Patent ID: 7727195
Filing Date: 2010-06-01
Classification: A61M

Abstract:
1. 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; a plunger rod sealingly engaged with the syringe tube, the plunger rod being slidingly disposed at least partially within the cavity of the syringe tube, the plunger rod having a distal end, a generally hollow interior, and a generally open proximal end, the plunger rod including at least one aperture in fluid communication with the hollow interior of the plunger rod; and a plunger tip engaged with the distal end of the plunger rod and configured to slide within the cavity throughout a range of motion, the plunger tip in constant direct sealing engagement with an inner surface of the side wall of the syringe tube to separate the cavity into first and second areas as the plunger tip slides throughout the range of motion, the first area disposed between the plunger tip and the proximal end of the syringed tube and the second area disposed between the plunger tip and the distal end of the syringe tube, the at least one aperture fluidly connecting the hollow interior of the plunger rod and the first area of the cavity of the syringe tube, such that the generally hollow interior of the plunger rod allows air to move between an outside of the syringe device and the first area of the cavity during sliding movement of the plunger rod within the syringe tube.