| 摘要 |
A safety syringe assembly includes an elongated, generally cylindrical barrel (10) having a hollow interior forming a hollow nozzle (15) located at a distal end of the barrel and opening into the interior of the barrel. A plunger (11) is slidably mounted in the barrel and has a longitudinal open channel (33). A needle holder (14) mounts a needle (13) at a distal end thereof and is slidably mounted in the longitudinal open channel (33) of the plunger (11) for movement between an advanced position in which the needle (13) on the distal end of the needle holder (14) projects from a distal end of the nozzle (15), and a retracted position in which the needle (13) is retracted within the barrel (10). A compression spring (300) is mounted inside of the barrel (10), and a spring retainer element (302) has a spring support portion extending from the interiorly of the barrel (10) to a portion for mounted within the barrel (10) and supporting a distal end portion of the spring (300) against expansion. The spring (300) urges the needle holder (14) toward its retracted position. A latch (308) has a closed position in which the needle holder (14) is latched relative to the barrel (10) to hold the needle holder (14) in its advanced position against the urging of the spring (300), and an open position in which the needle holder (14) is unlatched relative to the barrel (10) to allow the spring (300) to expand in a proximal direction to move the needle holder (14) to its retracted position. <IMAGE> |
