Dose measurement system and method
First Claim
1. A method of estimating volume of liquid ejected from a drug container, the method comprising:
- detecting electromagnetic radiation emitted by at least two of a plurality light sources with each of a plurality of sensors, the plurality of light sources emitting electromagnetic radiation toward the drug container, the drug container including an actuator;
generating a signal signature representative of the electromagnetic radiation detected through the drug container by the plurality of sensors;
comparing the signal signature to a plurality of reference signatures to determine a displacement of a plunger portion of the actuator; and
determining the volume of the liquid ejected from the drug container based on the displacement of the plunger portion of the actuator.
2 Assignments
0 Petitions
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
16 Claims
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1. A method of estimating volume of liquid ejected from a drug container, the method comprising:
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detecting electromagnetic radiation emitted by at least two of a plurality light sources with each of a plurality of sensors, the plurality of light sources emitting electromagnetic radiation toward the drug container, the drug container including an actuator; generating a signal signature representative of the electromagnetic radiation detected through the drug container by the plurality of sensors; comparing the signal signature to a plurality of reference signatures to determine a displacement of a plunger portion of the actuator; and determining the volume of the liquid ejected from the drug container based on the displacement of the plunger portion of the actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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causing at least two of a plurality of wide angle light sources to emit electromagnetic radiation toward a drug container in a dose measurement system; detecting the electromagnetic radiation emitted by the at least two wide angle light sources with each of a plurality of sensors; and generating a signal signature representative of the electromagnetic radiation detected through the drug container by the plurality of sensors. - View Dependent Claims (9, 10, 11, 12)
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13. A method of estimating a volume of liquid in a drug container, the method comprising:
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detecting electromagnetic radiation emitted by at least two of a plurality of light sources with each of a plurality of sensors, the plurality of light sources emitting electromagnetic radiation toward the drug container; generating a signal signature representative of the electromagnetic radiation detected through the drug container by the plurality of sensors; and comparing the signal signature to a plurality of reference signatures to determine the volume of liquid in the drug container. - View Dependent Claims (14, 15, 16)
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Specification