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US 5,827,232 AGranted
Quick connect medication delivery pen
AssigneeBecton, Dickinson and Company
InventorsLawrence H. Chanoch, John B. Wilson
Life of this patent
Estimating the term…
Abstract
A medication delivery pen is provided having a reusable pen body assembly and a disposable cartridge assembly that are threadedly engageable with one another. The disposable cartridge assembly includes a plunger and can releasably receive a needle cannula assembly. A portion of the pen body assembly projects into the cartridge holder assembly for driving the cartridge plunger distances that are selected in accordance with a desired dose of medication to be delivered. The cartridge holder assembly can be disassembled from the pen body assembly after the medication therein has been exhausted, and the used cartridge holder assembly may be discarded and replaced.
Claims7
A medication delivery pen comprising:
- a disposable medication-containing cartridge assembly having:
- a cartridge with a pierceably sealed distal end and a plunger in sliding fluid tight engagement therein to dispense medication from said cartridge when said plunger slides in a distal direction;
- a tab mounted within said cartridge assembly;
- and
- an open proximal end having an array of threads located between said open proximal end and said tab, said tab being located near a distal end of said array of threads;
- and
- a reusable pen body assembly having:
- a housing with opposed proximal and distal ends, said distal end having an array of threads dimensioned and having a pitch for threaded engagement with said array of threads at said proximal end of said cartridge assembly;
- a lead screw having a proximal end disposed in said housing and a distal end projecting beyond said distal end of said housing for selective engagement with said plunger to push said plunger in said distal direction, said lead screw having an array of threads extending between said proximal end and said distal end of said lead screw and having a pitch substantially equal to said pitch of said array of threads at said distal end of said pen body assembly and at least one anti-rotation groove extending axially along said lead screw for receiving said tab on said cartridge assembly when said cartridge assembly is threaded onto said housing of said pen body to prevent relative rotation between said lead screw and said cartridge assembly, with said lead screw being free to rotate and move in the proximal direction prior to said cartridge assembly being threaded onto said housing of said pen body;
- and
- driver means for moving said lead screw distally in said pen body assembly selected amounts.
8 more elements
A reusable medication delivery pen system comprising:
- a disposable cartridge holder assembly including:
- an elongate cartridge housing having opposed proximal and distal ends, a tab mounted therein and said proximal end having an array of threads located between said proximal end and said tab, said tab being located near a distal end of said array of threads;
- an elongate medication-containing cartridge mounted in said cartridge housing, said cartridge having:
- a seal located at a distal end;
- an open proximal end;
- a plunger slidably disposed in fluid tight engagement therein;
- and
- medication disposed therein between said plunger and said seal;
- and
- a reusable pen body assembly having:
- a pen body housing with opposed proximal and distal ends, said distal end of said pen body housing having an array of threads having a pitch for threaded engagement with said array of threads at said proximal end of said cartridge housing;
- a driver selectively movable in proximal and distal directions in said pen body housing;
- and
- dose setting means selectively adjustable for controlling amounts of movement of said driver;
- and
- a lead screw having opposed proximal and distal ends, said distal end of said lead screw being selectively engageable with said plunger of said cartridge holder assembly, said lead screw further comprising an array of external threads thereon threadedly engaged for rotation in said pen body housing, said array of external threads on said lead screw having a pitch substantially identical to said pitch of said array of 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 distal end of said lead screw distances from said distal end of said pen body housing corresponding to selected doses of medication, said lead screw also including a longitudinally extending groove therein for receiving said tab on said cartridge housing when said cartridge housing is threaded onto said pen body housing to prevent relative rotation between said lead screw and said cartridge housing, with said lead screw being free to rotate and move in the proximal direction prior to said cartridge housing being threaded onto said pen body housing.
13 more elements
Dependencies are inferred from the claim text.