Drive mechanisms suitable for use in drug delivery devices
First Claim
1. A drive mechanism for use in a drug delivery device comprising:
- a housing;
a dose dial sleeve having a helical thread of a first lead; and
a two-part piston rod;
characterised in that the two-part piston rod comprises an outer part having a helical thread of a second lead and an inner part having a helical thread of a third lead, whereby the first lead of the thread of the dose dial sleeve is equal to the sum of the second lead of the thread of the outer part of the piston rod and the third lead of the thread of the inner part of the piston rod.
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Accused Products
Abstract
A drive mechanism suitable for use in drug delivery devices is disclosed. The drive mechanism may be used with injector-type drug delivery devices, such as those permitting a user to set the delivery dose. The drive mechanism may include a housing, a dose dial sleeve having a helical thread of a first lead, and a two-part piston rod. The two-part piston rod may include an outer part having a helical thread of a second lead and an inner part having a helical thread of a third lead. In such an embodiment, the first lead of the thread of the dose dial sleeve may be equal to the sum of the second lead of the thread of the outer part of the piston rod and the third lead of the thread of the inner part of the piston rod.
106 Citations
18 Claims
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1. A drive mechanism for use in a drug delivery device comprising:
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a housing; a dose dial sleeve having a helical thread of a first lead; and a two-part piston rod;
characterised in that the two-part piston rod comprises an outer part having a helical thread of a second lead and an inner part having a helical thread of a third lead, whereby the first lead of the thread of the dose dial sleeve is equal to the sum of the second lead of the thread of the outer part of the piston rod and the third lead of the thread of the inner part of the piston rod. - View Dependent Claims (2)
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3. An assembly for use in a drug delivery device comprising a drive mechanism including:
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a housing; a dose dial sleeve having a helical thread of a first lead; and a two-part piston rod;
characterised in that the two-part piston rod comprises an outer part having a helical thread of a second lead and an inner part having a helical thread of a third lead, whereby the first lead of the thread of the dose dial sleeve is equal to the sum of the second lead of the thread of the outer part of the piston rod and the third lead of the thread of the inner part of the piston rod. - View Dependent Claims (4)
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5. A drug delivery device comprising a drive mechanism comprising:
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a housing; a dose dial sleeve having a helical thread of a first lead; and a two-part piston rod;
characterised in that the two-part piston rod comprises an outer part having a helical thread of a second lead and an inner part having a helical thread of a third lead, whereby the first lead of the thread of the dose dial sleeve is equal to the sum of the second lead of the thread of the outer part of the piston rod and the third lead of the thread of the inner part of the piston rod. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A drug delivery device comprising an assembly, the assembly including a drive mechanism including:
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a housing; a dose dial sleeve having a helical thread of a first lead; and a two-part piston rod;
characterised in that the two-part piston rod comprises an outer part having a helical thread of a second lead and an inner part having a helical thread of a third lead, whereby the first lead of the thread of the dose dial sleeve is equal to the sum of the second lead of the thread of the outer part of the piston rod and the third lead of the thread of the inner part of the piston rod. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification