| CPC A61M 5/31546 (2013.01) [A61B 5/0004 (2013.01); A61B 5/14532 (2013.01); A61B 5/4836 (2013.01); A61B 5/4839 (2013.01); A61B 5/7405 (2013.01); A61B 5/7435 (2013.01); A61B 5/7455 (2013.01); A61B 5/746 (2013.01); A61K 38/28 (2013.01); A61M 5/003 (2013.01); A61M 5/168 (2013.01); A61M 5/20 (2013.01); A61M 5/31525 (2013.01); A61M 5/3202 (2013.01); G16H 20/13 (2018.01); G16H 20/17 (2018.01); G16H 20/60 (2018.01); G16H 40/63 (2018.01); G16H 40/67 (2018.01); G16H 50/20 (2018.01); G16H 50/30 (2018.01); A61B 5/14546 (2013.01); A61B 5/681 (2013.01); A61M 2005/14208 (2013.01); A61M 2005/2006 (2013.01); A61M 5/24 (2013.01); A61M 2005/3125 (2013.01); A61M 2205/18 (2013.01); A61M 2205/3306 (2013.01); A61M 2205/3561 (2013.01); A61M 2205/3584 (2013.01); A61M 2205/502 (2013.01); A61M 2205/505 (2013.01); A61M 2205/581 (2013.01); A61M 2205/582 (2013.01); A61M 2205/583 (2013.01); A61M 2209/06 (2013.01); A61M 2230/201 (2013.01)] | 62 Claims |

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1. An accessory for an insulin pen, the accessory comprising:
at least one user interface to display a time since at least one of a capping or decapping of the accessory via one or more indicators; and
a controller comprising:
at least one processor; and
at least one non-transitory computer-readable storage medium storing instructions thereon that, when executed by the at least one processor, cause the controller to:
detect at least one of a capping or a decapping of the accessory from an insulin pen; and
responsive to the accessory being capped on or uncapped from the insulin pen, determine a missed dose.
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