| 摘要 |
<p>An injection device medication delivery pen (10) is provided for injecting fluids such as insulin within body tissue. The device includes a housing (20), a piston rod movably mounted within the housing, and a dose setting mechanism for controlling the movement of the piston rod with respect to a fluid containing cartridge removably positioned within the housing. The piston rod includes a plunger (22) and a lead screw slidably (26) positioned within the plunger. The plunger and lead screw are coupled by a pair of half nuts (28). The half nuts may be uncoupled from the lead screw in order to allow it to slide freely with respect to the plunger. A new cartridge (46) may accordingly be installed quickly and easily as the lead screw is easily displaced by a new cartridge. <IMAGE></p> |
