US 10,376,162 B2
Cardiovascular assist system that quantifies heart function and facilitates heart recovery
Elazer Edelman, Brookline, MA (US); Brian Chang, San Juan Capistrano, CA (US); Noam Joesphy, Danvers, MA (US); and Sonya Sanat Bhavsar, Danvers, MA (US)
Assigned to ABIOMED, INC., Danvers, MA (US); and MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Cambridge, MA (US)
Filed by Abiomed, Inc., Danvers, MA (US); and Massachusetts Institute of Technology, Cambridge, MA (US)
Filed on Sep. 19, 2017, as Appl. No. 15/709,080.
Claims priority of provisional application 62/396,628, filed on Sep. 19, 2016.
Prior Publication US 2018/0078159 A1, Mar. 22, 2018
Int. Cl. A61B 5/021 (2006.01); A61B 5/02 (2006.01); A61B 5/0215 (2006.01); A61N 1/362 (2006.01); A61M 1/10 (2006.01); A61M 1/12 (2006.01); A61B 5/0205 (2006.01); A61B 5/029 (2006.01); A61B 5/0456 (2006.01); A61B 5/00 (2006.01); A61B 5/024 (2006.01); A61B 5/026 (2006.01)
CPC A61B 5/02141 (2013.01) [A61B 5/0205 (2013.01); A61B 5/029 (2013.01); A61B 5/0215 (2013.01); A61B 5/02028 (2013.01); A61B 5/02158 (2013.01); A61B 5/0456 (2013.01); A61B 5/4848 (2013.01); A61B 5/7275 (2013.01); A61M 1/1086 (2013.01); A61M 1/125 (2014.02); A61B 5/026 (2013.01); A61B 5/02405 (2013.01); A61B 2505/09 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A heart pump system comprising:
a catheter;
a motor;
a rotor operatively coupled to the motor; and
a pump housing at least partially surrounding the rotor so that actuating the motor drives the rotor and pumps blood through the pump housing;
a sensor configured to detect a hemodynamic parameter over time; and
a controller configured to:
detect over time a motor parameter associated with the motor,
receive an input from the sensor of the detected hemodynamic parameter over time,
determine a relationship between the detected hemodynamic parameter and the detected motor parameter,
characterize the relationship between the hemodynamic parameter and the motor parameter using a polynomial best fit algorithm,
store the determined relationship in a memory,
determine a cardiac cycle phase from the relationship between the hemodynamic parameter and the motor parameter,
obtain a hysteresis curve based on the relationship between the hemodynamic parameter and the motor parameter, and
select a sample time on the hysteresis curve corresponding to the cardiac cycle phase.