US 11,744,476 B2
Blood pressure measurement using device with piezoelectric sensor
Wegene H. Tadele, San Francisco, CA (US); Makiko K. Brzezinski, San Jose, CA (US); Riley E. Brandt, Menlo Park, CA (US); and Siddharth Nangia, San Francisco, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Aug. 20, 2020, as Appl. No. 16/998,902.
Prior Publication US 2022/0054020 A1, Feb. 24, 2022
Int. Cl. A61B 5/025 (2006.01); A61B 5/022 (2006.01); A61B 5/021 (2006.01); A61B 5/00 (2006.01); A61B 5/024 (2006.01)
CPC A61B 5/025 (2013.01) [A61B 5/02108 (2013.01); A61B 5/02141 (2013.01); A61B 5/02225 (2013.01); A61B 5/02233 (2013.01); A61B 5/02405 (2013.01); A61B 5/7225 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A blood pressure measurement device comprising:
a cuff configured to extend around an arm of a user, the cuff comprising an inflatable bladder;
a pump;
a piezoelectric sensor coupled to the cuff;
a capacitive sensor coupled to the inflatable bladder; and
a processing unit operably coupled to the piezoelectric sensor and the capacitive sensor, the processing unit configured to;
determine, at least in part based on a signal generated by the capacitive sensor, that the blood pressure measurement device is in an on-arm state;
in response to determining the blood pressure measurement device is in the on-arm state, cause the pump to inflate the inflatable bladder; and
after the inflatable bladder is inflated to occlude a blood vessel of the user, while the bladder is deflating, and based at least in part on a signal generated by the piezoelectric sensor and responsive to blood flow in the arm of the user, determine a blood pressure of the user.