| 摘要 |
A dose setting and repeating syringe (2) allows the user to simply and accurately make a series of injections, each of the same dose. The syringe includes a dose programming assembly which permits the dose for each injection to be preset by limiting the distance the piston (16) housed within the barrel (4) of the syringe moves. This can be done in various ways, such as mechanically, using a ratchet assembly (22, 28), or hydraulically, using a generally conventional cartridge (92) containing the pharmaceutical. A user-actuated dose plunger (40) is connected to the piston (16) and is used to drive the piston down the barrel. The axial movement of the dose plunger, and thus the dose dispensed, depends on the axial position of a dose ring (52) threaded to the proximal end (12) of the barrel.
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