Pen-type injector
AssigneeSanofi-Aventis Deutschland GmbH
InventorsRobert Frederick Veasey, Robert Perkins, David Aubrey Plumptre
Life of this patent
Estimating the term…
Abstract
The present invention relates to injectors, such as pen-type injectors, that provide for administration of medicinal products from a multidose-cartridge and permit a user to set the delivery dose. The injector may include a housing, a piston rod adapted to operate through the housing, a dose dial sleeve located between the housing and the piston rod, and a drive sleeve located between the dose dial sleeve and the piston rod. The dose dial sleeve may have a helical thread of first lead and the drive sleeve may have a helical groove of second lead. The first lead of the helical thread and the second lead of the helical groove may be the same.
Claims10
A drive mechanism for use in a drug delivery device comprising:
- a housing having a longitudinal axis and comprising an inner surface with an insert that is rotationally and axially fixed relative to the housing;
- a piston rod positioned and aligned with the longitudinal axis having a first thread on a first end that is engaged with the insert;
- and
- a drive sleeve that extends about the piston rod and has internal and outer surfaces, where the internal surface is engaged with the piston rod;
- wherein longitudinal axial movement of the drive sleeve causes the piston rod to rotate through the insert relative to the housing.
Dependencies are inferred from the claim text.