Drug delivery device last dose lock-out mechanism
First Claim
1. A dose setting mechanism for a drug delivery device, wherein the dose setting mechanism is operable to be coupled to a cartridge housing of the drug delivery device configured to house a cartridge of medication, the dose setting mechanism comprising:
- a last dose lock-out mechanism preventing a user of said dose setting mechanism from setting a dose of said medication that is greater than said medication in said cartridge, said lock-out mechanism comprising;
a dose setting mechanism housing;
a rotatable shaft;
a helical groove having a first pitch provided along a first portion of said rotatable shaft and a second pitch provided along a second portion of said rotatable shaft, said first pitch different from said second pitch; and
a non-rotating member disposed between said dose setting mechanism housing and said helical groove of said shaft,wherein during dose setting of said drug delivery device, said shaft is rotated relative to said non-rotating member and moves axially with respect to said dose setting mechanism housing, while said non-rotating member traverses along said groove from a first end of said shaft towards a second end of said shaft,wherein said non-rotating member traverses along said groove until a dose greater than said medication remaining in said cartridge is selected and said non-rotating member prevents said shaft from rotating and increasing said dose, andwherein said non-rotating member comprises at least one substantially radial stop face, said at least one substantially radial stop face engaging at least one stop face on said rotatable shaft so that said non-rotating member prevents said shaft from rotating.
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Accused Products
Abstract
A method and system for limiting a maximum dose that may be set in a drug delivery device. A dose setting mechanism, which is operable to be coupled to a medication cartridge, comprises a lock-out mechanism that prevents one from setting a dose greater than the medication in the cartridge. The lock-out mechanism comprises a rotatable shaft. A helical groove having a first pitch is provided along a first portion of the rotatable shaft and a second pitch provided along a second portion of the rotatable shaft. The first pitch is different from the second pitch. A third pitch may be provided on a third portion of the shaft. This third pitch is provided at the end of the second pitch and is preferably different than the second pitch. The lock-out mechanism further comprises a non-rotating member disposed on the helical groove of said shaft. During dose setting, the shaft is rotated relative to the non-rotating member while the non-rotating member traverses along the groove from a proximal end of the shaft towards a distal end of the shaft.
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Citations
21 Claims
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1. A dose setting mechanism for a drug delivery device, wherein the dose setting mechanism is operable to be coupled to a cartridge housing of the drug delivery device configured to house a cartridge of medication, the dose setting mechanism comprising:
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a last dose lock-out mechanism preventing a user of said dose setting mechanism from setting a dose of said medication that is greater than said medication in said cartridge, said lock-out mechanism comprising; a dose setting mechanism housing; a rotatable shaft; a helical groove having a first pitch provided along a first portion of said rotatable shaft and a second pitch provided along a second portion of said rotatable shaft, said first pitch different from said second pitch; and a non-rotating member disposed between said dose setting mechanism housing and said helical groove of said shaft, wherein during dose setting of said drug delivery device, said shaft is rotated relative to said non-rotating member and moves axially with respect to said dose setting mechanism housing, while said non-rotating member traverses along said groove from a first end of said shaft towards a second end of said shaft, wherein said non-rotating member traverses along said groove until a dose greater than said medication remaining in said cartridge is selected and said non-rotating member prevents said shaft from rotating and increasing said dose, and wherein said non-rotating member comprises at least one substantially radial stop face, said at least one substantially radial stop face engaging at least one stop face on said rotatable shaft so that said non-rotating member prevents said shaft from rotating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification