| 摘要 |
A syringe apparatus having a syringe barrel open-ended on a first end for receiving a piston therewithin for movement down the syringe barrel, and having on the second end a constricted neck portion with a bore therethrough in communication with the bore within the syringe barrel. There would be further provided a needle portion having an upper base for mounting the upper portion of the needle, with the needle slidable within the bore of the constricted neck portion, from a position retracted into the neck portion to a position movable out of the end of the neck portion for injection. There is further provided a first and second locking members. The first locking member allows locking engagement between the slidable piston within the barrel and the lower base portion of the needle, so that when in the locked position the needle moves in relation with the piston portion. There is further provided a second locking member between the needle portion and the constricted neck portion of the barrel, so that the needle may be locked into injection position, i.e., the needle extruding out of the neck portion during use. Following the injection, the needle can be unlocked from the constricted neck portion and retracted back into the barrel for disposal, thus eliminating the hazard of an exposed contaminated needle, further extraction of the plunger portion from the syringe prior to disposal of same.
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