Patent ID: 8556866
Filing Date: 2013-10-15
Classification: A61B,A61M,G01D,G16H

Abstract:
1. A drug delivery system comprising: a drug delivery pen having a generally tubular pen housing that extends from a first end to a second end, the first end of the pen housing enclosing at least a portion of a plunger rod coupled to a drug cartridge disposed proximate the second end of the pen housing, the first end of the pen housing having a dosage selector coupled to the plunger rod; an add-on module housing extending along a first longitudinal axis from a first add-on module housing end to a second add-on module housing end, the add-on module housing including first and second extensions that partially circumscribe a portion of the first end of the pen housing for attachment of the add-on module housing to the drug delivery pen; and a dosage sensor coupled to the add-on module housing and located on one side of the first longitudinal axis, in which the dosage sensor includes a longitudinal member movable along the longitudinal axis, the longitudinal member connected to a follower portion that extends from the add-on module housing proximate the second add-on module housing end; a power source coupled to the add-on module housing, located on another side of the first longitudinal axis and spaced apart from the dosage sensor; and a micro-controller disposed in the add-on module housing proximate the first longitudinal axis and located between dosage sensor and the power source.