Medication delivery pen having an improved clutch assembly
First Claim
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1. A medication delivery pen comprising:
- a housing having 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 having a rotatable dose setting knob and a dosing ring that displays the amount of the desired dose being set;
means in said housing for dispensing the desired dose of medication from the cartridge; and
means in said dose setting means for controlling torque applied by said rotatable dose setting knob to said dosing ring during rotation of said dosing knob including a clutch having a clutch detent spring attached to said dosing ring and rotatable mounted to said dose setting knob to rotate within said dose setting knob when a predetermined torque is applied to said dose setting knob.
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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
7 Claims
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1. A medication delivery pen comprising:
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a housing having 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 having a rotatable dose setting knob and a dosing ring that displays the amount of the desired dose being set; means in said housing for dispensing the desired dose of medication from the cartridge; and means in said dose setting means for controlling torque applied by said rotatable dose setting knob to said dosing ring during rotation of said dosing knob including a clutch having a clutch detent spring attached to said dosing ring and rotatable mounted to said dose setting knob to rotate within said dose setting knob when a predetermined torque is applied to said dose setting knob. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification