Spindle for a drug delivery device
First Claim
Patent Images
1. A dose setting mechanism for use with a drug delivery device, said dose setting mechanism comprising:
- a housing insert comprising a helical groove form;
a spindle for driving a bung of a cartridge, said spindle comprising;
a generally circular shaft having an outer surface;
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, and said second helical groove engaging the helical groove form of the housing insert; and
a driver for driving said spindle, said driver comprising a helical groove form that engages said first helical groove provided along said first portion of said outer surface of said generally circular shaft of said spindle,wherein a longitudinal axial movement of the driver causes the spindle to rotate, andwherein the driver is prevented from rotating with respect to a drug delivery device housing during dispensing a dose.
1 Assignment
0 Petitions
Accused Products
Abstract
A spindle for driving a bung of a cartridge. The spindle includes a generally circular shaft having an outer surface. The generally circular shaft extends from a distal end to a proximal end of said circular shaft. A first helical groove is provided along a first portion of the outer surface. The first helical groove having a first pitch. A second helical groove 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.
-
Citations
24 Claims
-
1. A dose setting mechanism for use with a drug delivery device, said dose setting mechanism comprising:
-
a housing insert comprising a helical groove form; a spindle for driving a bung of a cartridge, said spindle comprising; a generally circular shaft having an outer surface; 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, and said second helical groove engaging the helical groove form of the housing insert; and a driver for driving said spindle, said driver comprising a helical groove form that engages said first helical groove provided along said first portion of said outer surface of said generally circular shaft of said spindle, wherein a longitudinal axial movement of the driver causes the spindle to rotate, and wherein the driver is prevented from rotating with respect to a drug delivery device housing during dispensing a dose. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
Specification