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A medication injector apparatus such as an injection pen. The injection pen may include a doseable quantity identifier that uses a rotational matrix and a sensor for electrically sensing the arrangement of the dose setting mechanism of the the pen, which identifier may be part of a therapeutic dose

A medication injector apparatus such as an injection pen. The injection pen may include a doseable quantity identifier that uses a rotational matrix and a sensor for electrically sensing the arrangement of the dose setting mechanism of the the pen, which identifier may be part of a therapeutic dose indicating system that utilizes a cartridge recognizer to recognize a concentration of medication so as to allow an automatic determination of a therapeutic dose.

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1. A doseable quantity identifier for a medication injector apparatus having a dose setting mechanism operable to select a volume of medicine to be delivered from a held cartridge, comprising: a rotational matrix disposed on a first component of the apparatus;a sensor for electrically sensing the ro

1. A doseable quantity identifier for a medication injector apparatus having a dose setting mechanism operable to select a volume of medicine to be delivered from a held cartridge, comprising: a rotational matrix disposed on a first component of the apparatus;a sensor for electrically sensing the rotational matrix, said sensor disposed on a second component of the apparatus which experiences rotational motion relative to the first component during operation of the dose setting mechanism;whereby data of said rotational matrix sensible by said sensor is thereby indicative of an arrangement of the dose setting mechanism;a controller circuited with said sensor which interprets data of said rotational matrix sensed by said sensor to determine a quantity of medicine to be delivered from the cartridge during injection; anda visible display that displays the quantity of medicine to be delivered as determined by said controller;wherein said rotational matrix includes a plurality of rows and a plurality of columns, wherein said sensor includes a plurality of electrical contacts, each of said contacts aligned with a different row of said rotational matrix, wherein said data of said rotational matrix is in the form of the presence or absence of an electrically conductive material at intersections of said rows and columns of said rotational matrix, and wherein said plurality of electrical contacts and said rotational matrix are cooperatively configured such that when the first and second components are relatively rotationally shifted from a first rotational position, a change in data of said rotational matrix sensed by any single electrical contact does not produce a pattern corresponding to a rotational position that is within a range of rotational positions in either direction away from the first rotational position, said range being inclusively between two and at least three positions. 2. The doseable quantity identifier of claim 1 wherein said at least three positions is six positions. 3. A doseable quantity identifier for a medication injector apparatus having a dose setting mechanism operable to select a volume of medicine to be delivered from a held cartridge, comprising: a rotational matrix disposed on a first component of the apparatus;a sensor for electrically sensing the rotational matrix, said sensor disposed on a second component of the apparatus which experiences rotational motion relative to the first component during operation of the dose setting mechanism;whereby data of said rotational matrix sensible by said sensor is thereby indicative of an arrangement of the dose setting mechanism;a controller circuited with said sensor which interprets data of said rotational matrix sensed by said sensor to determine a quantity of medicine to be delivered from the cartridge during injection; anda visible display that displays the quantity of medicine to be delivered as determined by said controller;wherein said rotational matrix includes a plurality of rows and a plurality of columns, wherein said sensor includes a plurality of electrical contacts, each of said contacts aligned with a different row of said rotational matrix, wherein said data of said rotational matrix is in the form of the presence or absence of an electrically conductive material at intersections of said rows and columns of said rotational matrix, and wherein said plurality of electrical contacts and said rotational matrix are cooperatively configured such that data of said rotational matrix of each column of said rotational matrix is not unique, and wherein said controller is adapted to identify the correct relative rotational positioning of the first and second components based upon a previous valid positioning thereof and a range of positions adjacent to said previous valid positioning on either side.