Medication delivery pen having improved dose delivery features

Details Medication delivery pen having improved dose delivery features Medication delivery pen having improved dose delivery features

1992-02-04

1994-01-18

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604211, 604218, 604232, 222 43, 222 46, 222 48, 222336, 222309, A61M 500

Patent

active

052795853

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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