Patent ID: 6929622
Filing Date: 2005-08-16
Classification: A61M

Abstract:
1. A safety syringe cylinder comprising a syringe cylinder, a syringe needle, a push rod; wherein an upper end of the syringe cylinder has a syringe connecting seat; and a center of the syringe connecting seat has a positioning groove; an upper end of the syringe needle is a needle tube and a lower end thereof is a needle; a lower end of the needle has a hook seat; two wedge rings are arranged around the needle; a center of the hook seat is a channel hole; the channel hole penetrates through the needle so as to communicate with the needle tube; a top of the push rod has a push rod body which is formed with a connecting block; the connecting block is inserted into the combining hole of a push rod cap; the push rod cap is made of elastic material; a periphery of the push rod cap has a positioning groove; a top center of the push rod cap has an annular hook groove; the hook groove has two stepped enlarged holes; thereby, the syringe needle is combined with the positioning hole of the syringe connecting meat of the syringe cylinder; and push rod is inserted into the cylinder body of the syringe cylinder; wherein an inner upper end of the syringe cylinder is installed with an annular ring; the annular ring is embedded into the hook groove on the top surface of the push rod cap when the push rod moves upwards to a top end of the syringe cylinder so as to prevent the injection liquid remained in the hook groove.