Medication delivery pen
First Claim
Patent Images
1. A medication delivery pen comprising:
- a housing comprising a distal end and a proximal end;
a cartridge retainer for receiving a cartridge containing medication, said cartridge retainer being removably mountable on the distal end of said housing;
means in said housing for setting a desired dose of medication to be dispensed from the cartridge;
means in said housing for dispensing the desired dose of medication from the cartridge, said dispensing means having a loading position for loading and unloading the cartridge from said cartridge retainer and a delivery position for dispensing medication from the cartridge; and
means in said housing for preventing the removal of said cartridge retainer from said housing when said dispensing means is in the delivery position,wherein said means for preventing removal of said cartridge retainer from said housing comprises;
a locking sleeve having a distal end and a proximal end having a L-shaped groove;
a locking ring having a pair of tabs extending from a distal end and a proximal end slidably attached to the distal end or said locking sleeve; and
a pair of half-nuts having internal threads and connected together at a proximal end by a pivot shaft on each of said half-nuts, said pivot shaft traveling within said L-shaped groove of said locking sleeve as said dispensing means moves from the delivery position to the loading position.
1 Assignment
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Accused Products
Abstract
An improved medication delivery pen is provided for injecting fluids such as insulin within body tissue. The medication delivery pen includes a mechanism that prevents the removal of a cartridge unless an injector button on the medication pen is in a predefined position, a bayonet attachment and an improved clutch assembly in a dose setting mechanism that provides improved control over the torque necessary to rotate a units counter ring in the medication delivery pen using a dose setting knob.
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Citations
8 Claims
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1. A medication delivery pen comprising:
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a housing comprising a distal end and a proximal end; a cartridge retainer for receiving a cartridge containing medication, said cartridge retainer being removably mountable on the distal end of said housing; means in said housing for setting a desired dose of medication to be dispensed from the cartridge; means in said housing for dispensing the desired dose of medication from the cartridge, said dispensing means having a loading position for loading and unloading the cartridge from said cartridge retainer and a delivery position for dispensing medication from the cartridge; and means in said housing for preventing the removal of said cartridge retainer from said housing when said dispensing means is in the delivery position, wherein said means for preventing removal of said cartridge retainer from said housing comprises; a locking sleeve having a distal end and a proximal end having a L-shaped groove; a locking ring having a pair of tabs extending from a distal end and a proximal end slidably attached to the distal end or said locking sleeve; and a pair of half-nuts having internal threads and connected together at a proximal end by a pivot shaft on each of said half-nuts, said pivot shaft traveling within said L-shaped groove of said locking sleeve as said dispensing means moves from the delivery position to the loading position. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medication delivery pen comprising:
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a housing comprising a distal end and a proximal end; a cartridge retainer for receiving a cartridge containing medication, said cartridge retainer being removably mountable on the distal end of said housing; means in said housing for setting a desired dose of medication to be dispensed from the cartridge; means in said housing for dispensing the desired dose of medication from the cartridge, said dispensing means having a loading position for loading and unloading the cartridge from said cartridge retainer and a delivery position for dispensing medication from the cartridge; and means in said housing for preventing the removal of said cartridge retainer from said housing when said dispensing means is in the delivery position, wherein said dispensing means includes a lead screw having a thread and a pair of half-nuts having internal threads, said half-nuts being hingably connected together at a pivot shaft on each of said half-nuts such that said threads in said half-nuts threadably engage the thread on said lead screw within the medication delivery pen when said dispensing means is in the delivery position and rotate away from the thread on said lead screw when said dispensing means is in the loading position.
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Specification