Patent ID: 6409704
Filing Date: 2002-06-25
Classification: A61M

Abstract:
A retractable safety syringe comprising:a syringe barrel (10) having a fixing hole (12) defined in an upper end thereof and a thumb press (16) formed at a lower end thereof; a needle mount (20) assembled in the fixing hole (12) and retained at the upper end of the syringe barrel (10), and integrally formed with an outer hub (22) and an inner hub (24), wherein the inner hub (24) has a fluid passage defined in a center thereof and a plurality of equal-spaced spring clamps (240) formed around a lower end of the fluid passage and extending in an inclined direction towards an upper end of the fluid passage; a plunger rod (30) consisting of a rod (31) and a plunger (32) detachably connected at an upper end of the rod (31), wherein the plunger (32) has a plunger crown (322), a cone-shaped tip end portion (324) formed on a top of the plunger crown (322), and a neck portion (326) formed between the tip end portion (324) and the plunger crown (322); a needle (40) including a connecting portion (41) and a needle cannula (42); whereby when the plunger rod (30) is completely extended into the syringe barrel (10), the tip end portion (324) is inserted into the fluid passage of the needle mount (20), the neck portion (326) is clamped by the plurality of spring clamps (240), therefore, the medicine fluid is able to flow over gaps between each two adjacent spring clamps (240) toward the needle (40), and then the needle (40) and the needle mount (20) are connected with the plunger rod (30) and retractable with the plunger rod (30).