| 摘要 |
This invention is a syringe for controlling the amount of material or medical fluid in a syringe body (12) which is expelled therefrom upon depression of a plunger (28) in the syringe body (12). The syringe includes a syringe body (12) having a chamber (22), a discharge end portion (14), and an open opposite end portion, with a plunger received in the syringe body. A measuring ring (44) having an inner thread (48) in mesh with an outer thread (62, 64, 66, 68) on the plunger (28), with latch means for setting and holding the measuring ring (48) and plunger (28), and thus permit an exact volume to be expelled from said chamber (22). |
