Reusable medication delivery pen

Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...

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

Patent

active

052795861

ABSTRACT:
An injection device medication delivery pen 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 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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patent: 5112317 (1992-05-01), Michel

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