Shaily Engineering Plastics Limited

Gamida Tech

Stephen Knowles

Simon Collings

Michal Uhman

An injector pen is provided that includes a cartridge housing, a dose selector housingand a nutfor coupling the two housingstogether. The dose selector housingdefines an intermediate axial position, where the nutcan be temporarily retained in the dose selector housingto form a sub-assembly suitable for transport to a different location. During final assembly of the injector pen, the cartridge housingsecurely engages with the nutand displaces the nutfrom the intermediate axial position to a final axial position.

Injector pen assembly

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.

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Datchet, United Kingdom

Stephen Knowles