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. 01, 2021
Filed:
Apr. 12, 2019
Shaily Engineering Plastics Limited, Gujarat, IN;
Stephen Knowles, Datchet, GB;
Michal Uhman, Datchet, GB;
Shaily Engineering Plastics Limited, Gujarat, IN;
Abstract
A fixed dose injector pen is provided that includes a transmission element that is rotated to set and deliver a dose of a drug from a multi-dose cartridge. A circular ratchet defines a small number of engagement positions around its circumference and selectively transmits the rotation of the transmission element to a piston rod driver. The circular ratchet transmits the rotation of the transmission element to the piston rod driver only when the transmission element is rotated in a dose delivery direction, and only if the transmission element has previously been rotated in an opposite, dose setting direction through an angle sufficient to reach one of the engagement positions. An axially moving injector element can be used to drive rotation of the transmission element via a helical coupling. When the piston rod has advanced to a predetermined axial position, a last dose lock-out mechanism maintains the circular ratchet in engagement.