US 12,357,220 B2
Insertable cardiac monitoring device designed for the MRI environment
Binh C. Tran, St. Paul, MN (US); Mitchell D. Lanz, Maple Grove, MN (US); and Scott R. Vanderlinde, Plymouth, MN (US)
Assigned to Cardiac Pacemakers, Inc., St. Paul, MN (US)
Filed by Cardiac Pacemakers, Inc., St. Paul, MN (US)
Filed on May 16, 2022, as Appl. No. 17/744,941.
Application 17/744,941 is a division of application No. 16/260,409, filed on Jan. 29, 2019, granted, now 11,357,440.
Claims priority of provisional application 62/625,092, filed on Feb. 1, 2018.
Prior Publication US 2022/0273225 A1, Sep. 1, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61N 1/37 (2006.01); A61B 5/00 (2006.01); A61B 5/283 (2021.01); A61B 5/361 (2021.01); A61B 5/363 (2021.01); A61N 1/05 (2006.01); A61B 5/055 (2006.01); A61N 1/08 (2006.01); A61N 1/39 (2006.01)
CPC A61B 5/361 (2021.01) [A61B 5/283 (2021.01); A61B 5/363 (2021.01); A61B 5/686 (2013.01); A61B 5/7282 (2013.01); A61N 1/0504 (2013.01); A61N 1/3718 (2013.01); A61B 5/055 (2013.01); A61B 5/6823 (2013.01); A61B 2560/0247 (2013.01); A61B 2562/0223 (2013.01); A61N 1/08 (2013.01); A61N 1/37 (2013.01); A61N 1/3956 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a magnetic field detection circuit;
a cardiac signal sensing circuit configured to generate a cardiac signal representative of cardiac activity of a subject;
a plurality of sensing of electrodes operatively coupled to the cardiac signal sensing circuit, wherein the electrodes are configured to be implanted subcutaneously;
a memory circuit; and
a control circuit operatively coupled to the magnetic field detection circuit, cardiac signal sensing circuit, and memory circuit, wherein the control circuit is configured to:
store cardiac signal data determined using the generated cardiac signal in the memory circuit;
receive an indication of magnetic field detection by the magnetic field detection circuit;
continue to monitor for the magnetic field detection;
identify first cardiac signal data obtained during a specified duration of time prior to the magnetic field detection; and
exclude from signal processing the first cardiac signal data obtained during a specified duration of time prior to the magnetic field detection and second cardiac signal data obtained during the magnetic field detection.