Accessory device with zero position adjustment feature

Abstract

An add-on device configured to be releasably attached to a drug delivery device comprises a housing with a reference marker and a scale drum with a zero identifier and an initial marker. The add-on device comprises a memory and a camera adapted to capture an image of the housing reference marker and the initial marker when the scale drum is in a (near) initial position. The add-on device is adapted to perform a reference offset value determination, comprising: capturing an image, performing an image analysis to determine if the captured image comprises the zero identifier, if so, determining areference offset value based on the distance between the housing reference marker and the initial marker, the reference off-set value representing the initial rotational position, and if no referenceoffset value is stored in the memory or if the determined reference offset value corresponds to a smaller set dose amount than a currently stored value, storing in the memory the determined referenceoffset value.

Description

technical field [0001] The present invention generally relates to medical devices related to the generation, collection and storage of data. In particular embodiments, the present invention relates to devices and systems for capturing drug delivery dose data in a reliable and efficient manner. Background technique [0002] In the disclosure of the present invention, reference is mainly made to drug delivery devices comprising a threaded piston rod driven by a rotary drive member, such devices being used for example for the treatment of diabetes by delivering insulin, however, this is only the subject of the present invention Exemplary use. [0003] Drug injection devices have greatly improved the lives of patients who must self-administer drugs and biologics. Drug injection devices can take a variety of forms including: simple disposable devices, which are simply ampoules with an injection mechanism; or they can be durable devices suitable for use with pre-filled cartridge...

AI Technical Summary

Problems solved by technology

Since any given drug delivery device is manufactured with tolerances for each component, the scale drum dose size indication accuracy will also potentially vary for each device, for example, for any given set dose, the corresponding The scale drum markings (eg, line markings) may not be perfectly aligned with the housing pointer structure, potentially causing inaccuracies when determining the scale drum position and thus erroneous determination of the expelled dose size

Images