CPC A61B 5/02141 (2013.01) [A61B 5/0261 (2013.01); A61B 5/0295 (2013.01); A61B 5/02225 (2013.01); A61B 5/02416 (2013.01); A61B 5/6898 (2013.01); A61B 5/706 (2013.01); A61B 5/743 (2013.01); A61B 5/0077 (2013.01); A61B 5/02055 (2013.01); A61B 2560/0462 (2013.01); A61B 2562/0238 (2013.01); A61B 2562/0247 (2013.01)] | 21 Claims |
1. A mobile device, comprising:
a housing defining two opposing exterior surfaces, each of the opposing exterior surfaces being substantially planar;
a processor enclosed within the housing;
a display unit integrated into a first of the two opposing exterior surfaces;
a sensing unit integrated into the housing, wherein the sensing unit includes a reflectance-mode photoplethysmography (PPG) sensor configured to measure blood volume oscillations, and a force sensor disposed underneath the PPG sensor and configured to measure applied pressure;
a visual guide disposed on an exterior surface of the housing adjacent to the sensing unit, such that the visual guide is an indicia for placement of the fingertip on the device; and
a non-transitory computer-readable medium enclosed in the housing that stores instructions that, when executed by the processor, cause the processor to:
measure pressure applied to the sensing unit by a fingertip of a user,
measure blood volume oscillations in the fingertip,
guide the user via the display unit to vary pressure being applied to the sensing unit while the blood volume oscillations and pressure are measured,
generate an oscillogram from the measured pressure and the measured blood volume oscillations, where the oscillogram plots amplitude of blood volume oscillations as a function of the measured pressure,
calculate a blood pressure value from the oscillogram, and
present the blood pressure value on the display unit.
|