The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2025
Filed:
Dec. 03, 2020
Novo Nordisk A/s, Bagsvaerd, DK;
Nikolaj Eusebius Jakobsen, Soeborg, DK;
Novo Nordisk A/S, Bagsvaerd, DK;
Abstract
The present invention provides a piston rod displacement mechanism for a pen injection device, comprising: a tubular housing () extending along a reference axis and comprising an interior housing surface () with a first engagement structure (), a nut member () fixed within the tubular housing (), a piston rod () comprising a first non-self-locking thread () having a first thread direction and a first thread pitch and being engaged with the nut member (), and a second non-self-locking thread () superposed on the first non-self-locking thread (), the second non-self-locking thread () having a second thread direction and a second thread pitch, and a dose dial sleeve () operable to advance the piston rod () in the nut member (), the dose dial sleeve () comprising an exterior sleeve surface () with a second engagement structure () being in sliding engagement with the first engagement structure (), and an interior sleeve surface () with a third engagement structure () being engaged with the second non-self-locking thread (). One of the first engagement structure () and the second engagement structure () comprises a closed-circuit track configuration and the other of the first engagement structure and the second engagement structure comprises a track follower, and the closed-circuit track configuration comprises a helical track portion () having a helical track direction equaling the second thread direction and a helical track pitch equaling the second thread pitch, and an axial track portion () extending between a distal track end () and a proximal track end () and being connected to the helical track portion () at the distal track end ().