Patent ID: 8936570
Filing Date: 2015-01-20
Classification: A61M

Abstract:
1. A safety syringe, comprising: a cylinder having a space formed therein for storing a certain fluid; a plunger inserted in an inner side of the cylinder and slides therein in a vertical direction; a piston which surrounds and is engaged with an upper portion of the plunger so that the plunger can be in airtight contact with the cylinder; and a needle support which is inserted in an upper side of the cylinder and fixes a needle, wherein the needle support has a body to fix the needle and a plurality of engaging legs extending downward from the body, each leg having an engaging protrusion to horizontally and outwardly protrude from the leg, wherein a needle support insertion member is formed outside of the piston and plunger so as to extend from a top of the plunger toward the needle support, wherein the needle support insertion member has a ring-shaped protrusion and ring-shaped protrusion supports spaced from each other, each ring-shaped protrusion support extending vertically from the top of the plunger toward the needle support, wherein the ring-shaped protrusion protrudes horizontally and inwardly from upper portions of the ring-shaped protrusion supports, and wherein the engaging protrusions of the engaging legs are caught by the ring-shaped protrusion when the needle support in inputted into the inner side of the cylinder for disposal as a wasted after the syringe has been used, wherein a conical center pin having a certain length extends vertically from a center of the needle support insertion member, and a center pin engaging groove is formed at a lower side of the needle support, and two opposite eccentric guide protrusions are formed at an inner side of the center pin engaging groove.