Patent ID: 9408982
Filing Date: 2016-08-09
CPC Classification: A61M

Claim Text:
1. A safety syringe including: a hollow and substantially cylindrical injection barrel having a distal end and a proximal end and having a connecting portion at the distal end and an opening at the proximal end thereof; a needle assembly including an injection needle and a needle base, the injection needle having a distal end and a proximal end, the needle base having a distal end and a proximal end, and the needle base being fixed to the proximal end of the injection needle and being connected to the connecting portion of the injection barrel; a gasket provided liquid-tightly and slidably in the injection barrel, the gasket having a distal end and a proximal end; a plunger being connected to the proximal end of the gasket, the plunger having a distal end and a proximal end and being rotatable in the injection barrel; joining means provided at the distal end of the gasket or the distal end of the plunger; and joined means provided at the proximal end of the needle base; the safety syringe further comprising a joint preventing means, which prevents only movement of the plunger toward the distal end of the injection barrel and allows movement of the plunger toward the proximal end of the injection barrel, whereby the joining means and the joined means are prevented from being joined unintentionally before use, and are allowed to be joined to each other when in use, the joint preventing means including an engaging portion provided in an interior of the proximal end of the injection barrel and an engaged portion provided at a midsection of the plunger, and the engaging portion and the engaged portion being engaged before use and disengaged during use; wherein the engaging portion provided in the interior of the proximal end of the injection barrel is an engaging rib provided on a portion of an inner wall of the injection barrel and the engaged portion is a proximal end of an L-shape vertical rib provided on the plunger, the L-shaped vertical rib being engaged with the engaging rib in a first position of the rotatable plunger prior to use and disengaged with the engaging rib in a second rotated position of the rotatable plunger during use.