| 摘要 |
<p>A syringe assembly (10) includes a hollow cylindrically shaped barrel (11). The external side of the barrel (11) has a first portion (22) at its proximal end (20), a second portion (24) adjacent the first portion (22) and a third portion (25) adjacent the second portion (24). The diameter (B) of the second portion (24) is less than the diameter (C) of the first portion (22) resulting in formation of a shoulder (26) at the intersection of the first and second portions (22,24). The third portion (25) outside diameter adjacent the second portion (24) is substantially equal to the outside diameter (B) of the second portion (24) and increases to the outside diameter (D) of the barrel (11). The assembly (10) further includes a finger flange (14) with a first side (30) and a second side (31) and an opening (32) with an inside wall (37). The flange opening (32) has an annulus (34) positioned within it which has an opening (28). The annulus (34) has an end (35) attached to the inside wall (37) of the flange opening (32) and an unattached end (38) projecting toward the first side (30) of the flange (14), and forms an acute angle (36) with the inside wall (37) of the flange opening (32). The flange (14) is held by the barrel (11) so that the opening (28) of the annulus (34) rests at the second portion (24) and the unattached end (38) of the annulus (34) is positioned adjacent to the shoulder (26) so that a distal force (F) for installing the flange (14) is less than a proximal force (R) for removal of the flange (14). <IMAGE> <IMAGE></p> |
