US 12,251,204 B2
Blood pressure monitoring system including a liquid filled sensor
Caleb C. Han, San Jose, CA (US); Patrick E. O'Brien, Pleasanton, CA (US); and Tongbi T. Jiang, Santa Clara, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Feb. 3, 2021, as Appl. No. 17/166,914.
Prior Publication US 2022/0240803 A1, Aug. 4, 2022
Int. Cl. A61B 5/022 (2006.01); A61B 5/00 (2006.01); A61B 5/318 (2021.01)
CPC A61B 5/02233 (2013.01) [A61B 5/318 (2021.01); A61B 5/681 (2013.01); A61B 2560/0214 (2013.01); A61B 2560/0257 (2013.01); A61B 2562/0247 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A blood pressure measurement device, comprising:
a strap configured to extend around a first portion of a limb of a user;
a pressure sensing stack configured to extend along a second portion of the limb of the user, the pressure sensing stack comprising:
an air pump defining a base of the pressure sensing stack and having a rigid housing defining a surface facing the user, the air pump coupled to the strap and configured to be secured to a user by the strap;
an inflatable chamber positioned on the surface of the air pump, fluidly coupled to the air pump, and having a first outer profile that is within a profile of the rigid housing, the inflatable chamber configured to:
be positioned on the rigid housing between the air pump and the user when the blood pressure measurement device is secured to the user; and
expand towards the user when inflated; and
a pressure sensing mechanism comprising:
a sealed chamber containing a volume of liquid, the sealed chamber coupled to the inflatable chamber, positioned between the inflatable chamber and the user when the blood pressure measurement device is worn by the user, and having a second outer profile that is within the profile of the rigid housing; and
a pressure sensing device positioned within the sealed chamber and configured to detect a pressure of the liquid volume.