Application US20190231261

Blood pressure measuring smartglasses
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US20190231261

1. A system configured to calculate blood pressure, comprising: (7) (3)

an inward-facing head-mounted camera (HCAM₁) configured to capture images of a first region of interest (IM_ROI1) that comprises a portion of exposed skin of the user's face;

an outward-facing head-mounted camera (HCAM₂) configured to capture images of a second region of interest (IM_ROI2) that comprises exposed skin on a hand of the user; and

a computer configured to calculate a blood pressure value for the user based on first and second photoplethysmographic signals (iPPG₁, iPPG₂) recognizable in IM_ROI1and IM_ROI2, respectively.

2. The system of claim 1, wherein the first region comprises a portion of one or more of the following body parts of the user: the neck, a jaw, a cheek, a maxillary process, the nose, a temple, and the forehead; and wherein the second region of interest comprises a portion of exposed skin located between the wrist and the fingertips. (0)

3. The system of claim 1, wherein iPPG₁and iPPG₂are indicative of pulse arrival times at the first and second regions of interest, respectively; and wherein the computer is further configured to extract iPPG₁and iPPG₂from IM_ROI1and IM_ROI2, respectively, and to calculate the blood pressure value based on a magnitude of a difference in the pulse arrival times at the first and second regions of interest. (1) (0)

5. The system of claim 1, wherein the blood pressure value is indicative of one or more of the following values: the systolic blood pressure of the user, the diastolic blood pressure of the user, and the mean arterial pressure of the user. (0)

6. The system of claim 1, wherein the center of the first region is located more than 40 cm away from the center of the second region, when the hand is stretched to the side; (0) (1)

7. The system of claim 1, wherein HCAM₁is a video camera, and HCAM₁does not occlude the first region of interest. (0)

8. The system of claim 1, wherein HCAM₁is an angle-sensitive pixel sensor camera, weighing less than 1 g. (0)

9. The system of claim 1, wherein the computer is further configured to generate feature values based on data comprising IM_ROI1and IM_ROI2, and to utilize a model to calculate the blood pressure value based on the feature values; wherein the model was trained based on training data comprising: previously taken IM_ROI1and IM_ROI2, and blood pressure values measured at times corresponding to the previously taken IM_ROI1and IM_ROI2. (9) (0)

10. The system of claim 9, wherein iPPG₁and iPPG₂are indicative of pulse arrival times at the first and second regions of interest, respectively; wherein the computer is further configured to extract iPPG₁and iPPG₂from IM_ROI1and IM_ROI2, respectively; and wherein the feature values comprise a value that is indicative of a difference between when a pulse wave manifested in IM_ROI1and IM_ROI2. (0)

11. The system of claim 9, wherein iPPG₁and iPPG₂are indicative of pulse arrival times at the first and second regions of interest, respectively; wherein the computer is further configured to extract iPPG₁and iPPG₂from IM_ROI1and IM_ROI2, respectively; and wherein the feature values comprise one or more values that are indicative of: (i) a certain blood pressure value of the user that was measured during a certain previous period, and (ii) a difference between when pulse waves of the user manifested in IM_ROI1and IM_ROI2taken during the certain previous period. (0)

12. The system of claim 9, wherein the previously taken IM_ROI1and IM_ROI2comprise images of body parts of the user, and the blood pressure values corresponding to the previously taken IM_ROI1and IM_ROI2, are blood pressure values of the user measured using a device that does not utilize HCAM₁and HCAM₂. (0)

13. The system of claim 9, wherein the computer is further configured to: receive a value indicative of a stress level of the user, and generate at least one of the feature values based on the received value. (1) (0)

15. The system of claim 9, wherein the computer is further configured to: receive a value indicative of a hydration level of the user, and generate at least one of the feature values based on the received value. (1) (0)

17. The system of claim 9, wherein the computer is further configured to: receive a value indicative of a temperature of the user's body, and generate at least one of the feature values based on the received value. (0)

18. The system of claim 9, wherein the computer is further configured to: receive a value indicative of a movement of the user's body, and generate at least one of the feature values based on the received value. (0)

19. The system of claim 9, wherein the computer is further configured to: receive a value indicative of an orientation of the user's head, and generate at least one of the feature values based on the received value. (0)

20. The system of claim 9, wherein the computer is further configured to: receive a value indicative of consumption of a substance by the user, and generate at least one of the feature values based on the received value; and wherein the substance comprises one or more of the following: a vasodilator, a vasoconstrictor. (0)

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Application US20190231261

Blood pressure measuring smartglasses

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