초록 ▼

A syringe (10) comprises a barrel (11) containing an internal cylindrical body (12) containing a liquid (14) and communicating with a delivery needle (15). The needle (15) is covered before use by a removable sheath (16), and after the sheath (16) is removed, the needle (15) is concealed by a displa

A syringe (10) comprises a barrel (11) containing an internal cylindrical body (12) containing a liquid (14) and communicating with a delivery needle (15). The needle (15) is covered before use by a removable sheath (16), and after the sheath (16) is removed, the needle (15) is concealed by a displaceable sleeve (20). In use the sleeve (20) is pressed against the skin by applying pressure while holding the barrel (11). The sleeve (20) is thereby retracted into the barrel (11) allowing the needle (15) to penetrate the skin. The movement of the sleeve (20) also activates a gas generator (17) which expels the liquid (14) from the needle (15). When delivery is complete and the syringe (10) is taken from the skin, a coil spring (22) moves the sleeve (20) back to the starting position again concealing the needle (15). The coil spring (22) is torsionally biased before use and causes a rotational movement of the sleeve (20) relative to the barrel (11) when the sleeve (20) moves into and out of the barrel (11). This rotational movement engages a locking mechanism which prevents further movement of the sleeve (20) and thereby permanently conceals the needle (15).

대표청구항 ▼

[ What is claimed is:] [1.] A syringe comprising:a) a barrel having a liquid drug reservoir therein, the barrel having a first end and a second end;b) a delivery needle mounted on the first end of the barrel;c) a gas generator located at the second end of the barrel, the gas generator in communicati

[ What is claimed is:] [1.] A syringe comprising:a) a barrel having a liquid drug reservoir therein, the barrel having a first end and a second end;b) a delivery needle mounted on the first end of the barrel;c) a gas generator located at the second end of the barrel, the gas generator in communication with the reservoir when the gas generator is activated;d) gas generation activation means; ande) a sleeve moveably mounted on the first end of the barrel from a first position where the tip of the needle is concealed by the sleeve to a second position where the tip of the needle is exposed to a third gas generation activation position,f) whereby when the sleeve is initially pressed against an injection site, the sleeve moves from the first position to the second position, and the tip of the needle penetrates the injection site, and when the sleeve moves from the second position to the third position, it causes activation of the gas generator which drives a liquid from the reservoir into the injection site through the needle.