Spindle for a drug delivery device
First Claim
1. A dose setting mechanism for use with a drug delivery device comprising a housing, a clutch, a number sleeve, an inner housing, a spindle for driving a bung of a cartridge and further comprising a driver for driving said spindle, which extends about the spindle, with said driver comprising a helical groove form that engages a first helical groove of said spindle,said spindle comprising:
- a generally circular shaft having an outer surface, said generally circular shaft extending from a distal end to a proximal end of said circular shaft;
a first helical groove provided along a first portion of said outer surface of said generally circular shaft, said first helical groove having a first pitch; and
a second helical groove provided along a second portion of said outer surface of said generally circular shaft, said second helical groove overlapping said first helical groove, said second helical groove having a second pitch;
wherein the number sleeve is in rotatable engagement with respect to said housing;
wherein the driver is releasably coupled to said number sleeve with the clutch disposed about the driver between the driver and the number sleeve; and
wherein the spindle is operatively coupled to said driver, such that when a user sets a dose by rotating said number sleeve, said driver also rotates,wherein the inner housing fits between the clutch and the number sleeve.
1 Assignment
0 Petitions
Accused Products
Abstract
A spindle (242; 414; 542; 642) for driving a bung of a cartridge is provided. The spindle includes a generally circular shaft having an outer surface (560). The generally circular shaft extends from a distal end to a proximal end of said circular shaft. A first helical groove (219; 519; 619) is provided along a first portion of the outer surface. The first helical groove having a first pitch. A second helical groove (221; 521; 621) provided along a second portion of the outer surface of the generally circular shaft. The second helical groove overlapping the first helical groove. The second helical groove having a second pitch.
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Citations
15 Claims
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1. A dose setting mechanism for use with a drug delivery device comprising a housing, a clutch, a number sleeve, an inner housing, a spindle for driving a bung of a cartridge and further comprising a driver for driving said spindle, which extends about the spindle, with said driver comprising a helical groove form that engages a first helical groove of said spindle,
said spindle comprising: -
a generally circular shaft having an outer surface, said generally circular shaft extending from a distal end to a proximal end of said circular shaft; a first helical groove provided along a first portion of said outer surface of said generally circular shaft, said first helical groove having a first pitch; and a second helical groove provided along a second portion of said outer surface of said generally circular shaft, said second helical groove overlapping said first helical groove, said second helical groove having a second pitch; wherein the number sleeve is in rotatable engagement with respect to said housing; wherein the driver is releasably coupled to said number sleeve with the clutch disposed about the driver between the driver and the number sleeve; and wherein the spindle is operatively coupled to said driver, such that when a user sets a dose by rotating said number sleeve, said driver also rotates, wherein the inner housing fits between the clutch and the number sleeve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification