Dose measurement system and method
First Claim
1. A method of estimating a volume of liquid in a drug container, the method comprising:
- causing a plurality of light sources to emit electromagnetic radiation toward the drug container;
detecting the electromagnetic radiation emitted by at least two of the plurality of light sources;
generating a signal signature representative of the detected electromagnetic radiation; and
comparing the signal signature to a plurality of reference signatures to determine the volume of liquid in the drug container.
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Accused Products
Abstract
Embodiments described herein generally relate to devices, systems and methods for measuring the dose remaining in a drug delivery device that is used for delivering a dose to a patient. In some embodiments, a dose measurement system for measuring the liquid volume in a container includes a plurality of light sources which are disposed and configured to emit electromagnetic radiation toward the container. A plurality of sensors are located in the apparatus that are optically coupleable to the plurality of light sources and are disposed and configured to detect the electromagnetic radiation emitted by at least a portion of the light sources. The apparatus also includes a processing unit configured to receive data representing the portion of the detected electromagnetic radiation from each of the plurality of sensors. The processing unit is further operable to convert the received data into a signature representative of the electromagnetic radiation detected by the plurality of sensors.
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Citations
20 Claims
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1. A method of estimating a volume of liquid in a drug container, the method comprising:
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causing a plurality of light sources to emit electromagnetic radiation toward the drug container; detecting the electromagnetic radiation emitted by at least two of the plurality of light sources; generating a signal signature representative of the detected electromagnetic radiation; and comparing the signal signature to a plurality of reference signatures to determine the volume of liquid in the drug container. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10)
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3. A method, comprising:
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causing a plurality of light sources to emit electromagnetic radiation toward an injection pen a first time; detecting the electromagnetic radiation emitted by at least two of the plurality of light sources with a plurality of sensors at the first time; generating a first signal signature representative of the detected electromagnetic radiation; comparing the first signal signature to a plurality of reference signatures to determine a first volume of liquid in the injection pen; causing the plurality of light sources to emit electromagnetic radiation toward the injection pen a second time after the first time; detecting the electromagnetic radiation emitted by at least two of the plurality of light sources with the plurality of sensors at the second time generating a second signal signature representative of the detected electromagnetic radiation; comparing the second signal signature to the plurality of reference signatures to determine a second volume of liquid in the injection pen; and estimating a dose delivered from the injection pen based on the first volume and the second volume. - View Dependent Claims (4, 11, 12, 13)
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14. A method of estimating a volume of liquid in a drug container, the method comprising:
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causing a plurality of light sources to emit electromagnetic radiation toward the drug container; detecting the electromagnetic radiation emitted by at least two of the plurality of light sources; generating a signal signature representative of the detected electromagnetic radiation; and comparing the signal signature to a plurality of reference signatures to determine the a property of the drug container. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification