System and method for sensing usage of a controlled medical therapy device
A nasal spray device can include housing having a sensor and a nozzle having a housing interface with a graphical image thereon. The sensor can be configured to sense movement of the graphical image when the nozzle moves relative to the housing, for instance during administration of medicine from the nasal spray device. The sensor can include an infrared proximity sensor that senses infrared reflectivity from the graphical image. The infrared proximity sensor can also be used to measure distance to a surface of a vial within the housing to thereby detect insertion of the vial into the housing.
1 . A nasal spray device comprising:
a nozzle comprising a conical nozzle portion extending along a longitudinal axis, a housing interface configured to attach to a vial, and a graphical image positioned on an exterior surface of the housing interface; and
a housing comprising a chamber sized to receive the vial, an opening in communication with the chamber, and a sensor directed toward the graphical image, wherein a line of sight from the sensor to the graphical image is approximately tangential to the longitudinal axis,
wherein the housing interface is positioned within the opening and configured to slide through the opening upon movement of the nozzle in relation to the housing, and
wherein the sensor is configured to detect movement of the graphical image and determine a distance of depression of the nozzle upon movement of the nozzle along the longitudinal axis in relation to the housing.
2 . The nasal spray device of claim 1 , wherein the graphical image comprises a printed image upon a label affixed to the exterior surface of the housing interface.
3 . The nasal spray device of claim 1 , wherein the graphical image comprises a print directly applied to the exterior surface of the housing interface.
4 . The nasal spray device of claim 1 , wherein the graphical image comprises a distinct material composition from a majority of the housing interface and is over-molded and/or co-molded with the housing interface.
5 . The nasal spray device of claim 1 , wherein the graphical image comprises black and white features having a high contrast with respect to infrared light reflection.
6 . The nasal spray device of claim 1 , wherein the graphical image comprises interleaved black triangles and white triangles such that bases of the black triangles are aligned on a first end of the graphical image, bases of the white triangles are aligned on a second end of the graphical image, and heights of the white triangles and heights of the black triangles extend along the longitudinal axis.
7 . The nasal spray device of claim 1 , wherein the sensor is configured to measure a position of the nozzle in relation to the housing in a single sample, without requiring comparison to a previous sample.
8 . The nasal spray device of claim 1 , wherein the sensor is configured to measure position of the nozzle in relation to the housing with a measurement error of about 83 micrometers.
9 . The nasal spray device of claim 1 , wherein the sensor is configured with a measurement resolution of about 4 counts per millimeter (mm) to about 815 counts per mm.
10 . The nasal spray device of claim 1 , wherein the sensor is configured with a measurement resolution of about 500 counts per mm.
11 . The nasal spray device of claim 10 , wherein the sensor is configured to operate continuously at 10 samples per second at an average power of about 47 microwatts at the measurement resolution of about 500 counts per mm.
12 . The nasal spray device of claim 1 ,
wherein the housing further comprises a printed circuit board on which the sensor is affixed, and
wherein a main board of the printed circuit board is positioned a distance of about 2.5 millimeters from the housing interface.
13 . The nasal spray device of claim 1 ,
wherein the sensor is further configured to detect presence of the vial in the chamber,
wherein the sensor is further configured for automatic calibration in response to insertion of the vial into the chamber.
14 . The nasal spray device of claim 1 ,
wherein the sensor comprises an infrared (IR) proximity sensor configured to sense a change in IR reflectivity from the graphical image upon movement of the nozzle in relation to the housing, and
wherein the sensor comprises a wide angle IR light emitting diode (LED).
15 . The nasal spray device of claim 14 , wherein the graphical image comprises laser printed ink on paper and/or polyvinyl chloride on plastic.
16 . The nasal spray device of claim 14 , wherein the IR proximity sensor is configured to sense presence of the vial in the chamber by distance sensing.
17 . The nasal spray device of claim 1 , wherein the sensor comprises a visible light sensor and a visible light source.
18 . The nasal spray device of claim 1 , wherein the sensor is configured to perform a line scan of the graphical image.
19 . A nasal spray device comprising:
a nozzle comprising a conical nozzle portion extending along a longitudinal axis and a housing interface configured to attach to a vial, the housing interface comprising a graphical image positioned on an exterior surface, the exterior surface being substantially cylindrical and concentric with the longitudinal axis; and
a housing comprising a chamber sized to receive the vial, an opening in communication with the chamber, and a sensor directed toward the graphical image and the longitudinal axis,
wherein the housing interface is positioned within the opening and configured to slide through the opening upon movement of the nozzle along the longitudinal axis in relation to the housing,
wherein the sensor is configured to detect movement of the graphical image positioned upon the exterior surface of the housing interface and determine a distance of depression of the nozzle upon movement of the nozzle along the longitudinal axis in relation to the housing.