US 11,903,683 B2
Non-barometric determination of hemodynamic effects of cardiac arrhythmias using signals sensed by an implantable device
Jie Cheng, Houston, TX (US); and Dhanunjaya Lakkireddy, Houston, TX (US)
Assigned to CHELAK MEDICAL SOLUTIONS INC, Houston, TX (US)
Filed by Chelak Medical Solutions Inc, Houston, TX (US)
Filed on Aug. 5, 2019, as Appl. No. 16/532,112.
Claims priority of provisional application 62/714,217, filed on Aug. 3, 2018.
Prior Publication US 2020/0037895 A1, Feb. 6, 2020
Int. Cl. A61B 5/00 (2006.01); A61B 5/0205 (2006.01); A61B 5/02 (2006.01); A61B 8/08 (2006.01); A61N 1/39 (2006.01); A61B 8/12 (2006.01); A61B 5/287 (2021.01); A61B 5/349 (2021.01); A61B 5/0215 (2006.01)
CPC A61B 5/02055 (2013.01) [A61B 5/0084 (2013.01); A61B 5/02028 (2013.01); A61B 5/287 (2021.01); A61B 5/349 (2021.01); A61B 5/686 (2013.01); A61B 5/6869 (2013.01); A61B 8/0883 (2013.01); A61B 8/12 (2013.01); A61N 1/3956 (2013.01); A61B 5/02154 (2013.01)] 39 Claims
OG exemplary drawing
 
1. A method for determining hemodynamic stability of a subject, comprising:
transmitting an optical signal via at least one optical fiber disposed in a heart of the subject, wherein the at least one optical fiber includes at least one fiber Bragg grating (FBG) and is configured to bend with contraction and relaxation of the heart;
receiving a reflected portion of the optical signal via the at least one optical fiber;
analyzing bending of the at least one optical fiber based on a change in at least one parameter of the received reflected portion of the optical signal, wherein the at least one parameter change includes a Bragg wavelength shift, and wherein the Bragg wavelength shift is indicative of an amount of bending of the at least one optical fiber due to contraction and relaxation of the heart; and
determining the hemodynamic stability of the subject based on the Bragg wavelength shift.