Patent ID: 9168338
Filing Date: 2015-10-27
Classification: A61M

Abstract:
1. A syringe with a blocking structure, comprising: a cylindrical body including a flange adjacent a proximal end thereof, and a needle seat at an opposing distal end; a rod; a first one-way engagement unit including a circularly formed propping portion extending outwardly from the rod and a circularly formed flexible bracket extending outwardly from the rod and being in spaced overlaying relationship with respect to the propping portion, the flexible bracket having an external diameter greater than an external diameter of the propping portion and positioned intermediate to a pushing end of the rod and the propping portion; and a second one-way engagement unit disposed distally of the first one-way engagement unit for engaging the needle seat when the rod is pushed to the distal end of the cylindrical body, thereby, when the rod is pushed backward with respect to the cylindrical body, proximity of the propping portion to the flexible bracket limits deformation of the flexible bracket upon contacting the flange to block the flexible bracket from moving past the flange, wherein the needle seat receives a needle thereon and the needle seat and the needle are pulled backward into the cylindrical body along with the rod.