Medication delivery pen having improved dose delivery features
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United States of America Patent
Stats
-
Jan 18, 1994
Grant Date -
N/A
app pub date -
Feb 4, 1992
filing date -
Feb 4, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An injection device is provided for injecting fluids such as insulin within body tissue. The device includes a housing, 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 dose setting mechanism includes a units counter ring and a tens counter ring. A transmission key is provided for selectively coupling the units and tens counter rings so that they rotate together only during selected portions of the dose setting procedure. The piston rod includes a plunger and a lead screw slidably positioned within the plunger. The plunger and lead screw are coupled by a pair of half nuts. 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 may accordingly be installed quickly and easily as the lead screw is easily displaced by a new cartridge.
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