Patent ID: 7081107
Filing Date: 2006-07-25
Classification: A61M

Abstract:
1. A syringe comprising: an outer tube provided on the tip end side thereof with a mouth portion permitting a liquid to come in and out therethrough; a gasket slidable in said outer tube; a pusher connected to said gasket and operated to move said gasket in the longitudinal direction of said outer tube; a ventilation means provided in said pusher; and a sealing member sealing a base end opening of said outer tube and having an insertion hole for inserting said pusher therethrough; wherein a first space surrounded by said outer tube and said gasket and located on the tip end side of said gasket, and a second space surrounded by said outer tube, said gasket and said sealing member and located on the base end side of said gasket are provided in said outer tube, and before an operation to push said pusher to the tip end direction, said second space is maintained in the state of being shielded (sealed) from the outside air and, when the operation to push said pusher to the tip end direction is performed, the outside air is let into said second space by said ventilation means.