US 12,213,771 B2
Thermistor imbedded therapeutic catheter
Jerald Wayne Curran, North Andover, MA (US); Kiyotake Ishikawa, Fort Lee, NJ (US); and Roger J. Hajjar, Tenafly, NJ (US)
Assigned to Abiomed, Inc., Danvers, MA (US); and Icahn School of Medicine at Mount Sinai, New York, NY (US)
Filed by ABIOMED, Inc., Danvers, MA (US); and Icahn School of Medicine at Mount Sinai, New York, NY (US)
Filed on Feb. 16, 2022, as Appl. No. 17/673,255.
Application 17/673,255 is a continuation of application No. 15/927,273, filed on Mar. 21, 2018, granted, now 11,285,310.
Claims priority of provisional application 62/474,278, filed on Mar. 21, 2017.
Prior Publication US 2022/0273935 A1, Sep. 1, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 60/585 (2021.01); A61B 5/00 (2006.01); A61B 5/02 (2006.01); A61B 5/021 (2006.01); A61B 5/0215 (2006.01); A61B 5/028 (2006.01); A61B 5/029 (2006.01); A61M 60/13 (2021.01); A61M 60/135 (2021.01); A61M 60/148 (2021.01); A61M 60/205 (2021.01); A61M 60/216 (2021.01); A61M 60/50 (2021.01); A61M 60/515 (2021.01); A61M 60/531 (2021.01); A61M 60/538 (2021.01); A61M 60/816 (2021.01); A61M 60/00 (2021.01)
CPC A61B 5/029 (2013.01) [A61B 5/02028 (2013.01); A61B 5/02141 (2013.01); A61B 5/0215 (2013.01); A61B 5/028 (2013.01); A61B 5/6852 (2013.01); A61M 60/13 (2021.01); A61M 60/135 (2021.01); A61M 60/148 (2021.01); A61M 60/205 (2021.01); A61M 60/216 (2021.01); A61M 60/50 (2021.01); A61M 60/515 (2021.01); A61M 60/531 (2021.01); A61M 60/538 (2021.01); A61M 60/585 (2021.01); A61M 60/816 (2021.01); A61M 60/00 (2021.01)] 20 Claims
OG exemplary drawing
 
1. A system for measuring performance of a beating heart of a patient, comprising:
an intracardiac blood pump having a cannula with proximal and distal openings, a surface disposed between the proximal and distal openings and being configured to be positioned in an aorta of a patient;
an electrically driven motor and an electrical line configured to supply current to the motor to cause the intracardiac blood pump to pump blood through the cannula when the intracardiac blood pump is positioned in the aorta of the patient;
a catheter having proximal and distal end regions, the distal end region being connected to the cannula;
a thermistor that is configured to detect blood temperature of the blood flowing in the heart's ascending aorta when the intracardiac blood pump is positioned in the aorta of the patient;
a first sensor configured to detect changes in the motor current during operation of the intracardiac blood pump;
a second sensor configured to detect blood pressure within the ascending aorta when the intracardiac blood pump is positioned in the aorta of the patient; and
a processor configured to:
receive a first signal from the first sensor, the first signal being indicative of a change in the motor current, receive a second signal from the second sensor, the second signal being indicative of the blood pressure within the ascending aorta, and receive a third signal from the thermistor indicative of a temperature of blood flowing in the heart's ascending aorta,
calculate a pump flow output based on the first signal and the second signal, wherein the pump flow output is indicative of a cardiac assistance provided by the intracardiac blood pump;
calculate a total cardiac output based on the third signal, wherein the total cardiac output comprises (a) the cardiac assistance provided by the intracardiac blood pump and (b) a native cardiac output of the beating heart, and
calculate the native cardiac output of the beating heart based on the pump flow output and the total cardiac output.