Medication delivery pen with variable increment dose scale
First Claim
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1. A medication delivery pen comprising:
- a medication-containing cartridge assembly having a cartridge with a pierceably sealed distal end, an open proximal end having an array of threads, and a plunger in sliding fluid tight engagement within said cartridge at a location distally of said array of threads; and
a pen body assembly having;
a housing with opposed proximal and distal ends, said proximal end having a projection therein and said distal end having an array of threads dimensioned and pitched for threaded engagement with said threads at said proximal end of said cartridge assembly;
a lead screw having a proximal end slidably mounted within said housing, a distal end projecting beyond said distal end of said housing for selective engagement with said plunger, and threads extending between said proximal and distal ends of said lead screw; and
a rotatable dose setting knob having a groove for receiving said projection and a plurality of dosage indicia for a predefined range of dosage increments, said groove having at least two differently pitched regions, wherein each pitched region provides for a different amount of rotation with respect to a proximal movement of said dose setting knob, which results in different dosage increments in each pitched region of said dose setting knob,whereby said dose setting knob causes said lead screw to move distally in said pen body assembly a distance corresponding to a selected pitched region of said groove and a selected dosage indicia in the selected pitched region when said dose setting knob is pushed in a distal direction.
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Abstract
A medication delivery pen is provided having a pen body assembly and a cartridge assembly that are threadedly engageable with one another. The pen body assembly includes a rotatable driver for driving a cartridge plunger preselected distances that are in accordance with a desired dose of medication to be delivered. The driver providing different preset rates of injection.
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Citations
8 Claims
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1. A medication delivery pen comprising:
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a medication-containing cartridge assembly having a cartridge with a pierceably sealed distal end, an open proximal end having an array of threads, and a plunger in sliding fluid tight engagement within said cartridge at a location distally of said array of threads; and a pen body assembly having; a housing with opposed proximal and distal ends, said proximal end having a projection therein and said distal end having an array of threads dimensioned and pitched for threaded engagement with said threads at said proximal end of said cartridge assembly; a lead screw having a proximal end slidably mounted within said housing, a distal end projecting beyond said distal end of said housing for selective engagement with said plunger, and threads extending between said proximal and distal ends of said lead screw; and a rotatable dose setting knob having a groove for receiving said projection and a plurality of dosage indicia for a predefined range of dosage increments, said groove having at least two differently pitched regions, wherein each pitched region provides for a different amount of rotation with respect to a proximal movement of said dose setting knob, which results in different dosage increments in each pitched region of said dose setting knob, whereby said dose setting knob causes said lead screw to move distally in said pen body assembly a distance corresponding to a selected pitched region of said groove and a selected dosage indicia in the selected pitched region when said dose setting knob is pushed in a distal direction. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medication delivery pen comprising:
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a medication-containing cartridge assembly having opposed proximal and distal ends, an elongate medication-containing cartridge mounted in said cartridge assembly, said cartridge having a sealed distal end, a plunger slidably disposed in fluid tight engagement in said cartridge, medication disposed in said cartridge, said proximal end of said cartridge assembly defining an array of threads; and a pen body assembly having; a pen body housing with opposed proximal and distal ends, said proximal end of said pen body housing having a projection therein and said distal end of said pen body housing having an array of threads defining a pitch for threaded engagement with said threads at said proximal end of any of said cartridge assembly; a driver selectively movable in proximal and distal directions in said pen body housing; a rotatable dose setting knob having a groove for receiving said projection and a plurality of dosage indicia for a predefined range of dosage increments, said groove having at least two differently pitched regions, wherein each pitched region provides for a different amount of rotation with respect to a proximal movement of said dose setting knob, which results in different dosage increments in each pitched region of said dose setting knob, whereby said dose setting knob causes said driver to move distally in said pen body assembly a distance corresponding to a selected pitched region of said groove and a selected dosage indicia in the selected pitched region when said dose setting knob is pushed in a distal direction; and a lead screw having opposed proximal and distal ends, said distal end of said lead screw being selectively engageable with the plunger of any of said cartridge assemblies, said lead screw further comprising an array of external threads thereon threadedly engaged for rotation in said pen body housing, said threads on said lead screw defining a pitch substantially identical to said pitch of said threads on said distal end of said pen body housing, said lead screw being axially movable in said pen body housing in response to movement of said driver for selectively advancing said lead screw distances from said pen body housing corresponding to selected doses of medication, whereby the substantially identical pitches of said threads on said lead screw and on said pen body housing enables said lead screw to move in said pen body housing simultaneously with threaded engagement of said pen body housing with said cartridge assembly.
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Specification