Syringe device having venting system

A syringe device for administering a medicament comprising:

• a syringe tube having a side wall, a distal end, and a proximal end defining a cavity within the syringe tube for containing the medicament, the distal end having a passageway in fluid communication with the cavity, and the proximal end having an opening;
• a plunger rod configured to slide within the cavity of the syringe tube throughout a desired range of motion, the plunger rod having:
• a distal end,
• a proximal end,
• a generally hollow interior, and
• an opening proximate the proximal end of the plunger rod in fluid communication with the hollow interior;
• a filter disposed in the opening proximate the proximal end of the plunger rod;
• a plunger tip engaged with the distal end of the plunger rod and slidable therewith within the cavity, the plunger tip in constant direct sealing engagement with an inner surface of the side wall of the syringe tube;
• a seal supported by the syringe tube proximate the opening at the proximal end of the syringe tube, the seal being in slidable sealing engagement with the plunger rod;
• a first cavity defined between the seal and the plunger tip and between the syringe tube and the plunger rod;
• and
• at least one aperture in the plunger rod in fluid communication with the hollow interior of the plunger rod and the first cavity,
• wherein during sliding movement of the plunger rod within the syringe tube, the first cavity is vented to an exterior of the syringe device through a flowpath including the at least one aperture, the hollow interior of the plunger rod and the filter.