predetermined amount of liquid medicine loaded or unloaded by the syringe.